Abstract:
BACKGROUND AND PURPOSE:Diffusion MRI characteristics have been used as biomarkers to guide prognosis in cerebral pathologies including brain metastases. The measurement of ADC is often described poorly in clinical and research studies with little detail given to the practical considerations of where to place ROIs, which post processing software package to use and how reproducible the resulting metrics will be. METHOD:We investigated a series of 12 patients with brain metastases and preoperative DWI. Three post processing platforms were used. ROI were placed over the tumour, peritumoural region and across the brain-tumour interface. These recordings were made by a neurosurgeon and a neuroradiologist. Inter-intra-observer variability was assessed using Bland-Altman analysis. An exploratory analysis of DWI with overall survival and tumour type was made. RESULTS:There was excellent correlation between the software packages used for all measures including assessing the whole tumour, selective regions with lowest ADC, the change of ADC across the brain-tumour interface and the relation of the tumour ADC to peritumoural regions and the normal white matter. There was no significant inter- or intra-observer variability for repeated readings. There were significant differences in the mean values obtained using different methodologies and different metrics had differing relationships to overall survival and primary tumour of origin. CONCLUSION:Diffusion weighted MRI metrics offer promise as potential non-invasive biomarkers in brain metastases and a variety of metrics have been shown to be reliably measured using differing platforms and observers.
journal_name
Magn Reson Imagingjournal_title
Magnetic resonance imagingauthors
Zakaria R,Das K,Bhojak M,Radon M,Sluming V,Walker C,Jenkinson MDdoi
10.1016/j.mri.2013.12.010subject
Has Abstractpub_date
2014-04-01 00:00:00pages
291-6issue
3eissn
0730-725Xissn
1873-5894pii
S0730-725X(13)00416-5journal_volume
32pub_type
杂志文章abstract::Pulsed field gradient (PFG) nuclear magnetic resonance (NMR) and microimaging experiments have been performed to study the diffusion of liquid alkanes into a variety of semicrystalline polyethylene (PE) samples. The results highlight the importance of the crystalline phase in controlling the diffusion process in terms...
journal_title:Magnetic resonance imaging
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abstract::We present a novel approach to the nuclear magnetic resonance (NMR) and magnetic resonance imaging (MRI) analysis of complex samples with nontrivial distribution of longitudinal relaxation rate R(1). Parametrically enabled relaxation filters with double and multiple inversion (PERFIDI) aim to separate signals arising ...
journal_title:Magnetic resonance imaging
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journal_title:Magnetic resonance imaging
pub_type: 杂志文章
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journal_title:Magnetic resonance imaging
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journal_title:Magnetic resonance imaging
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pub_type: 临床试验,杂志文章
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journal_title:Magnetic resonance imaging
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更新日期:2012-12-01 00:00:00
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pub_type: 杂志文章
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更新日期:2008-10-01 00:00:00
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journal_title:Magnetic resonance imaging
pub_type: 杂志文章
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pub_type: 杂志文章
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journal_title:Magnetic resonance imaging
pub_type: 杂志文章
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更新日期:2007-11-01 00:00:00
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journal_title:Magnetic resonance imaging
pub_type: 杂志文章
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