期刊
JOURNAL OF MAGNETIC RESONANCE IMAGING
卷 31, 期 6, 页码 1346-1354出版社
WILEY
DOI: 10.1002/jmri.22201
关键词
iron; phase imaging; x-ray fluorescence; susceptibility weighted imaging; human
资金
- Natural Sciences and Engineering Research Council of Canada [CHRPJ313008-2005]
- Saskatchewan Health Research Foundation Research Group Facilitation (SHRF) [1639, RPP ROP-58837]
- Canadian Foundation for Innovation and Canadian Institutes for Health Research (CIHR) [ROP-58337]
- NHLBI [62983-04]
- Department of Energy, Office of Biological and Environmental Research
- National Institutes of Health, National Center for Research Resources
Purpose: To test the ability of susceptibility weighted images (SWI) and high pass filtered phase images to localize and quantify brain iron. Materials and Methods: Magnetic resonance (MR) images of human cadaver brain hemispheres were collected using a gradient echo based SWI sequence at 1.5T. For X-ray fluorescence (XRF) mapping, each brain was cut to obtain slices that reasonably matched the MR images and iron was mapped at the iron K-edge at 50 or 100 pm resolution. Iron was quantified using XRF calibration foils. Phase and iron XRF were averaged within anatomic regions of one slice, chosen for its range of iron concentrations and nearly perfect anatomic correspondence. X-ray absorption spectroscopy (XAS) was used to determine if the chemical form of iron was different in regions with poorer correspondence between iron and phase. Results: Iron XRF maps, SWI, and high pass filtered phase data in nine brain slices from five subjects were visually very similar, particularly in high iron regions. The chemical form of iron could not explain poor matches. The correlation between the concentration of iron and phase in the cadaver brain was estimated as c(Fe) [mu g/g tissue] = 850 Delta phi + 110. Conclusion: The phase shift Delta phi was found to vary linearly with iron concentration with the best correspondence found in regions with high iron content.
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