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The use of portable radiometry to assess Raynaud's phenomenon: a practical alternative to thermal imaging

Cherkas, LF; Howell, K; Carter, L; Black, CM; MacGregor, AJ; (2001) The use of portable radiometry to assess Raynaud's phenomenon: a practical alternative to thermal imaging. RHEUMATOLOGY (OXFORD) , 40 (12) pp. 1384-1387.

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Objectives. To compare the performance of a portable radiometer with thermal imaging and to assess the potential for radiometry to provide a practical alternative for assessing vascular responsiveness in Raynaud's phenomenon (RP). Methods. Subjects comprised 18 patients with diagnosed RP and 19 non-RP subjects. A thermal imager (Starsight) and a portable radiometer (Cyclops) measured digital temperature at baseline and the subsequent drop and rise in temperature following a cold challenge test. Results. The intra-class correlations between the two instruments for all three measures exceeded 80%. The overall performance of each instrument was almost the same, the Starsight thermal imager correctly classifying 84% of subjects as RP or non-RP and the Cyclops portable radiometer correctly classifying 86% of subjects. The sensitivity of the thermal imager was 83%, compared with 89% for the portable radiometer; the specificity of both instruments was 84%. The positive and negative predictive values of the thermal imager were 83 and 84% respectively, and those for the portable radiometer were 84 and 89%. Conclusions. The two instruments performed equally well and the differences between them in their absolute measurements did not influence their ability to detect RP. Portable radiometry provides a practical, cheap, accurate and reliable alternative to thermal imaging and has the potential to be used in range of clinical and epidemiological settings

Type: Article
Title: The use of portable radiometry to assess Raynaud's phenomenon: a practical alternative to thermal imaging
Additional information: UI - 21625190 LA - eng PT - Clinical Trial PT - Controlled Clinical Trial PT - Journal Article DA - 20011225 IS - 1462-0324 SB - IM CY - England
Keywords: 00 - import01052002, ABILITY, absolute, As, CHALLENGE, classification, clinical, Cold, cold challenge test, Correlation, Dec, diagnosis, difference, digital, drop, English, epidemiological, imaging, INSTRUMENT, INSTRUMENTS, measurement, MEASUREMENTS, Methods, negative, OXFORD, Patient, patients, performance, positive, predictive value, PRESS, Radiometry, RANGE, Raynaud's phenomenon, RESPONSIVENESS, Result, Rheumatology, RISE, RP, Sensitivity, Setting, SETTINGS, SPECIFICITIES, SPECIFICITY, ST, SUBSEQUENT, Temperature, thermal, Thermography, Use, VALUES, vascular, ABILITY, Adolescence, adult, Clinical trial, CLINICAL-TRIAL, Controlled clinical trial, epidemiology, Female, IM, instrumentation, LA, Middle Age, Raynaud's Disease, Regional Blood Flow, Support, Non-U.S.Gov't, TRIAL
UCL classification: UCL > School of Life and Medical Sciences
UCL > School of Life and Medical Sciences > Faculty of Medical Sciences
URI: http://discovery.ucl.ac.uk/id/eprint/188136
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