JPH05505454A - resonant cavity for NMR - Google Patents

Abstract

(57) [Summary] This bulletin contains application data before electronic filing, so abstract data is not recorded.

Description

[Detailed description of the invention] Before proceeding, we need to consider the transpose matrix for a particular circuit section.

For a π section, in contrast to Figure 1a, whereas for a T section, As shown in Fig. 1b.

A　l　l=　Azz　z, that is, if it has a symmetric section, In this case, we know that the characteristic impedance of section Z0 is given by the following equation: It is easier to show.

Zo”=A+x/Az+ (15) Using the invariance of TrA along with Equations 7a, 7b and 8, the transposed matrix, Equations 13 and It can be seen that 14 can be generally written as:

This equation can also be derived from the matrix S as follows.

Here matrix:,S-1! ;! It is given by:

Using S, we can see the following:

And if you invert this For a lossless transmission line with N sections corresponding to wavelength P (P integer) Therefore, Equation 20 shows that the phase relationship along the line satisfies the following relational expression: There is.

Nβ-2πMP (21) where β is the phase shift per cefushirane and M (integer) is the resonance mode. .

Using this formula, we can define the unit (p=1) ring transmission line that forms the basis of the petal resonator. have been designed [Mansfield, Bee, J., Phys., D., 2 1. 1643-4 (1988)), other related structures are chain mail coils and wires or necklaces useful for studying This is what has been called a space resonator.

In these designs, the electrical current in a continuous transmission line element around a cylindrical surface is The flow distribution follows a cosine or sinusoidal variation as a function of the cylinder azimuth angle θ parallel to the cylinder axis. In the case of a straight wire that exists on the surface of a cylinder, the cosine is expressed by the flow distribution along the cylinder axis. A uniform magnetic field transverse to the magnetic field is generated. This means that these straight wires are Forms the impedance element Z1 in the figure and the voltage around this line drives This applies when following a cosine change around a point. In this case, the nth wire The current flowing through is expressed as:

I,,,=E,,/Z, (22) This current is E. Accordingly, while I, , Equations ], 3 and 16 are for the lossless line case. The total value changes as 5inNβ.

In NMR imaging applications, a coil structure that generates a uniform transverse magnetic field is used as a transmitter. Useful as a coil and as a receiver coil. We also developed a multi-turn resonator structure. Note also that the structure is possible for P>1.

input impedance Having a formula for the human power impedance of the device is to set up a cavity resonator. It is useful for measuring This, along with Equations 1 and 3, translates to N-element transmission line Equation 2 This can be obtained by first considering the formula for 0. Input and output voltage and current Suppose that they are V+, It and Vz, It, respectively. Then we get the following formula:

V, =V! coshN r + hZ + 5inh N y (23a) as well as 1 + = (Vz/Zo) 5inhN 7+ I x coshNr (2 3b) Therefore, the input impedance is Z+ = V+ /I, this line be terminated by Zz-Vz/L. Substituting into the above equation, we can continuously divide We obtain a formula for Z, for individual lines, similar to the well-known result for clothed lines. Ru. That is, For an open circuit line of wavelength P, L=ω. In this case, Z, -L /1a nhNr (25a) This is for small argument NT z, two Z, /Nr (25b) becomes.

The impedance of an open circuit Pλ changes when its output is connected to its input. It is worth pointing out that this does not change. This applies to all resonator designs herein. is physically annular or high impedance point where is actually joined from head to tail. It means that it is cut at . The annular boundary conditions are equal in both cases. We also assume that 2Zl is relative to the π or T section as shown in Fig. 1. Point out that it will be developed as follows. The actual circuit constructed will be shown in the high frequency program that follows. As discussed with reference to the lobe, it is symmetrical about the earth point.

Q of cavity resonator For the Q of the cavity, substitute T=α+iβ, and in the case of Pλ line, Nβ at resonance. −2π By noting that tanhNzN a + 2 x δω/ω (26), can be found from Equation 25.

By using this approximation of equation 25a, we have 2Nα=4πδω/ω=2π /Q　Z for δω having the line width on the back of the hand given when (27) Note that this results in a Lorentzian change of l.

At resonance, the input resistance is R-Z. /Nα (28) becomes.

