Hale GR, et al. - Researchers sought to compare the registration error (RE) between rigid and elastic registration during magnetic resonance imaging (MRI)/ultrasound (US) fusion guided prostate biopsy (FBx) using a prostate phantom model. They placed 4 gold fiducial markers visible on MRI and US throughout one phantom prostate model. RE between rigid or elastic registration was not different overall. However, rigid registration was noted to reduce the RE for targets near the prostate edge. Regardless of registration method, operator experience reduces RE additionally. Thereby suggesting that when beginning the procedure and before targeting each region of interest, the use of elastic registration algorithms cannot act as a replacement for attention to detail during the registration process and use of anatomical landmarks indicating accurate registration.