Maximum posteriori optimizing image rebuilding method in PET imaging
A technique of maximum a posteriori image reconstruction, applied in the field of medical image processing
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[0032] The present invention implements four steps (see Image 6 ),details as follows:
[0033] 1. Use the PET imaging system to collect the detector data before imaging. The specific collection method can be flexibly set by the user. The data acquisition method in the experiment is designed as follows: 128 radial samples and 128 angular samples are taken within an angle interval of 180°; the system matrix A corresponds to the parallel beam ribbon integral geometry model. Store sampled data in an array.
[0034] 2. Data correction. Calibration coefficients for scan time, detector efficiency, attenuation coefficients and dead time correction coefficients obtained by the system c i and all detected random and scatter counts r i . According to parameter c i and r i Correction of detector data is performed to obtain data for generalized Gibbs prior maximum a posteriori image reconstruction.
[0035] 3. Build an image reconstruction model. Using the maximum a posteriori m...
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