Combining equations 27 and 28, we obtain the following equation for Q:

Q′″πR/Z・(29) Single star resonator design low range 2+-2/. +ωC and L = (JωL+r), for this π section The transposed matrix for is given by:

From equations 10 and 30, we have T rA=2 − (ω/ωe)” when r=o. It turns out that =2 cowβ (31), here ω. ”-1/L C. (32) When we program this transcendental formula, we get the following for this low-pass filter section: The permissible frequency characteristics indicated by diagonal lines are given.

Combining Equations 21 and 31, we have the input and has a fixed length looped back to itself so that the output terminal is joined. The conditions for a supported rising wave in a resonant annular structure containing a line are: It can be seen that it is given in the second part below.

(ω/ωo)” = 43in” (πMP/N) (33) However, l≦MP≦N /2 is the case. The solution to No. 233 is that the mode frequency is the lowest mode from M=1 to the cassette. It is shown that the off-mode increases to M=N/2P.

as we also expected α−r (C/L)l/f/2=r/2Zo and β=ω/ω. (34) I understand that.

In this case, we obtain the following relation:

R-2 2-”/N r. (35) From equations 27 and 35, we also obtain the Q value.

Q=2xZ. /Nr (36) That is, this Q is obtained by the characteristics of a single cefsilane resistor.

High range line In this configuration, Z+ = 2 (jL+r) and Zl-t/jωc. Ru.

With these parameters we find that for r=0:

((+7＠　/ω”　)　-4sin lid IMP/N)　(37) Low frequency section As in the case of Z. − (L/C)”, including loss Even when you are caught, a=4 (r/2 Ze) sin” (tMP/N) and β- a) @ / ω (38a) For small β, this is The Q is Q=NZo/2 x r (38b).

In the “birdcage” resonator design (Hayes et al., 1985), a series of π sections Zt is considered to be inductive, while ZI is an inductor in series. Contains capacitors and capacitors. This means that circuits with many elements can be Structural disadvantage insofar as it requires many bulky high voltage capacitors for tuning has.

Todorokihazudannibu Miniaturizing RF probes for high frequency operation is all about size. can be problematic as it is often limited by the use of Ru.

In this project, we have applications in RF frequencies centered on 500MHz and above. new tunable RF that can scale and adapt to lower frequencies. A cavity design is introduced.

This RF cavity design is powered by a microwave magnetron cavity resonator. Exhibited. This is similar to the birdcage resonator (Hayes et al., 1985), but mechanically It has the advantage that it can be precisely fabricated from engineered solid copper and bar. our technique The theoretical basis of the technique is as given above.

The resonators are each connected by several rod inductors 30 as shown in FIG. Two end plates with symmetrical clusters of slotted loop resonators 20 combined It consists of 10 parts. A plan view of one end plate is shown in Figure 4a. Ru. In a particular embodiment, each slotted loop resonator 20 is 10 mm in diameter. The gap corresponds to the inductance of LlnH and the capacitance of 12 pF. 40, giving a resonant frequency of 438 MHz. leadless tip 0 alternative end that can also increase gap capacitance using a capacitor A partial ring arrangement 10' is shown in Figure 4b. This results in a larger axial access is provided.

In the configuration of Figure 4b, the end ring includes an annulus 10', which has a slot Or it has a loop resonator 20' with a gap 40'. This ring is the inner surface 4 1 and an outer surface 42, between which a circular aber chair 20' is formed. Ru. A loft 30' is joined to one end surface 43 at an intermediate location of the resonator 20'. ing. The second end surface 44 has a second series of slots 45 directed toward the first end surface. 4(d), thereby providing bundle guidance or Contains a sleeve.

To prevent induced cambling in these slotted loop resonators, bundle induction slides are A tube or end ring ferrule 50 can be mounted on top of each end ring 10. Ru. Such a sleeve configuration is shown in Figure 4d. This is two short coaxial conductors The inner cylinder 12 includes a series of conductive metal spacers. or held centrally within the outer cylinder by fins 13. fin 13 The arrangement is such that it engages within the slot 14 between the slotted loop resonators of Figure 4b. It is composed of These slots 14 also have fins 13 and bundle guiding rings 11 .

