** Shares of Healius rise as much as 6.5% to A$1.715, posting their biggest intraday percentage gain since Aug. 21
** Healthcare firm signs binding agreement to sell its diagnostic imaging arm, Lumus Imaging, to Affinity Equity Partners
** Says deal implies an enterprise value of A$965 mln ($657.65 mln)
** Says proceeds to be used to reduce debt, among others
** Stock almost flat this year, as of 0109 GMT
($1 = 1.4674 Australian dollars)
(Reporting by Rajasik Mukherjee in Bengaluru)
((Rajasik.Mukherjee@thomsonreuters.com;))
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