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X-ray ct apparatus

An X-ray, central position technology, applied in the direction of diaphragm for radiation diagnosis, radiation/particle processing, instruments for radiation diagnosis, etc., can solve the problem of high price

Active Publication Date: 2012-10-24
TOSHIBA MEDICAL SYST CORP
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, since the price is very high compared with general optical systems that do not have an opening and closing mechanism divided into two axes, it is expected to realize the dynamic collimation operation with an inexpensive slit mechanism that simultaneously performs opening and closing operations.

Method used

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Experimental program
Comparison scheme
Effect test

no. 1 approach ）

[0021] figure 1 The X-ray CT apparatus in the first embodiment is shown. The X-ray CT apparatus of this embodiment has: a gantry (gantry) 11 for scanning the subject P (patient) with X-rays; a bed 12 for moving the subject P into the gantry 11; a system The control unit 13 controls the entire X-ray CT apparatus; and the reconstruction unit 14 as a computer processes projection data obtained from the gantry 11 and reconstructs it into a medical image.

[0022] The gantry 11 is composed of a rotating part 15 that rotates around a subject P (patient) and a fixed part 16 other than that. The rotating part 15 has: an X-ray tube 111, which generates X-rays; a wedge 112, which adjusts the radiation distribution of the X-rays generated from the X-ray tube 111 in the direction of the fan angle; an X-ray detector 113, which detects the transmitted X-rays. X-ray of body P (patient); data acquisition device (DAS: Data Acquisition System) 114, which converts the detection data of X-ray d...

no. 2 approach ）

[0044] Figure 6 A modified example of the wedge is shown. Figure 6 (a) shows a perspective view, Figure 6 (b) is a cross-sectional view of a Z-Z' axis indicated by a dotted line as viewed along XX'.

[0045] In the first embodiment, the X-ray shield 22 is arranged on the upper portion of the wedge 21 (on the side of the X-ray tube 111 ), but in this embodiment, the X-ray shield 62 is arranged on the side of the wedge 61 .

[0046] When disposing the X-ray shield 62 on the side surface of the wedge 61, the thickness t and the height h of the X-ray shield 62 are determined in consideration of the spread of the X-ray beam. The width w is set to be substantially the same as the width of the wedge 61 . In addition, in the first embodiment, in order not to change the shape of the opening of the wedge 21 , the X-ray shield 22 is additionally arranged on the X-ray tube 111 side of the wedge 21 . Therefore, although the mechanical size of the wedge 21 can be changed, in this emb...

no. 3 approach ）

[0049] According to the specifications of the X-ray CT apparatus, there is a type in which the position information of the wedge is reset to return the wedge position to the original position in order to ensure the position accuracy of the wedge when the wedge is driven. In an X-ray CT device of this specification, the dynamic collimation action of this embodiment cannot be realized within the scan cycle time. Therefore, by comparing the X-ray shielding position located outside the reconstruction range and the wedge center position in the reconstruction range The movement action between is realized by adding a new position detection method.

[0050] use Figure 7 The wedge drive unit 117 of the X-ray CT apparatus according to this embodiment will be described.

[0051] Such as Figure 7 As shown, there are: a ladder-shaped pattern 71, which is arranged on the top or side of the wedge 112 for position detection; a position detection part 73, which detects the position of the ...

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Abstract

There is provided an X-ray CT apparatus including: an X-ray source; a wedge which is disposed between the X-ray source and a subject and in which a shield blocking a part of an X ray is formed; a wedge driving unit for moving position of the wedge; and a system control unit controlling the wedge driving unit during a scan execution period to control the position of the wedge.

Description

technical field [0001] An embodiment of the present invention relates to an X-ray CT apparatus. Background technique [0002] Inside the gantry of the existing X-ray CT (Computed Tomography) apparatus, there is a collimator in front of the X-ray tube irradiated area. In this collimator, there are wedges to adjust the interception of soft rays and the intensity distribution of X-rays, and a slit mechanism that opens and closes according to the thickness of the slice during scanning. The optimized fan beam irradiates the subject with X-rays. [0003] When this slit mechanism has an opening and closing mechanism divided into two axes that operate independently on the left and right, in order to suppress unnecessary X-ray irradiation that occurs before and after scanning, the opening and closing timings of the left and right slits are changed to control the opening width and the opening and closing timing. Its position, so that the dynamic collimation (active collimation) acti...

Claims

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Application Information

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IPC IPC(8): A61B6/03
CPCA61B6/547G21K1/10A61B6/4078A61B6/06A61B6/03A61B6/027A61B6/032A61B6/107A61B6/542G21K1/02
Inventor 太田聪君岛荣
Owner TOSHIBA MEDICAL SYST CORP
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