| Author(s) | S.H.A. Al-Lehyani |
| Affiliation | Physics Department, (Medical Physics Group), Faculty of Applied Sciences, Um Al-Qura University, Makkah, Saudi Arabia P .O. Box 10130 Tel:+966-2-5667624, Email address: saud8882001@yahoo.com |
| Title | Effect of Peak Shift on Planer and SPECT Images |
| Source | Journal of King Saud University. Science. Volume 19, No 1. (2007/1427) |
| Abstract | Gamma cameras are used to detect the radiopharmaceutical distributions in the patients organs. In the present work, investigation of the radiopharmaceutical distribution was carried out in one or more sections of some organs using the single photon emission computed tomography technique (SPECT) in which the gamma-camera detects the distribution of the injected radiopharmaceutical from varying angles around the patient's body at fixed intervals. To avoid interpretation mistakes, which can be generated due to protocol errors, the gamma camera must work at optimum conditions. One of these errors is the camera non-uniformity. This work aims to define the uniformity of the gamma camera which depends on many parameters such as the peak shift (off-peak) which is the shift of a specified radio isotope peak from its real position. In SPECT studies, the effect of the off-peak shift using heart phantoms, appears very important. Changes in the off-peak will affect the quality of the images very much leading to a different clinical diagnosis. It is concluded that the optimum off-peak is the 0% shift, but the data acquired in practice within the range of 0 to 2% off-peak shift does not affect the image quality considerably. Keywords: Radionuclide imaging; SPECT; Physical factor. |
