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Abstract
PURPOSE: To compare absolute cerebral blood flow (CBF) estimates obtained by model-free arterial spin labeling (ASL) and dynamic susceptibility contrast MRI (DSC-MRI), corrected for partial volume effects (PVEs). METHODS: CBF was measured using DSC-MRI and model-free ASL (quantitative signal targeting with alternating radiofrequency labeling of arterial regions) at 3 T in 15 subjects with brain tumor, and the two modalities were compared with regard to CBF estimates in normal gray matter (GM) and DSC-to-ASL CBF ratios in selected tumor regions. The DSC-MRI CBF maps were calculated using a global arterial input function (AIF) from the sylvian-fissure region, but, in order to minimize PVEs, the AIF time integral was rescaled by a venous output function time integral obtained from the sagittal sinus. RESULTS: In GM, the average DSC-MRI CBF estimate was 150+/-45 ml/(min 100 g) (mean+/-SD) while the corresponding ASL CBF was 44+/-10 ml/(min 100 g). The linear correlation between GM CBF estimates obtained by DSC-MRI and ASL was r=.89, and observed DSC-to-ASL CBF ratios differed by less than 3% between GM and tumor regions. CONCLUSIONS: A satisfactory positive linear correlation between the CBF estimates obtained by model-free ASL and DSC-MRI was observed, and DSC-to-ASL CBF ratios showed no obvious tissue dependence.
Original language | English |
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Pages (from-to) | 1-7 |
Journal | Magnetic Resonance Imaging |
Volume | 28 |
Issue number | 1 |
DOIs | |
Publication status | Published - 2010 |
Subject classification (UKÄ)
- Radiology, Nuclear Medicine and Medical Imaging
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Optimisation and Validation of Dynamic Susceptibility Contrast MRI
Knutsson, L. (PI) & Wirestam, R. (PI)
1997/01/01 → …
Project: Research
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MRI brain perfusion quantification at 3 tesla using arterial spin labeling
Knutsson, L. (PI) & Wirestam, R. (PI)
2006/07/02 → 2017/02/17
Project: Research