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Femoral head activity in Perthes' disease.

Femoral Head Activity in Perthes' Disease In their article on quantitative bone imaging in Legg-Perthes' Disease, Morley, Short, and Dowsett stated that â€œqualitative information from femoral-head scintograms can be unreliable (particularly in bilateral disease) and is of doubtful value in follow upâ€•(1). Unfortunately they did not discuss the previously publishedobservationthat pinhole collimator imagesprovide sufficient resolution for the evaluation and subsequent followup in Legg-Perthes' Disease (2). In our laboratory we too have found that the high quality images provided by current equip ment and radiopharmaceuticals are very useful in the examina tion of the femoral head in children. In our procedure 150,000 count pinhole images requiring 1020 mm per image with Tc-99m MDP and a 3-mm pinhole aperture are acquired in a 256 x 256 computer matrix to facilitate selec tion of optimum settings for intensity and information density.