TABLE 2.
Summary of the linear attenuation coefficient (LAC: μ) for multiple tissue substitutes39
| Lung | Water | Griffith‐Bone |
Threshold in this study |
||||||
|---|---|---|---|---|---|---|---|---|---|
| Modality |
Tube voltage (kV) |
E eff (keV) |
μ (cm‐1) |
μ scat (cm‐1) |
μ (cm‐1) |
μ scat (cm‐1) |
μ (cm‐1) |
μ scat (cm‐1) |
μ 200 (cm‐1) |
| XF | 50 | 28 | 0.114 | 0.065 | 0.399 | 0.235 | 1.150 | 0.304 | 0.642 |
| XF | 70 | 31 | 0.098 | 0.063 | 0.345 | 0.227 | 0.915 | 0.293 | 0.529 |
| XF | 90 | 34 | 0.088 | 0.062 | 0.309 | 0.222 | 0.753 | 0.283 | 0.453 |
| CT | 120 | 56 | 0.059 | 0.052 | 0.212 | 0.196 | 0.343 | 0.244 | 0.254 |
| Calculated CT value (HU) | −722 | 0 | 618 | 200 | |||||
Note: Lung, Water and Griffith‐Bone are tissue substitutes.39
Abbreviations: CT, computer tomography; E eff, effective energy; HU, Hounsfield unit; μ scat, scatter contribution of LAC; μ 200, LAC threshold to separate contribution of soft tissue from that of bone; XF, X‐ray fluoroscopy.