TABLE I.
Ring “A”: Median and standard deviation of the three materials scanned using SAFIRE at decreasing doses. *P value < 0.05—Comparing median SAFIRE value and median WFBP value at the same dose level for the same material.
| Material | SAFIRE: Ring A—median HU (sd) | |||||
|---|---|---|---|---|---|---|
| Dose (mGy) | 11.94 | 9.04 | 5.97 | 3.04 | 1.55 | 0.74 |
| Acrylic | 120 (6.57) | 120 (7.07) | 121 (7.21) | 120 (8.83) | 121 (11.21) | 120 (17.11) |
| Water | −5 (6.53) | −6 (6.82) | −5.00 (7.71) | −5 (9.43) | −6 (11.33) | −6 (15.97) |
| 20 lb foam | −702 (4.35) | −703 (4.47) | −702 (5.97) | −703 (8.37) | −703 (9.74) | −703 (14.75) |
| 12 lb foam | −824 (3.13) | −824 (3.56) | −823 (4.10) | −823 (5.92) | −823 (7.93) | −823 (11.67) |
| Lung foam | −857 (6.82) | −857 (6.97) | −856 (7.53) | −856 (8.97) | −856 (11.30) | −856 (15.43) |
| 4 lb foam | −937 (3.46) | −938 (4.23) | −938 (4.65) | −938 (6.49) | −937 (9.93) | −937 (14.32) |
| Internal air | −999 (2.97) | −999 (3.30) | −999 (4.09) | −998.0 (5.23)* | −997 (6.88)* | −994 (9.08)* |
| External air | −1002 (4.37) | −1002 (4.93) | −1002 (4.94) | −1001 (6.54)* | −1000 (8.01)* | −996 (10.77)* |