1. A method of identifying a region of interest in medical imaging data of a subject, comprising the steps of: generating an intensity projection image from the medical imaging data; in a processor, processing the medical imaging data to find one or more maxima in the medical imaging data; in said processor, comparing the found one or more maxima with the intensity projection image; and in said processor, identifying one of the maxima which is not represented in the intensity projection image, and making an indication of said one of said maxima available in electronic form at an output of said processor.