Article Figures & Data
Figures
- fig 1.
Images of a 35-year-old male volunteer.
A, Axial 4-GRASE b0 image, 4615/119/4 (TR/TEeff/excitations), obtained at the level of the temporal lobe base.
B, Single-shot spin-echo echo-planar b0 image, 5538/96/4, obtained at the level of the temporal lobe base.
C, Thresholded binary image generated from single-shot spin-echo echo-planar b0 image.
D, Difference image obtained by subtracting the binary maps of the 4-GRASE b0 images from the binary map of the T1-weighted spin-echo image.
E, Difference image obtained by subtracting the binary maps of the single-shot spin-echo echo-planar b0 images from the binary map of the T1-weighted spin-echo image. Note that the distortion index (number of pixels in the black zone) is greater for the subtracted image E than D, which is the result of more severe distortion in the single-shot spin-echo echo-planar b0 images, as shown by thick bands of signal loss (*) and signal hyperintensity (arrows).
- fig 1.
fig2.Images of a 34-year-old male volunteer.
A, Axial single-shot spin-echo echo-planar 3429/96/4 MR image, obtained at the level of the basal ganglia. The single-shot spin-echo echo-planar diffusion-weighted MR image and the corresponding maps (B, C) show a greater degree of distortion of the frontal lobes around the frontal sinuses and a higher SNR than do the 4-GRASE diffusion-weighted MR image and maps (D, E, F).
B, Corresponding ADCi map.
C, Corresponding FA map.
D, 4-GRASE 4286/119/4 diffusion-weighted image, obtained at the level of the basal ganglia.
E, Corresponding ADCi map.
F, Corresponding FA map.
- fig 3.
Images of a 34-year-old male volunteer (same volunteer as in fig 2).
A, Axial 4-GRASE 4286/119/4 image, obtained at the level of the lateral ventricle body.
B, Corresponding ADCi map.
C, Corresponding FA map.
D, 10-GRASE 4286/119/10 diffusion-weighted MR image, obtained at the level of the lateral ventricle body. As expected, the 10-GRASE diffusion-weighted MR image and maps (D, E, F) show higher SNR than the 4-GRASE diffusion-weighted MR image and maps (A, B, C) at the expense of longer acquisition time.
E, Corresponding ADCi map.
F, Corresponding FA map.
Tables
Averages and standard deviations (SDs) of ADCi (10−5 mm2/sec) and FA values for the different brain anatomic locations
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