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SU-E-I-101: Initial Implementation and Evaluation of AAPM TG-150 Draft Image Receptor Non-Uniformity Testing
J Dave1,2,3,4,5,6, E Gingold1,2,3,4,5,6, J Yorkston1,2,3,4,5,6
1Thomas Jefferson UniversityHospital, Philadelphia, PA.
Medical Physics
|May 19, 2017
Summary
Software implementing AAPM TG150 recommendations effectively tests digital x-ray image receptor performance. Noise non-uniformity proved a sensitive indicator for detector calibration and structured noise evaluation.
Area of Science:
- Medical Physics
- Radiological Imaging
- Quality Assurance
Background:
- Digital radiographic systems require robust performance testing.
- AAPM Task Group 150 (TG150) provides draft recommendations for image receptor evaluation.
- Standardized software implementation is needed for consistent testing.
Purpose of the Study:
- To develop software for AAPM TG150's image receptor performance testing procedures.
- To assess the effectiveness and practicality of these TG150 testing methods.
Main Methods:
- Digital x-ray image receptors were tested across six institutions.
- Flat field images were acquired at varying air kerma levels.
- Software processed images to calculate signal, noise, SNR, and non-uniformity metrics (local and global).
Main Results:
- The TG150 tests successfully differentiated detector performance.
- Noise non-uniformity was more sensitive than signal or SNR non-uniformity for detecting calibration issues.
- Detector rotation significantly impacted signal non-uniformity.
Conclusions:
- The software implementation of AAPM TG150 recommendations is effective.
- The proposed testing approach is practical for routine digital radiographic quality assurance.
Keywords:
CalibrationDigital radiographyImage sensorsQuality assuranceRadiographyRotation measurementTesting procedures
