Design and evaluation of a 32-channel phased-array coil for lung imaging with hyperpolarized 3-helium

Magn Reson Med. 2010 Feb;63(2):456-64. doi: 10.1002/mrm.22265.

Abstract

Imaging with hyperpolarized 3-helium is becoming an increasingly important technique for MRI diagnostics of the lung but is hampered by long breath holds (>20 sec), which are not always applicable in patients with severe lung disease like chronic obstructive pulmonary disease (COPD) or alpha-1-anti-trypsin deficiency. Additionally, oxygen-induced depolarization decay during the long breath holds complicates interpretation of functional data such as apparent diffusion coefficients. To address these issues, we describe and validate a 1.5-T, 32-channel array coil for accelerated (3)He lung imaging and demonstrate its ability to speed up imaging (3)He. A signal-to-noise ratio increase of up to a factor of 17 was observed compared to a conventional double-resonant birdcage for unaccelerated imaging, potentially allowing increased image resolution or decreased gas production requirements. Accelerated imaging of the whole lung with one-dimensional and two-dimensional acceleration factors of 4 and 4 x 2, respectively, was achieved while still retaining excellent image quality. Finally, the potential of highly parallel detection in lung imaging is demonstrated with high-resolution morphologic and functional images.

Publication types

  • Evaluation Study
  • Research Support, Non-U.S. Gov't

MeSH terms

  • Computer-Aided Design
  • Equipment Design
  • Equipment Failure Analysis
  • Helium*
  • Humans
  • Image Enhancement / instrumentation*
  • Isotopes
  • Lung / anatomy & histology*
  • Magnetic Resonance Imaging / instrumentation*
  • Radiopharmaceuticals
  • Reproducibility of Results
  • Sensitivity and Specificity
  • Transducers*

Substances

  • Isotopes
  • Radiopharmaceuticals
  • Helium