Alderson ANGIOGRAPHIC HEAD PHANTOMS bridge the gap between physical and anatomical information requirements. Molded in tissue-equivalent material, an accurate male skull contains a 3-dimensional, high-contrast vascular simulation to facilitate correlation of the radiologist's subjective evaluation of angiographic image quality with actual measurements of resolution and contrast under the same exposure conditions. Each ANGIOGRAPHIC HEAD PHANTOM contains a 5-step wedge. A 2-10 line pair/mm test pattern is optional. Other patterns or test objects and custom pathologies are available on special order. The ANGIOGRAPHIC HEAD PHANTOM provides a "dry run" to completely check out angiographic equipment and ensure that it is operating satisfactorily in all significant details before subjecting patients to radiological procedures. If the imaging system malfunctions, the phantom also plays a critically important role in isolating and verifying correction of the problems. The ANGIOGRAPHIC HEAD PHANTON confines the variables to components and technique and is an invaluable service and teaching tool