CA2491933A1

CA2491933A1 - Use of metal complexes containing perfluoroalkyl as contrast agents in magnetic resonance imaging for representing intravascular thrombi

Info

Publication number: CA2491933A1
Application number: CA002491933A
Authority: CA
Inventors: Bernd Misselwitz; Johannes Platzek; Yoko Kawata; Hanns-Joachim Weinmann; Takashi Yokawa; Ulrich Niedballa
Original assignee: Individual
Current assignee: Bayer Pharma AG
Priority date: 2002-07-10
Filing date: 2003-07-05
Publication date: 2004-01-22
Also published as: WO2004006965A2; TW200413008A; NO20050679L; UA79294C2; AR041187A1; IL165889A0; PT1519756E; ES2285143T3; RU2005103598A; DE10231799A1; DE10231799B4; RS20050020A; MXPA04012950A; AU2003281150A1; DK1519756T3; ZA200501172B; WO2004006979A2; JP2005532404A; EP1519756B1; PE20040656A1

Abstract

The invention relates to the use of metal complexes containing perfluoroalkyl as contrast agents in MR imaging for representing intravascular thrombi. Said complexes have a critical micelle-formation concentration < 10-3 mol/l, a hydrodynamic micelle diameter (2 Rh) > 1 nm and a proton relaxivity in plasma (R1) > 10 l/mmol.s.

Description

Use of PerJluoroalkyl Containing Metal Complexes as Contrast Media in MR-Imaging for Visualization of Intravascular Thrombi The invention relates to the subject that is characterized in the claims, i.e., the use of perfluoroalkyl-containing metal complexes that have a critical micelle formation concentration < 10-3 moll, a hydrodynamic micelle diameter (2 Rh) > 1 nm, and a proton relaxivity in plasma (R~) > 101/mmol~s, as contrast media in MR-imaging for visualization of intravascular thrombi.
Thrombosis is defined as the formation of a blood clot (thrombus) in a blood vessel and the thus-induced constriction or clogging of this vessel. Most often, thromboses are found in the veins (phlebothrombosis). Here, preferably the veins of the lower half of the body (deep femoral and pelvic veins) are affected. Other portions of the circulatory system can also be affected, however: heart valves, apexei of the heart, coronary vessels, cerebral vessels, arteries in the area of the intestines, femoral arteries as well as veins of the leg and the pelvis, the rectum (hermorrhoids) and the arni. By moving the thrombus, a pulmonary embolism can result, which in the worst case ends in death.
Thromboses of the deep primary veins represent a significant social-medical problem. In Germany, 60,000 humans per year are treated for thromboses and their consecutive symptoms.
In the USA, an acute thrombosis of the deep femoral veins of the leg and the pelvis occurs yearly in 48 out of a population of 100,000. About 12% of all stationary patients develop clinically detected deep femoral or pelvic vein thromboses. About 20 to 30% of all general-surgery patients and more than SO% of all patients after orthopedic/emergency surgical intervention suffer deep femoral vein thromboses, whereby in about 1 % of these patients, a lung embolism with clinical symptoms occurs (Leitlinien zu Diagnostik and Therapie in der Gefa[3chirurgie [Guidelines in Diagnosis and Therapy in Vascular Surgery], published by the Board of Directors of Dt. Ges. f. Gefa(3chirurgie; Deutscher Arzteverlag [German Society for Vascular Surgery; ' German Physicians' Publishing House], Cologne 1998).

2 The decisive mechanisms that cause a thrombosis were already described in 1856 by Rudolf Virchow and named by him as Virchow'sTriad. In this case, this is damage to the vascular wall, slowing of the blood flow and an elevated blood-clotting tendency because of a change in the blood composition. While for the venous thrombosis (phlebothrombosis), the slowing of the blood flow and an elevated clotting tendency are emphasized, damage to the vascular wall, in most cases as a result of arteriosclerosis, with the deposit of blood platelets (thrombocytes) is of decisive importance in the development of the rare arterial thrombosis.
The thrombus maintains its original form only for a few days. After a structural transformation, it can be transformed as a scar in its final state, and the vessel is partially passable again (rechanneled). The purpose of the therapy is primarily the restoration of the blood flow. This therapy depends on the age of the thrombus and is successful only within the first 10 days after the thrombus develops. The restoration of the blood flow can be carned out, on the one hand, by a medicinal dissolution of the thrombus (thrombolysis). On the other hand, surgical methods are available: either the removal of the occlusion by removal of the clot (thrombectomy) or the bridging of the occluded vascular segment by an angioplasty (bypass). In the second place, the object of the therapy of the thrombosis is to prevent additional growth of the thrombus and to avoid late sequelae or complications.
The diagnosis of thromboses in clinical practice is mainly carned out by imaging processes. A very suitable method for detecting a thrombosis as well as for determining its extent is the radiological contrast medium study (phlebography). Drawbacks are the exposure to ionizing rays and the side effects that are associated with iodine-containing contrast media. The initial examination method in the suspicion of low femoral vein thrombosis in many clinical devices is therefore the color-coded duplex sonography (B-scan plus PW
Doppler), which is extremely dependent on the examiner, however. Other non-invasive imaging processes for visualizing luminal vascular changes are arteriography, CT angiography and MR
angiography, as well as methods of nuclear medicine.
Thrombi thus can be visualized by blood corpuscles that are labeled with indium-111 as

3 imaging agents (Thakur et al., Thromb. Res. 9: 345, 1976; Powers et al., Neurology 32: 938, 1982). The iodine isotopes J-125 and J-131 are also suitable for imaging purposes (Pang, US
5,011,686, 1991). The technetium isotope Tc-99m is widely used as a label.
Peptides and especially monoclonal antibodies are labeled with it (Bergen US 5,024,829, 1991; Dean et al., US 4,980,148, 1990: US 5,508,020, 1996; US 5,645,815, 1997; WO 00/61195; US
6,171,578, 2001; EP 1171166, 2002). Compounds that are suitable both for scintigraphy and for MR
imaging are described by Abelman (US 5,656,600, 1997). In WO 01 /77102, DuPont Pharmaceuticals describes conjugates from metal complexes and pyridinones, which are suitable as contrast media for diagnosis of thromboses with the aid of scintigraphy, computer tomography or MR imaging.
The literature for MR angiography for visualizing intravascular thrombi has a broad scope. Application WO 95/09013 describes cytogene polypeptides as complexing agents for paramagnetic metal ions.
In Application WO 95/24225, Nycomed named polymer complexing agents for thrombus imaging. Complexing agents such as DOTA or D03A are bonded to a backbone - for example, polylysine.
In WO 95/20603, Sandoz describes paramagnetic DTPA conjugates, which are suitable for the thrombus imaging.
In the Barne-Jewish Hospital Patent US 5,780,010, specifically binding (biotin-avidin complex) conjugates are described as contrast media for thrombus imaging.
Also, in WO
98/16256, the Burnham Institute describes radicals that specifically bind (to integrin) and that make possible a thrombus imaging. In these conjugates, paramagnetic complexes of DTPA, EDTA or DOTA are contained as signaling radicals.
Conjugates that consist of a guanidine derivative and paramagnetic complexes are described by 3-Dimensional Pharmaceuticals as contrast media for the thrombus imaging in WO
01 /04117.
Conjugates that consist of complexes of DTPA, DOTA or D03A and polypeptides are

4 described by EPIX in WO 01/09188 and EP 1203026 as imaging agents for the thrombus imaging.
In EP 885545, Pilgrimm names superparamagnetic iron oxides as contrast media for thrombosis diagnosis with the aid of MRI.
The MR contrast medium that is described in WO 02/22011 for the diagnosis of thrombi is also particulate (USPIO).
It is disadvantageous in the case of the conjugates that in addition to the diagnostically active portion, they contain another component (peptide or pharmaceutical agent), such that side effects, such as, for example, reduced compatibility, occur more often.
Of the particulate contrast media, the thrombus visualization of EP 885545 is described but not confirmed by experiment.
In WO 02/22011, images are shown, but the latter are obtained according to T2*-weighted flash sequences, such that the thrombi are only signal-free after the administration of contrast medium.
The examination of the blood of the patient for the presence of an elevated concentration of D-dimers has recently gained considerable clinical importance. According to associated studies, a concentration of less than 500 ~g/1 of D-dimers in the blood rules out the presence of a thromboembolism with very high probability (Wells, P. S. Brill-Edwards, P., Stevens, P. et al. A
Novel and Rapid Whole Blood Assay for D-Dimer in Patients with Clinical Suspected Deep Vein Thrombosis. Circulation 1995; 91: 2184-2187). The specificity of the D-dimer detection is low, however, such that a thrombosis cannot be deduced from an increase of the concentration in the blood.
Obtaining images with the aid of nuclear magnetic resonance (MRI) is a modern, non-invasive radiological process, which makes possible the visualization of physiological and pathophysiological structures with a very good space and time resolution. In the diagnosis of deep femoral and pelvic vein thrombosis, the MR venography (MRV) has been methodically established for quite a long time as an alternative to phlebography and color-coded Doppler sonography (FKDS) in the area of the suprapopliteal veins. In recent years, studies on the MRV
of the deep femoral veins were also published.
From the data record of a contrast-enhanced 3D-MR-angriography, the venous system basically can be selectively visualized by perfusion phase subtraction and directly visualized via an instep vein after injection of a dilute paramagnetic contrast medium. In the case of MR
angiography with conventional, extracellular, paramagnetic substances, a homogeneous vascular contrast is not always achieved, which impedes an evaluation in individual cases. With the expected use of highly concentrated contrast media or so-called "blood pool agents," however, the faster, contrast medium-supported 3D-MRA could be advantageous. With T2-turbo-spinecho (TSE) and Time-of Flight (TOF)-sequences (without contrast medium), an adequate signal level can also be achieved in the open lower field tomograph (Konig, C. et al., MR-Venographie am offenen Niederfeldtomographen unter Verwendung manueller Flussaugmentation [MR
Venography in the Open Lower-Field Tomograph with Use of Manual Flow Augmentation];
Rofo, Fortschr. Geb. Rontgenstr. Neuen Bildgeb. Verfahr. 2001; 173: 810-814).
Flow-sensitive MRA techniques, however, are less suitable for the diagnosis of thromboses, since in veins, especially in those with a thrombosis, the flow rate in the non-thrombosed portion is often too low.
The use of specific contrast media with selective concentration in certain tissues and organs could increase the diagnostic value of the MR imaging considerably.
Contrast medium preparations with selective concentration in intravascular thrombi were able to detect location and degree of the disease at an early time and thus to make possible a targeted therapy and prophylaxis.
In addition, there is therefore a need for a compatible, powerful contrast medium for visualizing arterial and venous thromboses.
The object of this invention was therefore to make available contrast media for the visualization of intravascular thrombi in MR imaging that meet the requirements for Selective concentration High compatibility Strong enhancement Complete elimination and good water solubility.
It has now been found, surprisingly enough, that perfluoroalkyl-containing metal complexes, which have a critical micelle formation concentration < 103 mol/1, a hydrodynamic micelle diameter (2 Rh > 1 nm) and a proton relaxivity in plasma (R~) >
101/mmol~s, are very well suited as contrast media in MR imaging for visualizing intravascular thrombi.
Compounds with these properties were already described in WO 02/13874 as diagnostic agents for plaque imaging with the aid of MR technology.
The MR images clearly show, however, that plaques and thrombi can be distinguished clearly from one another. This is therefore important, since thrombi in the young stage can be mobile and can result in lethal embolisms.
For the following tests, the gadolinium complexes were used, since the gadolinium of all paramagnetic ions has the greatest influence on the signal amplification in the MRI.
In an in-vitro test (binding to a fibrin gel), it was possible to prove that the compounds according to the invention bind to the fibrin gel at a concentration of 0.01 mmol of Gd/I to 79%
and at a concentration of 0.1 mmol of Gd/I to 39% and thus make possible a reliable differentiation from plaque.
In addition, the contrast behavior of the compounds according to the invention was also examined in vivo. In rabbits with photochemically induced thrombus (PIT; i.v.
injection of rose-Bengal and irradiation with xenon light), a considerable enhancement in the induced thrombus could be observed at various times after intravenous administration of 0.1 mmol of Gd/kg of body weight of the compound according to the invention (2 to 48 hours p.i.) with T1-weighted sequences. At the time of 24 hours p.i., the gadolinium concentration in the thrombus was about 4 x higher compared to the blood.
