Prenuvo and other clinics are offering low-cost whole body MRI. This can be used to detect certain medical conditions at an early stage. Diagnostic MRI, while widely considered to be one of the most valuable imaging modalities, is often used quite late because it is slow and therefore expensive. Because of this slowness, screening using MRI was impractical — diagnostic quality scans would either take 3-4 hours, be painful to go through and prohibitively expensive or clinics would cut corners and take non-diagnostic scans, leading to lower accuracy and more unnecessary follow-up.