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

Christopher P. Favazza, Kenneth A. Fetterly, Nicholas J. Hangiandreou, Shuai Leng, Beth A. Schueler

Research output: Contribution to journalArticle

9 Citations (Scopus)

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.

Original languageEnglish (US)
Article number015503
JournalJournal of Medical Imaging
Volume2
Issue number1
DOIs
StatePublished - Jan 1 2015

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Angiography
Signal-To-Noise Ratio
Image quality
X-Rays
X rays
Signal to noise ratio
Imaging systems
Diagnostic Imaging
Uncertainty
Noise
Signal detection
Optical transfer function
Medical imaging
Power spectrum
Quantum efficiency
Equipment and Supplies
Detectors
Imaging techniques
Experiments

Keywords

  • angiography
  • detection
  • image quality
  • observer model

ASJC Scopus subject areas

  • Bioengineering
  • Radiology Nuclear Medicine and imaging

Cite this

Implementation of a channelized Hotelling observer model to assess image quality of X-ray angiography systems. / Favazza, Christopher P.; Fetterly, Kenneth A.; Hangiandreou, Nicholas J.; Leng, Shuai; Schueler, Beth A.

In: Journal of Medical Imaging, Vol. 2, No. 1, 015503, 01.01.2015.

Research output: Contribution to journalArticle

Favazza, Christopher P. ; Fetterly, Kenneth A. ; Hangiandreou, Nicholas J. ; Leng, Shuai ; Schueler, Beth A. / Implementation of a channelized Hotelling observer model to assess image quality of X-ray angiography systems. In: Journal of Medical Imaging. 2015 ; Vol. 2, No. 1.
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