x-ray computed tomography device
A technology of tomography and X-rays, which is applied in computerized tomography scanners, diaphragms for radiation diagnosis, instruments for radiation diagnosis, etc., and can solve problems such as inability to accurately reconstruct tomographic images
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no. 1 approach ＞
[0033] figure 1 is a block diagram showing the configuration of the X-ray CT apparatus of the first embodiment, figure 2 is a schematic diagram showing a schematic configuration of the X-ray CT apparatus. Such as figure 1 As mentioned above, the X-ray CT apparatus is electrically connected to the gantry (scanning gantry) 4 and the console 6 . In addition, the X-ray CT apparatus has a bed 5 on which the subject P is placed. The gantry 4 houses the pair of the X-ray system 1 , the optical system 2 , and the detection system 3 , and also houses a rotation support mechanism (not shown) that rotates the pair around the body axis of the subject P on the bed 5 . The rotation support mechanism includes a rotation ring, a ring support mechanism that rotatably supports the rotation ring about a rotation axis Z, and a drive unit that drives rotation of the ring. An X-ray tube 12 and an X-ray detector 31 also called a two-dimensional array type or a multi-row type are mounted on the ...
no. 2 approach ＞
[0086] Next, refer to figure 1 , the X-ray CT apparatus of the second embodiment will be described.
[0087] The second embodiment is a modified example of the first embodiment, and uses a kV conversion method that switches the tube voltage between a high voltage (for example, 135 kV) and a low voltage (for example, 80 kV) for each angle of view during photography.
[0088]Accordingly, as the X-ray tube 12 , an X-ray tube driven while temporally modulating the tube voltage is used.
[0089] In addition, the correction processing unit 62 has a function of estimating the temporally modulated tube voltage based on the comparison of the energy spectra of the second count data and a plurality of reference count data.
[0090] Here, as the second count data to be compared, as in Figure 5 As an example shown in , using the average of a plurality of second count data obtained at a plurality of time points (for example, t1 to t5) within one view (view) with the same target value of ...
no. 3 approach ＞
[0102] Next, for the X-ray CT apparatus of the third embodiment, refer to figure 1 Be explained.
[0103] The third embodiment is a modified example of the first or second embodiment. For example, the area of the first X-ray detector and the second X-ray detector 31a, 31b can be changed according to the size of the subject P or the like.
[0104] If supplemented, the first X-ray detector and the second X-ray detectors 31a and 31b divide the X-ray detector 31 into two areas and use them. However, this division may be inappropriate depending on the body size of the subject P or the like. For example, depending on the size of the subject P or the like, a part of the subject P may cover the second region corresponding to the second X-ray detector 31b.
[0105] Therefore, in this embodiment, the areas of the first X-ray detector and the second X-ray detector 31a, 31b can be changed. For example, the area of the second X-ray detector 31b may be changed from the left end area ...
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