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HU values in the aorta and trachea for routine dose and ultra-low-dose CT protocols
| Parameter | Protocol | Aorta | Trachea |
|---|---|---|---|
| Hounsfield unit (mean±SD) | Routine dose | 46±37 | -975±36 |
| Ultra-low-dose | 49±39 | -972±41 |
On average, the ROI was 55 mm2 containing 55 pixels.
