Evaluation of Performance of the Gamma Camera in Nuclear Medicine Department in the National Cancer Institute –Al Gezira University

Abstract

This study was performed to evaluate the performance of gamma camera machine in Nuclear Medicine Department at the National Cancer Institute of Al-Gezira University . Quality control tests including ; Uniformity , Sensitivity and linearity were done . The study was conducted in the period between March to May 2017 . The data of the uniformity test were collected experimentally by preparing 200μCi of TC -99m and its volume was 0.5mL then we put the point source at the 2m distance from the detector and from the main menu we choose patient study then we choose F3 ,the computer well calculated the uniformity . The activity used in the sensitivity was 1mCi and we use a collimator Low Energy High Resolution (LEHR). The data of the linearity test were collected by using linearity phantom then we put the point source at the 2m distance from the detector and from the main menu we choose patient study then we choose F3 ,the computer well calculated the linearity . then the results were compared with the International Standard and we found that they were within the acceptable range . The results revealed that the differential Uniformity UFOV , CFOV were 1.6% for both of them which were within the acceptable value as well as the integral Uniformity UFOV and the CFOV were 2.0% for both of them . Also the result showed the average of sensitivity and we found that the current sensitivity was 84.382166 cps/μBq and new sensitivity 87.828936 cps/μBq and the sensitivity compared with NEMA2001 should be greater than 70 cps/μBq . In addition to that the results revealed the data of central field of view for linearity test and we found that the Intrinsic Spatial resolution (ISR) in x was 1.18mm and in y was 1.19mm and the average was 1.18mm . The Absolute spatial linearity ( ASL) in x was 1mm and in y was 0.94mm and the standard was 0.5 mm in both X and Y and Differential spatial linearity(DSL)in x was 0.17 mm and in y was o.21mm and the standard was 0.25 mm in both X and Y . V Also the result demonstrated the data of the useful of view for head(2)we found that the Intrinsic Spatial resolution( ISR) in x was 1.22 mm and in y was 1.21mm and the average was 1.22 mm and the Absolute spatial linearity (ASL )in x was1.00mm and in y is 0.94mm and the standard was 0.17 mm , 0.17mm for both and DSL in x was 0.17 mm and in y was 0.21 mm and the standard is 0.25mm for both.