Psychophysical assessment of the performance of clinical radioisotope imaging devices 'Psychophysical assessment of the performance of clinical radioisotope imaging devices' was written by P.F. Sharp, Department of Medical Physics, University of Aberdeen for presentation at the 7th L H Gray conference: Medical Images held in Leeds in 1976. This copy is an offprint from a conference publication 'Medical images: formation, perception and measurement' edited by George A. Hay and published by John Wiley & son. 1976