Single-acquisition method for simultaneous determination of extrinsic gamma-camera sensitivity and spatial resolution.
A new method for measuring simultaneously both the extrinsic sensitivity and spatial resolution of a gamma-camera in a single planar acquisition was implemented. A dual-purpose phantom (SR phantom; sensitivity/resolution) was developed, tested and the results compared with other conventional methods used for separate determination of these two important image quality parameters. The SR phantom yielded reproducible and accurate results, allowing an immediate visual inspection of the spatial resolution as well as the quantitative determination of the contrast for six different spatial frequencies. It also proved to be useful in the estimation of the modulation transfer function (MTF) of the image formation collimator/detector system at six different frequencies and can be used to estimate the spatial resolution as function of the direction relative to the digital matrix of the detector.
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Serviço de Física Médica, Instituto Português de Oncologia Francisco Gentil do Porto, E.P.E., Rua Dr. António Bernardino de Almeida, 4200-072 Porto, Portugal. a.miranda@portugalmail.pt
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D015902:Gamma Cameras / Q000706:statistics & numerical data*; D006801:Humans; D019047:Phantoms, Imaging; D011853:Radiobiology; D011877:Radionuclide Imaging / Q000706:statistics & numerical data*; D012680:Sensitivity and Specificity