For the MRI imaging, gadolinium concentrations of at least 50 p.mo/1 and at most 2500 ~mol/1 are required in the thrombus, where the concentration of the compound is carried out.
The imaging can be done after 15 minutes or up to 48 hours after injection of the compounds according to the invention. Since primarily the TI-relaxation times of the tissue are influenced with the gadolinium complexes according to the invention, TI-weighted sequences are best able to detect an enhancement in the thrombus.
Amphiphilic compounds that as a nonpolar portion have a perfluoroalkyl side chain in the molecule that is optionally connected via a lipophilic linker with the total molecule are defined as perfluoroalkyl-containing metal complexes that are suitable for use according to the invention.
The polar portion of the compounds according to the invention is fonmed by one or more metal complexes and optionally present additional polar groups.
In aqueous systems, these amphiphilic molecules show the properties that are characteristic of standard surfactants (such as, e.g., sodium dodecylsulfate, SDS). They thus reduce the surface tension of water. By tensiometry, the so-called CMC
(critical micelle formation concentration in mol/1) can be determined. In this respect, the surface tension is determined based on the concentration of the substance to be measured. The CMC
can be calculated from the plot of the surface tension function (c) that is obtained.
The critical micelle formation concentration of the compounds according to the invention must be <
I 0-3 mol/1, preferably < 10~ mol/1.
The amphiphilic compounds according to the invention are associated in solution and are present as aggregates. The size (2 Rh) of such aggregates (e.g., micelles, rods, wafers, etc.) can be determined with the aid of photon-correction spectroscopy (PCS).
As a second criterion, the hydrodynamic micelle diameter 2 Rh, which must be >
1 nm, is therefore used. In particular, those perfluoroalkyl-containing metal complexes according to the invention whose 2 RH >_ 3 nm, quite especially preferably > 4 nm, are suitable.
Both the determination of the CMC and the photon correlation spectroscopy are described in H.-D. Dorfler, "Grenzflachen- and Kolloidchemie [Interface and Colloid Chemistry],"
Weinheim, New York, Basel, Cambridge, Tokyo, VSH 1994.

As a third criterion, the proton-relaxivity in plasma (R') at 40°C and a field strength of 0.47 tesla are used. The relaxivity, which is indicated in [l/mmol~s], is the quantitative measurement for the shortening of relaxation time T' of the protons. For the purpose according to the invention, the relaxivity must be as high as possible and > 10 I/mmol~s, preferably > 13 1/mmol~s, especially preferably > 151/mmol~s.
Relaxivity R' [l/mmol~s] of the MR-contrast media according to the invention was determined with the Minispec P 20 device of the Bruker Company. The measurements were taken at 40°C and a field strength of 0.47 tesla. Eight measuring points were recorded by each T 1-sequence: 180°-TI-90°, inversion recovery. As a medium, bovine plasma of the Kraeber Company was used. The contrast medium concentrations [mmol/I] in the batches were between 0.30 and 1.16.
In an embodiment of this invention, the compounds of general formula I
according to claims 8 to 11 are used as preferred compounds. In this case, these are known compounds that are described in WO 97/267017. Their production can also be found in this WO
publication.
Surprisingly enough, it has been shown that these compounds are also very well suited as MRI-contrast media for visualization of thrombi. As quite especially preferred compounds, metal complexes MK 2, 3 and 4, as well as MK 8, 9, 10 and 11 (cf. also Table 1 ) are used.
In another embodiment of this invention, those compounds of general formula Ia according to claims 12 to 21 are used as preferred compounds. These compounds are known and are described in WO 99/01161. Their use as MRI contrast media for visualization of thrombi still had not been described to date. Of these compounds, quite especially preferably metal complex MK 12 (cf. Table 1) is used.
In another preferred embodiment of the invention, the macrocyclic perfluroalkyl compounds of general formula Ib ~,, K-~---L'-RR (Ib) in which K means a complexing agent or a metal complex of general formula IIb (Ilb) whereby R' stands for a hydrogen atom or a metal ion equivalent of atomic numbers 23-29, 42-46 or 58-70, R2 and R3 stand for a hydrogen atom, a C,-C~ alkyl group, a benzyl group, a phenyl group, -CH20H or -CHZ-OCH3, and UZ stands for radical L', whereby L' and U2, independently of one another, can be the same or different, A' means a hydrogen atom, a straight-chain or branched C,-C3o alkyl group, which optionally is interrupted by 1-1 S oxygen atoms, and/or optionally is substituted with 1-10 hydroxy groups, 1-2 COOH groups; a phenyl group, a benzyl group and/or 1-5 -OR9 groups, with R9 in the meaning of a hydrogen atom or a C,-C~
alkyl radical, or -L'-RF, L' means a straight-chain or branched C,-C3o-alkylene group, which optionally is interrupted by 1-10 oxygen atoms, 1-S -NH-CO groups, 1-5 -CO-NH groups, by a phenylene group optionally substituted by a COOH group, 1-3 sulfur atoms, 1-2 -N(B')-S02 groups and/or 1-2 -S02-N(B') groups with B' in the meaning of A', an NHCO group, a CONH group, an N(B')-SOZ group or an -SOZ-N(B') group andlor optionally is substituted with radical RF, and RF means a straight-chain or branched perfluorinated alkyl radical of formula C"FZnE, whereby n stands for numbers 4-30, and E stands for a terminal fluorine atom, chlorine atom, bromine atom, iodine atom or a hydrogen atom, and optionally present acid groups optionally can be present as salts of organic and/or inorganic bases or amino acids or amino acid amides, as they and their production are disclosed and defined in WO 02/13874, can be used.
According to the invention, metal complexes MK 17, MK I 8, MK 19, MK 21, and MK
23 (cf. Table 1 ) are quite especially preferably used.
These compounds of general formula Ib are very well suited as MRI contrast media for visualizing thrombi.
In another preferred embodiment of the invention, the perfluoroalkyl-containing complexes with sugar radicals of general formula Ic (see WO 02/13874) (K~~_G _ ~Z_RF~n~
(Ic) ~~R~, in which R represents a mono- or oligosaccharide radical bonded by the 1-OH- or 1-SH-position, RF is a perfluorinated, straight-chain or branched carbon chain with the formula -C"F2"E, in which E represents a terminal fluorine; chlorine, bromine, iodine or hydrogen atom, and n stands for numbers 4-30, K stands for a metal complex of general formula IIc, ll COOR' ~,r ,/~'h! Ra f~ 0 f ~ ~1~U

R OOC
~, 0 COOK' (Ila) in which R~ means a hydrogen atom or a metal ion equivalent of atomic numbers 23-29, 42-or 58-70, provided that at least two R' stand for metal ion equivalents, R2 and R3, independently of one another, represent hydrogen, C,-C~ alkyl, benzyl, phenyl, -CH20H or -CH20CH3, and U represents -C6H4-O-CH2-c~, -(CHz)~_5-w, a phenylene group, -CH2-NHCO-CHz-CH(CHZCOOH)-C6H4-w, -C6H4-(OCHZCHz)o_1-N(CH2COOH)-CHZ-c~, or a C,-C,2 alkylene group or C~-C,2-C6H4-O group optionally interrupted by one or more oxygen atoms, 1 to 3 -NHCO groups or 1 to 3 -CONH groups and/or substituted with 1 to 3 -(CH2)o_5 COOH groups, whereby c~ stands for the binding site to -CO-, or of general formula IIIc DOOR' COOK
R'OOC''r / l!
~,N
COO R' tilic) in which R' has the above-mentioned meaning, R'° represents hydrogen or a metal ion equivalent mentioned under R~, and U' represents -C6H4-O-CH2-ca, whereby w means the binding site to -CO-, or of general formula IVc COOR' ~N R
R'OOC'N
N O
GoOR' ~iVc) in which R' and R2 have the above-mentioned meaning or of general formula VcA or VcB
N,.--~-Ca-~
''-Cad' R'ObC'~N
N~Ct)aR~
eaaR
c~~>
Nr-caoR' o ' ~-cooR~
,,~.-G~.,-- jN
~~~cooR~
COOK
N~) in which R~ has the above-mentioned meaning, or of general formula VIc R't7C7C---,~, ,r'--~ ,..-wC0-.,~.
R'000-~'~N N'~-~.~Ot7R' (Vlc) in which R' has the above-mentioned meaning, or of general formula VIII
R'OOC--~, O
R'OC?C---''°~ U' R'OOC--~,.,N
R'OOC--~
(1/f l~) in which R' has the above-mentioned meaning, and U~ represents -C6H4-O-CHZ-w, whereby w means the binding site to -CO-or of general formula VIIIc ~00!R' 'N
R'OOC'' N
s ~Ot7R ~ilillc) in which R' has the above-mentioned meaning, and in radical K, optionally present free acid groups optionally can be present as salts of organic and/or inorganic bases or amino acids or amino acid amides, G for the case that K means metal complexes IIc to VIII, represents a radical that is functionalized in at least three places and is selected from the following radicals a) to j) (a1 a ~~-~. (CHZ),~ ~---GO --~.,~ Y
NH
(a2~
H
a-~ H (CH~)d-C-C
NH

Y ~-~O-~-f~Hz~~ ~ ~- ~
NH
a fe) ac ~' N
v~,.- --,-"w,. Y
~N~
a f~) ~~) ',., ~.,~.--~ ~~...,. «
~1~-i-Ct~-~---~Gl-~~~ ~~«
N-~'Y
w -~U-C-~CH~a~ ~'~'w-oc filw NH
NH--CC-GH-(CH2); NH-~''~
N-CC~--~H--(CH2~~ NHw~~~''a NH
NH--CQ-~H-~GH2); NH-~~~' NH
a~.M..--~.-.iCH~,~~-C-~---CO.C,...,-(CH~~~-~--.-"~
(~H
Y
cx f~
(~.,-~-_-~CH~~~a C-C ~ N~-~wY
hi ~1H
a ac,~lv~-I_~CH -00-~nAY
and G for the case that K means metal complex VIIIc, represents a radical that is functionalized in at least three places and is selected from k) or 1), -NH---(~H~~;~ CH-GO-~''ac i~H
Y
a~-Cp~--CHI ~H~-~H~ CO-~'Y
f~H
whereby a means the binding site of G to complex K, ~ is the binding site of G
to radical Y, and y represents the binding site of G to radical Z, Y means -CH2, 8-(CH2),_SCO-Vii, ~i-(CH2),_SCO-8, 8-CHz-CHOH-CO-(3 or 8-CH(CHOH-CHZOH)-CHOH-CHOH-CO-(3, whereby 8 represents the binding site to sugar radical R, and ~ is the binding site to radical G, Z stands for ~ ~~ N-S0~
y-CaCH~-N(C~H3}-S(3~-s, y~CC3CH,~-C7-(CH~O~-s, a a ~ON.~~.N--S02 ~
or y - NHCHzCH2-O-CHZCHz-~
whereby y represents the binding site of Z to radical G, and ~ means the binding site of Z to perfluorinated radical RF
and 1', m', independently of one another, mean integer I or 2, and p' means integers 1 to 4, can be used.
As quite especially preferred compounds of general formula Ic, metal complex MK I 3 of Table I according to the invention is used.
