fat saturation

fat saturation

A specialised MRI technique which selectively saturates fat protons before acquiring data, as in standard sequences, to reduce fat signal. The pre-saturation pulse is applied before each slice selection. Fat saturation requires a homogeneous magnetic field and precise frequency calibration.
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Axial MR images of the left wrist with T1-weighting and T2-weighting with fat saturation (Figure 1) show a large, infiltrative lesion located deep to the distal carpal tunnel.
However, if frequency-selective fat saturation techniques are used, variations of the regional magnetic field surrounding the seton may create an inhomogeneous magnetic field, with resultant areas of suboptimal fat saturation.
The fat saturation technique, which is routinely used for the T2-weighted images of the modern head and neck MRI, may exaggerate this discrepancy for NIPTs, because the intervening fat involved by the infiltrative lesion can simulate normal adipose tissue whose signal becomes suppressed with fat saturation.
MR (Figure 1B) axial proton density with fat saturation demonstrates edema of the os peroneum as the sesamoid courses within the peroneus longus tendon.
MRI of the leg showed, on T2-weighted cross-sectional fat saturation sequences, a hyperintense signal on both the lateral aspect of the periosteum and lateral part of the tibial diaphysis at the level of the ossification (Figure 3).
A cervical spine MRI obtained for cervical radiculopathy symptoms partially included the mass, which was heterogeneous, hyperintense to muscle on both T1 andT2weightedsequences with afew internal flowvoids, and showed moderate loss of signal with fat saturation (Figure 3).
An unenhanced MR of the pelvis was obtained, using axial and coronal T1 spin echo, and axial and sagittal T2 fat saturation fast spin echo sequences (Figures 2A, 2B).
On PD fat saturated images, there was a thin uniform capsule with incomplete fat saturation (Fig.
Fat saturation sequences using STIR or saturation bands enables a narrowing down of the differential diagnosis.
The following sequences were done; T1W TSE(TE = 18, TR = 520) in axial and sagittal planes, T2W TSE(TE = 104, TR = 4080) in axial plane, STIR(TI = 130, TR = 5000) in sagittal plane, T2W TSE(TE = 57, TR = 4470) in sagittal plane with fat saturation and post gadolinium T1W TSE(TE = 18, TR = 520) in axial and sagittal planes, using Siemens Sonata 1.
A sagittal or axial 2-D, T2-weighted, fast-spin echo, fast-recovery sequence with fat saturation.
Oldick BS, Firkins JL (2000) Effects of degree of fat saturation on fiber digestion and microbial protein synthesis when diets are fed twelve rimes daily.