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Deadtime Correction Method Using Random Coincidence for PET

Department of Engineering for Medical Systems, Shimadzu Corporation, Kyoto
Division of Radiology and Nuclear Medicine, Research Institute of Brain and Blood Vessels, Akita, Japan

Correspondence: For reprints contact: Seiichi Yamamoto, Dept. of Engineering for Medical Systems, Shimadzu Corporation, 1, Nishinokyo-Kuwabaracho, Kyoto 604, Japan.

ABSTRACT

A deadtime correction method is proposed for quantitative measurements in positron emission tomography. The correction is based on the observation that a deadtime loss of the random coincidence events corresponds to that of the single events and of the total coincidence events. Using the proposed correction method, the deadtime loss was kept within 1% up to the true coincidence rate of 50 x 10³ cps per plane for a cylindrical phantom of 20 cm in diameter. Accuracy of the method is confirmed to be independent of the size of the object.