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Improved sensitivity and temporal resolution in perfusion FMRI using velocity selective inversion ASL.
Hernandez-Garcia, Luis; Nielsen, Jon-Fredrik; Noll, Douglas C.
Afiliação
  • Hernandez-Garcia L; University of Michigan FMRI Laboratory, Ann Arbor, Michigan.
  • Nielsen JF; University of Michigan FMRI Laboratory, Ann Arbor, Michigan.
  • Noll DC; University of Michigan FMRI Laboratory, Ann Arbor, Michigan.
Magn Reson Med ; 81(2): 1004-1015, 2019 02.
Article em En | MEDLINE | ID: mdl-30187951
ABSTRACT

PURPOSE:

This work aims to investigate the utility of velocity selective inversion pulses for perfusion weighted functional MRI.

METHODS:

Tracer kinetic properties of velocity selective inversion (VSI) pulses as an input function for an arterial spin labeling (ASL) experiment were characterized in a group of healthy participants. Numerical simulations were conducted to search for a robust set of timing parameters for FMRI time series acquisition with maximal signal to noise ratio efficiency. The performance of three VSI pulse sequences with different timing parameters was compared with a pseudocontinuous ASL sequence in a simple FMRI experiment conducted on healthy participants.

RESULTS:

The fit to the tracer kinetic model yielded arterial CBV of 1.24% ± 0.52% and 0.45 ± 0.11% and perfusion rates of 60.8 ± 32.3 and 34.4 ± 5.4 mL/min/100 g for gray and white matter, respectively. Bolus arrival times were estimated as 75.7 ± 21 ms and 349 ± 78 ms for gray and white matter, respectively. The FMRI experiments showed that VSI pulses yield comparable sensitivity to PCASL with similar timing parameters (TR = 4 s). However, VSI pulses could be used at a faster acquisition speed (TR = 3 s) and were more sensitive to neuronal activity than PCASL pulses, as evidenced by the 31% higher Z scores obtained on average in the active regions.

CONCLUSION:

VSI pulses can be very beneficial for perfusion weighted functional MRI because of their tracer kinetic characteristics, which allow a faster acquisition rate while maintaining an efficient labeling input function.
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Texto completo: 1 Coleções: 01-internacional Base de dados: MEDLINE Assunto principal: Artérias / Marcadores de Spin / Imageamento por Ressonância Magnética Tipo de estudo: Diagnostic_studies / Prognostic_studies Limite: Adult / Humans / Middle aged Idioma: En Ano de publicação: 2019 Tipo de documento: Article

Texto completo: 1 Coleções: 01-internacional Base de dados: MEDLINE Assunto principal: Artérias / Marcadores de Spin / Imageamento por Ressonância Magnética Tipo de estudo: Diagnostic_studies / Prognostic_studies Limite: Adult / Humans / Middle aged Idioma: En Ano de publicação: 2019 Tipo de documento: Article