Table 3.

Computed calibration values for the body size and radiation dose conditions investigated in this study.

Phantom size	Slope,	Intercept,	Slope,	Intercept,	CT# bone,	CT# bone,	CT# red marrow,	CT# red marrow,	CT# fat,	CT# fat,
and dose level	80 kVp	80 kVp	140 kVp	140 kVp	80 kVp	140 kVp	80 kVp	140 kVp	80 kVp	140 kVp
Internal calibration
Small
1×	0.95	125.32	0.63	109.35	1958.0	1310.5	124.7	109.5	−112.2	−88.3
2×	0.95	124.24	0.63	109.35	1957.4	1311.8	123.6	109.8	−112.6	−87.6
4×	0.96	124.84	0.63	109.52	1962.6	1312.5	124.5	109.9	−112.0	−87.2
Medium
1×	0.93	127.02	0.61	109.46	1907.8	1283.2	127.0	109.9	−107.6	−85.8
2×	0.93	124.94	0.61	109.53	1917.5	1278.1	124.9	109.5	−109.3	−86.1
4×	0.94	125.62	0.61	109.22	1926.4	1284.5	125.5	109.2	−109.9	−86.1
Large
1×	0.88	116.37	0.59	107.58	1805.7	1235.2	117.0	107.1	−106.9	−84.9
2×	0.89	120.47	0.59	106.38	1831.4	1245.1	120.6	106.6	−109.2	−85.6
4×	0.90	120.51	0.59	106.92	1857.1	1241.8	120.8	107.0	−109.2	−85.8
External calibration
Small, 4×	0.99	110.3	0.65	105.7	2013.9	1354.9	109.7	105.5	−131.3	−97.2
Medium, 4×	0.96	110.0	0.63	104.5	1954.7	1321.7	111.4	106.0	−132.3	−97.0
Large, 4×	0.94	108.7	0.62	101.4	1917.5	1293.5	108.0	102.1	−128.8	−97.0