Improved tympanic thermometer based on a fiberoptic infrared radiometer and an otoscope and its use as a new diagnostic tool for acute otitis media

Gadi Fishman, Ari DeRow, Ophir Eyal, Vered Scharf, Abraham Shabtai, Dov Ophir, Abraham Katzir

Research output: Contribution to journalConference articlepeer-review

Abstract

Clinical diagnosis of Acute Otitis Media (AOM) in children is not easy. It was assumed that there is a difference ΔT between the Tympanic Membrane (TM) temperatures in the two ears in unilateral AOM and that an accurate measurement of ΔT may improve the diagnosis accuracy. An IR transmitting fiber, made of AgClBr, was coupled into a hand held otoscope and was used for the non-contact (radiometric) measurements of TT, the TM temperature. Experiments were carried out, first, on a laboratory model that simulated the human ear, including an artificial tympanic membrane and an artificial ear canal. Measurements carried out using commercially available tympanic thermometers showed that the temperature TC of the ear canal affected the results. TC did not affect the fiberoptic radiometer, and this device accurately measured the true temperature, TT of the tympanic membrane. A prospective blinded sampling of the TM temperature was then performed on 48 children with suspected AOM. The mean temperature difference between the ears, for children with unilateral AOM was ΔT = (0.68±0.27) °C. For children with bilateral AOM it was ΔT = (0.12±0.08) °C and for children with bilateral normal ears the difference was ΔT = (0.14±0.10) °C (p<0.001). It was demonstrated that for unilateral AOM the difference ΔT was proportional to the systemic temperature. In conclusion, the fiberoptic inferometric measurements of the TM can be a useful non-invasive diagnostic tool for AOM, when combined with other data.

Original languageEnglish
Pages (from-to)278-286
Number of pages9
JournalProceedings of SPIE - The International Society for Optical Engineering
Volume3590
StatePublished - 1999
Externally publishedYes
EventProceedings of the 1999 Lasers in Surgery: Advanced Characterization, Therapeutics, and Systems IX - San Jose, CA, USA
Duration: 23 Jan 199924 Jan 1999

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