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X-ray image capture device, wedge filter device, and wedge filter control method

A camera device, X-ray technology, applied in radiological diagnosis equipment, echo tomography, radiation/particle processing, etc., can solve the problems of increased noise and high risk of overflow, to reduce risk and narrow dynamic range Effect

Active Publication Date: 2014-06-04
TOSHIBA MEDICAL SYST CORP
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Therefore, in the data used for image reconstruction related to PCCT, high radiation dose data with a high risk of spillover and extremely low radiation dose data with high noise are mixed
When performing PCCT data collection under conditions designed to avoid spillover, where data of extremely small radiation doses are dominant, noise due to measurement errors increases

Method used

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  • X-ray image capture device, wedge filter device, and wedge filter control method
  • X-ray image capture device, wedge filter device, and wedge filter control method
  • X-ray image capture device, wedge filter device, and wedge filter control method

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Deformed example 1

[0080] In the above description, the filter module 39 is not limited to the configuration consisting of two wedge filters 391 . For example, when the minimum X-ray transmission path length is somewhat long, other types of filter modules can be used. Hereinafter, other filter blocks will be described. In addition, in the following description, the same code|symbol is attached|subjected to the component which has substantially the same function as a filter module, and it repeats description only when necessary.

[0081] Figure 16 is a perspective view of another filter module 39'. Such as Figure 16 As shown, another filter module 39' has 2 wedge filters 391 and 1 fixed filter 392. The 2 wedge filters 391 can move independently with respect to the channel direction, and the fixed filter 392 is fixedly supported by the module A mechanism 40 (not shown) supports it. As the material of the fixed filter 392 , any substance capable of attenuating the radiation dose of X-rays, s...

Deformed example 2）

[0084] In the above description, it is assumed that the filter shape calculation unit 54 calculates the shape of the flexible wedge filter using the calibration data for CT imaging. However, the method of calculating the shape of the flexible wedge filter is not limited to this. The filter shape calculation unit 54 according to Modification 2 calculates the flexible wedge filter shape data without using the calibration data for CT imaging. Hereinafter, calculation of the shape data of the flexible wedge filter according to Modification 2 will be described. In addition, in the following description, the same code|symbol is attached|subjected to the component which has substantially the same function as this embodiment, and it repeats description only when necessary.

[0085] Figure 18 It is a diagram showing a typical flow of the operation of the X-ray computed tomography apparatus 1 under the control of the system control unit 51 according to the second modification.

[00...

Deformed example 3）

[0095] In the above description, it is assumed that the direction to which the radiation dose value is equalized is the channel direction. However, this embodiment is not limited to this. That is, the direction to which the radiation dose value is equalized may be the column direction. Hereinafter, the flexible wedge filter in the case where the direction to which the radiation dose value is equalized is the column direction will be described. In addition, in the following description, the same code|symbol is attached|subjected to the component which has substantially the same function as this embodiment, and it repeats description only when necessary.

[0096] Figure 19 is a schematic perspective view of a flexible wedge filter 38' according to Modification 3, Figure 20 This is a plan view of a flexible wedge filter 38 ′ according to Modification 3 viewed from the column direction. Such as Figure 19 as well as Figure 20 As shown, the flexible wedge filter 38' has a ...

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Abstract

An objective of the present invention is to minimize overflow risk and reduce dynamic range. A PCCT data collection unit (42) collects a data set relating to an x-ray photon count for each of a plurality of energy bands included in an x-ray energy spectrum which is emitted from an x-ray tube (32). A flexible wedge filter (38) is positioned between the x-ray tube (32) and a subject (P) in order to attenuate x-ray dosage from the x-ray tube (32), and further comprises a plurality of filter modules which have configurations wherein x-ray transmission path lengths within an x-ray shield substance are individually variable. A PCCT support control unit (36) individually operates each of the plurality of filter modules in order to approximately spatially uniformly distribute the x-ray dosage which is emitted from the x-ray tube (32), transmitted through the subject (P), and detected by an x-ray detector (33).

Description

technical field [0001] Embodiments of the present invention relate to an X-ray imaging device, a wedge filter device, and a wedge filter control method. Background technique [0002] In X-ray CT (computed tomography), it is required to improve the quantification of CT values. As imaging methods for improving the quantification of CT values, for example, DECT (dual energy CT, dual energy CT) and PCCT (photon counting CT, photon counting CT) have been proposed and developed. DECT is an imaging method for easily classifying substances using projection data related to two types of X-ray energies. PCCT is an imaging method that further improves the quantification than DECT. As is well known, in PCCT, X-ray photons need to be measured one by one. In order to prevent spillover (loss of counts of X-ray photons. Pile-up) associated with X-ray photon measurements, the upper limit of X-ray radiation dose rate (radiation dose of X-rays per unit time and per unit area) must be set to ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): A61B6/03G21K3/00
CPCA61B6/035G21K1/046A61B6/03G21K1/10A61B6/4035A61B6/032A61B6/4233A61B6/4241A61B6/482A61B6/488A61B6/542A61B6/582
Inventor 齐藤泰男
Owner TOSHIBA MEDICAL SYST CORP
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