COLLIMATING APPARATUS FOR EMISSION TOMOGRAPHY

• US 20140339443A1
• Filed: 05/22/2014
• Published: 11/20/2014
• Est. Priority Date: 11/25/2011
• Status: Abandoned Application

• Current Assignee: Mu, Zhiping
• Original Assignee: Mu, Zhiping
• Inventors: MU, Zhiping
• Application Number:
  US14/285,398
• Publication Number:
  US 20140339443A1
• Time in Patent Office: Days
• US Class Current: 250/505.1
• CPC Class Codes: A61B 6/037 Emission tomography
• CPC Class Codes: A61B 6/06 Diaphragms
• CPC Class Codes: G01T 1/2985 In depth localisation, e.g. using positron emitters; Tomographic imaging (longitudinal and transverse section imaging; apparatus for radiation diagnosis sequentially in different planes, steroscopic radiation diagnosis); using external radiation sources A61B6/02
• CPC Class Codes: G21K 1/02 using diaphragms, collimators

Abstract

Disclosed is a collimating apparatus for emission tomography. The collimating apparatus comprises a perforated plate (1) that is disposed between a detector (2) and a to-be-detected object and provided with a plurality of through holes (5); wherein a minimum distance between central points of each two adjacent through holes (5) is t, and a distance from the central point of the through hole (5) to the wall of the through hole (5) is half of Φ, where t>Φ>t/2. The perforated plate (1) comprised in the collimating apparatus addresses problems of both the stability of portions surrounding the through holes (5) and the aperture ratio of the perforated plate (1), and ensures sensitivity of the detector (2).

Claims

1. A collimating apparatus for emission tomography, comprising:

a perforated plate (1) that is disposed between a detector (2) and a to-be-detected object and provided with a plurality of through holes (5);

wherein a minimum distance between central points of each two adjacent through holes (5) is t, and a distance from the central point of the through hole (5) to the wall of the through hole (5) is half of Φ

, where t>

Φ

>

t/2.

2. The collimating apparatus according to claim 1, wherein the through holes (5) are circular holes, the central point is the center of the circle, Φ

is a diameter, and t>

Φ

>

t/1.95.

3. The collimating apparatus according to claim 1, wherein the through holes (5) are arranged according to a matrix on the perforated plate (1);

in the same row or in the same column, the minimum distance between the central points of the each two adjacent through holes (5) is t;

Φ

is twice a maximum distance or a minimum distance from the central point of the through hole (5) to the wall of the through hole (5).

4. The collimating apparatus according to claim 2, wherein the through holes (5) are diameter-variable holes, Φ

is an average diameter, and t>

Φ

>

t/1.95.

5. The collimating apparatus according to claim 1, wherein a shielding apparatus I (4) is disposed between the perforated plate (1) and the detector (2);

and a shielding apparatus II (3) that is position-adjustable is disposed between the perforated plate (1) and the to-be-detected object.

6. The collimating apparatus according to claim 2, wherein a shielding apparatus I (4) is disposed between the perforated plate (1) and the detector (2);

and a shielding apparatus II (3) that is position-adjustable is disposed between the perforated plate (1) and the to-be-detected object.

7. The collimating apparatus according to claim 3, wherein a shielding apparatus I (4) is disposed between the perforated plate (1) and the detector (2);

and a shielding apparatus II (3) that is position-adjustable is disposed between the perforated plate (1) and the to-be-detected object.

8. The collimating apparatus according to claim 4, wherein a shielding apparatus I (4) is disposed between the perforated plate (1) and the detector (2);

and a shielding apparatus II (3) that is position-adjustable is disposed between the perforated plate (1) and the to-be-detected object.

9. The collimating apparatus according to claim 1, wherein the perforated plate (1) is a planar coded aperture plate provided with holes that are evenly spaced according to a matrix function h(x, y), where (x, y) denotes coordinates of the planar coded aperture plate.

10. The collimating apparatus according to claim 2, wherein the perforated plate (1) is a planar coded aperture plate provided with holes that are evenly spaced according to a matrix function h(x, y), where (x, y) denotes coordinates of the planar coded aperture plate.

11. The collimating apparatus according to claim 3, wherein the perforated plate (1) is a planar coded aperture plate provided with holes that are evenly spaced according to a matrix function h(x, y), where (x, y) denotes coordinates of the planar coded aperture plate.

12. The collimating apparatus according to claim 4, wherein the perforated plate (1) is a planar coded aperture plate provided with holes that are evenly spaced according to a matrix function h(x, y), where (x, y) denotes coordinates of the planar coded aperture plate.

13. The collimating apparatus according to claim 1, wherein a perpendicular distance and/or a relative horizontal position between the perforated plate (1) and the detector (2) are/is changed by adjusting the perforated plate (1) and/or the detector (2).

14. The collimating apparatus according to claim 2, wherein a perpendicular distance and/or a relative horizontal position between the perforated plate (1) and the detector (2) are/is changed by adjusting the perforated plate (1) and/or the detector (2).

15. The collimating apparatus according to claim 3, wherein a perpendicular distance and/or a relative horizontal position between the perforated plate (1) and the detector (2) are/is changed by adjusting the perforated plate (1) and/or the detector (2).

16. The collimating apparatus according to claim 4, wherein a perpendicular distance and/or a relative horizontal position between the perforated plate (1) and the detector (2) are/is changed by adjusting the perforated plate (1) and/or the detector (2).

17. The collimating apparatus according to claim 5, wherein the opening of the shielding apparatus II (3) is adjusted by stretch and retraction, and a perpendicular distance and/or a relative horizontal position between the shielding apparatus II (3) and the perforated plate (1) are/is adjustable.

18. The collimating apparatus according to claim 9, wherein the matrix function h(x, y) is a modified uniformly redundant array, a uniformly redundant array, a random array, or a pseudo-random array.

19. The collimating apparatus according to claim 9, wherein the through holes are provided where the matrix function h(x, y)=1, and coordinates where the matrix function h(x, y)=1 are coordinates of the central point of the through hole (5).