X-RAY CT DETECTOR AND X-RAY CT APPARATUS

• US 20120257715A1
• Filed: 12/09/2010
• Published: 10/11/2012
• Est. Priority Date: 12/16/2009
• Status: Active Grant

• Current Assignee: FUJIFILM Healthcare Corp. (Fujifilm Holdings Corporation)
• Original Assignee: Hitachi Medical Corporation (Hitachi, Ltd.)
• Inventors: Kobayashi, Hiroyuki
• Granted Patent: US 8,817,946 B2
• Time in Patent Office: Days
• US Class Current: 378/19
• CPC Class Codes: A61B 6/032 Transmission computed tomography [CT]
• CPC Class Codes: A61B 6/035 Mechanical aspects of CT
• CPC Class Codes: A61B 6/0487 Motor-assisted positioning
• CPC Class Codes: A61B 6/06 Diaphragms
• CPC Class Codes: A61B 6/42 Arrangements for detecting radiation specially adapted for radiation diagnosis
• CPC Class Codes: A61B 6/4233 using matrix detectors
• CPC Class Codes: A61B 6/4291 the detector being combined with a grid or grating
• CPC Class Codes: A61B 6/5282 due to scatter
• 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 1/025 using multiple collimators, e.g. Bucky screens; other devices for eliminating undesired or dispersed radiation

Abstract

There are provided an X-ray detector, which can reduce the deformation of a collimator plate and can be easily processed and installed, and an X-ray CT apparatus using it. The X-ray detector includes a collimator plate, and a scintillator array, a photoelectric conversion element array and a substrate that are bonded in order from the X-ray incidence direction. The collimator plate is disposed such that one of a pair of opposite sides of the collimator plate is bonded to a lower support plate bonded on the scintillator array and the other side is bonded to an upper support plate and directions of the opposite sides are the same as a rotation axis direction of an X-ray CT apparatus in which the X-ray detector is provided.

Claims

1. An X-ray CT apparatus comprising:

an X-ray source which emits X-rays to an object;

an X-ray detector which is disposed opposite the X-ray source in order to detect X-rays transmitted through the object;

a rotary disk in which the X-ray source and the X-ray detector are mounted and which rotates around the object;

an image reconstruction device which reconstructs a tomographic image of the object on the basis of the amount of transmitted X-rays detected by the X-ray detector; and

an image display device which displays the tomographic image reconstructed by the image reconstruction device,

wherein the X-ray detector has a collimator plate, and a scintillator array, a photoelectric conversion element array and a substrate that are bonded in order from an X-ray incidence direction, and

the collimator plate is disposed such that one of a pair of opposite sides of the collimator plate is bonded to a lower support plate bonded on the scintillator array and the other side is bonded to an upper support plate and directions of the opposite sides are the same as a rotation axis direction of the X-ray CT apparatus.

3. The X-ray CT apparatus according to claim 1,

wherein a pair of fixed pillars adjacent to two sides in a direction perpendicular to one side of the collimator plate bonded to the upper support plate are provided, and

at least one of the upper support plate and the lower support plate is bonded to the fixed pillars.

2. An X-ray CT apparatus comprising:

an X-ray source which emits X-rays to an object;

an X-ray detector which is disposed opposite the X-ray source in order to detect X-rays transmitted through the object;

a rotary disk in which the X-ray source and the X-ray detector are mounted and which rotates around the object;

an image reconstruction device which reconstructs a tomographic image of the object on the basis of the amount of transmitted X-rays detected by the X-ray detector; and

an image display device which displays the tomographic image reconstructed by the image reconstruction device,

wherein the X-ray detector has a collimator plate, and a scintillator array, a photoelectric conversion element array and a substrate that are bonded in order from an X-ray incidence direction, and

the collimator plate is disposed such that one of a pair of opposite sides of the collimator plate is bonded to an X-ray incidence surface of the scintillator array and the other side is bonded to an upper support plate and directions of the opposite sides are the same as a rotation axis direction of the X-ray CT apparatus.

4. The X-ray CT apparatus according to claim 2,

wherein a pair of fixed pillars adjacent to two sides in a direction perpendicular to one side of the collimator plate bonded to the upper support plate are provided, and

the upper support plate is bonded to the fixed pillars.

5. An X-ray detector comprising a collimator plate, and a scintillator array, a photoelectric conversion element array and a substrate that are bonded in order from an X-ray incidence direction, wherein in the collimator plate, one of a pair of opposite sides of the collimator plate is bonded to an X-ray incidence surface of the scintillator array and the other side is bonded to an upper support plate, and one place or a plurality of places of each of two sides of the collimator plate in a direction perpendicular to the opposite sides are bonded by a comb-shaped metal plate.

6. The X-ray detector according to claim 5,

wherein a pair of fixed pillars adjacent to two sides in a direction perpendicular to one side of the collimator plate bonded to the upper support plate are provided, and the upper support plate and the comb-shaped metal plate are bonded to the fixed pillars.

7. The X-ray detector according to claim 6,

wherein a slit is provided in an approximately middle portion of the fixed pillar so as to be approximately parallel to the substrate, and

the comb-shaped metal plate is bonded to the slit.

8. An X-ray CT apparatus comprising:

an X-ray source which emits X-rays to an object;

an X-ray detector which is disposed opposite the X-ray source in order to detect X-rays transmitted through the object;

a rotary disk in which the X-ray source and the X-ray detector are mounted and which rotates around the object;

an image reconstruction device which reconstructs a tomographic image of the object on the basis of the amount of transmitted X-rays detected by the X-ray detector; and

an image display device which displays the tomographic image reconstructed by the image reconstruction device,

wherein the X-ray detector is the X-ray detector according to claim 5.