WO2005040635A2 - Vorrichtung und verfahren zur tomographie mit translationsbewegung zwischen objekt und detektor - Google Patents
Vorrichtung und verfahren zur tomographie mit translationsbewegung zwischen objekt und detektor Download PDFInfo
- Publication number
- WO2005040635A2 WO2005040635A2 PCT/DE2004/002310 DE2004002310W WO2005040635A2 WO 2005040635 A2 WO2005040635 A2 WO 2005040635A2 DE 2004002310 W DE2004002310 W DE 2004002310W WO 2005040635 A2 WO2005040635 A2 WO 2005040635A2
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- WO
- WIPO (PCT)
- Prior art keywords
- detector
- detectors
- collimator
- hole
- holes
- Prior art date
Links
- 238000000034 method Methods 0.000 title claims abstract description 43
- 238000013461 design Methods 0.000 claims description 5
- 238000012545 processing Methods 0.000 claims description 4
- 238000004590 computer program Methods 0.000 claims description 2
- 238000003325 tomography Methods 0.000 abstract description 5
- 238000011835 investigation Methods 0.000 abstract 1
- 230000035945 sensitivity Effects 0.000 description 16
- 238000002603 single-photon emission computed tomography Methods 0.000 description 16
- 238000005259 measurement Methods 0.000 description 11
- 238000009826 distribution Methods 0.000 description 9
- 239000012217 radiopharmaceutical Substances 0.000 description 9
- 229940121896 radiopharmaceutical Drugs 0.000 description 9
- 230000002799 radiopharmaceutical effect Effects 0.000 description 9
- 230000000694 effects Effects 0.000 description 8
- 238000013519 translation Methods 0.000 description 8
- 241001465754 Metazoa Species 0.000 description 5
- 238000004422 calculation algorithm Methods 0.000 description 5
- 238000004364 calculation method Methods 0.000 description 5
- 238000012937 correction Methods 0.000 description 5
- 238000003384 imaging method Methods 0.000 description 5
- 210000000746 body region Anatomy 0.000 description 3
- 238000010276 construction Methods 0.000 description 3
- 238000002600 positron emission tomography Methods 0.000 description 3
- 210000001685 thyroid gland Anatomy 0.000 description 3
- 238000010521 absorption reaction Methods 0.000 description 2
- 230000001133 acceleration Effects 0.000 description 2
- 239000003814 drug Substances 0.000 description 2
- 238000005516 engineering process Methods 0.000 description 2
- 239000000463 material Substances 0.000 description 2
- 239000000700 radioactive tracer Substances 0.000 description 2
- 210000001519 tissue Anatomy 0.000 description 2
- 241000237942 Conidae Species 0.000 description 1
- 241000196324 Embryophyta Species 0.000 description 1
- 241000282412 Homo Species 0.000 description 1
- 238000007476 Maximum Likelihood Methods 0.000 description 1
- 241000699670 Mus sp. Species 0.000 description 1
- 238000010171 animal model Methods 0.000 description 1
- 238000013459 approach Methods 0.000 description 1
- 230000017531 blood circulation Effects 0.000 description 1
- 210000004556 brain Anatomy 0.000 description 1
- 150000001875 compounds Chemical class 0.000 description 1
- 239000013078 crystal Substances 0.000 description 1
- 230000007423 decrease Effects 0.000 description 1
- 230000006866 deterioration Effects 0.000 description 1
- 238000011161 development Methods 0.000 description 1
- 230000018109 developmental process Effects 0.000 description 1
- 238000006073 displacement reaction Methods 0.000 description 1
- 238000011156 evaluation Methods 0.000 description 1
- 238000001727 in vivo Methods 0.000 description 1
- 238000013507 mapping Methods 0.000 description 1
- 239000011159 matrix material Substances 0.000 description 1
- 210000004165 myocardium Anatomy 0.000 description 1
- 238000009206 nuclear medicine Methods 0.000 description 1
- 210000000056 organ Anatomy 0.000 description 1
- 230000000144 pharmacologic effect Effects 0.000 description 1
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- 238000011144 upstream manufacturing Methods 0.000 description 1
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Classifications
-
- G—PHYSICS
- G01—MEASURING; TESTING
- G01T—MEASUREMENT OF NUCLEAR OR X-RADIATION
- G01T1/00—Measuring X-radiation, gamma radiation, corpuscular radiation, or cosmic radiation
- G01T1/16—Measuring radiation intensity
- G01T1/161—Applications in the field of nuclear medicine, e.g. in vivo counting
- G01T1/164—Scintigraphy
- G01T1/166—Scintigraphy involving relative movement between detector and subject
-
- A—HUMAN NECESSITIES
- A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
- A61B—DIAGNOSIS; SURGERY; IDENTIFICATION
- A61B6/00—Apparatus for radiation diagnosis, e.g. combined with radiation therapy equipment
