A Computerized Tomography Phantom: Design and Construction

摘要

A phantom for performance evaluation and quality assurance of CT scanners was designed and built in agreement with quality control requirements established by the Mexican Regulations (NOM-158-SSA1-1996). Phantom materials were chosen after experimental determination of their Hounsfield units. The phantom allows to perform the following tests: calibration, constancy and uniformity of the CT number, CT number dependence on the reconstruction algorithm, high and low contrast resolution, slice thickness and coincidence of the slice with the light system for patient alignment. We present and discuss the results of these test applied to two CT scanners.