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Temperature mapping near the surface of ultrasound transducers using susceptibility- compensated magnetic resonance imaging

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4 Author(s)
Webb, A.G. ; Dept. of Bioeng., Pennsylvania State Univ., University Park, PA ; Neuberger, T. ; Eun-Joo Park ; Smith, N.

Magnetic resonance imaging (MRI)-based temperature mapping very close to the surface of an ultrasound transducer is not possible due to the large magnetic susceptibility-induced image artifacts that arise from the materials used in transducer construction. Here, it is shown in phantoms that "susceptibility-compensated" MRI sequences can be used to measure thermal increases ~1 mm from the surface of a 4-element cymbal array transducer, which has been used widely for noninvasive transdermal drug delivery. The estimated temperatures agree well with those measured using thermocouples.

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Ultrasonics, Ferroelectrics, and Frequency Control, IEEE Transactions on  (Volume:56 ,  Issue: 6 )