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Data processing method, data processing apparatus, and X-ray CT apparatus

A data processing device and data processing technology, which are applied in the fields of X-ray CT device, front projection processing and back projection processing, can solve the problems of uneven processing, increase of image noise, high frequency error, etc., and achieve high frequency error suppression. Effect

Inactive Publication Date: 2017-04-19
HITACHI LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

As a result, the utilization efficiency of the projection data will be reduced, and the image noise will increase
In addition, in the pixel-driven type and the beam-driven type, whether or not to use pixels (beams) changes depending on the angle at which the back projection is performed, so processing unevenness occurs
If this situation is repeated successively, there is a problem that high-frequency errors will occur

Method used

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  • Data processing method, data processing apparatus, and X-ray CT apparatus
  • Data processing method, data processing apparatus, and X-ray CT apparatus
  • Data processing method, data processing apparatus, and X-ray CT apparatus

Examples

Experimental program
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Effect test

no. 1 approach

[0036] First, refer to figure 1 The overall configuration of the X-ray CT apparatus 1 will be described.

[0037] Such as figure 1 As shown, the X-ray CT apparatus 1 includes a gantry unit 100 , a bed 105 , and a console 120 . The gantry unit 100 is a device that irradiates an object with X-rays and detects the X-rays transmitted through the object. The console 120 is a device that controls each part of the gantry unit 100 and acquires transmission X-ray data measured by the gantry unit 100 to generate an image. The bed 105 is a device for placing the subject and transporting the subject in / out of the X-ray irradiation range of the gantry unit 100 .

[0038] The gantry unit 100 includes an X-ray source 101 , a rotating disk 102 , a collimator 103 , an X-ray detector 106 , a data collection device 107 , a gantry control device 108 , a bed control device 109 , and an X-ray control device 110 .

[0039] The console 120 includes an input device 121 , an image processing device (...

no. 2 approach

[0085] Next, refer to Figure 5 A second embodiment of the present invention will be described. In the second embodiment, an example will be described in which an image is generated by successive approximate reconstruction processing including forward projection processing in consideration of overlap between adjacent pixels. Note that, in the following description, the details of the back projection in consideration of the overlap between adjacent pixels are the same as those in the first embodiment, and thus redundant description thereof will be omitted.

[0086] First, imaging conditions and reconstruction conditions are input from the input device 121 of the X-ray CT apparatus 1, and the subject is imaged. Imaging conditions and reconstruction conditions are the same as those in the first embodiment described above.

[0087] The image processing device 122 acquires projection data obtained by imaging, executes image reconstruction processing based on the reconstruction co...

no. 3 approach

[0109] Next, refer to Figure 6 ~ Figure 10 A third embodiment of the present invention will be described.

[0110] Generally speaking, if Figure 6 As shown, in distance-driven back projection, the beam intervals of the beams 30a, 30b, and 30c irradiated from the X-ray source 101 are made consistent with the beam width, and the distance from the X-ray source 101 to the pixel position is set to be the same. The distances 41 , 42 correspond to the dimensions of the beam windows 38 , 39 .

[0111] Adjacent beams 30a, 30b, 30c are arranged continuously without overlapping.

[0112] In contrast, in practice, the beam irradiated from the X-ray source 101 is irradiated with an area. This is because, if Figure 7 As shown, the focal point of the X-ray source 101 is actually not a point, but has a certain size (area). Therefore, if Figure 7 As shown in (a), beams 31 a , 31 b , 31 c having areas are emitted from the radiation source, and the adjacent beams 31 a , 31 b , 31 c ove...

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Abstract

Provided are a data processing method and others wherein since nearby pixels or beams may overlap each other in a back projection process or forward projection process for an image reconstruction, calculations taking into account such overlapping of pixels or beams are performed, thereby uniformly using data, whereby the occurrence of high frequency errors, such as moire and the like, can be suppressed. For this purpose, in a process of reconstructing an image from projection data, an image processing apparatus (122) performs a back projection process or forward projection process in which the pixel size is set to be wider than the pixel interval and in which a size-dependent weight (pixel window) that is in accordance with the amount of overlapping of nearby pixels is used to calculate an interpolation value to be applied to the pixels or beams, and the image processing apparatus (122) also performs a back projection process or forward projection process in which the beam size is set to be wider than the beam interval and in which a size-dependent weight (beam window) that is in accordance with the amount of overlapping of nearby beams is used to calculate an interpolation value to be applied to the pixels or beams.

Description

technical field [0001] The present invention relates to a data processing method, a data processing device, and an X-ray CT device. Specifically, it relates to front projection processing and back projection processing in image reconstruction processing. Background technique [0002] Conventionally, as a method of reconstructing a tomographic image from measurement data obtained by an X-ray CT (Computed Tomography: Computed Tomography) apparatus or the like, an analytical method such as a filter-corrected back-projection method, or an iterative approximation method has been used. For example, in the successive approximation reconstruction method, by repeating the back projection process of generating an image from the projection data and the forward projection process of performing line integration on the projection line from the image for a given number of iterations, the optimal close image. As back projection processing and front projection processing performed in these ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): A61B6/03G06T1/00
CPCA61B6/5205G06T11/006G06T2211/424A61B6/032A61B6/0487A61B6/5294A61B6/545G06T11/003
Inventor 后藤大雅高桥悠广川浩一
Owner HITACHI LTD
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