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

IEEE Trans Ultrason Ferroelectr Freq Control. 2009 Jun;56(6):1145-50. doi: 10.1109/TUFFC.2009.1156.

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 approximately 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.

MeSH terms

  • Artifacts*
  • Equipment Failure Analysis
  • Magnetic Resonance Imaging / methods*
  • Reproducibility of Results
  • Sensitivity and Specificity
  • Temperature
  • Thermography / methods*
  • Transducers*
  • Ultrasonography / instrumentation*