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Descriptive statistics for the radiation dose protocols.
| Setting | Tube current-time product (mAs) | CTDIvol (mGy) | DLP (mGy ・cm) | ED (mSv) | Percentage compared with NLST mean ED (%) |
|---|---|---|---|---|---|
| ultra-low | 6.3 | 0.4 | 16 | 0.2 | 14.9 |
| low | 50 | 2.8 | 112 | 1.6 | 104.5 |
| standard | 100 | 5.7 | 228 | 3.2 | 212.8 |
CTDIvol, volume CT dose index; DLP, dose-length product; ED, effective dose; NLST, National Lung Screening Trial.
Radiation dose of each CT scan was compared to the average ED of NLST, which was 1.5 mSv.
