CN1146890A - Fixed septum collimator for electron beam tomography - Google Patents
Fixed septum collimator for electron beam tomography Download PDFInfo
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- CN1146890A CN1146890A CN 95103852 CN95103852A CN1146890A CN 1146890 A CN1146890 A CN 1146890A CN 95103852 CN95103852 CN 95103852 CN 95103852 A CN95103852 A CN 95103852A CN 1146890 A CN1146890 A CN 1146890A
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Abstract
An X-ray collimator which is useful in an electron beam computed tomography (CT) scanner consists of an X-ray blocking septum having an aperture therein, the septum being located in a fixed position substantially coplaner with the planes of the target and the detector, and a movable ring which has a longitudinal axis positioned coaxial with the axis of the aperture and an end face opposed to and parallel with the septum. This ring acts as a pre-collimation radiation shield. The tomographic slice width is varied, by moving the position where the electron beam impinges upon the width of the X-ray target and adjusting the spacing between the end face of the moveable ring and the septum.
Description
The present invention relates to a kind of X-ray collimator that the electron beam computerized tomography becomes the scanning phase device that is used for, particularly relate to fixed-site of a kind of usefulness and have the X-ray collimator that the X-alpha ray shield dividing plate of aperture forms on it.In a preferred embodiment, also be provided with one movably the ring, its longitudinal axis be arranged to dividing plate in aperture coaxial.
Become in phase (CT) scanning device at computer x-ray-tomography with scanning beam X-ray source, electron beam is offset by mangneto so that be roughly circular track rotation along one, at this moment electron beam is mapped on the annular antikathode, thereby forms the X-ray source of a rotation.After passing collimator, the X-ray forms a fladellum, and is tackled with the eclipsed annular linear transducer array of collimator by one.The United States Patent (USP) of nineteen eighty-two JIUYUE mandate on the 28th discloses a kind of like this electron-beam scanner 4,352, No. 021, and this scanning device is on sale on market, for example, and the product of south, California city of San Francisco Imatron company.For making X ray become straight line from annular antikathode emission, present collimator is to form by fixing first and second beckets that have definite distance therebetween on a plastic cylinder, and this distance has formed the X ray fladellum and determined a given amplitude limit width.Amplitude limit width for a change has different second group of becket of set a distance really therebetween and is set on another part of plastic cylinder, with first group spaced apart.In fact second group form a new collimator, and it replaces first collimator with the method for machinery.This substitutes by second group of ring being arranged on anticathode opposite and realizes, so that form new collimator.
Aforementioned existing collimator apparatus is the comparison costliness, this is because it organizes frame for movement and mechanical speed-control devices of collimators more, and these adjusting devices are essential for accurately adjusting on the relative position of corresponding collimation ring group with respect to antikathode ring and linear transducer array.Have again, the width of amplitude limit (or X ray fladellum) be by not on the same group the position of collimator interannular determined, because of rather than continuously adjustable.
Therefore, people are desirable to provide a kind of cheap collimator apparatus that electron beam (EB) computerized tomography becomes phase (CT) scanning device that is used for.
The more desirable collimator that provides a kind of like this cheapness, it has improved performance.
Be used to collimate the device of a mobile x-ray source, comprise the X ray shielded partitions of a fixed-site, it is at the x-ray source that moves and be used for interval between the linear transducer array of detecting x-ray.This dividing plate be provided with the plane parallel that limited with moving source substantially, thereby the interval is divided into antikathode part and probe segment, antikathode partly comprises mobile x-ray source and probe segment comprises the X ray linear transducer array.One aperture is arranged above the dividing plate, and a part of X ray arrives linear transducer array from radiographic source by aperture, thereby X ray is collimated.
