Diagnostic imaging is a medical procedure used to create images of the body to help diagnose and treat medical conditions. The term 'diagnostic image' can refer to a variety of imaging techniques, such as X-rays, CT scans, MRIs, and ultrasounds. The crossword solution for this term is 'SCAN, ' which is an acronym for 'Single Photon Emission Computed Tomography.' This type of imaging uses a single photon source to create a three-dimensional image of the body, allowing doctors to better diagnose and treat medical conditions.