Routine quarterly quality control (QQC) tests should be performed by a medical physicist for gamma camera with SPECT systems. In addition, periodical preventive maintenance (PPM), is done on quarterly basis by the gamma camera vendors' engineers to ensure safe and reliable nuclear medicine practice. Nevertheless, occasionally PPM and QQC tests may not be performed sequentially. This study highlights frequent QQC procedures after the PPM for gamma cameras with SPECT systems at KFSHRC

Nine QQC tests were performed immediately after PPM (before release of the gamma cameras for clinical use), for three gamma cameras with SPECT and two with SPECT/CT systems at KFSH&RC. These tests include; Intrinsic Energy Resolution, Intrinsic Flood Field Uniformity, Extrinsic Flood Field Uniformity, Total Tomographic Performance test, Intrinsic Count Rate Performance  in  Air,  System Spatial Resolution and Linearity, Whole Body System Spatial Resolution Without Scatter and Planar Sensitivity

The Extrinsic tests were performed using the Co-57 flood sheet. The intrinsic flood field uniformity was done for 10 and 15 million counts  while the extrinsic flood field uniformity tests was done only for 10 million counts

Bar phantoms were used to perform the spatial resolution and linearity as well as whole body spatial resolution. The count rate performance was completed using the copper sheet method.  The Total Tomographic Performance test was performed using Carlson phantom. The tests were calculated and analysed using a homemade Excel Microsoft sheet and others using visual evaluation