Standardization of Multiparametric Prostate MR Imaging Using PI-RADS

Table 3

PI-RADS scoring system for DWI.

PI-RADS score	Criteria
1	No reduction in ADC compared to normal glandular tissue. No increase in signal intensity on any high 𝑏-value images*
2	Diffuse hypersignal intensity on high 𝑏-value images* with low ADC; no focal features, linear, triangular, or geographical features, allowed
3	Intermediate appearances not in categories 1/2 or 4/5
4	Focal area(s) of reduced ADC but isointense signal intensity on high 𝑏-value images*
5	Focal area/mass of hypersignal intensity on the high 𝑏-value images* with reduced ADC

∗(≥b800).