A method for objective evaluation of functional images

S. L. Bacharach, M. V. Green, R. O. Bonow, C. N. deGraaf, G. S. Johnston

Research output: Contribution to journalArticlepeer-review

26 Scopus citations


A method is described for characterizing functional maps by means of a frequency distribution function (DF) of pixels. The method makes use of a map of the standard deviation of the functional parameter. By use of this map the method (a) becomes less sensitive to imprecise definition of the organ borders, (b) compensates for random fluctuations in the functional map, and (most importantly) (c) permits spatial information to be included in the DF. This spatial information is included by perforating spatial cluster weighting - a procedure that emphasizes regional dysfunction over global dysfunction. The method is illustrated by applying it to phase maps of the left ventricle. In this example, it is shown that analysis of the DF permits detection of regional abnormalities of LV wall motion and that an improvement in detectability is obtained with cluster weighting.

Original languageEnglish (US)
Pages (from-to)285-290
Number of pages6
JournalJournal of Nuclear Medicine
Issue number4
StatePublished - Jul 2 1982

ASJC Scopus subject areas

  • Radiological and Ultrasound Technology


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