12 must also be insulated from contact with the resonator 10 of FIG. 4b. suitable The insulation material can be electrical tape or run. With this configuration or similar configuration , the magnetic flux from one slotted loop resonator 20' is transmitted to the other slotted loop resonator 20'. This prevents it from coupling with the vibrator. Between the end rings 11 and 12 of the ferrule 50 Assuming that the annular space is large enough, each slotted loop resonator 20 has a bundle A return path is given, which brings its self-inductance close to the unscreened value. I will maintain it so that it becomes so.

Individual slotted loop resonators are characterized by being shaped by drilling holes in a copper block. was experimentally evaluated by measuring the inductance of a single loop made ．． The inductance versus hole diameter is plotted in Figure 5. The complete coil will resonate over a range of frequencies centered around 500MHz. Ru. Tuning in this design also includes one end plate along the rod inductor. This can be done manually by sliding. Equivalent times for this resonator coil The path is shown in FIG. 6a with A and B joined.

Allowed frequency characteristics for one section of this circuit (r 1−=r2= O) is indicated by diagonal lines in Figure 6b. Stop bandwidth frequency is parallel resonant element See below.

From the circuit parameters of Figure 6a and the above analysis for rl=r:2-0, The resonant angular frequency ω of the cavity (when driven correctly) is ω”: (1) z” [ +Lz / 4L+sin” (tM/N)) (39) given by It turns out that

For the dominant mode, M=1, and for N=5 secnogons, this formula becomes (Ll” = ωz” (l + Lx / Lll (40a), where -m- ω! "= 1 / L 2 C = 4 K "fz" and rod inductor Ll=kl, where k is a constant and l is the length of the lot. this By substitution, equation (40a) becomes 11=f,! f1+(Lx/kl)+(40b), where r is key cavity frequency. Mutual inductance generally occurs between these rods. However, it is small and therefore ignored in this application.

From equations 14 and 15, if ω/ω2〉1, we have Z, : (L 1/C)” It turns out that. The resistance loss in the cavity basically occurs in the rod. , this is a sun allowance because the end plates are machined from solid copper. This is a simple assumption, but r2=0, and in this case, if ω/ω2〉1, a=　(r l/2 Zo) (ωz/ω)” (41a).

However, if r1=0 and the loss occurs in the slotted loop resonator, If so, we α-[rz/2Zol(L+/Lx) (1+(L+/Lz) l(ωz/ω )” (41b).

In both cases β=ω1/ω.

result Measurements of the resonant frequency for the main mode (M-1) were made for different cavity lengths. It turns out that the resonant behavior of the tora-phase helical coil follows the theory when properly driven. This suggests that the mutual induction effect between cefushiran can be ignored in this case. This supports our initial hypothesis. The coil is placed in balanced mode as outlined below. and is driven from one end. N slotted loop resonators and N slotted loop resonators In the case of inductance, the N/2 resonance mode is observed.

circuit drive The cavity traverses AB or A'B' through the split capacitor configuration of Figure 4c. can be most easily driven from one end plate of FIG. 4a. The center point is coaxial drive is connected to A or C (alternative drive and connection points are ), one capacitor of zcd is added to ensure proper balance. It should span corresponding points on the other end of the cavity. cavite The second power of the frequency r is plotted for 171 in Figure 7 according to the linear regression of Equation 40b. has been cut. The intercept at the origin is for the fundamental frequency f t = 424 MHz Give the experimental value.

These data are also plotted as f versus 1 in FIG.

By using these measurement parameters, a theoretical curve (solid line) can be drawn. Ru.

When the input drive is connected to point A as in Figure 4a, an anti-node or high voltage point is formed. It is also noted that Apart from the RF carrier phase shift, the rod current is According to the plate voltage, see equation 22, the driving point is therefore 0 point B, which corresponds to the code, has an opposite RF phase. additional capacitance Cd/2 is distributed around all slotted roof resonators, which allows Create an additional slotted loop capacitance of Cd/2　N. This is it The fundamental frequency f! in Equation 40b and FIG. is affected. This behavior is experimental is confirmed. This can therefore be used as a fine adjustment of the tuning of the cavity.

Alternatively, the cavity length 1 can be reduced to restore the desired operating frequency. .

