128 slice computed tomography dose profile measurement using thermoluminescent dosimeter

10th International Seminar on Medical Physics; 1st AMDI International Oncology Symposium

物理学;医药卫生

Salehhon, N.^1 ; Hashim, S.^1,2 ; Karim, M.K.A.^1,3 ; Ang, W.C.^1 ; Musa, Y.^1 ; Bahruddin, N.A.^1

Department of Physics, Faculty of Science, Universiti Teknologi Malaysia, Skudai, Johor

81310, Malaysia^1

Centre for Sustainable Nanomaterials (CSNano), Ibnu Sina Institute for Scientific and Industrial Research (ISI-SIR), Universiti Teknologi Malaysia, UTM Skudai, Johor

81310, Malaysia^2

Department of Diagnostic Imaging, National Cancer Institute, Precint 7, Putrajaya

62250, Malaysia^3

关键词: Beam widths;    Clinical practices;    CT protocol;    CT scanners;    Dose profile;    Gaussian functions;    Single scan;    Thermoluminescent dosimeters;   

Others  :  https://iopscience.iop.org/article/10.1088/1742-6596/851/1/012002/pdf
DOI  :  10.1088/1742-6596/851/1/012002

学科分类：卫生学

来源: IOP

【 摘 要 】

The increasing use of computed tomography (CT) in clinical practice marks the needs to understand the dose descriptor and dose profile. The purposes of the current study were to determine the CT dose index free-in-air (CTDIair) in 128 slice CT scanner and to evaluate the single scan dose profile (SSDP). Thermoluminescent dosimeters (TLD-100) were used to measure the dose profile of the scanner. There were three sets of CT protocols where the tube potential (kV) setting was manipulated for each protocol while the rest of parameters were kept constant. These protocols were based from routine CT abdominal examinations for male adult abdomen. It was found that the increase of kV settings made the values of CTDIairincreased as well. When the kV setting was changed from 80 kV to 120 kV and from 120 kV to 140 kV, the CTDIairvalues were increased as much as 147.9% and 53.9% respectively. The highest kV setting (140 kV) led to the highest CTDIairvalue (13.585 mGy). The p-value of less than 0.05 indicated that the results were statistically different. The SSDP showed that when the kV settings were varied, the peak sharpness and height of Gaussian function profiles were affected. The full width at half maximum (FWHM) of dose profiles for all protocols were coincided with the nominal beam width set for the measurements. The findings of the study revealed much information on the characterization and performance of 128 slice CT scanner.