Fig. 1 illustrates an electron beam computerized tomography that the collimator type is housed and becomes the scanning phase device, and this collimator (being shown in Fig. 3) principle according to the present invention is made;
Fig. 2 is the cross-sectional view of system shown in Figure 1;
Fig. 3 is the sketch map of details that is used for the collimator apparatus of the present invention of Fig. 1 system;
Fig. 4 a is the end-view of all parts of system shown in Figure 1, and the different projection of Fig. 4 b and 4c presentation graphs 4a is in order to the X ray shielding properties of the collimator of presentation graphs 3.
Fig. 5 a, Fig. 5 b and Fig. 5 c have illustrated the frame for movement feature of the collimator apparatus of Fig. 3 in more detail.
As shown in Figure 1, electron beam (EB) computerized tomography becomes phase (CT) scanning device to comprise three major parts: an electron beam scanning pipe 2, and it has a column part 4 and a half cone-shaped part 6; An X ray linear transducer array 8 and a computer system 10.Scanatron 2 produces and to an antikathode ring divergent bundle, this antikathode ring produces X ray under the bombardment of electron beam.X ray collimated and pass patient 11 after, tackled and detect by linear transducer array 8.Data collecting system (DAS) 10a of computer system 10 is delivered in the data output of linear transducer array.Computer system 10 comprises many disks 12 in order to write down resulting probe data and it is kept for subsequent treatment.Computer system 10 also comprises a scan control part 10b, and scanatron and a video display units 14 are being controlled in its output, to show the image that is become phase by computer system with the x-ray tomography that resulting probe data was reproduced.
Can scanning and offset system have been represented among the figure in more detail more accurately referring to Fig. 2.Scanatron 2 comprises a vacuum bubbles 20, at its column part 4 electron gun 22 is housed.Electron gun is along half cone-shaped part 6 emissions one electron beams 23.Focus coil 24 usefulness magnetic force are focused into a point with electron beam, are mapped on the semi-annular shape taper antikathode 26, and this anticathode location should make its longitudinal axis with scanatron 2 become 82 ° of angles.Meander coil 27 provides a magnetic field, thus so that the half cone-shaped part 6 of the crooked passage in transit scanatron at its directive antikathode 26 of electron beam.One group of corresponding cooling coil 28 can be embedded in the antikathode support 29, in order to cooling antikathode 26.
Meander coil 27 not only makes beam pulling as mentioned above, also makes it along antikathode ring 26 fast, strafe repeatedly, so that form an x-ray source that planar rotates basically.A collimator apparatus (being shown in Fig. 3,4 and 5) be placed in X-ray beam on the path between antikathode ring 26 and the linear transducer array 8, the X ray of penetrating from the antikathode environment-development with shielding, and form a X-ray beam with the plane fladellum form emission of 1 to 10 mm wide.A sector of fladellum is detected by the part of X ray linear transducer array 8, and measured value is sent to the DAS 10a of computer system 10 in order to reproduce the image that the X ray section becomes phase.Above-mentioned EBCT scanning system (except that the details of the collimator apparatus that below will give detailed description) is known for those people that understand this technology, and is commonly called the ULTRAFAST CT scan device that Imatron company makes and sells.Therefore, there is no need to be further described with regard to the structure of its fundamental system and operation and parts thereof.