At 500MHz, the Q of the coil is approximately 160 and the cavity length is 4.0c. From equation 40b, which was m, we have Ll-7,48nH, which makes the unique From Equation 29, which infers that impedance Zo = 22.3Ω, the input The resistance is R-1135Ω. 6.8 in Figure 4c where the cavity is Cd-3pF It was matched to 50Ω with a PF variable matching capacitor Cm. Taking Cd into account , the theoretical slotted loop resonant frequency agrees with the measured value from Figure 7. 429M) becomes I2.

We assume that for an end plate drive configuration where the input impedance ZI is between points A and C is correct, but emphasize that it is four times larger in equilibrium driving across A and B. . In the case of a slotted loop cavity resonator, the drive circuit of FIG. The predetermined value is predetermined by an additional distributed capacitance Cd/2N introduced into the loop resonator. In the expected state, I2 has two effects. The driving capacitance is the effect on 20 of Equation 15. This allows Zl to change to this extent in a predictable manner.

Designed by Daisodo Etaka and Tenno An alternative low frequency cavity design whose end plate cross-section is shown in FIG. In the slotted loop capacitance, a split guard ring 21 is added. It increases due to this. Alternatively, use an actual small capacitor 2 between the loop slots 2 may be inserted.

In another configuration, the loop inductance is machined into the end plate 10. ．． 10' by slightly shifting and superimposing them as shown in the schematic diagram in Figure 10. increase In this configuration, successive layers of inductance are placed in series as directed. must be effectively coupled to the continuous loop displacement so that it does not block the hole. The second 10' and successive layers of loops must be properly stretched in order to achieve this.

All the configurations we have discussed so far show that the rising wave around the transmission line structure is is the phase shift per section, N is the number of sections, and M and A “single-turn” cavity following a phase correlation of Nβ−2πMP, where and P are integers. It is. For the λ line, the operating frequency P=1. The main mode M=1 is This means that there is a phase shift of 2π radians. However, the same For frequency P-2, this results in a two-turn structure as schematically shown in FIG. It means construction. This configuration doubles the RF field per unit current at the center of the coil. and thus create a resonator impedance through the mutual coupling of the inductive elements. provides a means to effectively increase the End for two-turn cavity resonator A schematic diagram of a portion of the plate configuration is shown in FIG.

All previous induction loops have been flat, lying in the plane of the end plate, or In an end ring configuration. However, in the alternative configuration of the loop these are the 13th It can be rotated 90' from the plate plane as shown. In this configuration, the loop flux forms a toroidal shape, which is effective within the torus for a large number of elements. effectively included. These loops give virtually no mutual inductance They must be well spaced or a bundle guiding plate can be introduced to separate them. The loops can also be separated magnetically.

In another modification of the cavity resonator, the equivalent π circuit per section of Fig. 1a includes the inductor for Z2 and the capacitor in series with the inductor for Zl. I'm here. This gives a high frequency transmission line section, in this case the cavity The end plates are manufactured as split rings joined by rod inductors. be able to. One end plate is shown in FIG. Each segment 6 0 is machined from a solid block and space 70 is a series capacitor recess. forming a group. These segments may be suitably spaced apart by dielectric material.

The above arrangement may be further modified as shown in Figure 15a. Here, Locking inductance can be increased by forming a slotted loop.

The equivalent circuit for this configuration is shown in Figure 15b. When C is small, wide strip By having lots (1! fl and C-0), this equivalent circuit is shown in Figure 14. Reduce to the equivalent circuit of the case.

2,223 degrees of ball In certain situations, the cavity resonator may be surrounded by an RF screening can. , it is desirable to make the characteristics of the resonator independent from the surrounding metal structure. There is. The effect of this can is to reduce the rod inductance and to The idea is to introduce a stray capacitance C1 that creates a shunt. This parallel capacitor can be easily incorporated into theory. This net effect is The objective is to increase the operating frequency f relative to the tee length. The magnitude of this effect is Depends on screen approximation. When the screen/cavity diameter ratio is 1.25 , the frequency change is around 15%. This increases the cavity length or increases Cd which decreases I2 as outlined in the explanation of circuit drive. It can be repaired by

Bunsōgei Shinkioka Kei All of the resonator coil designs described so far completely envelop the specimen around the cylindrical axis. It has a cage-like structure. However, it does not provide easy access to the specimen. There are some cases where it is more convenient to have a split coil system that provides . Such a configuration is suitable for very small specimens and for easy access to limbs, torso, head, etc. It is also desirable for imaging for access.

