
Ronnie Wirestam
Professor

Dynamic susceptibility contrast perfusion MRI using phase-based venous output functions: : comparison with pseudo-continuous arterial spin labelling and assessment of contrast agent concentration in large veins.
Författare
Summary, in English
OBJECTIVES: Contrast agent (CA) relaxivities are generally not well established in vivo, and the relationship between frequency/phase shift and magnetic susceptibility might be a useful alternative for CA quantification.
MATERIALS AND METHODS: Twenty volunteers (25-84 years old) were investigated using test-retest pre-bolus dynamic susceptibility-contrast (DSC) magnetic resonance imaging (MRI). The pre-bolus phase-based venous output function (VOF) time integral was used for arterial input function (AIF) rescaling. Resulting cerebral blood flow (CBF) data for grey matter (GM) were compared with pseudo-continuous arterial spin labelling (ASL). During the main bolus CA passage, the apparent spatial shift (pixel shift) of the superior sagittal sinus (seen in single-shot echo-planar imaging (EPI)) was converted to CA concentration and compared with conventional ΔR2*-based data and with a predicted phase-based VOF from the pre-bolus experiment.
RESULTS: The phase-based pre-bolus VOF resulted in a reasonable inter-individual GM CBF variability (coefficient of variation 28 %). Comparison with ASL CBF values implied a tissue R2*-relaxivity of 32 mM(-1) s(-1). Pixel-shift data at low concentrations (data not available at peak concentrations) were in reasonable agreement with the predicted phase-based VOF.
CONCLUSION: Susceptibility-induced phase shifts and pixel shifts are potentially useful for large-vein CA quantification. Previous predictions of a higher R2*-relaxivity in tissue than in blood were supported.
Avdelning/ar
- Medicinsk strålningsfysik, Lund
- BioCARE: Biomarkers in Cancer Medicine improving Health Care, Education and Innovation
- Diagnostisk radiologi, Lund
- MR Physics
- MultiPark: Multidisciplinary research focused on Parkinson´s disease
Publiceringsår
2016-12
Språk
Engelska
Sidor
823-831
Publikation/Tidskrift/Serie
Magnetic Resonance Materials in Physics, Biology, and Medicine
Volym
29
Issue
6
Dokumenttyp
Artikel i tidskrift
Förlag
Springer
Ämne
- Medical Imaging
- Other Physics Topics
Aktiv
Published
Projekt
- Optimisation and Validation of Dynamic Susceptibility Contrast MRI
- MRI brain perfusion quantification at 3 tesla using arterial spin labeling
Forskningsgrupp
- MR Physics
ISBN/ISSN/Övrigt
- ISSN: 1352-8661