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Quality control of nuclear medicine instruments and image correction

Author: LuXiang
Tutor: ZhaoShuJun
School: Zhengzhou University
Course: Measuring Technology and Instruments
Keywords: gamma photon Nuclear medicine equipment Photomultiplier tube Correction Quality Control Test
CLC: TH789
Type: Master's thesis
Year: 2005
Downloads: 159
Quote: 0
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Abstract


Nuclear medicine images functional imaging is widely used in the diagnosis of cancer , brain function and heart disease and other aspects . The image correction and quality control of nuclear medicine instruments for nuclear medicine image quality is essential . Collection of images of nuclear medicine instruments calibrated , you can not provide the correct information . A radiation event position information and energy information is closely related to the separation of the position information and energy information by the position correction can be realized . A serious distortion of the position of the scattered photon causes the detection event through the window set , we can rule out the scattered photons and the noise signal . Due to the features of the nuclear medical instruments in the calculation of the position information , the collected raw images Association online and uniformity of the deviation . Taken to build a correction table based on the spatial resolution of the nuclear medicine instrument using software correction . In order to improve the count of the image , we need to dead - time correction of the nuclear medicine images , we take pre - set the dead time and the acquisition time for dead time correction . Quality Control of nuclear medicine instruments eligibility is the credibility of the key image . Based on the testing requirements of NEMA standards , describes the spatial resolution , energy resolution , linearity and uniformity measurement method and automated data analysis . Detector after prolonged operation , the gain of the photomultiplier tube will change. When the photomultiplier tube gain drift , may cause a deviation of the position information , energy information , resulting in a drop in image quality . This article will deviate from the true position due to changes in the gain of the photomultiplier tube principle , the position information determined by the output of the photomultiplier tube according to the When the ECT photomultiplier tube array photomultiplier tube gain drift when ECT maintenance. For the maintenance of the PET probe only photomultiplier tube according to the respective photoelectric absorption probability of an event associated with the location of the event . By changes in the absorption probability of each photomultiplier tube , an approximate adjustment coefficient to calculate the gain of each photomultiplier tube through the microcontroller to adjust the hardware circuit , the automatic adjustment of the gain of each photomultiplier tube .

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CLC: > Industrial Technology > Machinery and Instrument Industry > Instruments, meters > Medical and health devices > Other medical devices
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