Such a new split resonator coil configuration is shown schematically in FIG. Here, − As an example, we simply place in close proximity to a large grounded conductive metal sheet 102. We only take half-cavity arrays 100 that are connected but not necessarily in contact.

When the four corners of the half-basket are grounded, two λ/4 risers center around the driving point. A rippling wave occurs. Due to the particular symmetry of the resonator wire, there is a balanced magnetic field on the surface of the conductor. The field doubles and the induced image flowing through the sheet becomes uniform due to the flow. magnetic Physically and electrically, this configuration behaves like a heavy cylindrical resonator as previously described. This is because the boundary conditions for open circuit/two lines are open circuit or circular line. This is because it is the same as in the case of However, in reality, coils are It can be lifted like a cheese plate cover for direct specimen access. Continuity Half cage coil design without plate is Baron, Dee 6. Graham, M0. Devi Tobee, L2. Caucha, Jieee, (Proc, Soc, Mag , Res, 8th Annual Medical Congress in Amsterdam 2951 (1989) ), but its value is low due to poor RF homogeneity and low signal response characteristics. The values are close.

The configuration schematically illustrated in FIG. 16 has a semicircular cross section. However, generally Generating a uniform transverse magnetic field in a semi-elliptical structure with ellipse axes 2a and 2b is possible. Such a configuration can be used as a head coil or as a foot or knee coil. It can be extremely convenient. Corners A and B are joined by internal return wire 104 can provide a continuous band of current paths around the end plate. can. Corners P and Q should be joined by wire 106 as well.

If the number of wires in the circular cage is reduced to 6, the coil structure is reduced to wires W, W 17a where l does not pass through the if flow, i.e. in a position corresponding to the wave node. This effectively changes the file configuration. If a reflective screen is introduced as in Figure 17b, Wires 1 and 4 form the ground, while wires 2 and 3 can be connected, but this This is because those currents are in the same phase. This configuration is shown schematically in Figure 18a. Ru. To force wires 1 and 4 into the node plane, the circuit should be the device must actually be in contact with the screen plate. If not, insert the current return path between points A and B and points P and Q as shown schematically. It can be arranged in the form of partial return wires 104', 106'. to another fix , this pair of wires is replaced by a single strip of copper wire in Figure 18b. and the rods 2 and 3 are combined in a flat conductive hole 12. in any case , this configuration is suitable for flat samples in either microscopy or whole-body imaging. Provides a removable coil system for easy pull.

The presence of the conducting plate serves to make this configuration symmetrical, thereby increasing the field. At the same time make it more uniform. This equivalent circuit and drive configuration is shown in Figure 18c. ing.

The alternative end plate design in Figure 4b is halved across its radius and this A split or single-resonant setup replacing the two half-end plates shown in Figure 16 by Make a meter. To eliminate the mutual inductance between the loops, the end loops in Figure 4d are The ring is also halved, which allows it to fit into the end ring of the beef bowl shaker. .

In the embodiments of FIGS. 16 and 18, the conductive sheet 102 is not a continuous sheet. is preferred, but a plurality of strips as shown by dashed line 102' in FIG. may include. This can only be done to satisfy the boundary conditions for the RF current. could also be caused by the switched gradient used in NMR. This is to block other induced currents at lower frequencies.

These strips are made by starting from a continuous sheet and slitting it at appropriate distances. An alternative configuration can be formed by converting the sheet into a continuous conductive sheet in other conditions. cut into a flat loop with an appropriate shape that follows the guided RFil flow contour. Contains.

In another embodiment, the passive conductive sheet is an inductive screen in a flat passive conductive sheet. Actively driven flat plate with current applied to simulate current Replaced by wire array.

