Optimisation of X-Ray CT within SPECT/CT Studies

Thesis

Jambi, L.K . 2013

• نوع عمل المنشور: رسالة الماجستير

مستخلص المنشور

This dissertation introduces methods to optimise the X-ray CT exposures within SPECT/CT studies. In this project I correlate between the body mass index BMI and the CT dose exposed to patients. In this project SPECT/CT lumbar spine for facet joint had been chosen specifically. The experimental part was divided into two phases: phase l and phase ll. In phase l the phantom had been prepared and 12 different acquisitions had been acquired for both SPECT and CT with different CT parameters each time. In phase ll radioactive materialTc-99m had been administered into the facet joint. Also a source in a syringe inserted alongside the lumbar spine. Then 3 different acquisitions had been acquired for both SPECT and CT as well. A nuclear medicine radiologist evaluated the 15 acquired images qualitatively for localisation quality purposes. Assessment of the images concluded with determining the best and the worst images acquired. The best image acquired is the one with high kVp 130 and high mAs 60. In contrast, the worst image is the one acquired with low kVp 80 and low mAs 20. Then the images are evaluated according to the CT noise level in the image by measuring the SD, the larger the SD which is the one with 130 kVp 20 mAs the higher the image noise. Finally, this paper concludes with that all the findings are appropriate with the large patients since the phantom size best corresponds to larger patients.