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Temperature Elevation in an Instrumented Phantom Insonated by B-Mode Imaging, Pulse Doppler and Shear Wave Elastography

Issaoui, M; Miloro, P; Balandraud, X; Rivens, I; Grédiac, M; Blaysat, B; Ouchchane, L; Delabaere, A; Sauvant-Rochat, M-P; Lemery, D (2020) Temperature Elevation in an Instrumented Phantom Insonated by B-Mode Imaging, Pulse Doppler and Shear Wave Elastography. Ultrasound in Medicine & Biology, 46 (12). pp. 3317-3326. ISSN 03015629

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Abstract

Diagnostic ultrasound is the gold standard for obstetric scanning and one of the most important imaging techniques for perinatal and neonatal monitoring and diagnosis. Ultrasound provides detailed real-time anatomical information, including blood flow measurements and tissue elasticity. The latter is provided through various techniques including Shear Wave Elastography (SWE). SWE is increasingly used in many areas of medicine, especially in detection and diagnosis of breast, thyroid, and prostate cancers and liver disease. More recently, SWE has found application in gynaecology and obstetrics. This method mimics manual palpation, showing the elastic properties of soft biological tissues and providing an indication of their internal structure. Despite its rising potential and expanding clinical interest in obstetrics and gynaecology (such as for assessment of cervical ripening or organ development and structure during pregnancy), its effects on and potential risks to the developing fetus remain unknown. Risks should be evaluated before recommendations are made on the use of SWE by regulatory bodies. Since ultrasound is known to produce thermal and mechanical effects, this study measured the temperature increase caused by B-mode, Pulse-Doppler (PD) and SWE, using an instrumented phantom with eleven embedded thermocouples. Experiments were performed with a high-frequency Aixplorer® diagnostic ultrasound system (Supersonic Imagine, Aix-en-Provence, France). As expected, the largest heating was detected by the thermocouple closest to the surface in contact with the transducer (2.9°C for SWE, 1.2°C for PD, 0.7°C for B-mode after 380-second excitation). Both conduction from the transducer face and direct heating due to ultrasound waves contribute to temperature increase in the phantom with SWE showing a larger temperature increase than PD and B-mode. This manuscript offers a methodological approach and reference data for future safety studies, as well as initial recommendations about SWE safety in obstetrics and
gynaecology.

Item Type: Article
Subjects: Acoustics > Ultrasound
Divisions: Medical Physics
Identification number/DOI: 10.1016/j.ultrasmedbio.2020.08.021
Last Modified: 03 Feb 2021 15:27
URI: http://eprintspublications.npl.co.uk/id/eprint/9042

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