Using the matrix method we developed a cavity resonator NMR operating at 500 MHz. An advanced analysis of the coil design reveals the mutual induction effects between transmission line sections. ignore. The experimental results obtained for the resonator coil provide a theoretical basis for the fundamental mode. Book (content & ζ unchanged) L(nH) Special table 15-505454 (8) f2 (MHz) 2x 105 Fig, 10b Notice of translation of written amendment (Article 184-8 of the Patent Act) February 12, 1992 1. Display of patent application PCT/GB90101259 2. Name of the invention resonant cavity for NMR 3. Patent applicant Address: Nised 6B, London, UK.

Newington Causeway 101 Name British Technology ・Group BLC4, Agent Address: Shin-Otemachi Building, 206-ku, 2-2-1 Otemachi, Chiyoda-ku, Tokyo Phone: 3270-6641~6646 6. List of attached documents (1) Translations of amendments: 24 translations in 2 copies; additional work completed) 34 Supplementary engravings (contents No change) [English Civilization Book, page 2] The present invention is a resonant array for NMR used at high frequencies, comprising: The array includes two equivalent end structures and a plurality of end structures joining these equivalent end structures. Contains continuous rods that form multiple π or T electrical circuit sections However, the continuous rod is made of a conductive material, so that the continuous rod is The end structures are supported at a predetermined distance apart, and the end structures support all of the arrays. The structure substantially contributes to the electrical characteristics of the body and the structure can support rising waves. Provided is a resonant array shaped and dimensioned to allow It is something to do.

The present invention also provides that the first and 20th nodes are combined in a flat rectangular sort. and the third and fortieth rods are combined in a conductive wire surrounding said sheet. The present invention provides a modified resonant array.

Embodiments of the invention will be described below by way of example with reference to the accompanying drawings, which In, Figure 1 shows the overall parameters for (a) π section and (b) T section. Figure 2 shows a simple low-pass filter transmission line. It shows a graph showing the allowed frequency response for the FIG. 3 shows a slotted loop resonator with an effective cavity length of 1 according to the present invention. Figure 4a shows a tunable NMR cavity containing a cluster of Figure 4b shows one end plate of the i1 NMR cavity; shows an alternate end plate design with easy axial access; [English Civilization Book, page 31] The scope of the claims 1. In a resonant array for NMR used at high frequencies, the array has two including two equivalent end structures and a plurality of continuous rods joining said equivalent end structures. This constitutes a plurality of π or T electrical circuit sections, and the continuous blocks described above are the continuous rod is made of a conductive material, and the continuous rod thereby extends the end structure by a predetermined distance i1. [The end structure is supported between so as to substantially contribute and such that the electrical characteristics are capable of supporting rising waves. A resonator for NMR characterized in that it is shaped and dimensioned to Ray.

2. The method of claim 1, wherein each end structure includes a machined plate. Resonance array for NMR.

3. Each end plate is a substantially circular disk, the surface of said disk being includes a disk with circular apertures spaced equidistantly apart on the top, each aperture A connects one end of the extension channel extending into the common central area of said plate to it. the other end of each extension channel forming a central aperture. and one of each of the plurality of continuous rods is connected to each drawing channel. connected to the plate at a position 1 intermediate between the channels to form the array; The resonant array according to claim 2, characterized in that:

4. The rod is connected to one end plate by a plurality of through holes in the end plate. each rod is connected to its respective end plate in said end plate. is slidable in the hole, thereby allowing the separation distance tIw of the end plates. 3. The resonant array according to claim 2, wherein the resonant array is capable of resonating.

5. Each end plate is physiological and has an interior defined by the thickness of said physiological and a saline having an external cylindrical surface and first and second ends defined by a width of said saline; the surface includes a circular hole passing through the hole from the inner surface to the outer surface; A plurality of circular apertures equidistantly spaced around its surface to provide The physiology also includes bonding each circular aperture to the first end surface. the plurality of first slots and the circular aperture to partially separate the plurality of first slots and the circular aperture; Formed in one direction from the surface of the second welded portion toward the surface of the first end portion. A plurality of second slots are arranged, and each of the plurality of rods has a plurality of second slots. the first end surface at each location between the first slots; and that the rods are spaced equidistantly around the ring. 3. The surface array of claim 2, characterized in that:

6. Includes a bundle guiding sleeve, and the east guiding sleeve includes an inner ring and an outer ring. and the inner ring has a smaller diameter than the ring, and the outer ring has a smaller diameter than the ring. Having a large diameter, the inner and outer rings are connected together by a series of fins. and the fins and the inner and outer rings are electrically conductive, and the fins are electrically conductive. are spaced apart at intervals around said ring, thereby making said second slot the bundle guiding sleeve is filled over each section. The resonant array according to claim 5, characterized in that:

7. said array comprising the first and twenty-seventh rays as claimed in claim 3; The 17th ray is larger than the 27th ray, and the 27th ray is larger than the 17th ray. A resonant array characterized in that it is arranged on the side.

