Brain iron detected by SWI high pass filtered phase calibrated with synchrotron X-ray fluorescence.
Brain iron detected by SWI high pass filtered phase calibrated with synchrotron X-ray fluorescence.
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DOI：
10.1002/jmri.22201
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发表时间：
2010-06
影响因子：
4.4
通讯作者：
Nichol, Helen
中科院分区：
文献类型：
--
作者：
Hopp, Karla;Popescu, Bogdan F. Gh;McCrea, Richard P. E.;Harder, Sheri L.;Robinson, Christopher A.;Haacke, Mark E.;Rajput, Ali H.;Rajput, Alex;Nichol, Helen
To test the ability of susceptibility weighted images (SWI) and high pass filtered phase images to localize and quantify brain iron. 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 μm 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. 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 cFe [μg/g tissue] = 850Δφ + 110. The phase shift Δφ was found to vary linearly with iron concentration with the best correspondence found in regions with high iron content.
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