A Method of Using Projection Data to Remove Ring Artifacts Caused by CT Detector Faults
A technology of projection data and ring artifacts, which is applied in the field of medical image processing, can solve problems such as the inability to accurately estimate missing information, and the inability to well remove CT image ring artifacts, etc.
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example 1
[0030] figure 1 The projected sinusoidal image of a human head with a size of 256×256 obtained for a faulty flat panel detector with 367 CT detection elements, wherein the number of consecutive faulty CT detection elements of the faulty flat panel detector is 21, and located at the Columns 120 to 140 (failure rate 21 / 367=5.7%). figure 1 The image shown is obtained in an orbital CT imaging system, wherein the distance from the focal point of the radiation source of the CT imaging system to the system rotation center is 500 mm, and the distance from the system rotation center to the detector is 500 mm. figure 1 The image shown is the projection data of 720 angles obtained by using the above-mentioned circular orbit CT imaging system to collect once at intervals of 0.5 degrees within a range of 360 degrees. The obtained projection data are directly reconstructed by filtered back projection to obtain the following figure 2 CT image shown. Depend on figure 2 It can be seen th...
example 2
[0053] In order to further verify the technical effect of the ring artifact removal method of the present invention, the inventor has also done the following research:
[0054] 1. Obtain a comparison image
[0055] (A) The projected sinusoidal matrices obtained in the 1st and 2nd iterations of step (5) of Example 1 are respectively subjected to filtered back-projection reconstruction, and the results are as follows Figure 5 shown in a and 5b.
[0056] (B) According to the same method as example 1, deal with it separately Image 6 a and Figure 7 The CT projection data corresponding to a, the reconstruction result is as follows Image 6 c and Figure 7 as shown in c. in, Image 6 a is the CT image obtained when the detectors in the 120th row to the 130th row have continuous failures (failure rate 11 / 367=3%), Figure 7 a is the CT image obtained when the detectors in the 80th row to the 180th row have continuous faults (failure rate 101 / 367=27.52%); Image 6 a and Fig...
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