Schematically shown in Fig. 3～5, the same section among these figure in each figure has used identical reference number to novel collimator.Design is the end face that closes on vacuum cone cavity 6 with, and the contiguous perhaps of equal valuely support set that includes linear transducer array 8 is provided with.X ray shielded partitions 300 with holes is the basis.Dividing plate is taked the form of apertured disk usually, it is set on antikathode 302 in the determined plane of x-ray source of moving and the interval between the X ray linear transducer array 8 determined planes and is parallel with it substantially, thereby the X ray that only passes its hole (being aperture) 304 arrives linear transducer array 8.That is to say that dividing plate 300, the x-ray source and the linear transducer array 8 that move are set in parallel basically, and spaced apart on antikathode 302, so that dividing plate 300 is in form an X ray barrier between x-ray source that moves on the antikathode 302 and linear transducer array 8.Preferably, these planes are accurately parallel, image fault is reduced to minimum.(notice that horizontal direction is 100 to 1 with the ratio of the scale of vertical in Fig. 3,4b and 4c, so that principle involved in the present invention more clearly is described.Right that should be noted that the distortion that this also causes some illustrated angular relationships, for example 82 ° of angles between the antianode 302 and the scanatron longitudinal axis).Dividing plate 300 is represented as at a Z=0 in the drawings in the face of the plane of X ray antikathode 302, i.e. the nominal starting point of scanning device axial path.Herein, the inboard root face of the aperture 304 of dividing plate 300 has been determined a plane in collimator gap 306.In a preferred embodiment, another plane in collimator gap 306 is determined by an end face 310 of an adjustable ring 308.The plane of end face 310 parallel substantially (preferably accurately parallel) is provided with in the antikathode side of dividing plate 300 (left surface among Fig. 3), and it is coaxial with the longitudinal axis of aperture 304 substantially to encircle 308 the longitudinal axis.In described embodiment, the diameter with aperture 304 is identical substantially for the external diameter of ring 308, yet this relation is a system design problem in itself.Therefore, observe from angle at the x-ray source of antikathode ring 302 rotation, encircle just 308 and dividing plate 300 between the interval determined the width in collimator gap 306 controlledly.Have, obviously illustrate as Fig. 3, ring 308 also plays a very important adjection, that is, as a radiation shield of protecting the patient of patient front, the patient only is subjected in fact forming the radiation of collimated telescope beam like this.In addition, ring 308 is also in order to scattering (it can reduce the quality of image) that reduces X ray and the uniformity of improving radiation dose distribution (shown in Fig. 4 b).Yet, should be noted that in another embodiment, the irradiation quantitative limitation suffered to the target of taking a picture is unessential, thereby although the shielding collimation ring 308 to X ray is desirable optional before collimation.In this case, useful ray beamwidth will depend on " ken " between antikathode 302 and the linear transducer array 8 fully, that is depend on the position+Z of electron beam bright spot on antikathode 302 width.The axial location Z of electron beam bright spot is adjustable, promptly by to the suitable adjustment of meander coil 27, the electron beam on the movable inclined antikathode 302 so that its near or away from dividing plate 300.When the electron beam bright spot moves to more close dividing plate 300, correspondingly reduce by " ken " of aperture 304 by antikathode 302 to linear transducer array 8, therefore correspondingly reduced the width of beam, so leniently arriving the extremely little amplitude limit width to 1mm of 10mm can realize with the cone angle of minimum and maximum efficient, as shown in Figure 3.Have, should be noted that, new collimator apparatus not only can simply be regulated to change the amplitude limit width, if desired, also can adjust at sweep phase, and not need mobile probe array or dividing plate.In addition, in a preferred embodiment, the adjustment of the axial location of electron beam bright spot is carried out simultaneously on the adjustment of collimation ring 308 and the antikathode, thereby keeps its advantage to patient's radiation shield.
As shown in Figure 3, for 6mm amplitude limit width, the electron beam bright spot position of optimizing is determined by " Z-ray " A, the right-hand member of its " 6mm " amplitude limit electron beam bright spot position (that is, the antikathode ring is apart from dividing plate 300 part farthest) from antikathode 302 via the left end (end face 310 by adjustable ring 308 is determined) in collimator gap 306 then near the right-hand member 312 (in probe one side of scan axis) of dividing plate aperture 304.Z-ray A can more clearly be found out by Fig. 4 c with respect to the route of end 312, will give explanation later on.(notice that use term " Z-ray " just for the ease of the description of the drawings, it is not a habitual technical term, neither a kind of novel radiation here.) as shown, Z-ray A, B, C and D are ultimate " Z-rays ", they have determined the radiation dose branch curve of a square X-beam bright spot profile.In fact, the position of electron beam bright spot is at one group and characteristic circle (radius R on the adjustment antikathode 302
SpShown in Fig. 4 a) tangent and leave that planar " Z ray " shown in Figure 3 carry out.Electron beam bright spot position and corresponding electronic beam radius are such functions on the antikathode, and they become with needed amplitude limit width.Different electronic beam radius derives from the 82 ° angles of antikathode 302 with respect to scanning device Z-axle.
