Detector arrangement for x-ray tomography system

• US 5,757,878 A
• Filed: 08/16/1996
• Issued: 05/26/1998
• Est. Priority Date: 08/16/1996
• Status: Expired due to Fees

• Current Assignee: Analogic Corporation
• Original Assignee: Analogic Corporation
• Inventors: Dobbs, John, Deych, Ruvin
• Primary Examiner(s): Porta, David P.
• Application Number:
  US08/698,717
• Time in Patent Office: 648 Days
• Field of Search: 378/19, 378/4, 378/7
• US Class Current: 378/19
• CPC Class Codes: A61B 6/032 Transmission computed tomography [CT]

Abstract

In an x-ray scanning system having an x-ray source and a plurality of x-ray detectors mounted in substantially linear arrays and positioned along an arc extending about a focal spot defined by the x-ray source, the placement of the arrays along the arc is optimized to substantially avoid interfering contact between adjacent arrays. Each detector array is located at a preselected radial distance from the focal spot and oriented at a preselected angle with respect to radial lines extending from the focal spot so that the radiation-insensitive end portions of adjacent arrays overlap in the tangential direction. The tangential spacing between adjacent detector arrays is thus approximately equal to the tangential spacing between adjacent detectors in a single array.

Claims

1. An x-ray scanning system including (a) a gantry including a disk for supporting at least an x-ray source, and a frame for rotatably supporting the disk for rotation about a rotation axis, (b) an x-ray detector assembly including a plurality of x-ray detectors cooperative with said x-ray source, wherein said x-ray source defines a focal spot from which radiation is emitted, said detectors being grouped in a plurality of substantially linear arrays fixedly positioned substantially along an arc extending about the focal spot, (c) a support structure connected to said disk for supporting said detector assembly, and (d) a data acquisition system for processing signals received from said detectors, said x-ray scanning system further comprising:

means for optimizing the placement of, and securing, said detector arrays along said arc so that interfering contact of adjacent arrays is substantially avoided.

2. The x-ray scanning system of claim 1, wherein said means for optimizing the placement of said detector arrays comprises means for fixedly locating each array at:

(a) a preselected angular orientation with respect to radial lines extending from the focal spot, and (b) a preselected radial distance from the focal spot, wherein portions of adjacent arrays overlap in the tangential direction so that the tangential spacing between adjacent detector arrays is approximately equal to the tangential spacing between adjacent detectors in a single array.

3. The x-ray scanning system of claim 2, wherein each of said detector arrays is fixedly positioned to be other than substantially perpendicular to radial lines extending from the focal spot, and wherein corresponding points of each of said arrays are located and secured at substantially the same radial distance from the focal spot.

4. The x-ray scanning system of claim 2 or 3, further comprising an anti-scatter plate assembly mounted on said support structure, said anti-scatter plate assembly including a plurality of anti-scatter plates disposed between the x-ray source and said detector assembly.

5. The x-ray scanning system of claim 4, wherein the anti-scatter plates are substantially aligned with radial lines extending from the focal spot.

6. The x-ray scanning system of claim 2, wherein each of said detector arrays is fixedly positioned to be substantially perpendicular to radial lines extending from the focal spot, and wherein adjacent detector arrays are located and secured at different radial distances from the focal spot.