Resumen
Prostate cancer screening has traditionally been accomplished by a blood test for prostate serum antigen (PSA) followed by biopsy. MRI is very accurate at finding cancer, but ultrasound provides real-time guidance for biopsy. Using magnetic resonance imaging (MRI) to guide the biopsy under ultrasound improves detection and, in the case that only non-aggressive cancer is found, confidence in avoiding treating cancers that are unlikely to be deadly. Different approaches can be used with many different MRI?ultrasound fusion techniques, including ?cognitive? fusion using only the practitioner?s reading of the scans, but also software fusion using mechanical or even pure software-aided matching of the information from MRI and ultrasound.