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http://dx.doi.org/10.7742/jksr.2020.14.1.15

Evaluation of Temperature and Humidity of a Thermo-Hygrostat of PET/CT Equipment using a Temperature and Humidity Sensor(BME 280)  

Ryu, Chan-Ju (Department of Nuclear Medicine, Bundang Cha Medical Center)
Kim, Jeong-A (Department of Radiological Science, Eulji University)
Kim, Jun-Su (Department of Radiological Science, Eulji University)
Yun, Geun-Yeong (Department of Radiological Science, Eulji University)
Heo, Seung-Hui (Department of Radiological Science, Eulji University)
Hong, Seong-Jong (Department of Healthcare, Graduate School, Eulji University)
Publication Information
Journal of the Korean Society of Radiology / v.14, no.1, 2020 , pp. 15-22 More about this Journal
Abstract
PET(Positron Emission Tomography) devices are used as PET/CT or PET/MRI devices fused with the devices of CT or MRI for obtaining anatomical information. Therefore, the devices are constructed in circular ring-type structure whose length of gantry(the main part of filming) becomes wider and the interior depth becomes longer in comparison to other common medical equipments. scintillator, one of the components in PET devices, is inside the gantry, and as it is consisted of crystal which is sensitive to the change of temperature and humidity, large temperature change can cause the scintillator to be damaged. Though scintillator located inside the gantry maintains temperature and humidity with a thermo-hygrostat, changes in temperature and humidity are expected due to structural reasons. The output value was measured by dividing the inside of the gantry of the PET/CT device into six zones, each of which an Adafruit BME 280 temperature and humidity sensor was placed at. A thermo-hygrostat keeps the temperature and humidity constant in the PET/CT room. As the measured value of temperature and humidity of the sensor was obtained, the measured value of temperature and humidity appeared in the thermohygrostat was taken at the same time. Comparing the average measured values of temperature and humidity measured at each six zones with the average values of the thermo-hygrostat results in a difference of 2.71℃ in temperature and 21.5% in humidity. The measured temperature and humidity of PET Gantry is out of domestic quality control range. According to the results of the study, if there is continuous change in temperature and humidity in the future, the aging of the scintillator mounted in the PET Gantry is expected to be aging, so it is necessary to find a way to properly maintain the temperature and humidity inside the Gantry structure.
Keywords
PET/CT; thermo-hygrostat; temperature and humidity sensor;
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