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Centre of rotation stability setting for the INFINIA camera
BAKI, Marcel
My bachelor thesis focus on Centre of rotation stability for Infinia cameraAt my work I got closely familiarize with scintillation camera Infinia Hawkeye, which is located in the department of nuclear medicine in the České Budějovice. The aim of my work was to determine whether the centre of rotation (C.O.R.) takes place around a fixed axis, and thus whether there is not movement. The method that I chose to accomplish my goals, was to test the camera , which was performing by 360° acquisition around a point source 99mTc. The point source was fitted to a rod and placed on the Infinia camera on patient's pallet. Testing was carried out with two collimators LEHR and LEGP in modes H and L. The testing was performed by radiological physicist, always in the afternoon to ensure smooth running of the workplace. The test confirmed my hypothesis that the value will be within the values specified by the manufacturer. Testing was performed once a month for half a year. In In this days because we are apperceiving tremendous technological progress, and devices which allow us to produce more perfectly and detailed images and contribute to better diagnosis and treatment are created it is very important to ensure the quality control. Over the last few years progress in gamma camera designs , have improved all aspects of image quality, particularly in tomographic images. As the system complexity increases, it becomes more important that all nuclear medicine employees are able to recognize the various types of aberrations or artefacts that can occur in nuclear medicine imaging systems. The primary purpose of the quality control program in department for nuclear medicine is to verify that the images accurately reflect distribution of the radiopharmaceutical within the patient. The purpose of quality control is detect changes of gamma camera system that may adversely affect the interpretation of clinical studies. There are large number of factors that contribute to the final quality of the image ( including uniformity, resolution - both intrinsic and energy, pulse frequency, centre of rotation system, rotational stability of the detector head). On a everyday examinations there is a limited amount of time that can be reasonably devoted to quality control system. Hence the main goal of quality control program should be to monitor those parameters that are most sensitive to changes in system performance and are most likely to impact clinical studies. Therefore , the main objective of quality control program should be monitor the parameters that are most sensitive to changes in system performance and most likely have a impact on the clinical studies. Specials series of quality control tests were designed to ensure the optimal performance of the camera. Over the whole time of the entire period of clinical operation, technicians or physicists regularly perform various quality control tests, some daily, others weekly or monthly. The purpose of these tests is monitor day to day camera performance and detect changes from the baselines values. Additional quality control test may be performed to compare characteristics of different systems and to optimize the quality of clinical studies.
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