Table 3.

Dose differences between CT-based dose calculation and MRI bulk density assigned dose calculation

	Plan Max Dose		D99 for Prostate		D95 for Prostate
	MRI (Gy)	CT (Gy)	MRI (Gy)	CT (Gy)	MRI (Gy)	CT (Gy)
Patient 1	76.61	76.97	72.45	73.70	72.65	73.90
Patient 2	82.43	79.58	77.58	76.05	77.82	76.30
Patient 3	76.17	74.01	70.24	69.78	70.60	70.18
Patient 4	74.81	75.17	70.83	69.10	71.15	70.89
Patient 5	74.25	75.13	70.54	72.01	70.73	72.09
Patient 6	78.02	77.05	73.80	73.76	73.94	73.92
Patient 7	78.78	77.46	73.67	73.42	73.81	73.55
Patient 9	81.59	79.62	76.77	75.77	76.98	75.95
Patient 10	74.97	75.25	70.63	72.03	70.70	72.13
Avg Dose Diff.	−1.01%		−0.11%		0.12%
STDEV	1.69%		−0.34%		−0.09%
P value	0.104		0.816		0.873