Table 2.
Parameters used during volume acquisition with corresponding CTDIvol and lung volumes and the results of global airway analysis. Dose reduction was calculated comparing the CTDIvol of the control protocol with the corresponding target protocol. Following airway segmentation, the number of airways was reported and pi10 was calculated. Lung volumes were determined from the final lung segmentation.
| Scan ID | Scan description | Effective mAs | CTDIvol [mGy] | % reduction | # segmented airways | pi10 | Lung volume [L] |
|---|---|---|---|---|---|---|---|
| Control variability | Control | 105 | 7.02 | – | 262 | 3.71 | 1.83 |
| SPIROMICS w TCM | 105 | 7.02 | 0% | 243 | 3.71 | 1.81 | |
| No-TCM | Control | 104 | 6.95 | – | 309 | 3.65 | 2.03 |
| SPIROMICS | 110 | 7.32 | −5% | 332 | 3.66 | 2.03 | |
| SPIROMICS | 110 | 7.32 | −5% | 334 | 3.65 | 2.03 | |
| Low-dose | Control | 104 | 6.99 | – | 303 | 3.65 | 1.99 |
| Low dose chest | 47 | 2.48 | 65% | 306 | 3.68 | 1.99 | |
| Low dose chest | 47 | 2.48 | 65% | 311 | 3.66 | 1.99 | |
| Ultra-low dose | Control | 105 | 7.02 | – | 320 | 3.68 | 2.05 |
| Ultra-low dose | 10 | 0.67 | 90% | 287 | 3.90 | 2.05 | |
| Ultra-low dose | 10 | 0.64 | 91% | 256 | 3.84 | 2.05 | |
| Tin filtered ultra-low dose | Control | 104 | 6.95 | – | 322 | 3.67 | 2.02 |
| Sn ultra-low dose | 93 | 0.32 | 95% | 261 | 3.69 | 2.02 | |
| Sn ultra-low dose | 93 | 0.32 | 95% | 249 | 3.76 | 2.02 |