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X-ray CT device, image processing device and image reconstruction method

A technology of X-ray and radiation dose, applied in the field of image reconstruction processing of projection data, which can solve problems such as image quality deviation

Active Publication Date: 2018-10-16
HITACHI HEALTHCARE MFG LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Therefore, for example, in the case of reconstructing an image of all phases for observing the passage of time of the subject, the difference in the image quality due to the difference in the amount of X-rays will occur depending on the phase.

Method used

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  • X-ray CT device, image processing device and image reconstruction method
  • X-ray CT device, image processing device and image reconstruction method
  • X-ray CT device, image processing device and image reconstruction method

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Experimental program
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Effect test

no. 1 Embodiment approach

[0035] First, refer to figure 1 The overall configuration of the X-ray CT apparatus 1 will be described.

[0036] Such as figure 1 As shown, the X-ray CT apparatus 1 includes a scanning stage unit 100, a bed 105, a console 120, and a biological signal measurement device 130. The scanning gantry 100 is an apparatus that irradiates an object with X-rays and detects X-rays transmitted through the object. The console 120 is a device that controls each part of the scanning gantry 100 and acquires transmitted X-ray data measured by the scanning gantry 100 to generate an image. The bed 105 is a device that carries the subject and carries the subject in and out within the X-ray irradiation range of the scanning gantry 100. The biological signal measurement device 130 is a device that measures data related to the movement of a biological body, such as an electrocardiometer, a respirometer, and the like.

[0037] The scanning stage unit 100 includes an X-ray source 101, a turntable 102, a ...

no. 2 Embodiment approach

[0114] Next, refer to Figure 10 ~ Figure 12 The second embodiment of the present invention will be described.

[0115] The image quality improvement effect of the image quality improvement process is limited, and there may be a relationship between the reference radiation dose and the amount of radiation at the time of shooting of the projection data that is the reconstruction target, and no matter which image quality improvement process is used. Improve to the standard image quality. For this reason, in the second embodiment, the system control device 124a of the X-ray CT apparatus 1 refers to the image quality improvement table 3 stored in the storage device 123, and obtains the lower limit value of the low dose value in advance before imaging. The ray dose modulation range setting limit.

[0116] The hardware configuration of the X-ray CT apparatus 1 of the second embodiment is figure 1 the same. In the following description, the same reference numerals are given to the same ...

no. 3 Embodiment approach

[0135] Next, refer to Figure 13 ~ Figure 15 The third embodiment of the present invention will be described.

[0136] In the first embodiment, the procedure of the image quality improvement process in the image reconstruction process at the time of shooting of the subject is exemplified, but the image quality improvement process of the present invention can also be applied to projection data captured in advance and stored in the storage device 123 . In addition, in the first embodiment, the image quality as a reference is determined by the selection of the dose value or the phase, but it is also possible to display the images of each phase actually reconstructed through a moving image display or a list display, and specify them as the reference (Target) image quality.

[0137] In the third embodiment, it is also possible to describe the application of the image quality improvement process to the stored projection data and the setting of the target image quality.

[0138] The hard...

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Abstract

In order to provide an X-ray CT apparatus or the like capable of performing reconstruction so that the image quality is the same in the entire interval when reconstructing an image using projection data mixed in a low-dose irradiation interval and a high-dose irradiation interval, the X-ray CT apparatus (1) An image quality improvement table (3) indicating an effect level of image quality improvement for a plurality of image quality improvement processes is held in a storage device (123). In the case of performing imaging while modulating the X-ray irradiation dose based on given radiation dose modulation data, the image processing device (122) acquires a reference radiation dose as a reference of image quality, and for the projection data to be the object of image reconstruction , obtain the dose of X-ray irradiation during shooting from the radiation dose modulation data, and the image processing device (122) refers to the image quality improvement table (3) according to the ratio of these radiation dose values ​​to determine the image used to obtain the image quality as a reference In the quality improvement process, the determined image quality improvement process is performed on the projection data to be reconstructed.

Description

Technical field [0001] The present invention relates to an X-ray CT apparatus, an image processing apparatus, and an image reconstruction method, and more specifically, to an image reconstruction process using projection data obtained by modulating the amount of irradiated X-rays. Background technique [0002] In the prior art, when an X-ray CT (Computed Tomography; tomography) device is used to capture a moving part, artifacts caused by the motion may be generated in the obtained tomographic image. In order to reduce the artifacts, biosensors such as electrocardiometers and respiration sensors are generally used to measure physiological movements together, and the obtained measurement signals are used to control shooting or image processing. For example, in imaging of the heart, the ECG synchronization reconstruction method is adopted. In this method, based on the ECG information measured by the electrocardiograph, projection data of phases with little motion are collected to re...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): A61B6/03
CPCA61B6/032A61B6/5205G06T11/005A61B6/465A61B6/5258A61B6/541A61B6/527A61B6/542G06T11/008A61B6/035A61B6/461
Inventor 石井直角村卓是
Owner HITACHI HEALTHCARE MFG LTD
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