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Technical Note: DTI measurements of fractional anisotropy and mean diffusivity at 1.5 T: Comparison of two radiofrequency head coils with different functional designs and sensitivities
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10.1118/1.3592013
/content/aapm/journal/medphys/38/6/10.1118/1.3592013
http://aip.metastore.ingenta.com/content/aapm/journal/medphys/38/6/10.1118/1.3592013
View: Figures

Figures

Image of FIG. 1.
FIG. 1.

Reference map of FA obtained by averaging FA maps of all subjects after normalization to standard space.

Image of FIG. 2.
FIG. 2.

Diffusion tensor estimation carried out using the LLS method. Mean value of FA (a) and MD (b) within ROIs placed in different anatomical regions (SCC, IC, CP, MCP, GP, TH, CA, PU). The bar charts depict the mean ± standard deviation across subjects for the standard quadrature head coil (coil-A) and eight-channel array head coil (coil-B). (**) and (*) indicate significant difference (p cor < 0.05) and trend of variation (p uncor < 0.05), respectively.

Image of FIG. 3.
FIG. 3.

Diffusion tensor estimation carried out using the LLS method. Standard deviation of FA (a) and MD (b) values within ROIs placed in different anatomical regions (SCC, IC, CP, MCP, GP, TH, CA, PU). The bar charts depict the mean ± standard deviation across subjects for the standard quadrature head coil (coil-A) and eight-channel array head coil (coil-B). (**) and (*) indicate significant difference (p cor < 0.05) and trend of variation (p uncor < 0.05), respectively.

Image of FIG. 4.
FIG. 4.

Diffusion tensor estimation carried out using the NLLS method. Mean value of FA (a) and MD (b) within ROIs placed in different anatomical regions (SCC, IC, CP, MCP, GP, TH, CA, PU). The bar charts depict the mean ± standard deviation across subjects for the standard quadrature head coil (coil-A) and eight-channel array head coil (coil-B). (**) and (*) indicate significant difference (p cor < 0.05) and trend of variation (p uncor < 0.05), respectively.

Image of FIG. 5.
FIG. 5.

Diffusion tensor estimation carried out using the NLLS method. Standard deviation of FA (a) and MD (b) values within ROIs placed in different anatomical regions (SCC, IC, CP, MCP, GP, TH, CA, PU). The bar charts depict the mean ± standard deviation across subjects for the standard quadrature head coil (coil-A) and eight-channel array head coil (coil-B). (**) and (*) indicate significant difference (p cor < 0.05) and trend of variation (p uncor < 0.05), respectively.

Image of FIG. 6.
FIG. 6.

SNR maps of the central slice (matrix 256 × 256) of the acquired phantom volume for the standard quadrature birdcage head coil (a) and eight-channel array head coil (b). The standard quadrature birdcage head coil shows a radial homogeneity of SNR values. The eight-channel array head coil is characterized by increased SNR values at the periphery, in proximity of the active elements of the RF coil.

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/content/aapm/journal/medphys/38/6/10.1118/1.3592013
2011-05-31
2014-04-18
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752b84549af89a08dbdd7fdb8b9568b5 journal.articlezxybnytfddd
Scitation: Technical Note: DTI measurements of fractional anisotropy and mean diffusivity at 1.5 T: Comparison of two radiofrequency head coils with different functional designs and sensitivities
http://aip.metastore.ingenta.com/content/aapm/journal/medphys/38/6/10.1118/1.3592013
10.1118/1.3592013
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