👉 In medical imaging, a term used to describe an image that appears opaque and black in contrast to other colors. This term is often used when discussing radiation therapy or X-rays for cancer treatment. For example, if you are seeing an image of a tumor with no visible blood vessels or tissue, the image may appear white or gray because it is being treated with a type of radiation called "thermoluminescence". In this case, the term "roentgenopaque" refers to the absence