- A61B6/02—Devices for diagnosis sequentially in different planes; Stereoscopic radiation diagnosis
- A61B6/03—Computerised tomographs
- A61B6/037—Emission tomography
-
- G—PHYSICS
- G01—MEASURING; TESTING
- G01T—MEASUREMENT OF NUCLEAR OR X-RADIATION
- G01T1/00—Measuring X-radiation, gamma radiation, corpuscular radiation, or cosmic radiation
- G01T1/16—Measuring radiation intensity
- G01T1/161—Applications in the field of nuclear medicine, e.g. in vivo counting
- G01T1/164—Scintigraphy
- G01T1/1641—Static instruments for imaging the distribution of radioactivity in one or two dimensions using one or several scintillating elements; Radio-isotope cameras
- G01T1/1642—Static instruments for imaging the distribution of radioactivity in one or two dimensions using one or several scintillating elements; Radio-isotope cameras using a scintillation crystal and position sensing photodetector arrays, e.g. ANGER cameras
Definitions
- the invention relates to a device and a method for tomography, in particular for single photon (emission) tomography (SPECT).
- SPECT single photon (emission) tomography
- single-photon tomography relates to a method for the three-dimensional representation of radiopharmaceuticals which have been brought into an object.
- objects In particular, humans, animals, plants or parts thereof as well as inanimate objects can be provided as objects.
- the radiopharmaceuticals placed in the object emit photons.
- the device detects and evaluates the photons.
- the position ie the spatial distribution of the radiopharmaceutical in the object, is obtained as a result of the evaluation.
- the location of the radiopharmaceuticals in turn allows conclusions to be drawn about the object, for example about a distribution of tissue in the object.
- a known device for performing a SPECT comprises a gamma camera as a detector and an upstream collimator.
- the collimator is generally a plate made of a material with a high absorption coefficient and a plurality of channels running perpendicularly through the plate. The provision of the channels ensures that only vertically incident photons are detected and that a spatially resolving measurement is possible.
- SPECT and positron emission tomography (PET) are instruments for the quantitative display and reconstruction of spatial radiotracer distributions in vivo. In addition to human medicine, these methods can be used in pharmacological and preclinical research to develop and evaluate novel tracer compounds.
- a hole collimator is used to improve the spatial resolution and sensitivity of SPECT.
- Hole collimator is characterized by a single hole in the collimator plate through which the photons pass. If the object is closer to the hole collimator than the surface of a gamma camera or a detector, this improves the situation
- the photons do not only pass perpendicularly through the hole collimator. Instead, they are mapped using a central geometry that advantageously has a magnifying effect. This enables a reconstructed resolution to be achieved which is advantageously significantly smaller than the intrinsic resolution of the detector.
- a small passage opening or a small hole is provided in a hole collimator, through which the photons pass in order to achieve a good spatial resolution receive.
- the smaller the hole the fewer photons pass through this hole.
- Sensitivity is defined as the ratio of the measured count rate to the activity in the object. If the sensitivity becomes too low, SPECT can no longer be carried out.
- the spatial resolution is also advantageously smaller, so that a compromise between sensitivity and spatial resolution must be found with regard to the hole size.
- a device with a multi-hole collimator and a detector for detecting photons that pass through the multi-hole collimator are known from the document DE 101 42 421 A1.
- the collimator therefore has a plurality of through openings.
- the distribution of the radiopharmaceuticals can be measured with high resolution and with high sensitivity.
- different distributions of the radiopharmaceuticals in the object are assumed, measurement results are calculated from them, which the assumed distributions would achieve, and the assumed distribution, whose calculated measurement result best matches the measurement result obtained, is selected as the reconstruction result.
- the camera and collimator rotate around the object for SPECT examinations (R-SPECT).
- R-SPECT SPECT examinations
- the detectors are moved around the object at 6 degree intervals on a given radius, so that 60 projections for all detectors for a sequence can be obtained.