Also be in this embodiment, an adjustable radiation shield 314 is placed on probe one side of dividing plate 300, and adjusted so that the scattered radiation minimum.This protective shield is as the collimator of patient back, and with regard to this function, its end face in the face of dividing plate 300 plays the effect of shielding X-ray fladellum, and its mode is similar to the end face 310 formed shieldings to the X-ray of collimation ring 308.In use, radiation shield 314 is adjusted to the position that just in time will touch Z-ray D towards dividing plate 300.If desired, radiation shield 314 also can be used to limit the amplitude limit width.The radiation shield 316 of a fixed position also is illustrated, and it is attached to probe one side of dividing plate 300.
Fig. 4 a is the sketch map of scanner stand front view, and it shows the relative position of antikathode, probe and collimation ring, and the radius of circle of explanation scanning simultaneously (R
Sc) and characteristic radius of circle (R
Sp).R
cAnd R
rRepresent collimator and anticathode radius respectively.Also show the Z-ray that is tangential on picture element P with the characteristic circle in addition.
Fig. 4 b is the projection of the geometry edge-Z direction of collimator system about the ray by picture element P.Notice that the drafting of Fig. 4 b just looks like that the both sides of collimator all are positioned at the zone that probe/antikathode overlaps, that is, the part of linear transducer array 8 and antikathode ring 302 overlap in this zone, i.e. regional " O ".Z-ray A, B, C and D are ultimate " Z-rays ", and these " Z-rays " define the radiation dose branch curve of a square X-beam bright spot profile b.As shown, X-beam bright spot is along the position of the radiant section b of antikathode ring 302, and collimation ring 308 has been determined the radiation dose distribution curve that the round P of going up of characteristic is ordered to the distance of stationary barrier 300.
Gap width 306 can go to select according to the simple geometric relation, to provide the amplitude limit width of required radiation on axis.The selection of block board thickness t should make its can provide the probe and dividing plate between with enough intervals to hold required radiation shield.As mentioned above, " Z-ray " A (at characteristic circle place) is in order to determine the needed geometrical condition of desirable amplitude limit width (electron beam bright spot position).
Fig. 4 c represents those leap scanning circles R
Sc" Z-ray " A, B, the C of ray and the exemplary trajectory located at the little pore radius of dividing plate (end 312) of dividing plate 300 probes one side of D.Go out as shown, at characteristic circle R
SpOutside, " Z-ray " A is shielded by dividing plate end 312.Can give visualization like this, that is, light beam of imagination is upwards penetrated by the X-beam bright spot b shown in Fig. 4 b, passes the collimator gap, thereby forms a light cone, and this cone has formed the style of the Z-ray that is mapped to linear transducer array 8.The planar part shown in Fig. 4 b that enters and leave of dividing plate has formed and has appeared at the pop one's head in curve shape of ray cone of a side of collimator.Fig. 4 c clearly show that this ray curve of each Z-ray A, B, C and D.Because this curve that forms because of the geometry of dividing plate 300 mesopores, thereby the radiation dose distribution curve is linear increasing from the position that antikathode 302 advances to linear transducer array 8 from the end of dividing plate to any position that the Z-ray no longer is mapped to collimation ring 308 or dividing plate 300 without hindrance.This condition is corresponding to those Z-rays between ray B and the C.Therefore, the radiation dose distribution curve on the scanning circle is trapezoidal, shown in Fig. 4 b and 4c.Shown in Fig. 4 c, the ray A beyond the characteristic circle is by baffle shield.It is hundred-percent condition in characteristic circle internal efficiency under for minimum situation that this selected structural form has satisfied at cone angle.At scanning circle place, the radiation dose of conductively-closed reaches maximum.Notice that Z-ray B, C and D can collimated device shieldings in any position.
