期刊
MAGNETIC RESONANCE IN MEDICINE
卷 72, 期 6, 页码 1762-1774出版社
WILEY
DOI: 10.1002/mrm.25077
关键词
deconvolution; control point interpolation method; residue function; arterial input function; dispersion; Bayesian Analysis
资金
- Royal Commission for the Exhibition of 1851 (UK)
- National Health and Medical Research Council (NHMRC) of Australia
- Australian Research Council (ARC)
- Victorian State Government
- Welcome Trust
- EPSRC [WT088877/Z/09/Z]
PurposeBolus dispersion in DSC-MRI can lead to errors in cerebral blood flow (CBF) estimation by up to 70% when using singular value decomposition analysis. However, it might be possible to correct for dispersion using two alternative methods: the vascular model (VM) and control point interpolation (CPI). Additionally, these approaches potentially provide a means to quantify the microvascular residue function. MethodsVM and CPI were extended to correct for dispersion by means of a vascular transport function. Simulations were performed at multiple dispersion levels and an in vivo analysis was performed on a healthy subject and two patients with carotid atherosclerotic disease. ResultsSimulations showed that methods that could not address dispersion tended to underestimate CBF (ratio in CBF estimation, CBFratio=0.57-0.77) in the presence of dispersion; whereas modified CPI showed the best performance at low-to-medium dispersion; CBFratio=0.99 and 0.81, respectively. The in vivo data showed trends in CBF estimation and residue function that were consistent with the predictions from simulations. ConclusionIn patients with atherosclerotic disease the estimated residue function showed considerable differences in the ipsilateral hemisphere. These differences could partly be attributed to dispersive effects arising from the stenosis when dispersion corrected CPI was used. It is thus beneficial to correct for dispersion in perfusion analysis using this method. Magn Reson Med 72:1762-1774, 2014. (c) 2014 Wiley Periodicals, Inc.
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