Temperature mapping near the surface of ultrasound transducers using susceptibility- compensated magnetic resonance imaging |
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| Authors: | Webb A.G. Neuberger T. Eun-joo Park Smith N. |
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| Affiliation: | Dept. of Bioeng., Pennsylvania State Univ., University Park, PA; |
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| Abstract: | 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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