¹³N-ammonia 심장 PET 검사에서 ECG gated scan의 유용성 평가

Evaluation about a Usefulness of ECG-Gated Scan on ¹³N-ammonia PET

Purpose Because of heart movement, PET image of heart is very blur. So, PET scan gated with ECG is necessary to improve a spatial resolution of heart PET image. In this study, we will evaluate a image quality of both gated 13N-ammonia PET scan and non-gated one. Materials and Methods Before start a heart PET, we attached a ECG electrode on patients (n = 5, aged = 54 ± 17). And we started a list mode PET scan that used by a mCT40 PET/CT (siemens, germany) during 10 minute, injected ¹³N-ammonia (378 ± 50 MBq) to a patients at same time. By using this list mode data, we reconstructed both gated PET image and non-gated PET image. Then we analysed a profiles of those images, performed a blind test, and subtracted a gated image on non-gated image. Results FWHM of a gated image is improved about 23% and there is a differency count distribution at a subtracted image from non-gated image to a gated image. But in case of blind test, everybody select the gated image as a better quality among each images. Conclusion As a result, we can find that image quality will improve by using gated PET scan. In additional, we can calculate a EF valve, apply QGS, QPS of PET. Therefore, the gated PET scan help improving an accuracy, applying a more information for a diagnosis.