In another preferred embodiment of the invention, the perfluoroalkyl-containing complexes with polar radicals of general formula Id (see WO 02/13874) are used (~~~~C~ RFlm~ (Id) t ~~~z in which RF is a perfluorinated, straight-chain or branched carbon chain with formula -C"FZ~E, in which E represents a terminal fluorine, chlorine, bromine, iodine or hydrogen atom, and n stands for numbers 4-30, K stands for a metal complex of general formula IId, COON' Ra O
i ~'~-u~
(Il~d) in which R' means a hydrogen atom or a metal ion equivalent of atomic numbers 23-29, 42-or 58-70, provided that at least two R' stand for metal ion equivalents, RZ and R3, independently of one another, represent hydrogen, C,-C~ alkyl, benzyl, phenyl, -CH20H or -CHZOCH3, and U represents -C6H4-O-CH2-w-, -(CHz),_5-c~, a phenylene group, -CH2-NHCO-CH2-CH(CHZCOOH)-C6H4-w-, -C6H4-(OCH2CH2)o_~-N(CHzCOOH)-CHZ-w, or a C,-C,2 alkylene group or C~-C~2-C6H4-O group optionally interrupted by one or more oxygen atoms, 1 to 3 -NHCO groups, 1 to 3 -CONH groups and/or substituted with 1 to 3 -(CH2)o-sCOOH groups, whereby w stands for the binding site to -CO-, or of general formula IIId C00 R' N ~ GOOR I
.,...~.,. ,.._-R'OOC'~~ ~ U
N
G~70R' (Ilid) in which R1 has the above-mentioned meaning, R4 represents hydrogen or a metal ion equivalent mentioned under R', and U' represents -C6H4-O-CH2-w-, whereby c~ means the binding site to -CO-, or of general formula IVd GOOK' R'QOC'' ~GC?4!;' (llfd~
in which R' and Rz have the above-mentioned meaning, or of general formula VdA or VdB
~N~C 0 R'OOC"'~, ~N~C0~0R~

~'ciA) Nr-Cta0l~' p ~ '~-COOK' ~-C~
N.r-CO UR' '~-CO OR' (~dB3 in which R' has the above-mentioned meaning, or of general formula VId R'OOC--~,.' f"~ ~,,---CO-..~,,~, R'OC~C--~''N ~'~,-.-C(7E.)R' (IIId~
in which R' has the above-mentioned meaning, or of general formula VIId R'O CSC-,-,~ ~0 R'UC7C-''N '~
R'C~OC-,~N
R'OOC-~' (Vlid) in which R~ has the above-mentioned meaning, and U ~ represents -C6H4-O-CHZ-c~-, whereby ca means the binding site to -CO-, and in radical K, optionally present free acid groups optionally can be present as salts of organic and/or inorganic bases or amino acids or amino acid amides, G represents a radical that is functionalized in at least three places and is selected from the following radicals a) to i) t~~ ?
NH
(a2) F
a~H (~H~~j4 C-CU-rwlr ~3 ~JH
I
Y
(~~
'Y ,n~..~CO-~-(~Hz)~ ~ w~- ~
~H
a (fib «,~»,...--~-~cH~~~-c-~-co-C--~cH~~~ H--~~
~o ~!H
ts) HM N NH
~f 1 Y wQ~to~x~a-~~"',w'~ . (i) ~ ~wV Co-(Cliz)xw ~r~co.",~r ~H
a a whereby a means the binding site of G to complex K, (3 is the binding site of G to radical R, and y represents the binding site of G to radical Z
Z stands for ~-hl ~ N-~~~ 8 r..G~O~Hzo~CHz~.
whereby y represents the binding site of Z to radical G, and ~ means the binding site of Z to perfluorinated radical RF, R represents a polar radical that is selected from complexes K of general formulas IId to VIId, whereby R' here means a hydrogen atom or a metal ion equivalent of atomic numbers 20, 23-29, 42-46 or 58-70, and radicals RZ, R3, R4, U and U' have the above-indicated meaning, or the folic acid radical or means a carbon chain with 2-30 C atoms that is bonded to radical G via -CO- or SOZ- or a direct bond, and is straight or branched, saturated or unsaturated, optionally interrupted by 1-10 oxygen atoms, 1-5 -NHCO groups, 1-

5 -CONH groups, 1-2 sulfur atoms, 1-5 -NH groups or 1-2 phenylene groups, which optionally can be substituted with 1-2 OH groups, 1-2 NH2 groups, 1-2 -COOH groups, or 1-2 -S03H groups, or optionally substituted with 1-8 OH groups, 1-5 -COOH groups, 1-2 S03H groups, 1-5 NH2 groups, or I-5 C,-C4 alkoxy groups, and 1', ml, p2, independently of one another, mean integer 1 or 2.
Especially preferred compounds of general formula Id are those with macrocyclic compound K of general fornmla IId, IIId, VdB or VIId.
Metal complex MK12 of Table 1 according to the invention is used as a quite especially preferred compound of general formula Id.
In another preferred embodiment of the invention, galenical formulations can be used that contain paramagnetic and diamagnetic perfluoroallkyl-containing substances.
The paramagnetic and diamagnetic substances are preferably present in a dissolved state in an aqueous solvent.
As paramagnetic, perfluoroalkyl-containing compounds, all above-mentioned metal complexes of general formulas I, Ia, Ib, Ic and/or Id according to the invention can be used in the formulations.
The diamagnetic perfluoroalkyl-containing substances are those of general formula XX
(see WO 02/13874):

RF_L2_B2 (XX) in which RF represents a straight-chain or branched perfluoroalkyl radical with 4 to 30 carbon atoms, LZ stands for a linker, and BZ stands for a hydrophilic group. Linker L2 is a direct bond, an -SOZ group, or a straight-chain or branched carbon chain with up to 20 carbon atoms, which can be substituted with one or more -OH, -COO, or -S03 groups and/or optionally contains one or more -O-, -S-, -CO-, -CONH-, -NHCO-, -CONR9-, -NR9C0-, -S02-, -P04-, -NH-or -NR9 groups, an aryl ring or a piperazine, whereby R9 stands for a C, to CZO alkyl radical, which in turn can contain one or more O atoms, and/or can be substituted with -COO- or S03 groups.
Other suitable diamagnetic perfluoroalkyl-containing compounds are conjugates that consist of cyclodextrin and perfluoroalkyl-containing compounds. These conjugates consist of a-, (3- or y-cyclodextrin and compounds of general formula XXII (see WO
02/13874) A ~ _L3_RF (XXII) in which A' stands for an adamantane, biphenyl or anthracene molecule, L3 stands for a linker, and RF stands for a straight-chain or branched perfluoroalkyl radical with 4 to 30 carbon atoms.
Linker L3 is a straight-chain hydrocarbon chain with 1 to 20 carbon atoms, which can be interrupted by one or more oxygen atoms, one or more CO-, S02-, CONH-, NHCO-, CONR-, NRCO-, NH- or NR groups or a piperazine, whereby R is a C,-CS alkyl radical.
In summary, it has been detemlined that as quite especially preferred compounds, gadolinium complexes MK I-30 that are presented in Table 1 meet the criteria according to the invention. The physical parameters of these metal complexes are presented in Table I .
Both the paramagnetic compounds of general formulas I, Ia, Ib, Ic and Id according to the invention and the formulations that consist of paramagnetic and diamagnetic perfluoroalkyl-containing substances according to the invention are extremely well suited as contrast media in MR-imaging for visualization of thrombi.

Table 1:
Metal Complexes (MIA that are Quite Especially Preferably Used According to the Invention, Their Origin and Their Physicochemical Parameters Com lex Ori in Exam le R' [l : CMC[mol/1] 2 Rh [nm]
No. mmol's]

MK 1 WO 99/0116118 23.0 1.5 10 3.5 MK 2 WO 97/260171 29.7 1.0 10-5 31.5 MK 3 WO 97/260172 33.0 2.3 10-5 14.0 MK 4 WO 97/260173 27.5 1.44 10-5 3.2 MK S WO 99/0116125 15.1 3.1 10- 7.0 MK 6 WO 97/2601731 26.0 9.8 10 4.3 MK 7 WO 99/0116112 21.4 1.81 10 4.2 MK 8 WO 97/2601733 35.7 1.86 ' 10- 4.6 MK 9 WO 97/2610735 34.0 3.25 ~ 10- 4.3 MK 10 WO 97/2601734 24.9 7.06 ' 10- 3.2 MK 11 WO 97/2601732 24.8 2.88 ' 10- 35.5 MK 12 WO 99/011611 19.5 8.9 ' 10 2.2 MK 13 WO 02/1387421 15.9 2.5 ' 10 4.4 MK 14 WO 02/1387454 21.3 3.9 10- 4.9 MK 15 WO 99/0116114 19.3 8.7 ~ 10- 3.2 MK 16 WO 00/567237 21.0 2.8 ' 10- 4.3 MK 17 WO 02/138746 13.3 2.65 ' 10- 6.0 MK 18 WO 02/138742 19.6 3.9 - 10~ 4.4 MK 19 WO 02/138745 30.3 5.2 ' 105 3.0 MK 20 WO 00/567234 21.9 4.6 10- 5.5 MK 21 WO 02/138743 21.2 2.92 10- 2.5 MK 22 WO 00/567237 27.8 4.4 ' 10 5.7 MK 23 WO 02/138741 25.7 7.9 ' 10- 5.4 MK 24 WO 99/011611 13.9 6.3 ' 10 10.0 MK 25 WO 99/011615 21.3 1.4 10 3.5 MK 26 WO 02/1387457 22.8 4.3 ' 10- 5.2 MK 27 WO 97/2501738 30.5 1.07 ' 10- 7.4 MK 28 This 1 27.9 8.1 ' 10~ 4.7 a lication MK 29 This 2 17.7 7.6 105 4.8 a lication MK 30 This 3 27.9 7.0 ~ 10- 7.9 a lication CMC: Critical Micelle Formation Concentration 2 Rh: Hydrodynamic Micelle Diameter R' : Relaxivity The measurements were carried out in plasma at 40°C and a field strength of 0.47 Tesla.
Example 1 a) 6-Benzyloxycarbonyl-2-N-2H,2H,4H,4H,SH,SH-3-oxa-perfluorotridecanoyl-L-lysine methyl ester 2 drops of dimethylformamide are added to the solution of SO g (95.8 mmol) of 2H,2H,4H,4H,SH,SH-3-oxaperfluorotridecanoic acid (produced from 2H,2H,3H,3H-perfluorodecanol and bromoacetic acid-t-butyl ester with subsequent ester cleavage) in 250 ml of thionyl chloride, and it is refluxed for 5 hours. Then, it is concentrated by evaporation in a vacuum, the residue is taken up in 250 ml of dichloromethane, and the solution is added in drops at 0°C while being stirred to the solution of 34.74 g ( 105.0 mmol) of

6-N-benzyloxycarbonyl-L-lysine-methyl ester, hydrochloride (commercially available products; Bachem) as well as 46.85 ml (350 mmol) of triethylamine in 400 ml of dichloromethane. It is allowed to stir overnight, mixed with 1 liter of 2N hydrochloric acid, the organic phase is shaken out, the water phase is extracted twice with 100 ml of dichloromethane each, the solution is dried on sodium sulfate, dessicant is filtered out, and it is concentrated by evaporation in a vacuum.
The crude product is purified on silica gel by chromatography. As an eluant, a mixture that consists of dichloromethane with the addition of 3% ethanol is used.

'The product is obtained as a colorless gel after the concentration by evaporation.
Yield: 67.0 g (87.6% of theory) Elementary analysis:
Cld.: 40.61 C 3.41 H 40.45 F 3.51 N
Fnd.: 40.48 C 3.54 H 40.61 F 3.37 N.
b) 2-N-2H,2H,4H,4H,SH,S,H-3-Oxaperfluorotridecanoyl-L-lysine methyl ester, hydrochloride I 0 g of catalyst (Pd I 0%/C) is added to a solution of 63.5 g (79.5 mmol) of the title substance of Example 1 a) in a mixture that consists of 500 ml of methanol and 90 ml of 1 N
hydrochloric acid, and it is hydrogenated until one equivalent of hydrogen is taken up at normal pressure and room temperature. Catalyst is filtered out, the latter is washed 3 times with 50 ml each of hot methanol, and the combined solutions are concentrated by evaporation. The residue is dissolved in methanol and brought to crystallization by adding diisopropyl ether.
The title compound is obtained in colorless crystals.
