A test object for evaluating the performance of medical x-ray television systems has been developed. The test object consists of an array of six steel wires of varying diameters (range 0.022" to 0.005") arranged at 30 degree intervals like spokes in a wheel, sandwiched between two circular pieces of 1/8"-thick acrylic. This test object is viewed during fluoroscopy through various thicknesses of water (6"-10") to simulate small to large patients. It can be viewed while stationary or while rotating at 7.5 - 30 RPM. Standards of performance will be given.