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KMID : 0880420180190061179
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Korean Journal of Radiology
2018 Volume.19 No. 6 p.1179 ~ p.1186
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Size-Specific Dose Estimation In the Korean Lung Cancer Screening Project: Does a 32-cm Diameter Phantom Represent a Standard-Sized Patient in Korean Population?
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Kim Eun-Young
Kim Tae-Jung
Goo Jin-Mo
Kim Hyae-Young
Lee Ji-Won
Lee Soo-Jung
Lim Jun-Tae
Kim Yeol
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Abstract
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Objective: The purposes of this study were to evaluate size-specific dose estimate (SSDE) of low-dose CT (LDCT) in the Korean Lung Cancer Screening (K-LUCAS) project and to determine whether CT protocols from Western countries are appropriate for lung cancer screening in Korea.
Materials and Methods: For participants (n = 256, four institutions) of K-LUCAS pilot study, volume CT dose index (CTDIvol) using a 32-cm diameter reference phantom was compared with SSDE, which was recalculated from CTDIvol using size-dependent conversion factor (f-size) based on the body size, as described in the American Association of Physicists in Medicine Report 204. This comparison was subsequently assessed by body mass index (BMI) levels (underweight/normal vs. overweight/obese), and automatic exposure control (AEC) adaptation (yes/no).
Results: Size-specific dose estimate was higher than CTDIvol (2.22 ± 0.75 mGy vs. 1.67 ± 0.60 mGy, p < 0.001), since the f-size was larger than 1.0 for all participants. The ratio of SSDE to CTDIvol was higher in lower BMI groups; 1.26, 1.37, 1.43, and 1.53 in the obese (n = 103), overweight (n = 70), normal (n = 75), and underweight (n = 4), respectively. The ratio of SSDE to CTDIvol was greater in standard-sized participants than in large-sized participants independent of AEC adaptation; with AEC, SSDE/CTDIvol in large- vs. standard-sized participants: 1.30 ± 0.08 vs. 1.44 ± 0.08 (p < 0.001) and without AEC, 1.32 ± 0.08 vs. 1.42 ± 0.06 (p < 0.001).
Conclusion: Volume CT dose index based on a reference phantom underestimates radiation exposure of LDCT in standard-sized Korean participants. The optimal radiation dose limit needs to be verified for standard-sized Korean participants.
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KEYWORD
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Low-dose CT, Radiation dose, Radiation dosage, Early detection
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