Article

Two-dimensional temperature mapping for a moving agar-based tissue mimicking phantom using diagnostic ultrasound (en)

* Presenting author
Day / Time: 08.03.2023, 11:00-11:20
Room: Saal Y7
Typ: Regulärer Vortrag
Session: Ultraschall
Abstract: Ultrasonic hyperthermia in combination with radio therapy has the potential to improve the treatment of cancer. In this method a high-intensity focused ultrasound (HIFU) transducer is used to deliver heat for a hyperthermia process. An accurate spatial and temporal temperature map of the heated region is essential to control the therapy efficiency. The echo-time-shift method using diagnostic ultrasound is a promising non-invasive tool to estimate the elevated temperature in tissue and tissue mimicking samples. The application, however, is limited in a living organism where the tissue suffers from motion or deformation due to breathing and cardiac cycle. In this study, we demonstrate the applicability of the echo-shift method to estimate the temperature map even for a moving region of interest. An agar-based tissue mimicking phantom is heated in the post-focal region of the HIFU beam while the diagnostic scanner head performs a periodical displacement simulating tissue movement. A motion compensation technique has been developed and combined with the echo-shift method to estimate the temperature distribution in the moving heated region. Examples for practically relevant case are presented and further development steps of the method are discussed.
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