High resolution, multiple detector tomographic radionuclide imaging based upon separated radiation detection elements

• US 6,838,672 B2
• Filed: 12/17/2001
• Issued: 01/04/2005
• Est. Priority Date: 12/17/2001
• Status: Active Grant

• Current Assignee: Siemens Medical Solutions USA Incorporated (Siemens AG)
• Original Assignee: Siemens Medical Solutions USA Incorporated (Siemens AG)
• Inventors: Pawlak, John T., Wagenaar, Douglas J., Engdahl, John C.
• Primary Examiner(s): Fulton, Christopher W.
• Application Number:
  US10/015,779
• Publication Number:
  US 20030111610A1
• Time in Patent Office: 1,114 Days
• Field of Search: 250/363.04, 250/363.1, 250/366, 250/369
• US Class Current: 250/363.04
• CPC Class Codes: A61B 6/037 Emission tomography
• CPC Class Codes: G01T 1/1644 using an array of optically separate scintillation elements permitting direct location of scintillations G01T1/1645 takes precedence

Abstract

A radionuclide scanner in which multiple detectors are equipped with collimators such that a circular rotation of the detector around a target provides the movement needed for collimator sampling. This collimator sampling is accomplished through strategic placement of the detector heads relative to each other such that for any given projection, a complete imaging of the projection is acquired by summing the complementary contributions of the multiple detector heads at the projection under consideration.

Claims

1. A radionuclide imaging device, comprising:

a plurality of radiation detectors for scanning a target, each radiation detector including a collimator having a pattern of apertures that is offset from collimator aperture patterns of others of said plurality of radiation detectors, such that for a particular target projection sampling to be acquired, each of the radiation detectors provides a complementary image sampling contribution at said particular projection, said complementary image sampling contributions being summed to provide a complete sampling of the target at said particular projection.

2. The radionuclide imaging device of claim 1, wherein each of said radiation detectors is a homogenous area detector, and said plurality of radiation detectors are rotated around said target such that each detector scans the same target projection at different times.

3. The radionuclide imaging device of claim 2, wherein each of said radiation detectors uses sparse hole sampling, and motion required for the sparse hole sampling is provided by said radiation detectors'"'"' rotation around the target.

4. The radionuclide imaging device of claim 1, wherein each of said radiation detectors is a pixellated detector, and said plurality of radiation detectors are rotated around said target such that each detector scans the same target projection at different times.

5. The radionuclide imaging device of claim 4, wherein each of said radiation detectors uses registered collimator sampling, and motion required for registered collimator sampling is provided by said radiation detectors'"'"' rotation around the target.

6. The radionuclide imaging device of claim 1, wherein the collimator aperture pattern of each of said radiation detectors is offset in both an axial and a transaxial direction from the collimator aperture patterns of the other radiation detectors of the plurality of radiation detectors.

7. A radionuclide imaging device comprising an array of radiation detectors arranged on a plane parallel to a target to be imaged, wherein each of said radiation detectors is configured with a slant-hole collimator and is rotated in said plane for performing tomosynthesis tomography of said target, and

wherein each of said slant-hole collimators of said radiation detectors has a slant-hole angle different from slant-hole angles of the others of said plurality of radiation detectors, such that for a particular target projection sampling to be acquired by a rotation of said detectors around said plane, each of the radiation detectors provides a complementary contribution at the projection which are summed to provide a complete sampling of the target projection.

8. The radionuclide imaging device of claim 7, wherein each of said radiation detectors is a homogenous area detector.

9. The radionuclide imaging device of claim 8, wherein each of said radiation detectors uses sparse hole sampling, and motion required for the sparse hole sampling is provided by said radiation detectors'"'"' rotation in said plane.

10. The radionuclide imaging device of claim 7, wherein each of said radiation detectors is a pixellated detector.

11. The radionuclide imaging device of claim 10, wherein each of said radiation detectors uses registered collimator sampling, and motion required for registered collimator sampling is provided by said radiation detectors'"'"' rotation in said plane.

12. A method of acquiring at a particular projection a planar image of an object emitting radionuclide radiation, comprising the steps of:

sequentially imaging said projection with a plurality of radiation detectors each including a collimator having a pattern of apertures that is offset from collimator aperture patterns of others of said plurality of radiation detectors, such that for a particular target projection sampling to be acquired, each of the radiation detectors provides a complementary image sampling contribution at said particular projection; and

summing said complementary image sampling contributions to provide a complete sampling of the target at said particular projection.

13. The method of claim 12, further comprising the steps of imaging said object at multiple projections using said steps of sequential imaging and summing, by rotating said plurality of radiation detectors around said object, and combining image sampling at each of said multiple projections to obtain a tomographic image of said object.

14. A radiation detector for use in a radionuclide imaging device having a plurality n of radiation detectors for obtaining tomographic images of a target, said radiation including a collimator having a number of apertures equal to 1/n of the total number of apertures required to acquire complete image sampling data at a particular target projection.

15. A radiation detector as set forth in claim 14, wherein a pattern of said apertures of said collimator is offset from collimator aperture patterns of others of said plurality n of radiation detectors used in said radionuclide imaging device.