Dose and slice thickness evaluation with nMAG gel dosimeters in computed tomography

被引:7
|
作者
Chuang, Chun-Chao [1 ,2 ]
Wu, Jay [3 ]
机构
[1] Chung Shan Med Univ, Dept Med Imaging & Radiol Sci, Taichung, Taiwan
[2] Chung Shan Med Univ Hosp, Dept Med Image, Taichung, Taiwan
[3] Natl Yang Ming Univ, Dept Biomed Imaging & Radiol Sci, Taipei, Taiwan
来源
SCIENTIFIC REPORTS | 2018年 / 8卷
关键词
CONE-BEAM CT; EXPOSURE; DETECTOR;
D O I
10.1038/s41598-018-21022-8
中图分类号
O [数理科学和化学]; P [天文学、地球科学]; Q [生物科学]; N [自然科学总论];
学科分类号
07 ; 0710 ; 09 ;
摘要
Computed tomography (CT) has been widely used in clinical diagnosis. It is important to estimate radiation dose and perform image quality assurance procedures for CT scans. In this study, nMAG gel dosimeters were used to simultaneously measure the 300-mm weighted CT dose index (CTDI) and slice sensitivity profile (SSP) for multiple detector CT (MDCT). Magnetic resonance imaging (MRI) was performed on the irradiated gel to create R-2-dose response curves for the tube voltages of 120 and 140 kVp. The gel dosimeters were loaded in three home-made cylindrical phantoms to obtain CTDI100 and CTDI300. The full width at half maximum (FWHM) for 2, 5, 10, 14.4, and 38.4-mm slice thicknesses was measured and compared with the result obtained by radiochromic films. The difference in weighted CTDI100 obtained by the gel dosimeter and ionization chamber was less than 1%. The CTDI efficiency at 120 and 140 kVp was in the range of 80.1%-82.5%. The FWHM of SSP measured by the gel dosimeter matched very well with the nominal slice thickness. The use of nMAG gel dosimeters combined with the home-made cylindrical phantoms can provide 300-mm weighted CTDI and slice thickness information, showing potential for quality assurance and clinical applications in MDCT.
引用
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页数:7
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