Optimisation of density and contrast yielded by multiformat photographic imagers used for scintigraphy

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dc.contributor.authorMuller C.
dc.contributor.authorWasserman H.J.
dc.contributor.authorErlank P.
dc.contributor.authorKlopper J.F.
dc.contributor.authorMorkel H.R.
dc.contributor.authorEllmann A.
dc.date.accessioned2011-05-15T16:17:44Z
dc.date.available2011-05-15T16:17:44Z
dc.date.issued1989
dc.description.abstractThe maximum optical density (MOD) and contrast (characterised by an effective gamma, gamma eff) yielded by multiformat photographic imagers used for scintigraphy, was determined by densitometry of a computer image, which consisted of a pattern of uniform squares containing known counts. A series of clinical scintigrams were photographed using various MOD and gamma eff values, and were graded by three experienced clinicians. It was found that a MOD of 1.6 and a gamma eff of 2.9 yielded optimal images for general use if bone scintigrams are also to be photographed. Lesion detectability in phantom images using extreme MOD and gamma eff values that were still clinically acceptable was determined. At very low false-positive rates (<or=1%) the higher gamma eff yielded a significantly greater lesion detectability (p=0.02) at an information density of 2200 counts cm-2 in accordance with Whitehead's theory. It is concluded that quantification and optimisation of density and contrast factors are important and that the technique described enables quality control of multiformat imagers with respect to these factors.
dc.description.versionArticle
dc.identifier.citationPhysics in Medicine and Biology
dc.identifier.citation34
dc.identifier.citation4
dc.identifier.issn00319155
dc.identifier.other10.1088/0031-9155/34/4/006
dc.identifier.urihttp://hdl.handle.net/10019.1/14347
dc.subjectimaging
dc.subjectmethodology
dc.subjectoptical density
dc.subjectpriority journal
dc.subjectscintillation camera
dc.subjectRadionuclide Imaging
dc.subjectROC Curve
dc.subjectScintillation Counting
dc.subjectSupport, Non-U.S. Gov't
dc.titleOptimisation of density and contrast yielded by multiformat photographic imagers used for scintigraphy
dc.typeArticle
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