Flip angle
Intracranial stenoocclusive disease: MR angiography with magnetization transfer and variable flip angle
... variable flip angle radio-frequency pulse varied the slab excitation linearly from 10 8 to 30 8 ...effective flip angle at the center of the slab was 20 8 (nominal flip ...
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K-space filter deconvolution and flip angle self-calibration in 2D radial hyperpolarised 3He lung MRI
... constant flip angles the transverse magnetisation decays with each RF excitation, imposing a k-space filter on the acquired ...average flip angle per slice was calculated from this signal decay, and ...
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Enhancing Gray to White Matter Contrast in 3T T1 Spin Echo Brain Scans by Optimizing Flip Angle
... a flip angle of 50°, but this effect was less pronounced than theoretically pre- dicted, probably because of more uniform signal in- tensity distribution at lower flip ...Moreover, flip ...
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Preliminary clinical results with low flip angle spin echo MR imaging of the head and neck
... In preliminary studies with a human volunteer and five patients with various diseases of the head and neck, conventional long TR, long TE and short TR, short TE images were compared with[r] ...
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MR Evaluation of Large Intracranial Aneurysms Using Cine Low Flip Angle Gradient Refocused Imaging
... Similar low signal intensity of the balloon was also seen on cine MR; however, high-signal flowing blood was readily identified adjacent to the balloon in either the patent lumen of the [r] ...
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... the flip angle. Full 3D maps of the flip angle were created of slabs excited using the three RF pulses described ...measured flip angle in the centre of the slab, and a smoothed ...
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ESGAR 2011 Book of Abstracts
... (EOB)-enhanced MRI using a high flip angle (FA) improves focal liver lesion (FLL) detection compared to using a standard low FA... Results: For both readers, the Az values w[r] ...
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Identification of the feeding arteries of spinal vascular lesions via phase contrast MR angiography with three dimensional acquisition and phase display
... MR angiography included sagittal 5-mm-thick T1- weighted spin-echo sequences (360 –500/20 –25/2– 4 [repetition time/echo time/excitations]) with a 25-cm field of view and a 160 3 224 matrix. Since paramagnetic contrast ...
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Novel MRI tests of orocecal transit time and whole gut transit time: studies in normal subjects
... FA, flip angle; FFE, fast field echo; FGIDs, functional gastrointestinal disorders; FOV, field of view; ICC, intraclass correlation coefficient; IQR, inter-quartile range; LUBT, Lactose Ureide breath test; ...
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Pediatric cardiovascular interventional devices: effect on CMR images at 1 5 and 3 Tesla
... The results of our study suggest the strength of the magnetic field, device composition, sequence type and orientation of the device in B0 have the largest impact on the amplification factor of implanted devices in an MR ...
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Optimization of sequence parameters in fast MR imaging of the brain with FLASH
... The behavior of graywhite matter contrast with a small flip angle of 30° and a short TE of 10, as a function of TR, is different from GRASS 4]: the T1 effect is present for very short TR[r] ...
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Vascular tortuosity in relationship with hypertension and posterior fossa volume in hemifacial spasm
... All subjects underwent a standardized MRI protocol as previously described [3, 4, 10, 14]. This included the 3- dimensional constructive interference at steady state (CISS) sequence focused over the posterior fossa ...
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NMR Imaging of low pressure, gas phase transport in packed beds using hyperpolarized xenon 129
... Image acquisition was obtained through a variable flip angle VFA gradient echo scheme.23 The MR images were collected either at the resonance frequency of the bulk gas phase referenced t[r] ...
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Flow sensitive MR imaging of ventriculoperitoneal shunts: in vitro findings, clinical applications, and pitfalls
... 4.-0blique coronal image 130/11/2, with goo flip angle through intracranial segment arrow of a high-pressure shunt system in a patient with clinical findings suggesting shunt malfunction[r] ...
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The value of fast gradient echo MR sequences in the evaluation of brain disease
... One hundred fifteen patients thought to have intracranial disease were studied with various two-dimensional short repetition time, partial-flip-angle gradient-echo techniques: at 1.0 T, [r] ...
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Registration and tracking to integrate X-ray and MR images in an XMR facility
... TR ms, TE ms, flip angle ). The table top was then docked to the X-ray system, and five pairs of tracked X-ray images were acquired. Each pair of images simulated the approximately orthogonal views ...
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The diagnosis of herniated intervertebral disks with MR imaging: a comparison of gradient refocused echo and spin echo pulse sequences
... The GRE pulse sequence of 200-400/ 15 TRJTE with a flip angle of 15-30° was selected as optimal because of its high signal-to-noise ratio and good contrast between CSF, nucleus pulposus,[r] ...
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Magnetic resonance imaging in children: common problems and possible solutions for lung and airways imaging
... high flip angle settings (>30°) using a very short repetition time, so enhancing tissues in the lung with more water-like behavior, such as mucus plugs in the airways, have high signal intensities ...
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Fast Acquisition and Reconstruction Techniques in MRI
... MRF flip angle used in the acquisition plays an impor- tant role in this ...or flip angle pattern is not sensitive to a certain parameter, then this parameter can not be accurately decoded in ...
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Quiet T1 Weighted Pointwise Encoding Time Reduction with Radial Acquisition for Assessing Myelination in the Pediatric Brain
... flip angle FLASH sequences with the following parameters: In this study, we therefore aimed to compare the measureTR/TE ⫽ 10/1.37 ms; double flip angle ⫽ 3°, 19°; FOV ⫽ 230 mm; ments of [r] ...
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