A real-time motion monitoring method based on CT scan based on projection image

A technology for real-time monitoring and projection images, applied in the field of medical image processing, can solve the problems of unknown effect and complicated operation, and achieve the effect of small calculation processing volume, high sensitivity and strong operability

Active Publication Date: 2018-04-03
天津金曦医疗设备有限公司
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Problems solved by technology

[0006] The purpose of the present invention is to overcome the disadvantages of complex operation and unknown effect of the existing reconstruction technology, and provide a CT projection image-based projection image-based CT that can timely and accurately judge the impact of patient motion on image quality, thereby avoiding unnecessary radiation doses to the greatest extent. real-time monitoring method

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  • A real-time motion monitoring method based on CT scan based on projection image
  • A real-time motion monitoring method based on CT scan based on projection image
  • A real-time motion monitoring method based on CT scan based on projection image

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Embodiment Construction

[0038] During CT scanning, the angle between two adjacent projections is very small, generally less than 0.4 degrees, and the maximum is about 1 degree, so the similarity of projection images is very high. If there is no motion in the scan, the similarity between the mean value of the preceding and following frames and the current frame is the highest, and the mutual information is the maximum value. Once motion occurs, the similarity decreases and the mutual information decreases.

[0039] The present invention processes the projection image of the patient in data collection in real time, and calculates the mutual information between the projection frame at the current moment and the mean value of the frames before and after. When the result is less than the set threshold, it is determined that the patient has moved, and the scan is terminated in time. The invention can stop scanning in time after motion occurs, avoiding unnecessary radiation dose to the greatest extent, and t...

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Abstract

The invention relates to the technical field of medical image processing, and discloses a CT real-time monitoring method based on a projection image. The method comprises the following steps: setting a mutual information experience threshold, acquiring the mutual information value of a CT scanning projection image of a patient in real time, comparing the mutual information value M of the current frame with the mutual information experience threshold P, and ending scanning if M<P. According to the invention, by processing the projection image of the patent in real time in data acquisition and comparing the measured mutual information value with the experience threshold, large movement of the patient can be found quickly and responsively, the influence of the movement on the quality of the image can be judged in real time, and scanning can be ended in time. The problem that the operation is complex and the effect is known for the existing reconstruction technology is solved, and unnecessary radiation dose is avoided to the maximum.

Description

technical field [0001] The invention relates to the technical field of medical image processing. The invention adopts the comparison between the measured mutual information value and the empirical threshold value, and can timely and accurately judge the influence of patient movement on the image quality, thereby avoiding unnecessary radiation dose to the greatest extent. CT real-time monitoring method of projected images. Background technique [0002] Computed tomography (CT) is an important non-destructive testing technology, which can obtain two-dimensional or three-dimensional images of the internal and external structural features of objects by using X-ray projection data from multiple projection angles. It has been widely used in clinical medical imaging diagnosis due to its advantages of non-destructive, high precision, and three-dimensional visualization. [0003] Mathematical models of computed tomography rely on the inherent assumption that the object being scanned...

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G06T7/246A61B6/03
CPCA61B6/03G06T2207/30196
Inventor 张励曹文田李军
Owner 天津金曦医疗设备有限公司
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