JPH04288147A - X-ray ct apparatus - Google Patents

Abstract

PURPOSE:To obtain numerous tomographic images at one rotation without being affected by motions of an object to be inspected by arranging a multi- focus X-ray tube having a plurality of focuses in a direction orthogonal to a photographing surface and a surface detector which can detect X rays irradiated from the respective focuses simultaneously. CONSTITUTION:A multi-focus X-ray tube 5 has a plurality of focuses arranged linearly in a longitudinal direction of an object 2 to be inspected and a collimator 7 is provided on the outgoing side thereof. In the emission of X rays, X rays are emitted to the object 2 to be inspected simultaneously from the respective focuses. A collimator 7 X rays emitted from the focuses are divided into parallel beams. Surface detectors 6 in which detectors comprising a plurality of channels are arranged in parallel only corresponding to the number of the focuses is disposed at the position opposite to the multi-focus X-ray tube 5 sandwiching the object 2 to be inspected. A transmission beam can be collected simultaneously as obtained after the X-ray beams emitted from the focuses of the multi-focus X-ray tube 5 are transmitted through the object 2 to be inspected. A rotary frame 9 is fixed with the multi-focus X-ray tube 5 opposed to the surface detector 6 and the rotary frame 9 is turned to scan.

Description

[Detailed description of the invention]

[Object of the invention]

0002

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an X-ray CT apparatus that simultaneously takes a plurality of tomographic images in one rotation.

0003

[Prior Art] Generally, when taking multiple tomographic images of a moving body part such as the heart using an X-ray CT device, it is necessary to repeat the rotation many times until the end of the image. Since it takes a long time to complete the process, the subject may move and a tomographic image useful for diagnosis cannot be obtained. Therefore, recently, X
Development of line CT equipment is progressing.

FIG. 3 shows a conventional example of such an X-ray CT apparatus, in which an X-ray tube 1 emits a cone beam 3 that spreads radially in the longitudinal direction of a subject 2. and,
After this cone beam 3 passes through the object 2, it passes through a surface detector 4, which is composed of a large number of detectors each having a plurality of channels.
Collected in

FIG. 4 is a view of the subject 2 viewed from the longitudinal direction, and the X-ray tube 1 and surface detector 4 rotate around the subject 2 to perform scanning.

[0006]

[Problems to be Solved by the Invention] However, in such a conventional method, since the X-rays emitted from the X-ray tube 1 are radial, as is clear from FIG. Even when taken, the tomographic images are not parallel. Therefore, in order to obtain parallel tomographic images, image processing such as interpolation processing must be performed, which not only requires a dedicated image processing function but also takes a lot of time. was there.

[0007] This invention was made in order to solve such conventional problems, and its purpose is to obtain an X
The purpose of the present invention is to provide a line CT device.

[Configuration of the invention]

[0009]

[Means for Solving the Problems] In order to achieve the above object, the present invention provides a multifocal X-ray tube having a plurality of focal points in a direction perpendicular to an imaging plane, and a system for emitting light from each focal point of the multifocal X-ray tube. It is characterized by having a surface detector that can simultaneously detect the X-rays.

0010

[Operation] With the construction as described above, X-rays emitted from each focal point of the multifocal X-ray tube pass through a plurality of photographed surfaces of the subject and are collected by the surface detector. Therefore, it becomes possible to simultaneously capture a plurality of tomographic images.

[0011]

DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of the present invention will be described below with reference to the drawings. FIG. 1 is a configuration diagram showing an X-ray CT apparatus to which the present invention is applied, and FIG. 2 is a front view of the same.

In FIGS. 1 and 2, the multifocal X-ray tube 5 is
It has a plurality of focal points arranged in a straight line in the longitudinal direction of the subject 2, and a collimator 7 is provided on the emission side. When the X-rays are emitted, the X-rays are simultaneously emitted from each focal point toward the subject 2. The collimator 7 separates the X-rays emitted from each focal point into parallel beams.

[0013] Further, at a position opposite to the multifocal X-ray tube 5 across the subject 2, there is disposed a surface detector 6 in which detectors each consisting of a plurality of channels are arranged in parallel in the number of focal points. , the transmitted rays after the X-ray beams emitted from each focus of the multifocal X-ray tube 5 pass through the subject 2 can be collected at the same time.

Further, the rotating frame 9 shown in FIG. 2 fixes the multifocal X-ray tube 5 and the surface detector 6 so as to face each other, and scanning is performed by rotating the rotating frame 9.

According to such a configuration, a plurality of parallel X
Line beams are emitted at the same time, and transmitted lines after passing through the subject 2 are collected by the surface detector 4 at the same time. Then, multiple tomographic images are simultaneously reconstructed based on this collected data.

Therefore, since multiple tomographic images can be taken simultaneously, images useful for diagnosis can be obtained without being affected by movement even when taking continuous tomographic images of a moving body part such as the heart. be able to. Furthermore, since all the X-rays emitted from the multifocal X-ray tube 5 are parallel beams, tomographic images can be obtained using a reconstruction algorithm in a normal X-ray CT device without any special image processing. Can be done.

[0017]

As explained above, in the present invention, a multifocal X-ray tube and a surface detector are used to photograph a subject. Therefore, a large number of tomographic images can be obtained with one rotation,
It is not affected by the movement of the subject.

Furthermore, since the X-rays emitted from each focal point of the multifocal X-ray tube are parallel beams, a tomographic image can be obtained using a normal reconstruction algorithm from transmitted X-rays collected by a surface detector. . Therefore, since image processing such as interpolation processing is not performed as in the conventional method, there is no need to provide a dedicated image processing function, and the effect of improving throughput can be obtained.

[Brief explanation of the drawing]

FIG. 1 is a configuration diagram showing an embodiment of an X-ray CT apparatus to which the present invention is applied.

FIG. 2 is a front view of the embodiment device.

FIG. 3 is a configuration diagram showing a conventional X-ray CT apparatus to which the present invention is not applied.

FIG. 4 is a front view of the conventional device.

[Explanation of symbols]

2. Subject 5 Multifocal X-ray tube 6. Surface detector 7 Collimator 8 Collimator

Claims (1)

[Claims] 1. A multifocal X-ray tube having a plurality of focal points in a direction perpendicular to an imaging surface, and a surface detector capable of simultaneously detecting X-rays emitted from each focal point of the multifocal X-ray tube. An X-ray CT apparatus comprising: