RT Journal Article SR Electronic T1 Re: Optimization of the Gray Scale for Photoscanners—Reply JF Journal of Nuclear Medicine JO J Nucl Med FD Society of Nuclear Medicine SP 997 OP 997 VO 20 IS 9 A1 Wei Chang A1 Monte Blau YR 1979 UL http://jnm.snmjournals.org/content/20/9/997.1.abstract AB