- the rotation radius on which the detectors rotate around the object is relevant as a further parameter for the reconstruction. The latter is constant throughout the measurement.
- mice In the event that small objects, such as. For example, if mice are examined, it is also possible to rotate them about their axis and to hold the detector (s) and their col- limators stationary.
- the reading accuracy of such methods is approximately 1 millimeter or 1/10 degree.
- a large number of projection data is thus obtained through the SPECT examinations.
- the position of the radiopharmaceuticals in the object can then be determined from the information obtained around the object.
- Functional statements can then be made from the reconstructed, three-dimensional activity patterns, for example about the blood flow to the heart muscle or the receptor density in the brain.
- the mechanical system for positioning the detectors is disadvantageous, since the mass of the detectors can be 100 kg and more.
- the data required from certain organs that are difficult to access can only be obtained under difficult conditions and with poor results.
- the disadvantageous effect is that the animal is subjected to physiological stress. Furthermore, shifts in soft tissues within the animal have to be compensated for.
- the object of the invention is therefore to provide a device for carrying out a tomographic method which is high-resolution and sensitive and with which body regions which are difficult to access can be easily examined.
- the device has means for forming a translational movement during the method relative between an object to be examined and the detector or detectors (T-SPECT).
- a translational movement is carried out, in which either the light object through the field of view of the detector or detectors or a translational movement relative to the object carry out.
- Projection images are recorded at a number of points and combined into a sequence.
- sequence data on the relative position between the object and the detector, and optionally a rotation radius are recorded at a number of points and combined into a sequence.
- the object to be examined must also be freely accessible from one side only.
- the device comprises two detectors, which are aligned, in particular, orthogonally to one another, the object must accordingly be freely accessible from two sides.
- the detector or detectors can also perform translational movements relative to the object, which is advantageous for applications, in particular for applications in human medicine.
- a sequence contains the T-SPECT two more parameters per element.
- tilted holes is particularly advantageous since the object can already be seen by the detector from different directions without complete rotation being carried out. As a result, different viewing angles are obtained, even when using a single detector, and therefore more accurate depth information.
- all parts of a tomograph that enable a translational movement of the object and or the detector or detectors.
- the device enables a translational movement between the object to be examined and the detector or detectors with a positioning accuracy of less than 1 millimeter, in particular with an accuracy of less than 0.1 millimeter.
- this enables high-resolution and highly sensitive tomography with a simplified structure even of body regions that are otherwise very difficult to access.
- the means further advantageously form translational movements in more than one spatial direction, possibly in all three spatial directions, that is to say in the X, Y and Z directions.
- the means can be designed in such a way that they carry out a translational movement in all spatial directions simultaneously. This advantageously saves time when positioning the object relative to the detector or detectors.
- the means are particularly advantageously automatically positionable.
- a PC can control the translation movement of the means or means, coordinate with the measurement process and, if necessary, also evaluate the information obtained for reconstruction calculations.
- detectors it is possible to design one or possibly several detectors by suitable means so that the detectors themselves carry out the translation movement. Means are then, for example, detector hardenings which enable the detectors to move in translation. In one embodiment of the invention, the detector or detectors can also carry out rotational movements.
- a holder for an object to be examined as a means such that it carries out the translation movement.
- the bracket may include a table that can be moved on rails.
- the object is moved on the table by three linear axes through the field of view of the detector or detectors.
- the acceleration of the movement can be implemented so smoothly that tissue displacements in the object play no role.
- the holder for the object performs a translational movement and the detector or detectors perform a coupled translational and / or even rotational movement.
- the means that is to say without manually repositioning the detectors or the table.
- Each projection is saved with the relative position of the object to the detectors and a possible rotation angle and assigned to the projection image.
- the number of required projection data and the measurement time of a T-SPECT system is nevertheless comparable to that of an R-SPECT system according to the prior art.
- the time period in which the translation movement is carried out is small compared to the measurement period.
- the holder for the object to be examined advantageously comprises a 3-axis table or a couch, which can carry out translational movements during the examination method.
- the table is e.g. B. movably arranged on rails.
- the object to be examined is on the table.
- the rails are arranged so that the movement of the object on the table on linear axes is made possible by the field of view of the camera, possibly in all three spatial directions.
- the holder is particularly advantageously designed to be tiltable.
- the holder is tilted parallel to the surface of one or more detectors.
