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Magnetic Resonance Imaging Quantification of Pulmonary Perfusion using Calibrated Arterial Spin Labeling
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Perfusion tensor imaging.

Lawrence R Frank1, Kun Lu, Eric C Wong

  • 1Center for Scientific Computation in Imaging, UCSD, La Jolla, California 92093-0854, USA. lfrank@ucsd.edu

Magnetic Resonance in Medicine
|November 26, 2008
PubMed
Summary
This summary is machine-generated.

Velocity Selective ASL (VSASL) enables directional velocity encoding for detailed perfusion mapping. This new Perfusion Tensor Imaging (PTI) method reconstructs the local perfusion field, revealing flow characteristics in the brain and muscle.

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Area of Science:

  • Medical Imaging
  • Biophysics
  • Physiology

Background:

  • Arterial spin labeling (ASL) noninvasively measures tissue perfusion characteristics.
  • Standard ASL uses spatial tagging; Velocity Selective ASL (VSASL) uses velocity-dependent tags.
  • VSASL's velocity tagging depends on the vascular velocity profile.

Purpose of the Study:

  • To introduce and demonstrate a novel application of VSASL for detailed perfusion measurement.
  • To enable reconstruction of the local perfusion field using directional velocity encoding.
  • To characterize perfusion using a perfusion tensor (P) for derived metrics.

Main Methods:

  • Utilized VSASL with velocity encoding in arbitrary directions.
  • Reconstructed the local perfusion field by measuring perfusion with specified angular resolution.
  • Developed Perfusion Tensor Imaging (PTI) to derive perfusion anisotropy and principal flow directions.

Main Results:

  • Demonstrated the feasibility of PTI in human brain and skeletal muscle.
  • Showcased the ability to measure perfusion with directional angular resolution.
  • Enabled derivation of mean perfusion, perfusion anisotropy, and principal flow directions.

Conclusions:

  • VSASL's directional velocity encoding allows for advanced perfusion tensor reconstruction.
  • PTI provides a comprehensive characterization of the local perfusion field.
  • This technique has potential applications in understanding tissue perfusion dynamics.