Can find out obviously that by aforementioned each figure in area 0, promptly antikathode and linear transducer array overlapping areas can't be connected to dividing plate 300 on the scanning device shell with mechanical connection manner.Yet (top of Fig. 4 a) can get involved the collimator gap area (promptly in the zone that probe is only arranged, antikathode one side at dividing plate 300), because it is not used in collimation, and anticathode zone is only being arranged, can get involved probe gap area probe one side of dividing plate 300 (that is).Therefore, referring now to the Fig. 5 that shows new collimator apparatus cross section,, the optimum position that dividing plate is connected on the scanning device shell is, near the probe side (splicing sleeve 504 of the dividing plate 300 antikathode, shown in Fig. 5 b), near and the antikathode side of the dividing plate linear transducer array (splicing sleeve 502 is shown in Fig. 5 c).Shown in Fig. 5 a and 5c, the public bolt device 506 that splicing sleeve 502 and 504 is installed on the scanning device shell is fixed together, and is contained on the scanning device shell thereby the two is hung.Aforesaid controllably will collimate the relative dividing plate of ring 308 300 with probe protective shield 314 in addition localized motor-driven screw mandrel respectively conduct be arranged on device 508 and 510 between splicing sleeve 502 and 504 partly shown in Fig. 5 a.Each ring comprises three such lead screw device, each 120 ° at interval.
The example of a physical dimension (all units be except other adds the expositor millimeter) as follows: probe radius 675 efficient are electronic beam radius 882.4 900 collimater gap widths 1.725 3.500Z on 100% specified amplitude limit width 36 targets of radius of a circle 250 collimater radiuses, 375 radiation shield radiuses, 375 dividing plates wide (t) 1.50X-beam bright spot length 2.50 target angles, 78 degree; Electron beam bright spot center+6.24+9.98Z, amplitude limit center-3.11-4.13 on the Z-axle
So, shown here and a kind of novel alignment device that is used for the electron beam ct scanning device be described that it has satisfied all targets and the advantage of attempting to seek.Yet, be familiar with the people of this technology for those, after these explanations of having studied open preferred embodiment and accompanying drawing thereof, many changes, modification, variation and other purposes and the application of theme invention will become clearly.For example, many details mechanically particularly relate to the support problem of dividing plate 300, be easy to change according to its concrete purposes, said these purposes are not limited to the scanning device in the medical treatment, and it also comprises, for example, industry with nondestructive assay device.Have again, employed here ring 302,308 and 314, said circle or " cyclic " be can extend to comprise that part circular or part are cyclic obviously, even those are different from the part curve shape of the curve with radii fixus, and it is useful that these other shape may be improved in the scanner design of type at other.Further again, obviously, it is a bit big or a little bit smaller and all still be available that ring 308 and 314 diameter can make diameter than hole 304 into.Can also be clear that the aperture in the dividing plate 300 itself can provide the X-ray required collimation, in preferred medical scanning device embodiment, ring 308 is used as the preposition protective shield of patient, to alleviate patient x ray irradiation x that is subjected to and the radiation that alleviates scattering.All that does not break away from change, modification, variation and other the purposes of the spirit and scope of the present invention and uses thinks all and is covered by this patent that this patent is only limited by claim, and it follows the explanation of doing according to above stated specification.
