Single-acquisition sequence for the measurement of oxygen partial pressure by hyperpolarized gas MRI.

Published

Journal Article

Magnetic resonance imaging (MRI) with hyperpolarized 3-helium gas (HP 3He) offers the possibility of studying functional lung parameters such as the alveolar oxygen concentration and oxygen depletion rate. Until now, a double-acquisition technique has been utilized to extract these parameters. A complicated single-acquisition technique was previously developed to avoid the necessity of performing two identical breathing maneuvers. The results obtained with this technique were significantly less accurate than the results obtained with the double-acquisition method. In this work, a novel, easily implemented single-acquisition sequence is presented that provides results comparable to those obtained with the established double-acquisition method. This method is demonstrated in a phantom and a pig model on a 1.5 T scanner using a 2D fast low-angle shot (FLASH) gradient-echo sequence. Numerical simulations of the time evolution of the oxygen concentration were performed. Simulation results are presented to support the experimental data. Various parameter regimes were experimentally and numerically investigated.

Full Text

Duke Authors

Cited Authors

  • Fischer, MC; Spector, ZZ; Ishii, M; Yu, J; Emami, K; Itkin, M; Rizi, R

Published Date

  • October 2004

Published In

Volume / Issue

  • 52 / 4

Start / End Page

  • 766 - 773

PubMed ID

  • 15389934

Pubmed Central ID

  • 15389934

Electronic International Standard Serial Number (EISSN)

  • 1522-2594

International Standard Serial Number (ISSN)

  • 0740-3194

Digital Object Identifier (DOI)

  • 10.1002/mrm.20239

Language

  • eng