- the orientation of the object to the collimator and the camera can be changed slightly. This gives additional information from a different direction in the projections, which leads to improved depth information.
- a rotational movement of the holder or of the detector or detectors can thus also consist of a tilting process.
- the distance between the object and the multi-hole collimator can advantageously be smaller than the distance between the multi-hole collimator and the surface of the detector in order to achieve an enlargement on the detector surface.
- the device advantageously comprises two detectors which are arranged orthogonally to one another. As a result, both detectors deliver a maximum of different information. A very well reconstructed resolution and a high sensitivity with extremely simple achieved device construction. This reduces costs.
- the multi-hole collimators have double-conical inward holes.
- the holes particularly advantageously have a so-called keel-edge design, with an opening angle that is taken into account in the subsequent reconstruction algorithm.
- Keel-edge holes have a short cylindrical channel between the cones parallel to each other.
- each hole sees a part or the entire object. All holes together cover the entire volume to be examined in the object.
- the axes of the holes are particularly advantageous in the axial and / or in the transaxial
- the algorithm for the reconstruction method works with any multi-pinhole projections and can reconstruct the desired activity distribution from them.
- the relative position and the relative angle between the object and the detectors are always taken into account, while known reconstruction methods always work with fixed rotation radii.
- the method according to the invention also takes into account possible changes in position between the object and the detectors.
- the T-SPECT system according to the invention can also be used in situations in which the object is not accessible from all sides.
- a detector system which, for. B. comprises two detectors arranged orthogonally to one another, the object must only be able to see from two sides.
- the patient's upper body can also be circumvented in an ellipse in order to always be as close as possible to the thyroid gland, or only pick up the patient from two sides.
- T-SPECT examinations with only one detector already provide images whose result in terms of depth information is significantly better than comparable planar images without this information. With two detectors aligned orthogonally to one another, shapes are further equalized and the resolution is increased and further improved depth information is obtained.
- three detectors in a 120 degree geometry or other configurations can be used. It should be noted that the resolution and sensitivity on the sides facing the detectors is significantly higher than on the sides facing away. Reconstructed resolutions of less than 2 millimeters with average sensitivities of 800 cps / MBq can be achieved.
- the position between object and detector (s) is changed with an accuracy of less than 1 millimeter, in particular with an accuracy of less than 0.1 millimeter.
- the measured projections are carried out using an iterative reconstruction algorithm, e.g. B. based on the maximum likelihood expectation maximization (MLEM) processed.
- MLEM maximum likelihood expectation maximization
- To determine the system matrix of the imaging system a model based on ray tracing technology is used to determine the imaging function for each voxel of the object volume and each hole. A small area of each hole is scanned from each voxel and, taking into account the absorption in the diaphragm and in the crystal, as well as the imaging geometry, the sensitivity with which each pixel on the detector corresponds is calculated. looking voxel. The half-width of the spot on the detector is determined analogously. These values are pre-calculated in tables and used in the reconstruction program.
- the translational movement increases the effective volume for which the mapping function is to be calculated, so that the tables are optionally only calculated for a coarser grid and are then determined in the reconstruction by trilinear interpolation for all voxels.
- Typical values here are voxel edge lengths of 0.3 mm in the object volume and 0.6 mm in the tables.
- a device for this purpose, comprises a data processing unit, e.g. B. a PC.
- the PC processes the data and is programmable.
- a computer program product then enables the method to be carried out in the device.
- the calculation can be done in the following way:
- control of the translation movement and / or the reconstruction method can be carried out particularly advantageously on a PC.
- a weakening correction and an acceleration of the iteration can be carried out by restricting to subsets of projections (ordered subsets).
- each hole is scanned with rays (preferably 100) from each voxel and the cutting length, ie the length of the material passage in the aperture, is calculated for the photons on their way to the detector.
- the holes are modeled as a keel-edge shape, i.e. with two double cones and a channel in between. All cuts with the two detector surfaces, the two cone shells and the channel are therefore taken into account.
- the axis of the hole can be tilted axially and transaxially as desired.
- the full width at half maximum is estimated via the imaging geometry, it being assumed that map the voxels in a Gaussian shape. This assumption applies to voxels near the center perpendicular to the detector. This is also sufficiently accurate for voxels that are shown at larger angles.
- the intrinsic resolution of the detector i.e. the resolution without a collimator, is taken into account.
- look-up tables are created for each.
