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MO‐A‐110‐02: CR/DR Image Noise ‐ Part 2
Author(s) -
Supanich M,
Flynn M
Publication year - 2011
Publication title -
medical physics
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 1.473
H-Index - 180
eISSN - 2473-4209
pISSN - 0094-2405
DOI - 10.1118/1.3612894
Subject(s) - digital radiography , noise (video) , detector , computed radiography , radiography , quality assurance , medical physics , computer science , image quality , sensitivity (control systems) , image noise , pixel , computer vision , medicine , electronic engineering , engineering , radiology , image (mathematics) , telecommunications , external quality assessment , pathology
This portion of the Education Corse in Radiography builds upon the historical perspective of image noise analysis in Radiography and the theoretical underpinnings of Noise Power Spectrum (NPS) measurements presented in the CR/DR Image Noise ‐ Part 1 portion of the session. The initial acceptance testing and continuing assessment of the performance of the detector device in a digital radiographic system is an important component of a comprehensive Quality Assurance (QA) program, and the NPS provides valuable information on noise texture and low frequency noise characteristics. We discuss here practical approaches to the measurement of the NPS in storage phosphor, indirect conversion and direct detection devices in a clinical setting including acquisition setup and beam conditions. In addition, the sensitivity of the NPS to changes in the technique used to acquire the data or varying beam conditions will be addressed. The differences between the measurement of the NPS and noise as measured by the standard deviation of the pixel values in a ROI in different detector types will also be discussed. Learning Objectives: 1. To understand the roll of measuring the NPS of a digital radiography detector in acceptance testing or routine QA To understand the methodology and challenges of measuring the NPS of a digital radiography detector in a clinical setting 2. To become familiar with the NPS measurementˈs sensitivity to the acquisition technique and beam conditions.