8. each end plate includes a ring, said ring being comprised of a plurality of conductive segments; each segment is separated from its adjacent segment by an electrical insulator. This electrically isolates each segment, allowing each rod to connect to each segment. which space the rods equidistantly around the annulus. The resonant array according to claim 1, characterized in that:

9. Each end plate includes a half ring, each half ring having a plurality of circular apertures passing through it. perture and a plurality of circular apertures connecting each circular aperture to the outer surface of the half ring. Stretch channels are arranged, each respective rod has an adjacent circular aperture said rod is thereby joined to said half-ring at a position between said two two half-rings are joined to form a cheese plate configuration and include a conductive plate; Note that the plate configuration is placed on top of the conductive plate but not in contact with it. 3. The resonant array according to claim 2, wherein the resonant array comprises:

10. Each end structure includes a half ring, and the rod thereby joins each half ring. forming a cheese plate configuration, and including a conductive plate, the cheese plate configuration being Claim characterized in that the conductive plate is placed on top of, but not in contact with, the conductive plate. Item 2. Resonance array according to item 2.

11. Each end structure includes a partial support, and each partial support includes a first and a twentieth node. The 3rd and 40th nodes are close to the flat conductive note but are not electrically connected. placed on either side of the partial support at points 1 that are not in contact with the and the first and third and second and fortieth heads are located at each end of the opening and the opening. are electrically connected via their respective capacitors. 3. The resonant array according to claim 2.

12. The first and twentieth nodes are combined in a flat rectangular conductive inner sheet. The 3rd and 40th nodes are on the same plane as the sheet, but combined in a conductive wire that surrounds the sheet without contact The flat conductive plate carries the wire in the same plane as the wire. is shaped so as to surround the wire without electrically contacting it. 12. Modification of a resonant array according to claim 11.

Procedure supplementary city letter 1. Display of incident Q PCT/GB9ki101259 1990 Patent Application No. 512174 2. Name of the invention resonant cavity for NMR 3. Person who makes corrections Relationship to the incident: Patent applicant address Name: British Technology Group PLC 4. Agent Address: Shin-Otemachi Building, 206-ku, 2-2-1 Otemachi, Chiyoda-ku, Tokyo 5. Subject of correction (1) Translation procedure amendment for the description and claims that have been typewritten July 10th, 1992 Commissioner of the Patent Office Mr. Watari Aso 1 1990 Patent Application No. 512174 2. Name of the invention Name: British Technology Group PLC 4. Agent Address: Shin-Otemachi Building, 206-ku, 2-2-1 Otemachi, Chiyoda-ku, Tokyo 5. Subject of correction (1) Article 184 of the Patent Act, typewritten and submitted on February 12, 1992 6. Translation of the written amendment pursuant to Section 8, Contents of the amendment As per the attached sheet (note that there is no change in the content of the document in (1) above) international search report , *+wns+:wm+ ilem+. ,i-,,PCT/Yar90101259 international search report thil reference nl1m1llll+IMes+e++ll1m噸1vmmine11~bw *r-→alln@Isl1wssl#mdac++m1kaiPinj11Mself we-++tt+tllensliNdenshu-r! 1-kai+m5lNden*t’e% r111-Suzuki-ri.