- the possible values are indexed there and encoded in one byte (8 bits).
- the data is then trilinearly interpolated for the object volume from the tables. This can either happen each time the table is accessed or alternatively once for the entire target volume.
- the tables for the sensitivity and half-width values for all diaphragms and holes as well as the projection and measurement data containing the position and the angle of the object or detector are loaded.
- a starting object e.g. cylinder homogeneously filled with radiopharmaceuticals
- a starting object is determined and selected as the first object volume and an iteration is carried out.
- the iterations are stopped when the desired result is achieved.
- the algorithm guarantees that the likelihood function is increased with every step, i.e. the The probability that the calculated object volume has generated the measured projections always increases.
- the iterations can only be applied to a subset. For example, 60 projections are divided into 12 groups of 5 projections each and sub-iterations with only 5 projections each. As a result, corrections are carried out more frequently and the object volume therefore approaches the end result more quickly.
- the number and size of the groups can be varied, in particular it is advantageous to make the number of groups smaller in later iterations, so that towards the end of the reconstruction, more and more projections simultaneously contribute to the correction values.
- the result can be improved even further by orthogonal permutation of the groups.
- FIG. 1 The basic structure of a device with two orthogonally aligned detectors, each consisting of a multi-hole collimator 2, 5 and the detector surface of the gamma camera 3, 6 is illustrated in FIG. 1.
- the object 1 is closer to the multi-hole collimators 2, 5 than the detector surfaces 3, 6.
- the multi-hole collimators 2, 5 have holes which open into the collimator 2, 5 in a funnel shape from both sides (not shown), so as to allow diagonally incident photons to pass through the holes. Two holes (without reference numerals) are shown for each collimator, through which the photons 8 pass.
- the holes are designed in a keel-edge shape. Photons 8 emerging from the object pass through the holes of the collimators 2, 5 in the direction of the detector surfaces 3, 6. The object 1 is thus reproduced enlarged on the detector surface 3, 6.
- FIG. 2 shows coronal (upper row) and sagittal sections (lower row) of a phantom (a), a reconstruction with only one detector and one hole in the aperture (b) and with one detector and seven holes (c ).
- the numbers in the phantom are a measure of the activity in the hot spots.
- the Phantom is a homogeneously filled cylinder with rounded caps that contains 12 hot springs with increased activity.
- the coronal sections give better results because the detector is directed perpendicularly to this plane and thus contains maximum information.
- depth information is missing, since the one hole only sees the phantom from exactly one side.
- the sagittal section is therefore distorted and individual points are difficult to resolve in the sagittal direction.
- sources from other planes shine through through the sagittal direction.
- FIG. 3 shows reconstructions of the same phantom as that in FIG. 2. All images of FIG. 3 were taken with the same 7-hole aperture, but with a different number of detectors. For comparison, FIG. 3 (a) shows the result with conventional R-SPECT, represented by the rotation symbol.
- FIG. 3 (a) shows the coronal and sagittal sections known from FIG. 2 (c) with only one detector.
- Figures 3 (c) to 3 (e) show corresponding coronal and sagittal sections with two orthogonally aligned (Fig. 3 (c)), with three at 120 ° to each other (Fig. 3 (d)) and with four detectors aligned at 90 ° to each other.
- the devices according to the invention can thus be adapted.
- the same number of projections was used for the T-SPECT recordings, ie 60 projections were recorded with one detector, 30 projections with two detectors, 20 with three and 15 with four detectors.
- the position of the object was determined by translational movement at a distance from 50 millimeters in the X / Y direction by up to 10 millimeters and in the Z direction by a maximum of 5 millimeters.