Yield: 55.70 g (quantitative) Elementary analysis:
Cld.: 32.56 C 3.16 H 5.06 CI 46.09 F 4.00 N
Fnd.: 32.44 C 3.28 H 4.95 Cl 46.21 F 4.1 I N

c) 6-N-3,6,9.12.15-Pentaoxa-hexadecanoyl-2-N-2H,2H,4H,4H,SH,SH-3-oxa-perfluorotridecanoyl-I-lysine-methyl ester 13.3 I g (50.0 mmol) of 3,6,9,12,15-pentaoxahexadecanoic acid (commercially available product) is dissolved in 100 ml of thionyl chloride, mixed with two drops of dimethylformamide and stirred overnight at room temperature. Then, it is heated for one hour to 65°C, excess thionyl chloride is removed in a rotary evaporator, and the residue is taken up in I
50 ml of dichloromethane. This solution is added in drops at 0°C to the solution of 35.04 g (50.0 mmol) of the title compound of Example Ib) and I5. I 8 g (150 mmol) of triethylamine in 350 ml of dichloromethane. Then, it is allowed to stir for 72 hours at room temperature.
It is concentrated by evaporation, and the product is obtained by column chromatography on silica gel. As an eluant, a mixture that consists of dichloromethane/ethanol 9: I is used. The title compound is obtained as a viscous, light yellow oil.
Yield: 37.0 g (81.1 % of theory) Elementary analysis:
Cld.: 39.48 C 4.53 H 35.39 F 3.07 N
Fnd.: 39.61 C 4.50 H 35.50 F 3.16 N
d) 6-N-3,6,9,12,1 S-Pentaoxahexadecanoyl-2-N-2H,2H,4H,4H,SH,SH-3-oxa-perfluorotridecanoyl-L-lysine 17.90 g of the title compound of Example 1 c) is stirred overnight in a mixture that consists of 50 ml of methanol and 25 ml of 2N sodium hydroxide solution. It is acidified with 2N hydrochloric acid, concentrated by evaporation in a vacuum, and the residue is extracted 5 times with 50 ml each of tetrahydrofuran/ethyl acetate 2:1. The combined extracts are dried on sodium sulfate. Desiccant is filtered out, and the solution is concentrated by evaporation. The residue is purified by column chromatography on silica gel. As a mobile solvent, a mixture that consists of dichloromethane/methanol and water in a ratio of 160:40:1 is used.
The title compound is obtained as a waxy, light yellow-colored residue.
Yield: 14.7 g (83.4% of theory) Elementary analysis:
Cld.: 38.76 C 4.37 H 35.94 F 3.I2 N
Fnd.: 38.87 C 4.25 H 36.07 F 3.21 N
e) 6-N-3,6,9,12,15-Pentaoxahexadecanoyl-2-N-2H,2H,4H,4H,5H,SH-3-oxaperfluorotridecanoyl-L-lysine-N- { 1,4, 7-tris[carboxylatomethyl]-1,4, 7,10-tetraazacyclododecane-10-(2-hydroxy-3-yl), gadolinium complex}-amide 8.0 g (8.9 mmol) of the acid that is produced under 1 d) as well as 2.05 g ( 17.8 mmol) of hydroxysuccinimide are dissolved in 50 ml of dimethylformamide and mixed at 0°C with 4.60 g (22.25 mmol) of dicyclohexylcarbodiimide. It is stirred for 10 more minutes at 0°C and then for another 2 hours at room temperature. After being cooled again to 0°C, a solution that consists of 3.93 g (6.65 mmol) of the gadolinium complex of 10-(3-amino-2-hydroxy-propyl)-1,4,7-tris-(carboxymethyl)-1,4,7,10-tetraazacyclododecane (WO 9S/17451) as well as O.S8 g (13.7 mmol) of lithium chloride and 2.77 g (27.4 mmol) of triethylamine in 40 ml of dimethyl sulfoxide is added. It is allowed to stir for two days at room temperature, mixed with 650 ml of acetone, and the solution is poured onto 21 of methyl-t-butyl ether. It is stirred for about 30 more minutes, and then solid is suctioned out. The solid is dissolved in distilled water and treated with activated carbon. The solution is filtered, concentrated by evaporation in a vacuum, and the residue is chromatographed on silica gel. As an eluant, a mixture that consists of methanol and dichloromethane is used in a 2:1 ratio.
Yield: 5.47 g (54.5% of theory) Water content: 7.3%
Elementary analysis (relative to anhydrous substance):
Cld.: 37.97 C 4.71 H 10.81 Gd 22.19 F 6.74 N
Fnd.: 38.16 4.83 10.72 22.32 6.83 Example 2 a) 10-(3-Carboxy-3-yl-propionic acid)-1,4,7,10-tetraazacyclododecane 150 g (761 mmol) of bromosuccinic acid is neutralized with sodium hydroxide solution (10%), and the solution is evaporated to the dry state. 65.55 g (380 mmol) of cyclene is dissolved in 300 ml of distilled water and mixed with the bisodium salt (from 150 g of bromosuccinic acid = 761 mmol). It is heated to SO°C and allowed to stir overnight. The solution is then evaporated to the dry state and co-distilled with ethanol.
The residue is taken up in butanol and extracted with water. The aqueous phase is concentrated by evaporation and chromatographed on silica gel. As an eluant, mixtures that consist of methanol with ammonia (20:1 - 2:1 ) are used. The product-containing fractions are combined and evaporated to the dry state.
Yield: 54.8 g (50.4% of theory) Elementary analysis:
Cld.: C 50.34 H 7.74 N 19.57 Fnd.: C 50.46 H 7.83 N 19.69 b) 1,4,7-Tris(carboxymethyl)-10-(3-carboxy-3-yl-propionic acid)-1,4,7,10-tetraazacyclododecane 11 g (38.14 mmol) of 10-(3-carboxy-3-yl-propionic acid)-1,4,7,10-tetraazacyclododecane is dissolved in 60 ml of distilled water and mixed with 18.03 g ( 190.74 mmol) of chloroacetic acid. It is then heated to 70°C, and the pH is kept between 9 and 10 by adding sodium hydroxide solution (32%). It is allowed to stir overnight at 70°C, then it is set again at a pH of 10, and 7.2 g (76.19 mmol) of chloroacetic acid is added to it. It is stirred for 3 more hours at 70°C. It is evaporated to the dry state, evaporated with methanol, taken up in methanol, and salts are filtered out. The filtrate is concentrated by evaporation and chromatographed on an ion-exchange column Amberlite 252 C with water/ammonia as an eluant. The product-containing fractions are combined, concentrated by evaporation, taken up again in distilled water and freeze-dried. The title compound is obtained as a white foam.
Yield: 13.12 g (82.3% of theory) Water content: 9.6%
Elementary analysis (relative to anhydrous substance):
Cld.: C 46.75 H 6.54 N 12.12 Fnd.: C 46.87 H 6.62 N 12.24 c) Gadolinium complex of 10-{1-carboxy-2-carbonyl-[piperazin-I-yl-4-(perfluorooctylsul fonyl)] } -ethyl-1,4, 7-tris(carboxymethyl)-1,4,7, I 0-tetraazacyclododecane, sodium salt 10.0 g ( 16.21 mmol) of the gadolinium complex tetraazacyclododecane (produced from the ligand by complexing with gadolinium oxide) and 3.0 g of lithium chloride are dissolved while being heated slightly in 100 ml of dimethyl sulfoxide. After cooling to room temperature, 9.21 g ( 16.21 mmol) of perfluorooctylsulfonylpiperazine is added. Then, it is cooled to 0°C, and 12.3 g (46.63 mmol) of EEDQ (1,2-dihydro2-ethoxyquinoline-1-carboxylic acid ethyl ester) is added, and it is stirred overnight at room temperature. The reaction is poured into a mixture that consists of 800 ml of methyl-t-butyl ether and 100 ml of acetone, and it is stirred. The precipitate is purified by chromatography on silica gel. A mixture that consists of dichloromethane/methanol and ammonia in a ratio of 2:2.1 is used as an eluant.
The product-containing fractions are combined and concentrated by evaporation. The residue is dissolved in 200 ml of distilled water, set at a pH of 7.2 with sodium hydroxide solution and freeze-dried.
The title compound is obtained as a white foam.
Yield: 7.64 g (39% of theory) Water content: 7:8%
Elementary analysis (relative to anhydrous substance):
Cld.: 30.31 C 2.80 H 27.17 F 13.23 Gd 7.07 N 1.93 Na 2.70 S
Fnd.: 30.42 C 2.91 H 27.04 F 13.29 Gd 7.15 N 2.04 Na 2.59 S

Example 3 a) 1,4,7-Tris(carboxylatomethyl)-1,4,7,10-tetraazacyclododecane-10-[2-hydroxy3-(N-benzyloxycarbonyltriglycidyl)-)-aminoJ-propyl, gadolinium complex 12.68 g (39.121 mmol) of N-benzyloxy-carbonyltriglycine (commercially available product, Bachem) is dissolved in 100 ml of dimethylformamide and mixed with 9.03 g (78.42 mmol) of N-hydroxysuccinimide. It is cooled to 0°C, and then 32.36 g ( 156.84 mmol) of dicyclohexylcarbodiimide is added to it. It is stirred for 20 minutes at 0°C and then for another 3 hours at room temperature. This suspension is then added to the solution, cooled to 0°C, that consists of 15 g (26.14 mmol) of the gadolinium complex of 10-(3-amino-2-hydroxy-propyl)-1,4,7-tris(carboxymethyl)-1,4,7,10-tetraazacyclododecane (produced according to WO 95/17451) in 40 ml of distilled water and 15 ml ( 14 mmol) of triethylamine in 60 ml of isopropanol while being stirred. After addition is completed, it is stirred for 3 hours at room temperature. Then, urea is filtered out, it is rewashed with n-butanol and concentrated by evaporation in a vacuum.
The residue is extracted several times with water. The organic phase is dried on sodium sulfate and concentrated by evaporation in a vacuum. The residue is chromatographed on silica gel. As an eluant, a mixture that consists of dichloromethane, methanol and ammonia is used. The product-containing fractions are combined, concentrated by evaporation in a vacuum, taken up again in distilled water, and subjected to freeze-drying. The title compound is obtained as a white foam.
Yield: 12.94 g (56.3% of theory) Elementary analysis:
Cld.: 42.36 C 5.16 H 17.89 Gd 12.75 N
Fnd.: 42.44 C 5.22 H 17.78 Gd 12.80 N

b) 1,4,7-Tris(carboxylatomethyl)-1,4,7,10-tetraazacyclododecane-10-(2-hydroxy-3-amino-triglycidyl)-propyl, gadolinium complex In a mixture that consists of 100 ml of ethanol and 30 ml of distilled water, 8.53 g (9.7 mmol) of the title compound of Example 3a) is dissolved and mixed with 2 g of catalyst (palladium 10% on activated carbon) as well as 3 ml of acetic acid. It is hydrogenated until one equivalent of hydrogen is taken up. Then, catalyst is suctioned out, it is rewashed with ethanol, and the solution is evaporated to the dry state in a vacuum.
The title compound is obtained as a foam.
Yield: 7.22 g (quantitative) Elementary analysis:
Cld.: 37.08 C 5.28 H 21.11 Gd 15.04 N
Fnd.: 37.21 C 5.33 H 21.25 Gd 1 S.15 N
c) 1,4,7-Tris(carboxylatomethyl)-1,4,7,10-tetraazacyclododecane-10-{2-hydroxy-[triglycidyl-N-(2H,2H,4H,4H,SH,SH-3-oxa-perfluorotridecanoyl)]amino}-propyl, gadolinium complex

7.60 g ( 14.55 mmol) of 2H,2H,4H,4H,SH,SH-3-oxa-perfluorotridecanoic acid is dissolved in 90 ml of dimethylformamide and mixed with 3.35 g (29.1 mmol) of N-hydroxysuccinimide. It is cooled to 0°C and then mixed with 11.71 g (56.71 mmol) of dicyclohexylcarbodiimide. A$er 20 minutes, the cooling is removed, and it is stirred for another 3 hours at room temperature. Then, the suspension that was produced is added while being stirred to the solution, cooled to 0°C, of 7.22 g (9.7 mmol) of the title compound of Example 3b) in a mixture that consists of 5 ml (36.7 mmol) of triethylamine, 20 ml of distilled water, and 30 ml of 2-propanol. It is allowed to stir overnight at room temperature, then dicyclohexylurea is filtered out, it is rewashed with 2-propanol/distilled water 3:2 and the combined solutions are concentrated by evaporation in a vacuum. The residue is dissolved in a mixture that consists of water and butanol and extracted with butanol. The combined organic solutions are dried and concentrated by evaporation in a vacuum. The residue is purified by chromatography on silica gel. A mixture that consists of ethanol/2-propanol/concentrated ammonia in a ratio of 15:10:1 is used as an eluant. The product-containing fractions are combined, evaporated to the dry state in a vacuum, dissolved again in distilled water and freeze-dried. The title compound is obtained as a white foam.
