Method for improving zeugmatography system signal to noise ratio
A nuclear magnetic resonance imaging, signal-to-noise ratio technology, applied in medical science, sensors, diagnostic recording/measurement, etc., can solve problems such as nuclear magnetic resonance frequency and phase changes, and achieve the effect of improving accuracy and imaging quality
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Embodiment approach 1
[0019] Implementation mode one: if figure 1 As shown, the present invention removes the scanning artifacts caused by the mechanical vibration of the refrigerator in the nuclear magnetic resonance imaging system and improves the signal-to-noise ratio of the scanning signal. Carry out MRI scans during downtime, restart the refrigerator immediately after the scan is completed to condense the vaporized helium, remove the heat leaked into the system's cryogenic container during the scan, restart the refrigerator for refrigeration work, and perform MRI scans The period of time is equal to allow the refrigeration system to fully return to its original state; pausing the refrigerator and performing an MRI scan alternates with ending the MRI scan and resuming refrigeration of the refrigerator. Compared with the operation of performing an MRI scan while the cryocooler is running, the obtained image has removed the artifacts caused by the vibration of the cryocooler to improve the accura...
Embodiment approach 2
[0021] Implementation mode two: if figure 2 As shown, the present invention removes the scanning artifacts caused by the mechanical vibration of the refrigerator in the nuclear magnetic resonance imaging system and improves the signal-to-noise ratio of the scanning signal. During this period, the magnetic resonance imaging scan is performed, and the refrigerator is started immediately after the scanning to remove the heat leaked from the cryogenic container of the system during the scanning period. The working time of the refrigerator is 20% to 50% of the scanning time of the magnetic resonance imaging. The above two The process is regarded as a cycle, and then, suspending the refrigerator and performing the MRI scan and ending the MRI scan and resuming the refrigeration of the refrigerator are carried out alternately within the cycle time, and the control program is used to judge whether the above cycle meets the set time. The time set in the embodiment is 8-10 hours. When t...
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