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
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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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