In this of Horse International we are going to explain how advanced imaging techniques, like MRI and scintigraphy, work Scintigraphy Equine scintigraphy (bone scan) involves injection of a radioisotope, (technetium-99m) which is linked to a compound called bisphosphonate-MDP. Within a couple of hours this combined compound shows up in areas of the horse’s skeleton where there is increased activity of the bone, which may indicate lesions.