X-ray computed tomography apparatus
A tomography and X-ray technology, applied in computer tomography scanners, instruments for radiological diagnosis, diagnosis, etc., can solve problems such as reconstruction, confirmation, and deterioration of reconstructed image quality.
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Embodiment approach 1
[0039] Next, Embodiment 1 of the X-ray computed tomography apparatus of the present invention will be described with reference to the drawings. X-ray computed tomography apparatus includes: a rotation / rotation (ROTATE / ROTATE) type in which the X-ray tube and the X-ray detector are integrally rotated around the subject; The present invention can be applied to any of various types such as the STATIONARY / ROTATE type in which the X-ray tube rotates around the object to be examined. Here, it will be described as a rotary / rotary type currently in the mainstream. In addition, in order to reconstruct the tomographic image data of one slice (slice), projection data of about 360 degrees around the subject are required (full reconstruction method), and even the half reconstruction method requires 180 degrees + α (α : projection data of the size of fan angle). In this embodiment, a semi-reconstruction method effective for imaging a fast-moving heart or the like is employed.
[0040] In...
Embodiment approach 2
[0138] Next, a second embodiment of the X-ray computed tomography apparatus (also referred to as X-ray CT or CT scanner) of the present invention will be described with reference to the drawings. The X-ray computed tomography apparatus includes: a rotation / rotation (ROTATE / ROTATE) type in which an X-ray tube and a radiation detector are integrally rotated around an object; The present invention can be applied to any of various types such as a stationary / rotate type that rotates around the subject. Here, it will be described as a rotary / rotary type currently in the mainstream.
[0139] In addition, reconstruction methods include full reconstruction methods, semi-reconstruction methods, and segmental reconstruction methods. These reconstruction methods differ in the range of angles required to reconstruct one-slice tomographic data. The time required to rotate the X-ray tube to reconstruct the angular range required for one slice of tomographic data is called time resolution. ...
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