X-Ray Computed Tomography Standards
Abstract
The use of test standards, or phantoms, to evaluate the performance of a computed tomography (CT) system is critical to monitoring the system performance and ensuring the sensitivity to features of interest. Test phantoms for monitoring performance have been used in the Advanced Development of X-Ray Computed Tomography Applications program to establish quantitative measures for the inherent image quality and measurement capability of the CT systems used. The phantoms allow the determination of resolution and contrast sensitivity of the CT system for each set of scan parameters. In addition to image quality phantoms, material/density calibration phantoms and positional registration phantoms are discussed. This task assignment on standards has determined that simple phantoms can be effectively used for relative measurements of inherent image quality. The use of the modulation transfer function (MTF) and contrast discrimination curves calculated from scans of image quality phantoms can be used to successfully characterize system performance. When CT evaluations are to be performed on a specific component type, a phantom that enables measurement of the specific characteristics desired in the inspection should be used. Standards, Phantoms, Resolution, Contrast sensitivity, Modulation transfer function, Dimensional accuracy
Document Details
- Document Type
- Technical Report
- Publication Date
- Feb 01, 1994
- Accession Number
- ADA286276
Entities
People
- James M. Nelson
- Richard H. Bossi
Organizations
- Air Force Research Laboratory