Method for modulating tube current based on topogram
A technology of positioning sheet and modulating tube, which is applied to instruments, electrical components, computed tomography scanners, etc. for radiological diagnosis, which can solve the problems of high hardware performance requirements and large data processing capacity.
Pending Publication Date: 2021-09-10
FMI MEDICAL SYST CO LTD
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However, while considering the length of the ray path, it also combines the position information of various parts of the human body, the amount of data processing is large, and the performance requirements of the hardware are relatively high.
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[0059] In order to illustrate the embodiments of the present invention more clearly, the specific implementation manners of the present invention will be described below with reference to the accompanying drawings. Obviously, the accompanying drawings in the following description are only some embodiments of the present invention, and those skilled in the art can obtain other accompanying drawings based on these drawings and obtain other implementations.
[0060] The method for modulating tube current based on the spacer of the present invention uses a single-angle spacer (0 degree or 90 degree) to calculate the position of each pixel point in the Z direction (that is, the extension direction of the scanning bed) and the distance between the ball tube and the image scanning center. The size of the tube current required at each angle between the connecting line of the line and the Y direction (vertical direction), and then control the size of the required radiation dose, realiz...
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The invention relates to a method for modulating the tube current based on topogram, and the method comprises the following steps of: S1, acquiring a topogram image, and calculating the area of an equivalent circular water phantom corresponding to each pixel point in a Z direction according to the topogram image; S2, obtaining the radius of the equivalent circular water phantom corresponding to each pixel point according to the area of the equivalent circular water phantom corresponding to each pixel point; S3, fitting the radius of the equivalent circular water phantom and the set noise value into the standard distribution of the noise value along with the change of the tube current under different standard water phantom radiuses to obtain a change curve of the tube current along the Z direction; S4, according to the change curve of the tube current along with the Z direction, combining the change of the included angle between the connecting line between the bulb tube and the image scanning center and the Y direction to obtain the change curve of the tube current along with the included angle; and S5, modulating the tube current according to the changing curve of the tube current along with the included angle. According to the invention, corresponding tube current is modulated for each part, so that the image noise is close, and the image quality is improved.
Description
technical field [0001] The invention belongs to the technical field of computerized tomography, and in particular relates to a method for modulating tube current based on a spacer. Background technique [0002] The automatic exposure control technology is a new technology aimed at reducing the radiation dose of the subject while ensuring the image quality. It automatically adjusts the tube current to the size and thickness of the scanned object without fixing the tube current value. Therefore, the radiation dose efficiency can be improved and the image noise can be kept at a low level to ensure the stability of the image quality. [0003] In order to meet the scanning requirements of different parts, reduce the overall scanning dose, and improve the imaging quality of each part, it is necessary to modulate the tube current. For example, the patent document with the publication number CN112494062A discloses a method for modulating tube current based on human body parts, whic...
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IPC IPC(8): A61B6/03H05G1/34
CPCA61B6/032A61B6/40A61B6/54A61B6/545H05G1/34
Inventor 徐亦飞刘健宏陈伟
Owner FMI MEDICAL SYST CO LTD