The Effects of Residual Temperature Rise on Ultrasound Heating

Abstract

Recently, Karagoz and Kartal (2006) considered the temperature rise ΔT in tissue at the focus of a stationary transducer, which is on for some time, after which an off-period follows, which finally is followed by a second on-period. The temperature rise caused by the first heating period remaining at (the beginning of) the second heating period is called the residual temperature rise (see their Fig. 1). This paper contains a surprising result: continuous heating (their Fig. 2) gives a smaller temperature rise than heating at the same power level interrupted for a certain period (their Fig.