When using the standard transperineal template, the template is calibrated to the ultrasound probe prior to the implant procedure by using a phantom, such that the grid on the template accurately correlates to the grid as seen on ultrasound. However, during the actual procedure it is not uncommon for the needle position as visualized on ultrasound to be slightly displaced from the predicted location. This is due to needle bending from tissue forces during insertion. When this occurs the physician removes the needle and repeats the insertion with mild force on the needle at the point of tissue entry in order to achieve the desired position. The needle guide may also be recalibrated if successive needle attempts show consistent deviation in one direction, which is indicative of slight errors in calibration. This is not an unusual finding in typical practice.