Claims (19)
1, a kind of electron beam computerized tomography becomes the scanning phase device, and it comprises:
One in order to generate the source of electron beam;
One is placed on apart from the ring-type antikathode of described source one given distance;
Offset assembly with so that described electron beam scans along described antikathode with the form of bright spot, therefore, generates a mobile X-ray source thereupon, and it moves along a plane;
Setting ring-type X-ray linear transducer array in one plane, this plane substantially with the plane parallel of described mobile X-ray source, and with overlapping and relative mode is spaced away; With
Collimator apparatus between described antikathode and described linear transducer array, in order to the X-ray source that moves that collimation receives for described linear transducer array, described collimator apparatus is characterised in that:
The dividing plate (300) that the material with shielding X-ray of a fixed-site is made, one aperture (304) is arranged on it, the orientation of described dividing plate substantially with the plane of described mobile X-ray source and the plane parallel of linear transducer array (8), thereby for described dividing plate defines an antikathode side and a probe side, except that those X-rays that pass described aperture, baffle shield the passage of X-ray from described antikathode (302) to described linear transducer array; With
The collimation ring (308) that place value is adjustable, its longitudinal axis be configured to dividing plate on aperture coaxial, and can tuning/thereby the angle of leaving the X-ray source that the cathode side is moved from described antikathode of described dividing plate under order observes controllably and determined a gap (306) for described X-ray, and described gap is determined by the interval between the aperture (304) of the end (310) of described dividing plate (300) and described dividing plate of the adjustable collimation ring (308) in described position.
2, as the scanning device that claim 1 limited, its feature also is:
The vacuum bubbles of a part cone-shaped (6), it has a long axis, and in order to seal described source, antikathode and offset assembly, described source is set at a narrow end of described bubble, and described antikathode is set at a relative wide end;
The contiguous described wide end setting of described dividing plate (300), thus the dividing plate plane is substantially perpendicular to the long axis of described bubble.
3, as the scanning device that claim 2 limited, its feature also is:
The splicing sleeve that the wide end of a described vacuum bubbles of vicinity is provided with, described splicing sleeve comprises first (502) and second (504) the annular support frame, they are provided with and form betwixt an interval in close opposed mode, an aperture is arranged on each bearing support, its diameter is greater than the diameter of the aperture (304) on the described dividing plate (300), and its central point overlaps with the central point of aperture on the described dividing plate substantially.
4,, it is characterized in that as the scanning device that claim 3 limited:
Near the part of described linear transducer array (8) that is positioned at of dividing plate (300) antikathode side is connected on described first bearing support (502), and near the part of described antikathode that is positioned at of dividing plate probe side is connected on described second bearing support (504).
5,, it is characterized in that as the scanning device that claim 4 limited:
The longitudinal axis of the collimation ring (308) that described position is adjustable utilizes described collimation ring and described first bearing support (502), and adjustable to be connected the long axis that is oriented to described bubble coaxial.
6, as the scanning device that claim 4 limited, its feature also is:
The radiation shield of a collimator back (314), it comprises a ring (314) that the position is adjustable, the longitudinal axis of this ring be configured to dividing plate (300) on aperture (304) coaxial, and can tuning/leave the probe side of described dividing plate under order.
7, as the scanning device that claim 1 limited, its feature also is:
Be connected in the control device (10) on the described offset assembly (27), thereby change the radiation position of going up the described bright spot of scanning at described antikathode (26,302) in order to control described offset assembly, and change the width of the fladellum that is mapped to described probe (8) therefrom.
8, scanning device as claimed in claim 1, its feature also is:
Be connected in the control device (10) on described offset assembly (27) and the described collimation ring (308), in order to control described offset assembly (27) thus change radiation position at the bright spot of the enterprising line scanning of described antikathode (26,302), this change is coordinated to carry out with the position change of described collimation ring (308), changes the width of described fladellum thus.
9, as the scanning device that claim 1 limited, its feature also is:
The ring-type radiation shield (314) that the position is adjustable, its longitudinal axis and the coaxial setting of the aperture on the dividing plate and can tuning/leave under order the probe side of described dividing plate.
