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Trans-cranial focused ultrasound without hair shaving: feasibility study in an ex vivo cadaver model

Matthew Eames 1 Arik Hananel 1, 2, * John Snell 1, 3 Neal Kassell 1, 3 Jean-Francois Aubry 2, 4
* Corresponding author
4 Physique des ondes pour la médecine
ESPCI Paris - Ecole Superieure de Physique et de Chimie Industrielles de la Ville de Paris, INSERM - Institut National de la Santé et de la Recherche Médicale : U979, CNRS - Centre National de la Recherche Scientifique : UMR7587
Abstract : In preparing a patient for a trans-cranial magnetic resonance (MR)-guided focused ultrasound procedure, current practice is to shave the patient's head on treatment day. Here we present an initial attempt to evaluate the feasibility of trans-cranial focused ultrasound in an unshaved, ex vivo human head model. A human skull filled with tissue-mimicking phantom and covered with a wig made of human hair was sonicated using 220- and 710-kHz head transducers to evaluate the feasibility of acoustic energy transfer. Heating at the focal point was measured by MR proton resonance shift thermometry. Results showed that the hair had a negligible effect on focal spot thermal rise at 220 kHz and a 17% drop in temperature elevation when using 710 kHz.
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Matthew Eames, Arik Hananel, John Snell, Neal Kassell, Jean-Francois Aubry. Trans-cranial focused ultrasound without hair shaving: feasibility study in an ex vivo cadaver model. Journal of Therapeutic Ultrasound, BioMed Central, 2013, 1 (1), pp.24. ⟨inserm-00923402⟩

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