Yield: 7.52 g (62.1 % of theory) Elementary analysis:
Cld.: 33.66 C 3.55 H 25.86 F 12.59 Gd 8.97 N
Fnd.: 33.55 C 3.67 H 25.99 F 12.43 Gd 9.09 N
Example 4: Binding to a Fibrin Gel A coagulate (fibrin gel) forms after a 30-minute incubation time (room temperature) by mixing fibrinogen with thrombin. The latter is mixed with 0.5 ml of PBS and with 0.5 ml of a solution of the title compound of Example 21, WO 02/13874, Mk 13, (0.01 and 0.1 mmol of Gd/1), and it is incubated over 16 hours at room temperature. After the supernatant is removed in the fibrin gel, the unbonded portion of the compound according to the invention is separated from fibrin by ultrafiltration (1,200 g for 30 minutes). The gadolinium content in the fibrin gel is determined by means of inductively coupled plasma-atom emissions spectroscopy (ICP-AES).
The binding of the compound according to the invention to the fibrin gel was 79.1 % for the 0.01 mmol of Gd/1 solution and 38.5% for the 0.1 mmol of Gd/1 solution.

Example 5: MRT Visualization (In-Vivo) of a Venous Thrombus after Intravenous Administration of the Contrast Medium in Rabbits 'The MR imaging was carried out in rabbits with photochemically induced thrombus (PIT). By irradiation with xenon light (540 nm, 1,100 klux, 25 minutes) after i.v. injection of rose-Bengal (20 mg/kg), the thrombus formation was induced in the left femoral vein. The blood flow in the femoral vein was controlled by means of an ultrasound probe. The imaging was carned out with a Magnetom Harmony (Siemens, 1T) before (baseline) as well as 25, 40 minutes, l, 2, 3, 4, 24, and 48 hours after intravenous administration (about 1 hour after the thrombus induction) of 0.1 mmol of Gd/kg of the title compound of Example 21, WO
02/13874, with use of a phase-contrast sequence (TR/TE = 104/14 ms) as well as T1-weighted gradient echo sequences (MPRage: TR/TE/TI/a = 11/4/120ms/8°; and 3D flash: TR/TE/a =
S/2ms/SO°).
After the imaging, the left femoral vein (with the thrombus) was prepared outside, fixed in formalin, and stained for histological evaluation with hematoxylin/eosin (HE) or phosphotungstic acid/hematoxylin (PTAH).
In the MR imaging (MRA), the thrombus was already detectable early on (25 minutes p.i.). Images 1 and 2 that are indicated in Figure 1 show MR images of the pelvic region 24 hours after intravenous administration of 0.1 mmol of Gd/kg of body weight of the compound according to the invention in the PIT rabbit (photochemically induced thrombus). The Tl-weighted 3D-flash sequence illustrates a strong signal increase in the thrombus in the area of the left femoral vein. The blood flow in the left femoral vein is considerably reduced (see MRI with phase-contrast sequence).
With both staining techniques (HE and PTAH (Fig. 2, Images 3 and 4)), the red blood clots (thrombi) could be detected in the area of the left femoral vein. The thrombi fill almost the entire lumen of the blood vessel. The exfoliation of the vascular endothelial cells and the adhesion of the thrombi is clearly visible. The intima- and adventitia nuclei have disappeared almost completely.
With this test, the suitability of the compounds according to the invention could be shown as markers for venous thrombi.
Example 6 MRT Visualization (Ex-Vivo) of a Venous Thrombus According to Intravenous Administration of the Contrast Medium in Rabbits The MR imaging was carried out in rabbits with photochemically induced thrombus (PIT). By irradiation with xenon light (540 nm, 1,100 klux, 25 minutes) after i.v. injection of rose-Bengal (20 mg/kg), the thrombus formation was induced in the left femoral vein. 24 hours after intravenous administration (about 1 hour a8er the thrombus induction) of 0.1 mmol of Gd/kg of the title compound of Example 21 WO 02/13874, the animal was sacrificed, and the left femoral vein (with the thrombus) was prepared outside. The imaging of the damaged venous segment was carned out with a Magnetom I-Iarmony (Siemens; 1T) with use of a T1-weighted spin echo sequence (Tlt/TE/a = 300/12 ms/90°, with and without fat suppression).
The induced thrombus is clearly visible in the preparation by the color change. In addition, blood clots are also found outside of the vessel. In the ex-vivo MR
imaging, a considerable enhancement of the thrombi can be observed with the T1-weighted spin echo sequence (see Fig. 3, Images S to 7).

Example 7: Determination of the Gadolinium Concentration in the Thrombus After Intravenous Administration of the Contrast Medium in Rabbits The determination of content was carried out in rabbits with photochemically induced thrombus (PIT). By irradiation with xenon light (540 nm, 1,100 klux, 25 minutes) after i.v.
injection of rose-Bengal (20 mg/kg), the thrombus formation was induced in the left femoral vein. 24 hours after intravenous administration (about 1 hour after the thrombus induction) of 0.1 mmol of Gd/kg of the title compound of Example 21 WO 02/13874, the animal was sacrificed, and various organs and tissues were removed to determine the Gd content: blood, femoral veins (with and without thrombus), muscle. After the tissue samples decomposed, the gadolinium concentration (ppm) was measured by means of ICP-AES.
In the left femoral vein (with thrombus), the Gd concentration was 63 ppm;
however, it was only 35 ppm in the control vessel. The blood clot outside of the vessel had a high Gd content of 166 ppm. In the blood at the time of 24 hours p.i., only a Gd concentration of 15 ppm was detectable, and in the non-signal-enhanced muscle, a Gd concentration of 10 ppm was detectable.

Claims

1. Use of perfluoroalkyl-containing metal complexes that have a critical micelle formation concentration < 10 -3 mol/l, a hydrodynamic micelle diameter (2 Rh) > 1 nm and a proton relaxivity in plasma (R1) > 10 l/mmols as contrast media in MR imaging for visualization of intravascular thrombi.

2. Use according to claim 1, characterized in that the metal complexes are used as MRI
contrast media for visualization of venous thrombi.

3. Use according to claim 1 or 2, wherein the metal complexes are used as MRI
contrast media for visualization of arterial thrombi.

4. Use according to one of claims 1 to 3, wherein the metal complexes are used as MRI
contrast media for early determination of a thrombotic occlusive disease.

5. Use according to claim 1, wherein metal complexes whose micelle formation concentration is < 10 -4 mol/l are used.

6. Use according to claim 1, wherein metal complexes whose hydrodynamic micelle diameter is >= 3 nm, preferably > 4 nm, are used.

7. Use according to claim 1, wherein metal complexes that have a proton relaxivity in plasma of > 13 l/mmols, preferably > 15 l/mmols, are used.

8. Use according to one of claims 1 to 7, wherein as perfluoroalkyl-containing metal complexes, the compounds of general formula I
R F-L-K ~I
in which R F is a perfluorinated, straight-chain or branched carbon chain with formula -C n F2n E, in which E represents a terminal fluorine, chlorine, bromine, iodine or hydrogen atom and n stands for numbers 4-30, L means a direct bond, a methylene group, an -NHCO group, a group whereby p means the numbers 0 to 10, and q and n, independently of one another, mean numbers 0 or 1, and R a is a hydrogen atom, a methyl group, a benzyl group, a phenyl group, a -CH2-OH group, a CH2OCH3 group, a -CH2-CO2H group or a C2-C15 chain, which optionally is interrupted by 1 to 3 oxygen atoms, 1 to 2 >CO groups or an optionally substituted aryl group and/or is substituted with 1 to 4 hydroxyl groups, 1 to 2 C1-C4 alkoxy groups, 1 to 2 carboxy groups, or a group -SO3H-, or is a straight-chain, branched, saturated or unsaturated C2-C30 carbon chain, which optionally contains 1 to 10 oxygen atoms, 1 to 3 -NR a groups, 1 to 2 sulfur atoms, a piperazine, a -CONR a group, one to six -NR a CO groups, an -SO2 group, an -NR a-CO2 group, 1 to 2 CO groups, a group or 1 to 2 optionally substituted aryls and/or is interrupted by these groups and/or is optionally substituted with 1 to 3 -OR a groups, 1 to 2 oxo groups, 1 to 2 -NH-COR a groups, 1 to 2 -CONHR a groups, 1 to 2 -(CH2)p-CO2H groups, 1 to 2 groups -(CH2)p-(O)q-CH2CH2-R F, whereby R a, R F and p and q have the above-indicated meanings, and T means a C2-C10 chain, which optionally is interrupted by 1 to 2 oxygen atoms or 1 to 2 -NHCO groups, K stands for a complexing agent or metal complex or their salts of organic and/or inorganic bases or amino acids or amino acid amides, specifically for a complexing agent or complex of general formula II
in which R c, R1 and B are independent of one another, and R c has the meaning of R a or means -(CH2)m-L-R F, whereby m is 0, 1 or 2, and L and R F have the above-mentioned meaning, R 1, independently of one another, mean a hydrogen atom or a metal ion equivalent of atomic numbers 22-29, 42-46 or 58-70, B means -OR1 or whereby R1, L, R F and R c have the above-mentioned meanings, or K stands for a complexing agent or complex of general formula III

in which R c and R1 have the above-mentioned meanings, R b has the meaning of R a, or K stands for a complexing agent or complex of general formula IV
in which R1 has the above-mentioned meaning or K stands for a complexing agent or complex of general formula V

in which R1 has the above-mentioned meaning, and o and q stand for number 0 or 1, and yields the sum o + q = 1, or K stands for a complexing agent or complex of general formula VI
in which R1 has the above-mentioned meaning or K stands for a complexing agent or complex of general formula VII

in which R1 and B have the above-mentioned meanings or K stands for a complexing agent or complex of general formula VIII
in which R c and R1 have the above-mentioned meanings, and R b has the above-mentioned meaning of R a or K stands for a complexing agent or complex of general formula IX
in which R c and R1 have the above-mentioned meanings, or K stands for a complexing agent or complex of general formula X
in which R c and R1 have the above-mentioned meanings, or K stands for a complexing agent or complex of general formula XI
in which R1, p and q have the above-mentioned meaning, and R b has the meaning of R a, or K stands for a complexing agent or complex of general formula XII

in which L, R F and Z1 have the above-mentioned meanings, or K stands for a complexing agent or complex of general formula XIII
in which R1 has the above-mentioned meaning, are used.

9. Use according to claim 8, wherein the compounds of general formula I, in which L
stands for .alpha.-CH2-.beta.
.alpha.-CH2CH2-.beta.
.alpha.-(CH2)s-.beta. s = 3 - 15 .alpha.-CH2-O-CH2CH2-.beta.
.alpha.-CH2-(O-CH2-CH2-)t-.beta. t = 2 - 6 .alpha.-CH2-NH-CO-.beta.
.alpha.-CH2-NH-CO-CH2-N(CH2COOH)-SO2-.beta.

.alpha.-CH2-NH-CO-CH2-N(C2H5)-SO2-.beta.
.alpha.-CH2-NH-CO-CH2-N(C10H21)-SO2-.beta.
.alpha.-CH2-NH-CO-CH2-N(C6H13)-SO2-.beta.
.alpha.-CH2-NH-CO-(CH2)10-N(C2H5)SO2-.beta.
.alpha.-CH2-NH-CO-CH2-N(-CH2-C6H5)-SO2-.beta.
.alpha. CH2-NH-CO-CH2-N(-CH2-CH2-OH)SO2-.beta.
.alpha.-CH2-NHCO-(CH2)10-S-CH2CH2-.beta.
.alpha.-CH2NHCOCH2-O-CH2CH2-.beta.
.alpha.-CH2NHCO(CH2)10-O-CH2CH2-.beta.
.alpha.-CH2-C6H4-O-CH2CH2-.beta.
.alpha.-CH2-O-CH2-C(CH2-OCH2CH2-C6F13)2-CH2-OCH2-CH2-.beta.
