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.
