الفهرس 
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Abstract
Radionuclide renal imaging studies using Gamma camera, were performed for 68 kidneys over a period of three years. The effect of pixel size, frame time and energy window for 99m Tc on renal imaging has been studied. The measurements have been taken at different backgrounds & time intervals and renogram analysis has been done. 99m Tc-Mercaptotriglycine Radiopharmaceutical (99mTc-MAG3) has been used in the present work. No statistical significant differences were found between the values of Differential Renal Functions (DRF) measured at different backgrounds and also between those measured at different time intervals. The average and the standard deviations of the maximum & half-life times (Tmax and T1/2 ) for normal and obstructive cases were calculated. - For normal cases the average values of Tmax & T1/2 were equal 3.48 and 4.72 mins, respectively. - For obstructive cases the average value of Tmax was 15.25 min, where the kidney has longer transit time. The time was delayed due to obstruction of the kidney. It was found that: - When selecting smaller pixel size of matrix (128×128), more image details are displayed than in case of the (64×64) matrix. - Longer duration time of the frames sets a limit on the accuracy of the data and on image resolutions, but in case of short duration time accurate and good image quality are obtained. - At low energy window of the spectrometer, the resolution of the image was improved on the account of its contrast-distortion. In brief, we can summaries the best physical parameters to be used in imaging with the present gamma-camera as follows: - 128 x 128 matrix size is better than 64x64. - Longer duration time of frame cause no distortion of the image. - The best energy-window resolution is 20%. - There is no effect on Differential Renal Functions on changing backgrounds and time intervals.