Image Perception, Observer Performance, and Technology Assessment

Implementation of a channelized Hotelling observer model to assess image quality of x-ray angiography systems

[+] Author Affiliations
Christopher P. Favazza, Nicholas J. Hangiandreou, Shuai Leng, Beth A. Schueler

Mayo Clinic, Department of Radiology, 200 First Street SW, Rochester, Minnesota 55905, United States

Kenneth A. Fetterly

Mayo Clinic, Department of Radiology, 200 First Street SW, Rochester, Minnesota 55905, United States

Mayo Clinic, Department of Cardiovascular Diseases, 200 First Street SW, Rochester, Minnesota 55905, United States

J. Med. Imag. 2(1), 015503 (Mar 25, 2015). doi:10.1117/1.JMI.2.1.015503
History: Received September 23, 2014; Accepted March 10, 2015
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Abstract.  Evaluation of flat-panel angiography equipment through conventional image quality metrics is limited by the scope of standard spatial-domain image quality metric(s), such as contrast-to-noise ratio and spatial resolution, or by restricted access to appropriate data to calculate Fourier domain measurements, such as modulation transfer function, noise power spectrum, and detective quantum efficiency. Observer models have been shown capable of overcoming these limitations and are able to comprehensively evaluate medical-imaging systems. We present a spatial domain-based channelized Hotelling observer model to calculate the detectability index (DI) of our different sized disks and compare the performance of different imaging conditions and angiography systems. When appropriate, changes in DIs were compared to expectations based on the classical Rose model of signal detection to assess linearity of the model with quantum signal-to-noise ratio (SNR) theory. For these experiments, the estimated uncertainty of the DIs was less than 3%, allowing for precise comparison of imaging systems or conditions. For most experimental variables, DI changes were linear with expectations based on quantum SNR theory. DIs calculated for the smallest objects demonstrated nonlinearity with quantum SNR theory due to system blur. Two angiography systems with different detector element sizes were shown to perform similarly across the majority of the detection tasks.

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© 2015 Society of Photo-Optical Instrumentation Engineers

Citation

Christopher P. Favazza ; Kenneth A. Fetterly ; Nicholas J. Hangiandreou ; Shuai Leng and Beth A. Schueler
"Implementation of a channelized Hotelling observer model to assess image quality of x-ray angiography systems", J. Med. Imag. 2(1), 015503 (Mar 25, 2015). ; http://dx.doi.org/10.1117/1.JMI.2.1.015503


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