Electromagnetic redesign of the HYPERcollar applicator: toward improved deep local head-and-neck hyperthermia.

Abstract:

:Accumulating evidence shows that hyperthermia improves head-and-neck cancer treatment. Over the last decade, we introduced a radiofrequency applicator, named HYPERcollar, which enables local heating also of deep locations in this region. Based on clinical experience, we redesigned the HYPERcollar for improved comfort, reproducibility and operator handling. In the current study, we analyze the redesign from an electromagnetic point of view. We show that a higher number of antennas and their repositioning allow for a substantially improved treatment quality. Combined with the much better reproducibility of the water bolus, this will substantially minimize the risk of underexposure. All improvements combined enable a reduction of hot-spot prominence (hot-spot to target SAR quotient) by 32% at an average of 981 W, which drastically reduces the probability for system power to become a treatment limiting source. Moreover, the power deposited in the target selectively can be increased by more than twofold. Hence, we expect that the HYPERcollar redesign currently under construction allows us to double the clinically applied power to the target while reducing the hot-spots, resulting in higher temperatures and, consequently, better clinical outcome.

journal_name

Phys Med Biol

authors

Togni P,Rijnen Z,Numan WC,Verhaart RF,Bakker JF,van Rhoon GC,Paulides MM

doi

10.1088/0031-9155/58/17/5997

subject

Has Abstract

pub_date

2013-09-07 00:00:00

pages

5997-6009

issue

17

eissn

0031-9155

issn

1361-6560

journal_volume

58

pub_type

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