Methods Using a phase-contrast cine MRI pulse sequence, we measured brain motion and CSF flow during the cardiac cycle in 10 healthy volunteers and 10 patients with MRI-suspected arachnoid cyst or subarachnoid space enlargement. CSF stroke volume curve was illustrated according to flow quantification...
SpoilingSpoiled GRE pulse sequences can produce images with some T1-weighted contrast (Figure 14.4). These sequences go by a variety of names including spoiled Fast Low-Angle Shot (FLASH), spoiled gradient echo (SPGR), and T1 fast field echo (T1-FFE), as listed in Table 14.1. 扰相扰相...
52 A phase contrast MRI, (also known as “cine MRI,”) is an excellent sequence to demonstrate pulsatile CSF flow and CSF flow rates.53 Elevation of the aqueductal stroke volume (ASV) may be observed in these patients. This parameter frequently improves following a CSF shunting procedure and...
Introduction Phase contrast MRI is a non-invasive technique to assess cardiovascular blood flow. However, this technique is not accurate in cases where there is atherosclerotic disease and the blood flow is disturbed. Disturbed flow mainly can be seen at bifurcations, branch point, sharp bend and ...
Phase contrast (PC) magnetic resonance imaging with a three-dimensional, radially undersampled acquisition allows for the acquisition of high resolution angiograms and velocimetry in dramatically reduced scan times. However, such an acquisition is sensitive to blurring and artifacts from off-resonance and...
Why does it occur? How many Hz at 1.5 T? bywww.revisemri.com Abdominal MRI at 3.0 T: The Basics Revisited Wednesday, 20 July 2005bywww.ajronline.org MRI Resources Contrast Enhanced MRI-Education pool--Crystallography-Societies-Case Studies MR-TIP Community User Pass...
However, through pump-fluence dependent studies, the evidences of decoupling on the long-range scale between electronic and structural phases were demonstrated in the observation of a threshold for the onset of IMT to be ≤ 1 mJ/cm2 20,24, in distinct contrast to the onset fluence...
Comparison of 4D flow and 2D velocity-encoded phase contrast MRI sequences for the evaluation of aortic hemodynamics. Int J Cardiovasc Imaging. 2016;32:1529–41. Article Google Scholar Holland BJ, Printz BF, Lai WW. Baseline correction of phase-contrast images in congenital cardiovascular ...
Recently, a pulse scheme for heteronuclear spin decoupling in solid-state NMR, called swept-frequency two-pulse phase modulation (SWf-TPPM), was introduced which outperforms the standard TPPM and small phase incremental alteration (SPINAL) schemes. It has also been shown that the frequency-sweep ...
Quantitative contrast‐enhanced MRI with superparamagnetic nanoparticles using ultrashort time‐to‐echo pulse sequences Purpose Conventional MRI using contrast agents is semiquantitative because it is inherently sensitive to extravoxular susceptibility artifacts, field inhom... CA Gharagouzloo,PN Mcmahon,...