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• W2059986882 abstract "The purpose of this work is to assess a fast technique that measures tissue stiffness and temperature during focused ultrasound thermal therapy (FUS). A one-dimensional (1D) MR elastography (MRE) pulse sequence was evaluated for the purpose of obtaining rapid measurements of thermally induced changes in tissue stiffness and temperature for monitoring FUS treatments. The accuracy of the 1D measurement was studied by comparing tissue displacements measured by 1D MRE with those measured by the well-established 2D MRE pulse sequence. The reproducibility of the 1D MRE measurement was assessed, in gel phantoms and ex vivo porcine tissue, for varied FUS intensity levels (31.5–199.9 W cm−2) and over a range of displacements at the focus (0.1–1 µm). Temperature elevations in agarose gel phantoms were measured using 1D MRE and calibrated using fiberoptic-thermometer-based measurements. The 1D MRE displacement measurements are highly correlated with those obtained with the 2D technique (R2 = 0.88–0.93), indicating that 1D MRE can successfully measure tissue displacement. Ten repeated trials at each FUS power level yielded a minimum detectable displacement change of 0.2 µm in phantoms and 0.4 µm in tissue (at 95% confidence level). The 1D MRE temperature measurements correlated well with temperature changes measured simultaneously with fiberoptic thermometers (R2 = 0.97). The 1D MRE technique is capable of detecting tissue displacements as low as 0.4 µm, which is an order of magnitude smaller than 5 µm displacements expected during FUS therapy (Le et al 2005 AIP Conf. Proc.: Ther. Ultrasound 829 186–90). Additionally, 1D MRE was shown to provide adequate measurements of temperature elevations in tissue. These findings indicate that 1D MRE may be an effective tool for monitoring FUS treatments." @default.
• W2059986882 created "2016-06-24" @default.
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• W2059986882 date "2007-09-14" @default.
• W2059986882 modified "2023-10-06" @default.
• W2059986882 title "Preliminary assessment of one-dimensional MR elastography for use in monitoring focused ultrasound therapy" @default.
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• W2059986882 doi "https://doi.org/10.1088/0031-9155/52/19/012" @default.
• W2059986882 hasPubMedId "https://pubmed.ncbi.nlm.nih.gov/17881808" @default.
• W2059986882 hasPublicationYear "2007" @default.
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