A method and system for establishing a detector crystal position table
A detection method and a technology for establishing a method, which can be applied to measuring devices, instruments, scientific instruments, etc., can solve problems such as unsatisfactory NSD segmentation results, reduce the time spent on manual inspection and correction, and improve accuracy.
Active Publication Date: 2019-08-23
SHANGHAI UNITED IMAGING HEALTHCARE
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Even so, the segmentation effect of NSD is still unsatisfactory when the rows and columns are seriously distorted or the crystals are glued together.
[0011] Although a large number of crystal detection algorithms exist, each algorithm has its applicable limitations
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[0033] The present invention will be further described below in conjunction with the accompanying drawings and embodiments.
[0034] Such as Figure 1-5 As shown, the detector of the PET system in the embodiment of the present invention is composed of a detector unit 1 , a sampling unit 2 , a storage unit 3 , a control and data processing unit 4 and a display unit 5 .
[0035] Detector unit 1 includes 400 to 500 crystal arrays, each array has 16*16 total 256 LYSO crystals, and the physical size of the crystals is 2.3*2.3mm 2 . LYSO crystal array coupled light guide and position sensitive photomultiplier tube. The incident photon is converted into a scintillation pulse signal by the detector unit, and the position pulse signal is digitally sampled in the sampling unit 2, and the sampling result is placed in the storage unit 3, and the control and data processing unit 4 can be a CPU, DSP, or a single-chip microcomputer. After the sampling results in the storage unit 3 are pro...
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The invention discloses a detector crystal position table establishing method and a detector crystal position table establishing system. The detector crystal position table establishing method comprises steps that according to positron annihilation example distribution, a 2D flood histogram image used to reflect crystal array distribution is formed after statistics; a plurality of detection methods are used to detect the crystals of the 2D flood histogram image respectively to acquire corresponding number and type determining results; the corresponding number and type determining results are integrated together, and parts without requiring correction and parts requiring correction of integration results are determined according to the confidence level of the determining results after the integration; the parts requiring the correction of the integration results are corrected to acquire the corrected determining results; the corrected determining results are used to segment the crystals of the 2D flood histogram image, and then the crystal position table is acquired. The plurality of detection methods are effectively integrated together, and strong points are adopted at the same time of overcoming the weak points, and therefore most of detection errors are corrected automatically, and accuracy of crystal automatic segmentation is improved.
Description
[0001] 【Technical field】 [0002] The invention relates to the field of positron emission tomography (PET) imaging, in particular to a method and system for establishing a detector crystal position table of a positron emission tomography imaging system. [0003] 【Background technique】 [0004] In a PET system, the part that most directly affects the image resolution is the detector part. PET detectors are mostly composed of scintillation crystals coupled with photomultiplier tubes. After the positron annihilation event is decoded by the pixel array of the PET detector, the position distribution of the event is generated, and after statistics, a two-dimensional histogram (2D flood histogram image, hereinafter referred to as FHI) reflecting the distribution of the crystal array is formed. Non-linear, making the generated FHI irregular. Compared with the traditional PET system, the number of scintillation crystals in the high-resolution PET system is increased, the size is reduc...
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IPC IPC(8): G01T1/202
Inventor 周鑫李丽平李强
Owner SHANGHAI UNITED IMAGING HEALTHCARE