Evaluation of Ideal Bolus Material to Maintain Elevated Temperatures after Superficial Hyperthermia for Cancer Patients

Notter M

Published on: 2023-03-07

Abstract

When applying superficial hyperthermia (sHT) prior to radiotherapy (RT) the time interval can be reduced to less than 5 min between the two treatments. In order to maintain the elevated temperature after sHT during the transfer to the linac, preheated blankets (PB) and preheated Bolus (PBo) can be applied. A very adaptable bolus is presented in this study: preheated cow dung bolus (PCBo) allows a better adaption to surface. Even curved, convex or concave regions can be flawlessly covered. PCBo provides with its cellulose fibers a rather rigid structure to keep inserted temperature probes to control hyperthermia. Therefore we recommend this novel technique specifically in challenging regions e.g. breast, thoracic wall or head & neck. A “quasi-simultaneous” HT-RT application should lead to improved local tumor control. This is provided by this very adaptable PCBo, which keeps heat during transfer from superficial hyperthermia to the linac room.