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Overview of hyperthermia in oncology
Published in Clifford L. K. Pang, Kaiman Lee, Hyperthermia in Oncology, 2015
Clifford L. K. Pang, Kaiman Lee
Noninvasive temperature measurement, also called nonintrusive thermometry, is the development direction and research hot spot of the temperature measurement technology, with main research based on microwave, including microwave radiometer method and CT analysis method; ultrasonic wave, including projection mode and reflection mode, such as sound velocity–based nonintrusive thermometry, and ultrasonic nonlinear parameter–based nonintrusive thermometry; and electromagnetic wave, such as magnetic resonance (MR)–based nonintrusive thermometry (T1 and M0 methods, D method, and proton resonance frequency [PRF] method).
Computer simulations of an irrigated radiofrequency cardiac ablation catheter and experimental validation by infrared imaging
Published in International Journal of Hyperthermia, 2021
Christian Rossmann, Anjan Motamarry, Dorin Panescu, Dieter Haemmerich
The catheter used in this study features a helical microwave antenna embedded in the catheter tip (Figure 1). This antenna enables a microwave radiometer to measure deep tissue temperatures even in irrigated catheters, as demonstrated in a prior study with an earlier prototype of this catheter and identical microwave antenna [15]. Tissue temperature estimates based on microwave radiometry enable temperature-controlled ablation. To our knowledge, there is only one recent irrigated catheter for which temperature-controlled ablation has been demonstrated [13]. Consequently, applied power can be controlled to obtain desired tissue temperatures. In this study, we evaluated the performance of this catheter under conditions of varying irrigation and blood flow, including quantifying optimal power levels for each condition.
Imaging-based internal body temperature measurements: The journal Temperature toolbox
Published in Temperature, 2020
Juho Raiko, Kalle Koskensalo, Teija Sainio
In 1974, Edrich et al. [100] and Enander et al. [101] suggested that internal body temperatures could be measured by a radiometer measuring millimeter wavelength thermal noise signals. A microwave radiometer is a passive receiver measuring the intensity of thermally generated microwave electromagnetic noise by all substances with a temperature above 0 K. The intensity of the microwave noise signal correlates directly with the absolute temperature of the target tissue [102]. The antenna of the radiometer device is placed on the surface of the body above the target tissue to perform the measurement of the deep temperature (see Figure 8). The microwave radiation received by the antenna is then converted to absolute temperature based on the weighted average of the radiation pattern of the target material [103]. The advantage of microwaves over infrared radiation is the higher tissue penetration of radio waves with high wavelength: while infrared has poor penetration and can be used to measure only the surface temperature, radio waves penetrate several centimeters of subcutaneous tissue and can be used to measure internal tissue temperature. The power P of the radio length radiation of the examined tissue can be described as: