The Template biopsy is one where they use a grid (template). Where this happens before MRI many needles may be used so that the Prostate is covered in a uniform patten so any tumour over a predetermined size is hit. When the Template biopsy is done after MRI fewer cores may be taken and these concentrated on suspicious areas of concern, but still using the grid. This grid is used to plot where the needles take cores, a bit like a map reference. The TRUS biopsy is more random.