A<unk>  (pronounced "JAY-zak") aka Data Spectrum ECT phantom is an imaging phantom used for validating scanner geometry, 3D contrast, uniformity, resolution, attenuation and scatter correction or alignment tasks in nuclear medicine. It is commonly used in academic centers and hospitals to characterize a SPECT or some gamma camera systems for quality control purposes. It is used for accreditation by clinical and academic facilities for the American College of Radiology. The phantom was developed by Ronald J.<unk>  of Duke University, and was filed for a patent in 1982. It is a cylinder containing fillable inserts that is often used with a radionuclide such as Technetium-99m or Fluorine-18. Although the phantom can be used for acceptance testing, the National Electrical Manufacturers Association recommends a 30 million count acquisition and section reconstruction of the phantom be performed quarterly. In 1981 Ronald J.<unk>  founded Data Spectrum Corporation which manufactures the<unk>  and several other nuclear imaging tools, such as the Hoffman Brain phantom.
Jaszczak phantom
Shepp–Logan phantom
Darrow Yannet diagram
Welner table
Challacombe scale
Lund and Browder chart
Jaeger chart
Mentzer index