proton density

proton density

a measure of proton concentration, or the number of atomic nuclei per given volume. It is one of the major determinants of magnetic resonance signal strength in hydrogen imaging.

proton density

An MRI term for the concentration of mobile hydrogen atoms within a sample of tissue.
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From the sagittal position, there was a cortically based lesion with clear osseous margin at the posterior part of tibia with a mixed high signal on proton density (PD) sequence and a low signal on T1WI at the front of it [Figure 1]c.
All patients in the study were diagnosed with NASH and liver fibrosis stages F1 through F3 based on biopsy, or by magnetic resonance elastography (MRE) and MRI proton density fat fraction (MRI-PDFF).
The standard imaging protocol included axial and sagittal images T2 weighted images (TR/TE=3580/88) without fat saturation, sagittal proton density image (TR/TE=3580/15) without fat saturation, coronal T2-weighted fat saturated image (TR/TE=5480/31) and 3-D gradient echo sequence (for cartilage).
Eighty-two patients with biopsy-confirmed non-alcoholic steatohepatitis were enrolled, all of whom had a minimum NAFLD activity score (NAS) more than 4 (with at least one point in each component), Stage 1-3 fibrosis and more than 8% absolute liver fat content by magnetic resonance imaging-estimated proton density fat fraction (MRI-PDFF).
In silicon-34, the central proton density is about half that of a comparable nucleus, the scientists calculated, after taking into account other central orbitals that contain normal numbers of protons.
MR (Figure 1B) axial proton density with fat saturation demonstrates edema of the os peroneum as the sesamoid courses within the peroneus longus tendon.
5T or 3T MR scanner (Siemens Medical) with the following sequences: oblique coronal Turbo Spin Echo (TSE) proton density (3 mm, TR range/TE range, 2100-2500/25-35) and fat suppressed T2W (3 mm, TR range/TE range 35004000/55-60); oblique sagittal T1W (3 mm, TR range/TE range 450-600/12-15) and fat suppressed T2W (3 mm, TR range/TE range, 3500-4000/55-65); and axial fat suppressed proton density (3 mm, TR range/TE range, 2100-2500/2537).
b) Corresponding proton density weighted fat suppressed sagittal MRI sequence showing the large anteromedial BML (green arrow).
The measured proton density across each depth profile for each TPC suggests differences in polymer chain packing and/or chemical composition.
3 is a sagittal proton density (PD) fat-saturated image of the right knee.
Don't just rely on the sagittal T2, but try variations like proton density or Short Tau Inversion Recovery (STIR).