The Low Contrast Detectability Module is a modular expansion to the ACR phantom. It enhances testing of low contrast detectability by using 3 precise contrast levels, and sizes at each contrast level ranging from 1.5 mm to 25 mm. There are multiple objects at each size and contrast (except 25 mm) for robustness vs noise and to test radial dependence. The 464 LCD module can be used with the 464 and/or 464 extension plates. This product includes a 5-year warranty.