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Measured CT numbers (HU) of a 9.5 mm diameter, 50 mg/cc CaCO3 nodule when scanned in water, in a 1.8 cm diameter air cavity, and in a 4.4 cm diameter air cavity for 3 CT scanners.
| Scanner | CT no. in water | CT no. in 1.8 cm diameter air cavity | CT no. in 4.4 cm diameter air cavity |
|---|---|---|---|
| GE LightSpeed Ultra-8 | 66 | 51 | 36 |
| GE LightSpeed VCT | 64 | 37 | 19 |
| Siemens Sensation 64 | 66 | 99 | 95 |