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Claims (14)

[Claims] 1. In a resonant array for NMR used at high frequencies, the array has two including two equivalent end structures and a plurality of continuous rods joining said equivalent end structures. This constitutes a plurality of π or T electrical circuit sections, and the continuous blocks described above are the continuous rod is made of a conductive material, and the continuous rod thereby separates the end structure at a predetermined distance. A resonant array characterized in that the resonant array is supported between. 2. Claim 1, wherein each end structure includes a machined plate. Resonance array for NMR. 3. The end structure is a non-conductor with a discrete inductor or capacitor mounted on it. The resonance array for NMR according to claim 1, further comprising a conductive support. 4. each end plate being a substantially circular disk, the surface of said disk being includes a disk with circular apertures equidistantly spaced above each aperture; a is connected to one end of the drawn channel, and the other end of each drawn channel is connected to the the ends of which are connected to form a central aperture, and the plurality of One of each of the continuous rods is connected to the plate at a position intermediate between each drawing channel. 3. A resonator according to claim 2, wherein the resonant aperture is connected with a Ray. 5. The rod is connected by a plurality of through holes in the end plate. attached to the end plate, each lot having its are slidable in their respective holes, thereby adjusting the separation distance of the end plates. The resonant array according to claim 2, characterized in that it enables. 6. The above lot is connected to one end by multiple through holes in the non-conductive support. bonded to a non-conductive support, and each lot is bonded to its non-conductive support. is slidable within each hole, thereby adjusting the separation distance of the non-conductive supports. A resonant array according to claim 3, characterized in that it enables. 7. each end plate being an annulus with an interior and an exterior defined by the thickness of said annulus; an annulus having a cylindrical surface and first and second end surfaces defined by a width of the annulus; and said ring has a circular hole extending through said ring from said inner surface to said outer surface. A plurality of circular apertures are arranged equidistantly around the surface and are The ring also includes a plurality of first circular apertures joining each circular aperture to the first end surface. the second end surface to partially separate the slot and the circular aperture; a plurality of second slots formed in one ring toward the first end surface; and each rod of the plurality of rods is inserted into the slot. The rod is connected to the ring at each position between the rings, and the rod is connected to the ring at each position between the rings. 3. The surface array of claim 2, wherein the surface array is equidistantly spaced apart. 8. a bundle guiding sleeve, said bundle guiding sleeve including an inner ring and an outer ring; and the inner ring has a smaller diameter than the ring, and the outer ring has a smaller diameter than the ring. Having a large diameter, the inner and outer rings are connected together by a series of fins. The fins and the ring are electrically conductive, and the fin has an electric conductor around the ring. The second slot is spaced apart by an interval, which allows it to operate in conjunction with the second slot. in such a way that the bundle guiding sleeve is filled over each ring. 8. The resonant array according to claim 7, wherein the resonant array comprises: 9. wherein said array comprises a first and a second array as claimed in claim 4; one array is larger than the second array, and the second array is larger than the first array. A resonant array characterized in that it is arranged on the side. 10. Each end plate includes an annulus, the annulus being comprised of a plurality of conductive segments. each segment is separated from its adjacent segment by an electrical insulator. This electrically isolates each segment, allowing each rod to which space the rods equidistantly apart around the ring. The resonant array according to claim 1, characterized in that: 11. Each end plate includes a half-ring, each half-ring having a plurality of holes and holes therethrough. and a plurality of slots connecting each hole to the outer surface of the half ring; Each respective rod is joined to the half ring at a location between adjacent holes and The rod thereby joins the two half-rings to form a cheese plate configuration, and a conductive plate, and the cheese plate configuration is disposed on the conductive plate. 3. The resonant array according to claim 2, wherein the two electrodes are not in contact with each other. 12. Each non-conducting support includes a half-ring, and the rods thereby connect each half-ring. together form a cheese plate configuration and include a conductive plate; is arranged on the conductive plate, but is not in contact with the conductive plate. A resonant array according to claim 3. 13. Each non-conducting support includes a partial support, each partial support having a first and a second support. Although the third and fourth rods are near the flat conductive sheet, placed on either side of the partial support in a position that is not in electrical contact. and the first and third rods and the second and fourth rods are located at each end of the rods. It is characterized by being electrically connected via each capacitor in the 4. The resonant array according to claim 3. 14. The first and second rods are assembled in a flat rectangular conductive inner sheet. The third and fourth rods are on the same plane as the sheet, but are attached to the sheet. combined in a conductive wire that surrounds the sheet without contact The flat conductive plate carries the wire in the same plane as the wire. is shaped so as to surround the wire without electrically contacting it. 14. The resonant array according to claim 13, characterized in that: