Feasibility study of computed vs measured high b-value (1400 s/mm²) diffusion-weighted MR images of the prostate

Table 1 Comparison of C-b1400 and M-b1400 images; image qualitiy, quality of lesion demarcation and level of confidence were rated according to a 5-point Likert-type scale

b = 1400 s/mm2	Image quality	Lesion demarcation	Diagnostic confidence
	(n = 30)	(n = 24)	(n = 30)
M-b1400	3.1 ± 1.0	2.8 ± 0.9	2.2 ± 0.9
C-b1400	2.3 ± 0.8	2.6 ± 1.0	2.1 ± 0.8
P-value	< 0.001	0.29	0.48

Table 2 Objective parameters: Prostate-to-bladder and lesion-to-bladder signal intensity ratios were obtained to estimate signal-to-noise-ratio and contrast-to-noise ratio

b = 1400 s/mm2	SI prostate/bladder(n = 28)	SI lesion/bladder(n = 24)	Lesion diameter (mm) (n = 24)
M-b1400	1.9 ± 0.5	2.8 ± 0.9	16.9 ± 10.0
C-b1400	3.7 ± 1.0	5.6 ± 1.8	17.7 ± 10.0
P-value	< 0.001	< 0.001	0.22

Lesion diameters are presented in units of mm. SI: Signal intensity.