ASSESSING THE USEFULNESS OF THE QUASI-IDEAL OBSERVER FOR QUALITY CONTROL IN FLUOROSCOPY.
The aim of this work was to evaluate the reliability of the square of the signal-to-noise ratio rate, [Formula: see text], as a precise measurement for quality control test in a digital fluoroscopy system. The quasi-ideal model observer was used to measure [Formula: see text] The dose rate, pulse rate and field of view were varied, and their effect on dose efficiency, defined as [Formula: see text], was evaluated (where [Formula: see text] is the air kerma-area product rate). Measurements were repeated to assess reproducibility. The relative standard deviation in [Formula: see text] over seven consecutive measurements was 5 %. No significant variation in [Formula: see text] was observed across different pulse rates (10-30 pulses s(-1)). The low-dose-rate setting had a superior dose efficiency compared with the medium- and high-dose-rate settings. A smaller field of view resulted in higher dose efficiency.The results show that [Formula: see text] measurements offer the high precision required in quality control constancy tests.
Medical Radiation Physics, Department of Medical and Health Sciences and Center for Medical Image Science and Visualisation, Linköping University, SE-58185 Linköping, Sweden erik.tesselaar@liu.se.
E
E
Tesselaar
Medical Radiation Physics, Department of Medical and Health Sciences and Center for Medical Image Science and Visualisation, Linköping University, SE-58185 Linköping, Sweden.
M
M
Sandborg
D000465:Algorithms; D004867:Equipment Design; D019544:Equipment Failure Analysis; D005471:Fluoroscopy / Q000295:instrumentation* / Q000592:standards*; D011785:Quality Assurance, Health Care / Q000379:methods / Q000592:standards*; D011786:Quality Control; D011857:Radiographic Image Interpretation, Computer-Assisted / Q000295:instrumentation / Q000592:standards*; D015203:Reproducibility of Results; D012680:Sensitivity and Specificity; D059629:Signal-To-Noise Ratio; D013548:Sweden