.alpha.-CH2-NHCOCH2CH2CON-CH2CH2NHCOCH2N(C2H5)SO2C8F17 ¦
CH2-CH2NHCOCH2N(C2H5)-SO2-.beta.
.alpha.-CH2-O-CH2-CH(OC10H21)-CH2-O-CH2CH2-.beta.
.alpha.-(CH2NHCO)4-CH2O-CH2CH2-.beta.
.alpha.-(CH2NHCO)3-CH2O-CH2CH2-.beta.
.alpha.-CH2-OCH2C(CH2OH)2-CH2-O-CH2CH2-.beta.
.alpha.-CH2NHCOCH2N(C6NH5)-SO2-.beta.
.alpha.-NHCO-CH2-CH2-.beta.
.alpha.-NHCO-CH2-O-CH2CH2-.beta.
.alpha.-NH-CO-.beta.
.alpha.-NH-CO-CH2-N(CH2COOH)-SO2-.beta.
.alpha.-NH-CO-CH2-N(C2H5)-SO2-.beta.
.alpha.-NH-CO-CH2-N(C10H21)-SO2-.beta.
.alpha.-NH-CO-CH2-N(C6H13)-SO2-.beta.
.alpha.-NH-CO-(CH2)10-N(C2H5)-SO2-.beta.
.alpha.-NH-CO-CH2-N(-CH2-C6H5)-SO2-.beta.
.alpha.-NH-CO-CH2-N(-CH2-CH2-OH)SO2-.beta.
.alpha.-NH-CO-CH2-.beta.

.alpha.-CH2-O-C6H4-O-CH2CH2-.beta.
.alpha.-CH2-C6H4-O-CH2-CH2-.beta.
.alpha.-N(C2H5)-SO2-.beta.
.alpha.-N(C6H5)-SO2-.beta.
.alpha.-N(C10H21)-SOS-.beta.
.alpha.-N(C6H13)-SO2-.beta.
.alpha. N(CH2H4OH)-SO2-.beta.
.alpha. N(CH2COOH)-SO2-.beta.
.alpha.-N(CH2C6H5)-SO2-.beta.
.alpha.-N-[CH(CH2OH)2]-SO2-.beta.
.alpha.-N-[CH(CH2OH)CH(CH2OH))-SO2-.beta.
and in which .alpha. represents the binding site to the complexing agent or metal complex K, and .beta.
represents the binding site to the fluorine radical, are used.

10. Use according to claim 8 or 9, wherein the compounds of formula I in which n in formula -C n F2n E stands for numbers 4-15 and/or E in this formula means a fluorine atom are used.

11. Use according to one of claims 8 to 10, wherein the following compounds are used:
-- Gadolinium complex of 10-[1-methyl-2-oxo-3-aza-5-oxo-{4-perfluorooctylsulfonyl-piperazin-1-yl}-pentyl]-1,4,7-tris(carboxymethyl)-1,4,7,10-tetraazacyclododecane, -- Gadolinium complex of 10-[2-hydroxy-4-aza-5-oxo-7-oxa-10,10,11,11,12,12,13,13,14,14,15,15,16,16,17,17-heptadecafluoroheptadecyl]-1,4,7-tris(carboxymethyl)-1,4,7,10-tetraazacyclododecane, -- Gadolinium complex of 10-[2-hydroxy-4-aza-5,9-dioxo-9-{4-perfluorooctyl)-piperazin-1-yl}-nonyl]-1,4,7-tris(carboxymethyl)-1,4,7,10-tetraazacyclododecane, -- Gadolinium complex of 10-[2-hydroxy-4-aza-5-oxo-7-aza-7-(perfluorooctyl-sulfonyl)-nonyl]-1,4,7-tris(carboxymethyl)-1,4,7,10-tetraazacyclododecane, -- Gadolinium complex of 10-[2-hydroxy-4-oxa-1H,1H,2H,3H,3H,5H,5H,6H,6H-perfluorotetradecyl]-1,4,7-tris(carboxymethyl)-1,4,7,10-tetraazacyclododecane, -- Gadolinium complex of 10-[2-hydroxy-4-aza-5-oxo-7-oxa-10,10,11,11,12,12,13,13,14,14,15,15,16,16,17,17,18,18,19,19-henicosafluoro-nonadecyl]-1,4,7-tris(carboxymethyl)-1,4,7,10-tetraazacyclododecane, -- Gadolinium complex of 10-[2-hydroxy-4-aza-5-oxo-11-aza-11-(perfluorooctylsulfonyl)-tridecyl]-1,4,7-tris(carboxymethyl)-1,4,7,10-tetraazacyclododecane, -- Gadolinium complex of 10-[2-hydroxy-4-aza-5-oxo-7-aza-7-(perfluorooctylsulfonyl)-8-phenyl-octyl]-1-4-7-tris(carboxymethyl)-1,4,7,10-tetraaza-cyclododecane.

12. Use according to one of claims 1-7, wherein as perfluoroalkyl-containing metal complexes, the compounds of general formula Ia A-R F (Ia) in which .cndot. A is a molecule part that contains 2 to 6 metal complexes, which are bonded directly or via a linker to a nitrogen atom of an annular skeleton chain, and .cndot. R F is a perfluorinated, straight-chain or branched carbon chain with formula -C n F2n E, in which E represents a terminal fluorine, chlorine, bromine, iodine or hydrogen atom, and n stands for numbers 4-30, whereby molecule part A has the following structure:

whereby .cndot. q1 is a number 0, 1, 2 or 3, .cndot. K stands for a complexing agent or metal complex or their salts of organic and/or inorganic bases or amino acids or amino acid amides, .cndot. X is a direct bond to the perfluoroalkyl group, a phenylene group or a alkylene chain, which optionally contains 1-15 oxygen atoms, 1-5 sulfur atoms, carbonyl groups, 1-10 (NR d) groups, 1-2 NR d SO2 groups, 1-10 CONR d groups, 1 piperidine group, 1-3 SO2 groups and 1-2 phenylene groups or optionally is substituted by 1-3 radicals R F, in which R d stands for a hydrogen atom, a phenyl group, benzyl group or a C1-C15 alkyl group, which optionally contains 1-2 NHCO
groups, 1-2 CO groups, or 1-5 oxygen atoms and optionally is substituted by 1-hydroxy, 1-5 methoxy, 1-3 carboxy, or 1-3 R F radicals, .cndot. V is a direct bond or a chain of general formula IIa or IIIa:

in which ~ Re is a hydrogen atom, a phenyl group, a benzyl group or a C,-C7-alkyl group, which optionally is substituted with a carboxy group, a methoxy group or a hydroxy group, ~ W is a direct bond, a polyglycol ether group with up to 5 glycol units, or a molecule part of general formula IVa -CH(Rh)- (IVa) in which Rh is a C1,-C7 carboxylic acid, a phenyl group, a benzyl group or a -(CH2)1-5-NH-K group, ~ a represents the binding to the nitrogen atom of the skeleton chain, .beta.
represents the binding to complexing agents or metal complex K, ~ and in which variables k and m stand for natural numbers between 0 and 10, and 1 stands for 0 or 1 and whereby D is a CO or SO2 group, are used.

13. Use according to claim 12, wherein the compounds of general formula Ia in which q is the number 1 are used.

14. Use according to claim 12, wherein the compounds of general formula Ia are used, in which molecule part X is an alkylene chain, which contains 1-10 CH2CH2O groups or 1-5 COCH2NH groups, a direct bond or one of the following structures whereby .gamma. binds to D, and 8 binds to RF.

15. Use according to claim 12, wherein the compounds of general formula Ia, in which V
is a molecule part with one of the following structures are used.

I 6. Use according to claim 12, wherein the compounds of general formula Ia, in which K
represents a complex of general formula Va, VIa, VIIa or VIIIa, (Va) are used, whereby R4, independently of one another, are a hydrogen atom or a metal ion equivalent of the elements of atomic numbers 23-29, 42-46 or 58-70, ~ R5 is a hydrogen atom or a straight-chain, branched, saturated or unsaturated C1-C30 alkyl chain, which optionally is substituted by 1-5 hydroxy, 1-3 carboxy or 1 phenyl groups) and/or optionally is interrupted by 1-10 oxygen atoms, I
phenylene group or 1 phenylenoxy group, ~ R6 is a hydrogen atom, a straight-chain or branched C1-C7 alkyl radical, a phenyl radical or a benzyl radical, ~ R7 is a hydrogen atom, a methyl group or ethyl group, which optionally is substituted by a hydroxy group or carboxy group, ~ U3 is a straight-chain, branched, saturated or unsaturated C1-C20 alkylene group optionally containing 1-5 imino groups, 1-3 phenylene groups, 1-3 phenylenoxy groups, 1-3 phenylenimino groups, 1-5 amide groups, 1-2 hydrazide groups, 1 -5 carbonyl groups, 1-5 ethylenoxy groups, 1 urea group, 1 thiourea group, 1-2 carboxyalkylimino groups, 1-2 ester groups, 1-1-0 oxygen atoms, 1-5 sulfur atoms and/or 1-5 nitrogen atoms, and/or optionally substituted by 1-5 hydroxy groups, 1-2 mercapto groups, 1-5 oxo groups, 1-5 thioxo groups, 1-3 carboxy groups, 1-5 carboxyalkyl groups, 1-5 ester groups and/or 1-3 amino groups, whereby the optionally contained phenylene groups can be substituted by 1-2 carboxy groups, 1-2 sulfone groups or 1-2 hydroxy groups ~ T1 stands for a -CO-.beta. or -NHCO-.beta. or -NHCS-.beta. group, whereby .beta. represents the binding site to V.

17. Use according to claim 16, wherein the C1-C20-alkylene chain that stands for U3 contains the groups -CH2NHCO-, -NHCOCH2O-, -NHCOCH2OC6H4-,-N(CH2COZ2H)-, -CH2OCH2-, -NHCOCH2C6H4-, -NHCSNHC6H4-, -CH2OC6H4-, -CH2CH2O- and/or is substituted by the groups -COOH and -CH2COOH.

18. Use according to claim 16, wherein U3 stands for a -CH2-, -CH2CH2-, -CH2CH2CH2-, -C6H4-, -C6H10-, -CH2C6H4-, -CH2NHCOCH2CH(CH2CO2H)-C6H4-, -CH2NHCOCH2OCH2-, or -CH2NHCOCH2C6H4- group.

19. Use according to claim 12, wherein the compounds of general formula Ia in which K
has one of the following structures:
are used.

20. Use according to one of claims 12 to 19, wherein the compounds of general formula Ia in which the perfluoroalkyl chain RF is -C6F13, -CgF17, -C10F21, or -C12F25 are used.

21. Use according to one of claims 12 to 20, wherein the gadolinium complex of 1,4,7-tris{ 1,4,7-tris(N-(carboxylatomethyl)-10-[N-1-methyl-3,6-diaza-2,5,8-trioxooctane-1,8-diyl)]-1,4,7,10-tetraazacyclododecane, Gd complex}-10-[N-2H,2H,4H,4H,5H,5H-3-oxa-perfluorotridecanoyl]-1,4,7,10-tetraazacyclododecane is used.

22. Use according to one of claims 1 to 7, wherein as perfluoroalkyl-containing metal complexes, the compounds of general formula Ib in which K means a complexing agent or a metal complex of general formula IIb whereby R1 stands for a hydrogen atom or a metal ion equivalent of atomic numbers 23-29, 42-46 or 58-70, R2 and R3 stand for a hydrogen atom, a C1-C7-alkyl group, a benzyl group, a phenyl group, -CH2OH or -CH2-OCH3, U2 stands for radical L1, whereby L1 and U2, independently of one another, can be the same or different, however, A1 means a hydrogen atom, a straight-chain or branched C1-C3o alkyl group, which optionally is interrupted by 1-15 oxygen atoms, and/or optionally is substituted with 1-10 hydroxy groups, 1-2 COOH groups, a phenyl group, a benzyl group and/or 1-5 -OR9 groups, with R9 in the meaning of a hydrogen atom or a C1-C7 alkyl radical, or -L1-RF, L1 means a straight-chain or branched C1-C30-alkylene group, which optionally is interrupted by 1-10 oxygen atoms, 1-5 -NH-CO groups, 1-5 -CO-NH groups, by a phenylene group optionally substituted by a COOH-group, 1-3 sulfur atoms, 1-2 -N(B1)-SO2 groups, and/or 1-2 -SO2-N(B1)- groups with B1 in the meaning of A1, and/or optionally is substituted with radical RF, and RF means a straight-chain or branched perfluorinated alkyl radical of formula CnF20E, whereby n stands for numbers 4-30, and E stands for a terminal fluorine atom, chlorine atom, bromine atom, iodine atom or a hydrogen atom, and optionally present acid groups optionally can be present as salts of organic and/or inorganic bases or amino acids or amino acid amides, are used.

