Evaluation of the effect of low tube voltage on radiation dose and image quality

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

物理学;医药卫生

Nik Din, Nik Norhasrina^1 ; Zainon, Rafidah^2 ; Rahman, A.T Abdul^1,2,3,4

School of Physics and Material Studies, Faculty of Applied Sciences, Universiti Teknologi MARA, Selangor, Shah Alam

40450, Malaysia^1

Radiotherapy and Oncology Department, Advanced Medical and Dental Institute, Universiti Sains Malaysia, Bertam Penang

13200, Malaysia^2

Institute of Science, Universiti Teknologi MARA, Selangor, Shah Alam

40450, Malaysia^3

Centre for Nuclear and Radiation Physics, Department of Physics, University of Surrey, Guildford

GU2 7XH, United Kingdom^4

关键词: CT imaging;    Dual-energy CT;    Photon flux;    Radiation Exposure;    Slice thickness;    SNR values;    Tube currents;    Tube voltages;   

Others  :  https://iopscience.iop.org/article/10.1088/1742-6596/851/1/012007/pdf
DOI  :  10.1088/1742-6596/851/1/012007

学科分类：卫生学

来源: IOP

【 摘 要 】

Number of Computed Tomography (CT) examinations performed worldwide is increasing. In 2010, the FDA issued an initiative to reduce unnecessary radiation exposure from CT imaging. The aim of this study is to evaluate the effect of low tube voltage on radiation dose and image quality using CTDI phantom. The CTDI phantom was scanned with dual energy CT at 80 kV and 120 kV with the tube current from 150 mAs to 350 mAs. Pitch was 1.0 while slice thickness was 1 mm and 5 mm. Results show if mAs was increased, the SNR values also will be increased. The 5 mm slice thickness shows higher SNR value compared to 1 mm slice thickness. As the voltage and tube current increased, the amount of dose absorbed is also increased because current is proportional to photon flux.