Abstract

For treatment with high intensity focused ultrasound (HIFU), delivering the correctamount of energy to the patient is critical. This paper describes a novel design of sensor basedon the pyroelectric principle for monitoring the output power from HIFU transducers of thetype used for tissue ablation. The sensor is intended to be minimally perturbing to theultrasound field, so that it can remain in the ultrasound field throughout treatment and providea constant monitor of ultrasound power. The main advantages of the technique are: power canbe measured or monitored without dismantling the HIFU system, thus reducing equipmentdowntime; power can be measured immediately before or during every patient treatment, thusensuring accurate dosimetry; power can be measured at the output levels used for treatment(whereas a radiation force balance may be damaged by overheating); the method usescomponents which are robust and simple to use compared to radiation force balances orhydrophone scanning systems.

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