The ultrasound operator will perform doppler ultrasound assessment of graft parenchymal perfusion, and mark on the skin positions of the transplant upper, inter and lower poles. The ultrasound assessment will include a measurement of the distance from skin to the corticomedullary junction of the upper, inter and lower poles of the kidney transplant. NIRS data will then be recorded for 2 minutes with two NIRS sensors placed over the transplant mid and lower poles as per markings from ultrasound.