T2w-MRI plays an important role in prostate cancer providing information on the location and aggressiveness in diagnosis and therapy. T2-mapping may provide objective characterization, but is hampered by long acquisition time, which has been addressed by dedicated acceleration techniques (e.g. k-t T2-mapping). We investigated T2-mapping in a prostate cancer patient based on a 4-minute protocol with Poisson-disk prospective irregular sub-sampling in the ky-TE domain in combination with a low rank and sparsity constraint compressed sensing reconstruction. The regularization parameters were investigated, and compressed sensing results were compared to separately acquired k-t T2-maps with respect to quality and noise.