| Popis: |
Visual field uniformity of DST-XL scintillation camera is assessed on daily basis during quality controls of instrumentation at the Department of Nuclear Medicine at Hospital in České Budějovice. Uniformity is a critical quality parameter in scintigraphic imaging. It indicates whether all points in visual field are displayed with equal efficiency (sensitivity). Also, it allows specialists to obtain quality images of how radiopharmaceuticals are distributed in a patient?s body. The objective of my bachelor?s thesis is to verify whether the measured values fall within the range set by the manufacturer. Assessments were carried out on a bi-weekly basis for the duration of six months between start of October 2010 and end of March 2011. The measurement method used at the Department of Nuclear Medicine at Hospital in České Budějovice employs homogeneous irradiation of the detector without collimator produced by a point source which allows assessment of intrinsic uniformity of the detector. Also, there is another method that determines total (extrinsic) uniformity of the camera. This method utilizes an area source to produce homogeneous irradiation of the detector. The important difference between the two methods is that the latter uses collimator, unlike the method used for the purposes of this thesis. Yet, both methods produce roughly the same outcomes. The results obtained from the tests of stability of DST-XL scintillation camera?s visual field uniformity fall within the range of values permitted by the manufacturer and confirm my hypothesis. |