23. Use according to claim 22, wherein the compounds of general formula Ib, in which R2, R3 and R9, independently of one another, mean hydrogen or a C1-C4 alkyl group, are used.

24. Use according to claim 22, wherein the compounds of general formula Ib, in which A' means hydrogen, a C1-C15 alkyl radical, the radicals C2H4-O-CH3,C3H6-O-CH8, C3H4-O-(C2H4-O)-C2H4-OH, C2H4-O-(C2H4-O)-C2H4-(OCH3), C2H4OH, C3H6OH, C4H8OH, C5H10OH, C6H12OH, C7H14OH, CH(OH)CH2OH, CH(OH)CH(OH)CH2OH, CH2[CH(OH)]u1,CH2OH, CH[CH2(OH)]CH(OH)CH2OH, C2H4CH(OH)CH2OH, (CH2)5 COOH, C2H4-O-(C2H4-O)t-CH2COOH or C2H4-O-(C2H4-O)t-C2H4-C n F2nE, whereby s stands for integers 1 to 15, t stands for integers 0 to 13, u1 stands for integers 1 to 10, n stands for integers 4 to 20, and E stands for a hydrogen, fluorine, chlorine, bromine or iodine atom, and if possible, the branched isomers thereof, are used.

25. Use according to claim 22, wherein the compounds of general formula Ib, in which A1 means hydrogen, C1-C10 alkyl, C2H4-O-CH3, C3H6-O-CH3, C2H4-O-(C2H4-O)x-C2H4-OH, C2H4-O-(C2H4-O)x-C2H4-OCH3, C2H4OH, C3H6OH, CH2[CH(OH))y CH2OH, CH[CH2(OH)]CH(OH)CH2OH, (CH2)w COOH, C2H4-O-(C2H4-O)x-CH2COOH, C2H4-O-(C2H4-O)x-C2H4-C n F2nE, whereby x stands for integers 0 to 5, y stands for integers 1 to 6, w stands for integers 1 to 10, n stands for integers 4 to 15, and E stands for a fluorine atom, and, if possible, the branched isomers thereof are used.

26. Use according to claim 22, wherein the compounds of general formula Ib, in which L1 means .alpha.-(CH2)s-.beta.
.alpha.-CH2-CH2-(O-CH2-CH2-).UPSILON.-.beta.
.alpha.-CH2-(O-CH2-CH2-).UPSILON.-.beta., .alpha.-CH2-NH-CO-.beta.
.alpha.-CH2-CH2-NH-SO2-.beta.
.alpha.-CH2-NH-CO-CH2-N(CH2COOH)-SO2-.beta.
.alpha.-CH2-NH-CO-CH2-N(C2H5)-SO2-.beta.
.alpha.-CH2-NH-CO-CH2-N(C10H21)-SO2-.beta.
.alpha.-CH2-NH-CO-CH2-N(C6H13)-SO2-.beta.
.alpha.-CH2-NH-CO-(CH2)10-N(C2H5)-SO2-.beta.
.alpha.-CH2-NH-CO-CH2-N(-CH2-C6H5)-SO2-.beta.
.alpha.-CH2-NH-CO-CH2-N(-CH2-CH2-OH)SO2-.beta.
.alpha.-CH2-NHCO-(CH2)10-S-CH2CH2-.beta.
.alpha.-CH2NHCOCH2-O-CH2CH2-.beta.
.alpha.-CH2-CH2NHCOCH2-O-CH2CH2-.beta.
.alpha.-CH2-(CH2-CH2-O)1-(CH2)3NHCO-CH2-O-CH2CH2-.beta.
.alpha.-CH2NHCO(CH2)10-O-CH2CH2-.beta.
.alpha.-CH2CH2NHCO(CH2)10-O-CH2CH2-.beta.
.alpha.-CH2-C6H4-O-CH2CH2-.beta., whereby the phenylene group 1,4 or 1,3 is linked .alpha.-CH2-O-CH2-C(CH2-OCH2CH2-C6F13)2-CH2-OCH2-CH2-.beta.
.alpha.-CH2-NHCOCH2CH3CON-CH2CH2NHCOCH2N(C2H5)SO2C8F17.beta.
.alpha.-CH2-CH2NHCOCH2N(C2H5)-SO2-.beta.
.alpha.-CH2-O-CH2-CH(OC10H21)-CH2-O-CH2CH2-.beta.
.alpha.-(CH2NHCO)4-CH2O-CH2CH2-.beta.
.alpha.-(CH2NHCO)3-CH2O-CH2CH2-.beta.
.alpha.-CH2-OCH2C(CH2OH)2-CH2-O-CH2CH2-.beta.

.alpha.-CH2NHCOCH2N(C6H5)-SO2-.beta.
.alpha.-NHCO-CH2-CH2-.beta.
.alpha.-NHCO-CH2-O-CH2CH2-.beta.
.alpha.-NH-CO-.beta.
.alpha.-NH-CO-CH2-N(CH2COOH)-SO2-.beta.
.alpha.-NH-CO-CH2-N(C2H5)-SO2-.beta.
.alpha.-NH-CO-CH2-N(C10H21)-SO2-.beta.
.alpha.-NH-CO-CH2-N(C6H13)-SO2-.beta.
.alpha.-NH-CO-(CH2)10-N(C2H5)-SO2-.beta.
.alpha.-NH-CO-CH2-N(-CH2-C6H5)-SO2-.beta.
.alpha.-NH-CO-CH2-N(-CH2-CH2-OH)-SO2-.beta.
.alpha.-NH-CO-CH2-.beta.
.alpha.-CH2-O-C6H4-O-CH2-CH2-.beta.
.alpha.-CH2-C6H4-O-CH2-CH2-.beta.
.alpha.-N(C2H5)-SO2-.beta.
.alpha.-N(C6H5)-SO2-.beta.
.alpha.-N(C10H21)-SO2-.beta.
.alpha.-N(C6H13)-SO2-.beta.
.alpha.-N(C2H4OH)-SO2-.beta.
.alpha.-N(CH2COOH)-SO2-.beta.
.alpha.-N(CH2C6H5)-SO2-.beta.
.alpha.-N-[CH(CH2OH)2]-SO2-.beta.
.alpha.-N-[CH(CH2OH)CH(OH)(CH2OH)]-SO2-.beta.
whereby s stands for integers 1 to 15 and y stands for integers 1 to 6, are used.

27. Use according to claim 22, wherein the compounds of general formula Ib, in which L1 means .alpha.-CH2-O-CH2-.beta.
.alpha.-CH2-CH2-(O-CH2-CH2-)y-.beta., .alpha.-CH2-(O-CH2-CH2-)y-.beta., .alpha.-CH2-CH2-NH-SO2-.beta., .alpha.-CH2NHCOCH2-O-CH2CH2-.beta., .alpha.-CH2-CH2NHCOCH2-O-CH2CH2-.beta., .alpha.-CH2(CH2-CH2-O)y-(CH2)3NHCO-CH2-O-CH2CH2-.beta., .alpha.-CH2NHCO(CH2)10-O-CH2CH2-.beta., .alpha.-CH2CH2NHCO(CH2)10-O-CH2CH2-.beta., .alpha.-CH2-O-CH2-CH(OC10H21)-CH2-O-CH2CH2-.beta., .alpha.-CH2-O-C6H4-O-CH2-CH2-.beta.
or .alpha.-CH2-C6H4-O-CH2-CH2-.beta.
whereby y stands for integers 1 to 6, are used.

28. Use according to claim 22, wherein the compounds of general formula Ib, in which R F means a straight-chain or branched perfluorinated alkyl radical of formula C n F2n E, whereby n stands for numbers 4 to 15 and E stands for a terminal fluorine atom, are used.

29. Use according to one of claims 22 to 28, wherein the following compounds are used:
-- 1,4,7-Tris(carboxylatomethyl)-10-(3-aza-4-oxo-hexan-5-ylic)-acid-(2,3-dihydroxypropyl)-N-(1H,1H,2H,2H,4H,4H,5H,5H-3-oxa)-perfluorotridecyl)-amide]-1,4,7,10-tetraazacyclododecane, gadolinium complex -- 1,4,7-Tris(carboxylatomethyl)-10-{(3-aza-4-oxo-hexan-5-ylic)acid-N-(3,6,9,12,15-pentaoxa)-hexadecyl)-(1H,1H,2H,2H,4H,4H,5H,5H-3-oxa)-perfluorotridecyl]-amide}-1,4,7,10-tetraazacyclododecane, gadolinium complex -- 1,4,7-Tris(carboxylatomethyl)-10-{(3-aza-4-oxo-hexan-5-ylic)-acid-N-5-hydroxy-3-oxa-pentyl)-N-(1H,1H,2H,2H,4H,4H,5H,5H-3-oxa)-perfluorotridecyl]-amide}-1,4,7,10-tetraazacyclododecane, gadolinium complex -- 1,4,7-Tris(carboxylatomethyl)-10-{(3-aza-4-oxo-hexan-5-ylic)-acid-[N-3,6,9,15-tetraoxa-12-aza-15-oxo-C17-C26-hepta-decafluoro)hexacosyl]-amide}-1,4,7, 10-tetraazacyclododecane, gadolinium complex -- 1,4,7-Tris(carboxylatomethyl)-10-[(3-aza-4-oxo-hexan-5-ylic]-acid-N-(2-methoxyethyl)-N-( 1 H, 1H,2H,2H,4H,4H,5H,5H-3-oxa)-perfluorotridecyl]-amide}-1,4,7,10-tetraazacyclododecane, gadolinium complex.

30. Use according to one of claims 1 to 7, wherein as perfluoroalkyl-containing metal complexes, the compounds with sugar radicals of general formula Ic in which R represents a mono- or oligosaccharide radical bonded by the 1-OH- or 1-SH-position, RF is a perfluorinated, straight-chain or branched carbon chain with the formula -CnF2nE, in which E represents a terminal fluorine, chlorine, bromine, iodine or hydrogen atom, and n stands for numbers 4-30, K stands for a metal complex of general formula IIc, in which R1 means a hydrogen atom or a metal ion equivalent of atomic numbers 23-29, 42-or 58-70, provided that at least two R1 stand for metal ion equivalents, R2 and R3, independently of one another, represent hydrogen, C1-C7-alkyl, benzyl, phenyl, -CH2OH or -CH2OCH3, and U represents -C6H4-O-CH2-.omega., -(CH2)1-5-.omega., a phenylene group, -CH2-CH(CH2COOH)-C6H4-.omega., -C6H4-(OCH2CH2)0-1-N(CH2COOH)-CH2-.omega., or a C1-C12-alkylene group or C7-C12-C6H4-O group optionally interrupted by one or more oxygen atoms, 1 to 3 -NHCO groups or 1 to 3 -CONH groups and/or substituted with 1 to 3 -(CH2)0-5 COOH groups, whereby .omega. stands for the binding site to -CO-, or of general formula IIIc in which R1 has the above-mentioned meaning, R4 represents hydrogen or a metal ion equivalent mentioned under R1, and U1 represents -C6H4-O-CH2-.omega., whereby .omega.
means the binding site to -CO-, or of general formula IVc in which R1 and R2 have the above-mentioned meaning or of general formula VcA or VcB
in which R1 has the above-mentioned meaning, or of general formula VIc in which R1 has the above-mentioned meaning, or of general formula VIII
in which R1 has the above-mentioned meaning, and U1 represents -C6H4-O-CH2-.omega., whereby .omega. means the binding site to -CO-or of general formula VIIIc in which R1 has the above-mentioned meaning, and in radical K, optionally present free acid groups optionally can be present as salts of organic and/or inorganic bases or amino acids or amino acid amides, G for the case that K means metal complexes IIc to VIII represents a radical that is functionalized in at least three places and is selected from the following radicals a) to j) and G ~for the case that K means metal complex VIIIc represents a radical that is functionalized in at least three places and is selected from k) or l), whereby .alpha. means the binding site of G to complex K, .beta. is the binding site of G to radical Y, and .gamma. represents the binding site of G to radical Z, Y ~means -CH2, .delta.-(CH2)(1-5)CO-.beta., .beta.-(CH2)(1-5)CO-.delta., .delta.-CH2-CHOH-CO-.beta. or .delta.-CH(CHOH-CH2OH)-CHOH-CHOH-CO-.beta., whereby .delta. represents the binding site to sugar radical R, and .beta. is the binding site to radical G, Z ~stands for .gamma.-COCH2-N(C2H5)-SO2-.epsilon., .gamma.-COH2-O-(CH2)2-SO2-.epsilon., ~~~
or .gamma. - NHCH2CH2-O-CH2CH2-..xi.,~~
whereby .gamma. represents the binding site of Z to radical G, and .xi., means the binding site of Z to perfluorinated radical R F
and l 1, m 1, independently of one another, mean integer 1 or 2, and p1 means integers 1 to 4, are used.

