A voxel phantom based Monte Carlo computer program for optimisation of chest and lumbar spine X ray imaging systems
2000 (English)In: Radiation Protection Dosimetry, ISSN 0144-8420, Vol. 90, no 1-2, 105-108 p.Article in journal (Refereed) Published
A Monte Carlo computer model of X ray imaging systems has been developed which uses a voxel phantom to simulate the patient. Image details were selected in accordance with the European quality criteria document. Contrast and signal-to-noise ratio for these details were calculated to estimate image quality. Effective dose was computed to enable optimisation. The program was validated with measurements on phantoms, patients and digitised patient images. It was demonstrated that the computational model of the imaging system provides predictions of entrance dose and contrast that lie within the range of values measured on patients. To illustrate the importance of using a realistic model of the patient, scatter-to-primary ratios, S/P, in a chest PA examination were calculated. It was found that the S/P varied by a factor of 10 in the image and that a grid was slightly more efficient than an air gap in removing the scatter behind the heart.
Place, publisher, year, edition, pages
2000. Vol. 90, no 1-2, 105-108 p.
Medical and Health Sciences
IdentifiersURN: urn:nbn:se:liu:diva-26769Local ID: 11371OAI: oai:DiVA.org:liu-26769DiVA: diva2:247319