title: An Ultrasound technique for the measurement of tardive dyskinesia.
abstract: A simple and portable ultrasound system, using a transducer attached to a pair of spectacles, to measure disorders of facial movement is described and applied to the measurement of tardive dyskinesia. Product-moment coefficients of correlation for the split-half and test-retest assessments of reliability in 20 patients were 0.96 and 0.93 respectively. Concurrent validity was confirmed by assessing the consistency between ultrasound scores and time-sampled scores based on video films (Pearson r = 0.86). Serial measurements of tardive dyskinesia over five months revealed striking individual consistency.
mesh_terms: D000328:Adult; D000368:Aged; D004409:Dyskinesia, Drug-Induced / Q000175:diagnosis*; D006801:Humans; D008875:Middle Aged; D009068:Movement; D014159:Transducers; D014465:Ultrasonics / Q000295:instrumentation; D014463:Ultrasonography