Quantification of gamma camera spatial resolution by means of bar phantom images

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dc.contributor.authorWasserman H.J.
dc.date.accessioned2011-05-15T16:17:31Z
dc.date.available2011-05-15T16:17:31Z
dc.date.issued1998
dc.description.abstractA method that has previously been described for rapid objective measurement of intrinsic gamma camera spatial resolution using statistical moments has been applied to images of a four-quadrant bar phantom acquired with various collimators. The full-width at half-maximum (FWHM) of the line spread function (LSF) and modulation transfer functions determined by the moments method was compared with those obtained directly from line spread functions. It was found that, for highest accuracy, the formulae originally described for intrinsic measurements have to be modified to take account of a more accurate description of the Fourier components of the input from a bar phantom. When this modification was applied, FWHM measurements agreed to within 4.0% with the LSF measurements in the range 4.5-7.2 mm if well- resolved images of bars wider than 3.0 mm were used. The method is simple to apply and since the coefficient of variation of these measurements was <2.2%, it is well-suited for rapid objective routine monitoring of gamma camera spatial resolution. For modulation transfer functions >0.2, bar sizes of 4.0 and 4.5 mm gave values within 4% of the LSF measurements, when the modified formula was applied, with coefficients of variation less than 4%.
dc.description.versionArticle
dc.identifier.citationNuclear Medicine Communications
dc.identifier.citation19
dc.identifier.citation11
dc.identifier.issn01433636
dc.identifier.urihttp://hdl.handle.net/10019.1/14254
dc.subjectarticle
dc.subjectcollimator
dc.subjectimage processing
dc.subjectmeasurement
dc.subjectphantom
dc.subjectquality control
dc.subjectscintillation camera
dc.subjectFourier Analysis
dc.subjectGamma Cameras
dc.subjectMathematics
dc.subjectPhantoms, Imaging
dc.titleQuantification of gamma camera spatial resolution by means of bar phantom images
dc.typeArticle
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