title: Loosely coupled coaxial TEM applicators for deep-heating.
abstract: The development of a coaxial TEM (transverse electromagnetic) deep-heating, non-contacting applicator employing two axially spaced concentric sleeves is described which has electrostatic characteristics and has been named the ESA. Thermal data obtained with the FDA/CDRH elliptic-shaped human torso phantom (with fat overlay) showed nearly uniform heating (+/- 10%) throughout the inner cross-section. Saline tank measurements on a torso cross-section confirmed similar SAR uniformity. Animal experiments with a pig, both with and without blood flow, verified deep-heating and suggested that some preferential central heating occurred. The absence of excessive surface heating indicated that the major portion of the E-field excitation is axially aligned. The non-contacting applicator does not require a water bolus, and experiments showed that moderate patient movement had minor effect on performance.
authors.affiliation: UCLA Medical Center.
authors.forename: W H
authors.initials: WH
authors.lastname: Harrison
authors.forename: F K
authors.initials: FK
authors.lastname: Storm
mesh_terms: D000818:Animals; D004574:Electromagnetic Fields / Q000295:instrumentation; D055590:Electromagnetic Phenomena / Q000627:therapeutic use*; D005069:Evaluation Studies as Topic; D006358:Hot Temperature / Q000627:therapeutic use*; D006801:Humans; D055909:Magnetic Field Therapy; D008953:Models, Anatomic; D013552:Swine