Vessel-encoded arterial spin-labeling using pseudocontinuous tagging

Magn Reson Med. 2007 Dec;58(6):1086-91. doi: 10.1002/mrm.21293.


A new signal-to-noise ratio (SNR) efficient method is introduced for the mapping of vascular territories based on pseudocontinuous arterial spin labeling (ASL). A pseudocontinuous tagging pulse train is modified using additional transverse gradient pulses and phase cycling to place some arteries in a tag condition, while others passing through the same tagging plane are in a control condition. This is combined with a Hadamard or similar encoding scheme such that all vessels of interest are fully inverted or relaxed for nearly all of the encoding cycles, providing optimal SNR. The relative tagging efficiency for each vessel is measured directly from the ASL data and is used in the decoding process to improve the separation of vascular territories. High SNR maps of left carotid, right carotid, and basilar territories are generated in 6 min of scan time.

Publication types

  • Research Support, N.I.H., Extramural

MeSH terms

  • Adult
  • Blood Flow Velocity / physiology*
  • Cerebral Arteries / anatomy & histology*
  • Cerebral Arteries / physiology*
  • Female
  • Humans
  • Image Enhancement / methods*
  • Image Interpretation, Computer-Assisted / methods*
  • Magnetic Resonance Imaging / methods*
  • Male
  • Middle Aged
  • Spin Labels


  • Spin Labels