A DTI pulse sequence with single shot diffusion-weighted echo planar imaging (TR/TE=3600/95 ms, FOV=24×24 cm, NEX=2, matrix=128×128, slice thickness=4.5 mm) was applied sequentially in 30 non-collinear directions b-value=1000 b-value=1000one s/mm withone diffuscan withoutng (b=0s/mm).
In this work, an artifact-free HARDI template of the human brain was developed from low angular resolution multiple-shot diffusion data.
The DTI datasets were acquired by using single-shot diffusion spin-echo, echo-planar imaging with a TR/TE of 15 800 millisecond/minimum, a 2.5 mm section, a matrix of 128 × 128, number of excitations of 3, and an FOV of 25.6 × 25.6 cm, yielding an in-plane resolution of 2 mm, with a total acquisition time of 12 min.
Diffusion-weighted images (DWIs) were acquired with a single-shot diffusion-weighted echo planar imaging sequence (TE/TR = 83/8700 ms, flip angle = 90°, image resolution 1.64 mm isotropic, b-value = 800 s/mm) in 30 diffusion-encoding directions and 1 non-diffusion-weighted b0-image.
All of these studies used single-shot EPI diffusion-weighted sequences.
For DTI, single-shot echo-planar diffusion tensor images were obtained (TR = 3725 ms; TE = 56 ms; flip angle = 90°, b = 800 s/mm²) with 15 different nonparallel directions (b = 800 sec/mm) and the baseline image without diffusion weighting (b = 0 sec/mm).
Scans were performed on a 3.0 T Magnetom Trio (Siemens, Erlangen, Germany) and a 12-channel head coil: T1-weighted scan by MPRAGE sequence (voxel size 1x1x1 mm); DW-MRI protocol had 60 single-shot echo-planar diffusion-weighted volumes at b = 700 s/mm and 10 scans at b ≈ 0 s/mm; field of view 256x256 mm; matrix size 128x128; slice thickness 2 mm.
The results showed that shot peening enhanced the nitrogen diffusion rate and led to a twice thicker nitrided layer than the un-shot peening samples under the same plasma nitriding conditions (410 °C, 4 h).
We use a diffusion weighted single shot EPI spin echo sequence with the following timing parameters: TR/TE/Δ/δ = 4200/89/43.5/32.5 ms, where Δ is the diffusion time interval and δ the diffusion gradient duration [28].
To investigate this point in more depth, we studied a similar peak detection paradigm applied to two simple stochastic models, one corresponding to LFPs arising from a linear summation of spikes arriving at the times of a Poisson process (a shot-noise process) and the diffusion limit of this phenomenon (an Ornstein Uhlenbeck process).
Methods Seventeen women with endometrial cancer (85% undergoing hysterectomy) were evaluated at 1.5 and 3 T using multiplanar T2-weighted, dynamic T1-weighted contrast enhanced and single shot echo-planar imaging (EPI) diffusion-weighted magnetic resonance imaging (MRI) (b=0, 50, 150, 500, 1000 s /mm ) for staging purposes.
