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Imaging Studies VII: Vascular Imaging01:19

Imaging Studies VII: Vascular Imaging

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Tumor Hypoxia Assessment: In Vivo 3D Oxygen Imaging Through Electron Paramagnetic Resonance
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Multi-shot turbo spin-echo for 3D vascular space occupancy imaging.

Fabiola R Cretti1, Paul E Summers, Carlo A Porro

  • 1Department of Biomedical, Metabolic and Neural Sciences, University of Modena and Reggio Emilia, via G. Campi 287, I-41125 Modena, Italy. fcretti@ospedaliriuniti.bergamo.it

Magnetic Resonance Imaging
|April 23, 2013
PubMed
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A new 3D Turbo Spin-Echo (TSE) Vascular Space Occupancy (VASO) MRI sequence effectively maps brain activity. This technique shows robust responses comparable to BOLD, offering a promising alternative for functional neuroimaging.

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Area of Science:

  • Neuroimaging
  • Magnetic Resonance Imaging (MRI)
  • Functional Neuroimaging

Background:

  • Vascular space occupancy (VASO) MRI measures cerebral blood volume, offering a potential alternative to blood oxygenation level dependent (BOLD) fMRI for neurovascular response mapping.
  • Conventional VASO implementations often use echo-planar imaging, risking confounding BOLD effects, and advanced multi-slice/3D techniques require specialized hardware.
  • There is a need for accessible VASO techniques that provide wider volumetric coverage and are less susceptible to artifacts.

Purpose of the Study:

  • To implement and evaluate a short-echo time, multi-shot 3D Turbo Spin-Echo (TSE) VASO sequence for functional brain mapping.
  • To assess the feasibility of using this sequence on a routine clinical scanner for robust neurovascular response detection.
  • To compare the performance of the developed VASO sequence with conventional BOLD imaging.

Main Methods:

  • Implementation of a novel 3D TSE VASO sequence with short echo time and multi-shot acquisition.
  • Acquisition of 8-slice coverage on a standard clinical MRI scanner.
  • Testing the sequence in 10 healthy subjects performing a block-design finger tapping task to elicit motor cortex activation.

Main Results:

  • Significant VASO responses, inversely correlated with task performance, were detected at both individual and group levels.
  • The spatial localization and extent of the observed VASO responses closely matched those obtained with conventional BOLD imaging.
  • Robust and consistent VASO signals were observed despite limitations in spatial coverage and temporal resolution.

Conclusions:

  • The developed 3D TSE VASO sequence is a viable tool for functional neuroimaging on routine clinical scanners.
  • This susceptibility-insensitive volumetric TSE VASO sequence demonstrates advantages in brain regions where conventional BOLD and echo-planar VASO are compromised.
  • The findings support the potential of this advanced VASO technique as a reliable alternative for functional mapping of neurovascular coupling.