Quantitative criteria for assessment of gamma-ray imager performance

Steve Gottesman; Kristi Keller; Hans Malik

doi:10.1117/12.2192750

27 August 2015 Quantitative criteria for assessment of gamma-ray imager performance

Steve Gottesman, Kristi Keller, Hans Malik

Proceedings Volume 9595, Radiation Detectors: Systems and Applications XVI; 95950A (2015) https://doi.org/10.1117/12.2192750
Event: SPIE Optical Engineering + Applications, 2015, San Diego, California, United States

Abstract

In recent years gamma ray imagers such as the GammaCam^TM and Polaris have demonstrated good imaging performance in the field. Imager performance is often summarized as “resolution”, either angular, or spatial at some distance from the imager, however the definition of resolution is not always related to the ability to image an object. It is difficult to quantitatively compare imagers without a common definition of image quality. This paper examines three categories of definition: point source; line source; and area source. It discusses the details of those definitions and which ones are more relevant for different situations. Metrics such as Full Width Half Maximum (FWHM), variations on the Rayleigh criterion, and some analogous to National Imagery Interpretability Rating Scale (NIIRS) are discussed. The performance against these metrics is evaluated for a high resolution coded aperture imager modeled using Monte Carlo N-Particle (MCNP), and for a medium resolution imager measured in the lab.

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Steve Gottesman, Kristi Keller, and Hans Malik "Quantitative criteria for assessment of gamma-ray imager performance", Proc. SPIE 9595, Radiation Detectors: Systems and Applications XVI, 95950A (27 August 2015); https://doi.org/10.1117/12.2192750

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KEYWORDS

Imaging systems

Modulation transfer functions

Coded apertures

Image resolution

Point spread functions

Gamma radiation

Image processing

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