Optimizing Prostate MRI Protocols: New Study Supports the Shift to Biparametric MRI

Recent research spearheaded by Dalhousie University suggests that adopting a biparametric MRI (bp-MRI) protocol could improve the efficiency of prostate cancer assessment while maintaining diagnostic accuracy. This transition from the traditional multiparametric MRI (mp-MRI) to bp-MRI eliminates the default use of intravenous (IV) gadolinium contrast, which is only crucial for upgrading certain prostate lesions when dynamic enhancement is present.

John-David Brown, MD, from the Department of Diagnostic Radiology at Dalhousie University, highlighted the institutional shift to bp-MRI at their center. "Our primary aim was to enhance accessibility and efficiency while preserving the accuracy of PI-RADS categorization," Dr. Brown explained, referencing findings from a recent study by Rehman et al. that strongly support this approach.

The study conducted by Dr. Brown and his colleagues focused on prostate bp-MRI exams performed after implementing the new protocol. The research team retrospectively examined 547 exams out of 554, revealing that only 36 patients (6.6%) required a recall for IV contrast. Notably, 91.7% of these recalls were for PI-RADS 3 lesion reassessment, with nearly half (48.5%) upgraded to PI-RADS 4 following enhanced analysis. These results underscore the practicality of selective contrast recall, which enables clarification of ambiguous lesions without altering the overall risk profile.

The second phase of the study involved comparing prostate MRI exams conducted before and after the protocol change. With 225 exams conducted in each phase, the results showed no significant difference in PI-RADS stratification. This consistency indicates that bp-MRI effectively streamlines the process without compromising the evaluation's diagnostic integrity.

Dr. Brown emphasized that the need for IV contrast is limited. "In this study, we spared 93.4% of patients from unnecessary contrast exposure," he noted. The findings bolster existing literature advocating for bp-MRI over mp-MRI due to similar diagnostic performance and improved operational efficiency.

The researchers encourage similar protocol changes in other institutions, highlighting the benefits of reduced contrast exposure and shorter appointment durations. “Transitioning to bp-MRI aligns with patient-centered care principles, enhancing accessibility without sacrificing diagnostic standards,” Dr. Brown asserted.

The full study, "Implementation of a biparametric prostate MRI protocol with a recall system for intravenous contrast: an analysis of recall rates and comparison of PI-RADS category distribution," offers insights for health care providers seeking to optimize prostate cancer imaging pathways.