10,, it is characterized in that as the scanning device that claim 1 limited:
Described aperture (304) and collimation ring (308) are all done circular, and the external diameter of described collimation ring (308) diameter with aperture (304) substantially is identical.
11, as the scanning device that claim 3 limited, its feature also is:
The ring-type radiation shield (314) that the position is adjustable, its longitudinal axis and the coaxial setting of the aperture on the dividing plate and can tuning/leave under order the probe side of described dividing plate.
12, as the scanning device that claim 11 limited, the longitudinal axis of the radiation shield that wherein said position is adjustable (314) utilizes described radiation shield and described second bearing support, and adjustable to be connected the long axis that is oriented to described bubble coaxial.
13, be used to collimate the device of mobile X-ray fladellum, it is characterized in that:
The X-alpha ray shield dividing plate of a fixed-site, it is arranged in described mobile X-ray electron gun and is used to survey interval between the X-ray linear transducer array (8) of described X-ray, described dividing plate is provided with parallelly substantially with the plane of moving source formation, thereby described interval is divided into antikathode part and probe segment respectively, described antikathode partly comprises described mobile X-ray electron gun and described probe segment comprises described X-ray linear transducer array, one aperture (304) is arranged on the described dividing plate, be mapped to described linear transducer array by aperture part X-ray from described source, thereby the X-ray is collimated;
The ring (308) that the position is adjustable, it is positioned at described antikathode part and its end plane is positioned on parallel substantially with described dividing plate but the spatially isolated again plane, and simultaneously, its central point overlaps substantially with the central point of described aperture; And
Device (10) in order to controlling the interval between described ring (308) and the described dividing plate (300), thereby is adjusted the collimation width of described X-beam.
14, as the device that claim 13 limited, its feature also is:
The adjustable ring-type radiation shield (314) in position that is positioned at described probe segment, its end plane is positioned on parallel substantially with described dividing plate but the spatially isolated again plane, aperture (304) is coaxial on its longitudinal axis and the dividing plate, and can tuning/leave the probe side of described dividing plate under order.
15, as the device that claim 13 limited, its feature also is:
Offset assembly (27) in order to controlling described mobile X-ray electron gun and the distance between described dividing plate, thereby is controlled the width of described fladellum.
16, a kind of electron beam computerized tomography becomes the scanning phase device, comprising:
One in order to generate the source of electron beam;
One is placed on apart from the ring-type antikathode of described source one given distance;
Offset assembly with so that described electron beam scans along described antikathode with the form of bright spot, therefore, generates a mobile X-ray source thereupon, and it moves along a plane;
Setting ring-type X-ray linear transducer array in one plane, this plane substantially with the plane parallel of described mobile X-ray source, and with overlapping and relative mode is spaced away; With
Collimator apparatus between described antikathode and described linear transducer array, in order to the X-ray source that moves that collimation receives for described linear transducer array, described collimator apparatus is characterised in that:
The dividing plate (300) that the material with shielding X-ray of a fixed-site is made, one aperture (304) is arranged on it, the orientation of described dividing plate substantially with the plane of described mobile X-ray source and the plane parallel of linear transducer array (8), thereby for described dividing plate defines an antikathode side and a probe side, except that those X-rays that pass described aperture, baffle shield the passage of X-ray from described antikathode (302) to described linear transducer array; With
Be connected in the control device (10) on the described offset assembly (27), thereby change radiation position in order to control described offset assembly, and change the width of the fladellum that is mapped to described probe (8) therefrom at the described bright spot of the enterprising line scanning of described antikathode (26).
17, a kind of method that is used to collimate the X-ray fladellum of rotation is characterized in that following steps:
At the X-ray source that moves be used to detect between the linear transducer array (8) of fixed-site of described X-ray, the plane clapboard (300) of a fixed-site is set, described dividing plate is parallel to a plane that is formed by described mobile X-ray source substantially, thereby for described dividing plate defines a mobile source and a probe side, one aperture (304) is arranged on described dividing plate, and the part of described X-ray is passed this aperture at it from the road of described X-ray source directive linear transducer array; And
Adjust between the antikathode side of the plane of described mobile X-ray source and described dividing plate the interval, to control the width of described fladellum.
18, a kind of method that is used to collimate the X-ray fladellum of rotation is characterized in that following steps:
At the X-ray source that moves be used to detect between the linear transducer array (8) of fixed-site of described X-ray, the plane clapboard (300) of a fixed-site is set, described dividing plate is parallel to a plane that is formed by described mobile X-ray source substantially, thereby for described dividing plate defines a mobile source and a probe side, one aperture (304) is arranged on the described dividing plate, and the part of described X-ray is passed this aperture at it from the road of described X-ray source directive linear transducer array;
A ring (308) that the position is adjustable is set, and its end plane is positioned on the plane parallel substantially with the mobile source of described dividing plate but that spatially open (306) at interval again, and its longitudinal axis is coaxial with an axis of symmetry of described aperture substantially; And
Adjust the gap (306) between described ring (308) and described dividing plate (300), to adjust the collimation width of described X-ray.
19, method as claimed in claim 18 is characterized in that:
Adjusting play (306) in the interval between the antikathode side of adjusting described mobile X-ray source plane and described dividing plate, thus make the efficient of collimator reach maximum and make the cone angle between X-ray fladellum and described dividing plate become minimum.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 95103852 CN1146890A (en) | 1995-03-30 | 1995-03-30 | Fixed septum collimator for electron beam tomography |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 95103852 CN1146890A (en) | 1995-03-30 | 1995-03-30 | Fixed septum collimator for electron beam tomography |
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| CN1146890A true CN1146890A (en) | 1997-04-09 |
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| CN 95103852 Pending CN1146890A (en) | 1995-03-30 | 1995-03-30 | Fixed septum collimator for electron beam tomography |
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Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN100339051C (en) * | 2000-12-29 | 2007-09-26 | Ge医疗系统环球技术有限公司 | Detector collimator capable of directional beam-welding for computer x-ray tomography |
| CN101297323B (en) * | 2005-10-25 | 2011-05-18 | 健康与环境慕尼黑德国研究中心赫姆霍茨中心(有限公司) | Imaging method and device with dual reading scanner |
| WO2015131802A1 (en) * | 2014-03-04 | 2015-09-11 | 清华大学 | Inspection device, method and system |
| CN109659061A (en) * | 2018-12-27 | 2019-04-19 | 中国原子能科学研究院 | The continuously adjustable neutron howitzer structure of the angle of divergence and its scaling method |
-
1995
- 1995-03-30 CN CN 95103852 patent/CN1146890A/en active Pending
Cited By (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN100339051C (en) * | 2000-12-29 | 2007-09-26 | Ge医疗系统环球技术有限公司 | Detector collimator capable of directional beam-welding for computer x-ray tomography |
| CN101297323B (en) * | 2005-10-25 | 2011-05-18 | 健康与环境慕尼黑德国研究中心赫姆霍茨中心(有限公司) | Imaging method and device with dual reading scanner |
| WO2015131802A1 (en) * | 2014-03-04 | 2015-09-11 | 清华大学 | Inspection device, method and system |
| US10408966B2 (en) | 2014-03-04 | 2019-09-10 | Tsinghua University | Inspection devices, inspection methods and inspection systems |
| CN109659061A (en) * | 2018-12-27 | 2019-04-19 | 中国原子能科学研究院 | The continuously adjustable neutron howitzer structure of the angle of divergence and its scaling method |
| CN109659061B (en) * | 2018-12-27 | 2020-06-23 | 中国原子能科学研究院 | Neutron collimator structure with continuously adjustable divergence angle and calibration method thereof |
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