pre-saturation

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pre-saturation

A specialised MRI technique that uses repeated radio frequency excitation of structures adjacent to the region of interest to reduce or eliminate phase-effect artefacts.
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Imaging sequences included as shown in [Table 1]: (a) coronal oblique (parallel to the long axis of the sacrum) T1W-TSE with spectral presaturation with inversion recovery (SPIR), (b) coronal oblique T2-weighted (T2W) TSE, (c) STIR, and (d) DWI.
On MRI the characteristic appearances are multiple frond-like synovial proliferation of fat signal intensity and suppression of signal with fat selective presaturation.
6 ms; inversion delay spectral presaturation attenuated by inversion recovery (SPAIR) 90 ms; flip angle 10; FOV 360x360 [mm.
Presaturation of wood with water did not significantly impede the subsequent penetration of n-hexadecane, whereas the presaturation of wood with n-hexadecane led to a significant decrease of the subsequent water uptake.
MR imaging of the neck with fatty tissue reveals large irregular areas of T1 weighted hyperintensity that become hypointense on fat suppressed transverse spectral presaturation inversion recovery T1 weighted MR image.
1]H-NMR spectra were acquired using a NOESY pulse sequence for presaturation on water resonance and spoiled gradient during mixing time (noesygppr1d, Bruker terminology).
The subsynovial component has a high signal intensity on T1- and T2-weighted images and signal suppression on short T1 inversion recovery sequences (STIR) or after presaturation of the fat [10, 14, 24, 25].
05 mmol/Kg dose, presaturation of the baseline signal prior to the PWI acquisition was done to reduce T1effects as well as potential contrast leakage effects due to blood brain barrier disruption.
1]H NMR spectra were acquired at 300K using the Carr-Purcell-Meiboom-Gill (CPMG) spin-echo pulse sequence with presaturation, with a total spin-echo delay (2n[tau]) of 100 msec to attenuate broad signals from proteins and lipoproteins.