Abstract
Description
Claims
Priority Applications (2)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
US10/576,933 US7498580B2 (en) | 2003-10-21 | 2004-10-18 | Tomographic device and method with translational movement between object and detector |
EP04790005A EP1676152A2 (de) | 2003-10-21 | 2004-10-18 | Vorrichtung und verfahren zur tomographie mit translationsbewegung zwischen objekt und detektor |
Applications Claiming Priority (2)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
DE10348868A DE10348868A1 (de) | 2003-10-21 | 2003-10-21 | T-spect |
DE10348868.5 | 2003-10-21 |
Publications (2)
Publication Number | Publication Date |
---|---|
WO2005040635A2 true WO2005040635A2 (de) | 2005-05-06 |
WO2005040635A3 WO2005040635A3 (de) | 2005-06-30 |
Family
ID=34484861
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
PCT/DE2004/002310 WO2005040635A2 (de) | 2003-10-21 | 2004-10-18 | Vorrichtung und verfahren zur tomographie mit translationsbewegung zwischen objekt und detektor |
Country Status (4)
Country | Link |
---|---|
US (1) | US7498580B2 (de) |
EP (1) | EP1676152A2 (de) |
DE (1) | DE10348868A1 (de) |
WO (1) | WO2005040635A2 (de) |
Cited By (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
KR20180045074A (ko) * | 2016-09-19 | 2018-05-04 | 고려대학교 산학협력단 | 방사선 검출 방법 및 장치 |
Families Citing this family (2)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US7786444B2 (en) * | 2006-11-17 | 2010-08-31 | Gamma Medica-Ideas, Inc. | Multi-aperture single photon emission computed tomography (SPECT) imaging apparatus |
US20120265050A1 (en) * | 2011-04-04 | 2012-10-18 | Ge Wang | Omni-Tomographic Imaging for Interior Reconstruction using Simultaneous Data Acquisition from Multiple Imaging Modalities |
Citations (5)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
GB1184304A (en) * | 1967-06-15 | 1970-03-11 | Hal Oscar Anger | Tomographic Radioactivity Scanner with Simultaneous Readout of Several Planes |
US5107121A (en) * | 1989-10-27 | 1992-04-21 | Trionix Research Laboratory, Inc. | Gantry and pallet assembly used in nuclear imaging |
EP0846961A1 (de) * | 1996-11-27 | 1998-06-10 | Picker International, Inc. | Gammakamera |
US6147352A (en) * | 1998-02-23 | 2000-11-14 | Digirad Corporation | Low profile open ring single photon emission computed tomographic imager |
DE10142421A1 (de) * | 2001-08-31 | 2003-04-03 | Forschungszentrum Juelich Gmbh | Vorrichtung für SPECT-Untersuchungen |
Family Cites Families (3)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US4144457A (en) * | 1976-04-05 | 1979-03-13 | Albert Richard D | Tomographic X-ray scanning system |
US4419585A (en) * | 1981-02-26 | 1983-12-06 | Massachusetts General Hospital | Variable angle slant hole collimator |
US6031892A (en) * | 1989-12-05 | 2000-02-29 | University Of Massachusetts Medical Center | System for quantitative radiographic imaging |
-
2003
- 2003-10-21 DE DE10348868A patent/DE10348868A1/de not_active Withdrawn
-
2004
- 2004-10-18 EP EP04790005A patent/EP1676152A2/de not_active Withdrawn
- 2004-10-18 WO PCT/DE2004/002310 patent/WO2005040635A2/de active Application Filing
- 2004-10-18 US US10/576,933 patent/US7498580B2/en not_active Expired - Fee Related
Patent Citations (5)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
GB1184304A (en) * | 1967-06-15 | 1970-03-11 | Hal Oscar Anger | Tomographic Radioactivity Scanner with Simultaneous Readout of Several Planes |
US5107121A (en) * | 1989-10-27 | 1992-04-21 | Trionix Research Laboratory, Inc. | Gantry and pallet assembly used in nuclear imaging |
EP0846961A1 (de) * | 1996-11-27 | 1998-06-10 | Picker International, Inc. | Gammakamera |
US6147352A (en) * | 1998-02-23 | 2000-11-14 | Digirad Corporation | Low profile open ring single photon emission computed tomographic imager |
DE10142421A1 (de) * | 2001-08-31 | 2003-04-03 | Forschungszentrum Juelich Gmbh | Vorrichtung für SPECT-Untersuchungen |
Cited By (2)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
KR20180045074A (ko) * | 2016-09-19 | 2018-05-04 | 고려대학교 산학협력단 | 방사선 검출 방법 및 장치 |
KR101865245B1 (ko) * | 2016-09-19 | 2018-06-07 | 고려대학교 산학협력단 | 방사선 검출 방법 및 장치 |
Also Published As
Publication number | Publication date |
---|---|
WO2005040635A3 (de) | 2005-06-30 |
US20070215811A1 (en) | 2007-09-20 |
EP1676152A2 (de) | 2006-07-05 |
DE10348868A1 (de) | 2005-06-16 |
US7498580B2 (en) | 2009-03-03 |
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