31. Use according to claim 30, wherein the compounds of general formula Ic, in which R
represents a monosaccharide radical with 5 to 6 C atoms or its deoxy compound, preferably glucose, mannose or galactose, are used.

32. Use according to claim 30, wherein the compounds of general formula Ic, in which R2 and R3, independently of one another, mean hydrogen or C1-C4 alkyl and/or E
in formula -C n F2n E means a fluorine atom, are used.

33. Use according to claim 30, wherein the compounds of general formula Ic, in which G
represents lysine radical (a) or (b), are used.

34. Use according to claim 30, wherein the compounds of general formula Ic are used, in which Z means whereby .gamma. represents the binding site of Z to radical G, and .xi., means the binding site of Z to perfluorinated radical R F, and/or Y means .delta.-CH2CO-.beta., whereby .delta. represents the binding site to sugar radical R, and .beta. represents the binding site to radical G.

35. Use according to claim 30, wherein the compounds of general formula Ic, in which U
in metal complex K represents -CH2- or -C6H4-O-CH2-.omega., whereby .omega.
stands for the binding site to -CO-, are used.

36. Use according to claim 30, wherein the gadolinium complex of 6-N-[ 1,4,7-tris(carboxylatomethyl)-1,4,7,10-tetraazacyclododecane-10-N-(pentanoyl-3-aza-4-oxo-5-methyl-5-yl)]-2-N-[1-O-.alpha.-D-carbonylmethyl-mannopyranose]-L-lysine-[1-(4-perfluorooctylsulfonyl)-piperazine]-amide is used.

37. Use according to one of claims 1 to 7, wherein as perfluoroalkyl-containing metal complexes, the compounds with polar radicals of general formula Id in which R F is a perfluorinated, straight-chain or branched carbon chain with formula -C n F2n E, in which E represents a terminal fluorine, chlorine, bromine, iodine or hydrogen atom, and n stands for numbers 4-30, K ~stands for a metal complex of general formula IId, in which R1 ~means a hydrogen atom or a metal ion equivalent of atomic numbers 23-29, or 58-70, provided that at least two R1 stand for metal ion equivalents, R2 and R3, independently of one another, represent hydrogen, C1-C7 alkyl, benzyl, phenyl, -CH2OH or -CH2OCH3, and U ~represents -C6H4-O-CH2-.omega.-, -(CH2)1-5-.omega., a phenylene group, -CH2-CH(CH2COOH)-C6H4-.omega.-, -C6H4-(OCH2CH2)0-1-N(CH2COOH)-CH2-.omega., or a C1-C12 alkylene group or C7-C12-C6H4-O group optionally interrupted by one or more oxygen atoms, 1 to 3 -NHCO groups, 1 to 3 -CONH groups and/or substituted with 1 to 3 -(CH2)0-5COOH groups, whereby .omega. stands for the binding site to -CO-, or of general formula IIId in which R1 has the above-mentioned meaning, R4 represents hydrogen or a metal ion equivalent mentioned under R1, and U1 represents -C6H4-O-CH2-.omega.-, whereby .omega.
means the binding site to -CO-, or of general formula IVd in which R1 and R2 have the above-mentioned meaning, or of general formula VdA or VdB

in which R1 has the above-mentioned meaning, or of general formula VId in which R1 has the above-mentioned meaning, or of general formula VIId in which R1 has the above-mentioned meaning, and U1 represents -C6H4-O-CH2-.omega.-, whereby .omega. means the binding site to -CO-, and in radical K, optionally present free acid groups optionally can be present as salts of organic and/or inorganic bases or amino acids or amino acid amides, G represents a radical that is functionalized in at least three places and is selected from the following radicals a) to i) whereby .alpha. means the binding site of G to complex K, .beta. is the binding site of G to radical R, and .gamma. represents the binding site of G to radical Z
Z stands for .gamma.-C(O)CH2O(CH2)2-.epsilon., whereby .gamma. represents the binding site of Z to radical G, and .xi. means the binding site of Z to perfluorinated radical R f, R~represents a polar radical that is selected from complexes K of general formulas IId to VIId, whereby R1 here means a hydrogen atom or a metal ion equivalent of atomic numbers 20, 23-29, 42-46 or 58-70, and radicals R2, R3, R4, U and U1 have the above-indicated meaning, or R ~means the folic acid radical or R ~means a carbon chain with 2-30 C atoms that is bonded to radical G via -CO-or SO2- or a direct bond to radical G, and is straight or branched, saturated or unsaturated, optionally interrupted by 1-10 oxygen atoms, 1-5 -NHCO groups, 1--CONH groups, 1-2 sulfur atoms, 1-5 -NH groups or 1-2 phenylene groups, which optionally can be substituted with 1-2 OH groups, 1-2 NH2 groups, 1-2 -COOH groups, or 1-2 -SO3H groups, or optionally substituted with 1-8 OH groups, 1-5 -COOH groups, 1-2 SO3H groups, 1-5 NH2 groups, or 1-5 C1-C4 alkoxy groups, and l1, m1, p2, independently of one another, mean integer 1 or 2, are used.

38. Use according to claim 37, wherein the compounds of general formula Id, in which K
stands for a metal complex of general formula IId, IIId, VdB or VIId, are used.

39. Use according to claim 37, wherein the compounds of general formula Id, in which polar radical R has the meaning of complex K, preferably complex K of general formulas IId, IIId, VdA or VIId, are used.

40. Use according to claim 37, wherein the compounds of general formula Id, in which polar radical R has the following meanings:
-C(O)CH2CH2SO3H
-C(O)CH2OCH2CH2OCH2CH2OH
-C(O)CH2OCH2CH2OH
-C(O)CH2OCH2CH(OH)CH2OH
-C(4)CH2NH-C(O)CH2COOH
-C(O)CH2CH(OH)CH2OH
-C(O)CH2OCH2COOH

-C(O)-C6H3-(m-COOH)2 -C(O)CH2O(CH2)2-C6H3-(m-COOH)2 -C(O)CH2O-C6H4-m-SO3H
-C(O)CH2NHC(O)CH2NHC(O)CH2C3CH2COOH
-C(O)CH2OCH2CH2OCH2COOH
-C(O)CH2OCH2CH(OH)CH2O-CH2CH2OH
-C(O)CH2OCH2CH(OH)CH2OCH2-CH(OH)-CH2OH
-C(O)CH2SO3H
-C(O)CH2CH2COOH
-C(O)CH(OH)CH(OH)CH2OH
-C(O)CH2O[(CH2)2O]1-9-CH3 -C(O)CH2O[(CH2)2O]1-9)-H
-C(O)CH2OCH(CH2OH)2 -C(O)CH2OCH(CH2OCH2COOH)2 -C(O)-C6H3-(m-OCH2COOH)2 -CO-CH2O-(CH2)2O(CH2)2O-(CH2)2O(CH2)2OCH3 preferably -C(O)CH2O[(CH2)2O]4-CH3 are used.

41. Use according to claim 37, wherein the compounds of general formula Id, in which polar radical R is the folic acid radical, are used.

42. Use according to claim 37, wherein the compounds of general formula Id, in which G

84~

represents lysine radical (a) or (b), are used.

43. Use according to claim 37, wherein the compounds of general formula Id, in which U
represents group -CH2- or -C6H4-O-CH2-.omega. in metal complex K, whereby w stands for the binding site to -CO-, are used.

44. Use according to one of claims 37-43, wherein the gadolinium complex of 2,6-N,N'-bis[1,4,7-tris(carboxylatomethyl)-1,4,7,10-tetraazacyclododecane-10-(pentanoyl-3-aza-4-oxo-5-methyl-5-yl)]-lysine-[1-(4-perfluorooctylsulfonyl-piperazine]-amide is used.

45. Use according to one of claims 1-7, wherein as perfluoroalkyl-containing metal complexes, galenical formulations that contain paramagnetic, perfluoroalkyl-containing metal complexes of general formulas I, Ia, Ib, Ic and/or Id and diamagnetic perfluoroalkyl-containing substances, preferably dissolved in an aqueous solvent, are used.

46. Use according to claim 45, wherein as diamagnetic perfluoroalkyl-containing substances, those of general formula XX
R F-L2-B2~~ (XX) in which R F represents a straight-chain or branched perfluoroalkyl radical with 4 to 30 carbon atoms, L2 stands for a linker, and B2 stands for a hydrophilic group, are used.

47. Use according to claim 46, wherein linker L2 is a direct bond, an -SO2 group, or a straight-chain or branched carbon chain with up to 20 carbon atoms, which can be substituted with one or more -OH, -COO-, or -SO3 groups and/or optionally contains one or more -O-, -S-, -CO-, -CONH-, -NHCO-, -CONR9-, -NR9CO-, -SO2-, -PO4- -, -NH- or -NR9 groups, an aryl ring or a piperazine, whereby R9 stands for a C1-to C20-alkyl radical, which in turn can contain one or more O atoms, and/or can be substituted with -COO- or SO3 groups.

48. Use according to claim 46, wherein hydrophilic group B2 is a mono- or disaccharide, one or more adjacent -COO- or -SO3 groups, a dicarboxylic acid, an isophthalic acid, a picolinic acid, a benzenesulfonic acid, a tetrahydropyrandicarboxylic acid, a 2,6-pyridinedicarboxylic acid, a quaternary ammonium ion, an aminopolycarboxylic acid, an aminodipolyethylene glycolsulfonic acid, an aminopolyethylene glycol group, an SO2-(CH2)2-OH
group, a polyhydroxyalkyl chain with at least two hydroxyl groups or one or more polyethylene glycol chains with at least two glycol units, whereby the polyethylene glycol chains are terminated by an -OH or -OCH3 group.

49. Use according to claim 45, wherein as diamagnetic perfluoroalkyl-containing substances, conjugates that consist of .alpha.-, .beta.- or .gamma.-cyclodextrin and compounds of general formula XXII:
A1-L3-R F ~~ (XXII) in which A2 stands for an adamantane, biphenyl or anthracene molecule, L3 stands for a linker, and R F stands for a straight-chain or branched perfluoroalkyl radical with 4 to 30 carbon atoms, and whereby linker L3 is a straight-chain hydrocarbon chain with 1 to 20 carbon atoms, which can be interrupted by one or more oxygen atoms, one or more CO-, SO2-, CONH-, NHCO-, CONR10-, NR10CO-, NH- or NR10 groups or a piperazine, whereby R10 is a C1-C5 alkyl radical, are used.

50. Use according to claim 45, wherein as diamagnetic perfluoroalkyl-containing substances, those of general formula XXI:~~
R F-X1 ~~~(XXI) in which R F represents a straight-chain or branched perfluoroalkyl radical with 4 to 30 carbon atoms, and X1 is a radical that is selected from the group of the following radicals (n in this case is a number between 1 and 10), are used: