The QUASAR reproducibility study, Part II: Results from a multi-center Arterial Spin Labeling test-retest study

Esben Thade Petersen, Kim Mouridsen, Xavier Golay

Research output: Contribution to journalArticle

Abstract

Arterial Spin Labeling (ASL) is a method to measure perfusion using magnetically labeled blood water as an endogenous tracer. Being fully non-invasive, this technique is attractive for longitudinal studies of cerebral blood flow in healthy and diseased individuals, or as a surrogate marker of metabolism. So far, ASL has been restricted mostly to specialist centers due to a generally low SNR of the method and potential issues with user-dependent analysis needed to obtain quantitative measurement of cerebral blood flow (CBF). Here, we evaluated a particular implementation of ASL (called Quantitative STAR labeling of Arterial Regions or QUASAR), a method providing user independent quantification of CBF in a large test-retest study across sites from around the world, dubbed "The QUASAR reproducibility study". Altogether, 28 sites located in Asia, Europe and North America participated and a total of 284 healthy volunteers were scanned. Minimal operator dependence was assured by using an automatic planning tool and its accuracy and potential usefulness in multi-center trials was evaluated as well. Accurate repositioning between sessions was achieved with the automatic planning tool showing mean displacements of 1.87 ± 0.95 mm and rotations of 1.56 ± 0.66°. Mean gray matter CBF was 47.4 ± 7.5 [ml/100 g/min] with a between-subject standard variation SDb = 5.5 [ml/100 g/min] and a within-subject standard deviation SDw = 4.7 [ml/100 g/min]. The corresponding repeatability was 13.0 [ml/100 g/min] and was found to be within the range of previous studies.

Original languageEnglish (US)
Pages (from-to)104-113
Number of pages10
JournalNeuroImage
Volume49
Issue number1
DOIs
StatePublished - Jan 1 2010
Externally publishedYes

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Cerebrovascular Circulation
North America
Longitudinal Studies
Healthy Volunteers
Perfusion
Biomarkers
Water

Keywords

  • Arterial Spin Labeling
  • Cerebral blood flow
  • Perfusion, Multi-center trial
  • Reproducibility

ASJC Scopus subject areas

  • Cognitive Neuroscience
  • Neurology

Cite this

The QUASAR reproducibility study, Part II : Results from a multi-center Arterial Spin Labeling test-retest study. / Petersen, Esben Thade; Mouridsen, Kim; Golay, Xavier.

In: NeuroImage, Vol. 49, No. 1, 01.01.2010, p. 104-113.

Research output: Contribution to journalArticle

Petersen, Esben Thade ; Mouridsen, Kim ; Golay, Xavier. / The QUASAR reproducibility study, Part II : Results from a multi-center Arterial Spin Labeling test-retest study. In: NeuroImage. 2010 ; Vol. 49, No. 1. pp. 104-113.
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