MO-A-110-02: CR/DR Image Noise - Part 2

Abstract

This portion of the Education Corse in Radiography builds upon the historical perspective of imagenoise analysis in Radiography and the theoretical underpinnings of Noise Power Spectrum (NPS) measurements presented in the CR/DR ImageNoise ‐ Part 1 portion of the session. The initial acceptance testing and continuing assessment of the performance of the detector device in a digital radiographicsystem 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 radiographydetector in acceptance testing or routine QA To understand the methodology and challenges of measuring the NPS of a digital radiographydetector in a clinical setting 2. To become familiar with the NPS measurement's sensitivity to the acquisition technique and beam conditions.