echo sequences
Comparison of dynamic contrast enhanced gradient echo and spin echo sequences in MR of head and neck neoplasms
... gradient- echo sequences did not significantly degrade image quality, and sections were obtained to minimize this ...gradient-echo sequences (2 to 4 millisec- onds), susceptibility artifacts ...
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Hyperecho Turbo Spin Echo Sequences at 3T: Clinical Application in Neuroradiology
... refocusing flip angles are used so that high flip angles produce a high signal for the encoding of the central k-space, and lower flip angles are applied for the acquisition of outer parts of the k-space. Asymmetric ...
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MR Imaging of Parkinson Disease with Spin Echo and Gradient Echo Sequences
... TABLE 3: Restoration of the Signal Intensities [4] of the Substantia Nigra in Parkinson and Control Patients on Spin-Echo and Gradient-Echo Sequences Sequence: Signal Intensity Spin-echo[r] ...
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MR of the head and neck: comparison of fast spin echo and conventional spin echo sequences
... When compared with conventional spin-echo sequences, fast spinecho sequences provided improved or equal lesion conspicuousness in a majority of head and neck lesions Table 1 and did not [r] ...
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Fast spin echo and fast fluid attenuated inversion recovery versus conventional spin echo sequences for MR quantification of multiple sclerosis lesions
... FLAIR sequences, could be considered more representative of the clinical status and probably more closely related to clinical disabil- ...long echo time used in this sequence, which could be responsible for ...
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MR evaluation of vertebral metastases: T1 weighted, short inversion time inversion recovery, fast spin echo, and inversion recovery fast spin echo sequences
... An intriguing problem that developed during the study was the fall in percent of contrast and contrast-to-noise ratio of STIR in group 3. The study population in group 1 was not signifi- cantly different from subgroups 2 ...
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Susceptibility Weighted Imaging for the Evaluation of Patients with Familial Cerebral Cavernous Malformations: A Comparison with T2 Weighted Fast Spin Echo and Gradient Echo Sequences
... different sequences were compared in the same planes and indepen- dently evaluated by 2 experienced ...3 sequences was not exactly the same, the SWI sequence was reconstructed with the MinMIP technique to ...
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Confounding Effect of Large Vessels on MR Perfusion Images Analyzed with Independent Component Analysis
... is limited because of the high temporal sampling rate. Low spatial resolution results in partial volume ef- fects where an image voxel contains both brain pa- renchyma and a large blood vessel. Because of partial volume ...
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Head and Neck Paragangliomas: Improved Tumor Detection Using Contrast Enhanced 3D Time of Flight MR Angiography As Compared with Fat Suppressed MR Imaging Techniques
... imaging sequences lack a high enough sensitivity to detect ...of sequences to investigate head and neck lesions have become ...spin-echo sequences, T1-weighted spin-echo and T2- ...
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Comparison of spin echo MR pulse sequences for imaging of the brain
... spin-echo sequences display fat much brighter than conventional spin-echo techniques do (19 –21) (Fig ...spin- echo experiment, many fat spins fail to be refo- cused, resulting in intermediate ...
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Pseudoatrophy of the cervical portion of the spinal cord on MR images: a manifestation of the truncation artifact?
... During routine evaluation of MR images of the cervical spine obtained with either conventional spin-echo or 3D Fourier transformation 30FT gradient-echo sequences in which CSF was hyperi[r] ...
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Detection of Intracranial Hemorrhage: Comparison between Gradient echo Images and b0 Images Obtained from Diffusion weighted Echo planar Sequences
... is also less sensitive than GRE. In particular, GRE detects the small punctate hemorrhages and linear staining in the cerebral cortex seen in cerebral am- yloid angiopathy or hypertensive vasculopathy (16–19), disorders ...
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Comparison of MR pulse sequences in the detection of multiple sclerosis lesions
... spin-echo sequences, the number of lesions seen on both sequences was very similar ...spin-echo sequences, which was higher than that used for conventional spin-echo ...
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MR imaging of hyperacute intracranial hemorrhage in the cat
... In our study, the gradient-echo sequences showed zones of hypointense signal in the region of the hematoma in all five cats regardless of the Hb saturation in the sample.. This group inc[r] ...
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Fast spin echo MR in the detection of vertebral metastases: comparison of three sequences
... PURPOSE: To examine the relative capabilities for the detection of vertebral metastases of three available fast spin-echo sequences: T ]-weighted fast spin-echo, short tau inversion reco[r] ...
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Adult cerebrovascular disease: role of modified rapid fluid attenuated inversion recovery sequences
... (RARE) sequences and other fast spin-echo sequences, with improved scan time efficiency; a long inversion delay (1900 milliseconds), allowing interleaving of inversion pulses and echo trains ...
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Emerging Patterns of Diffusion Weighted MR Imaging in Creutzfeldt Jakob Disease: Case Report and Review of the Literature
... gradient-echo sequences) may show abnormalities in the basal ganglia and cerebral cortex; however, 21% of patients with sporadic CJD have normal MR imaging findings ...
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Sagittal MR of multiple sclerosis in the spinal cord: fast versus conventional spin echo imaging
... Apart from differences in detecting subtle spinal cord abnormalities in some patients, the two se- quences performed almost equally well, in keeping with findings from a previous study (1), which also used ...
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T1 Signal Intensity Increase in the Dentate Nucleus after Multiple Exposures to Gadodiamide: Intraindividual Comparison between 2 Commonly Used Sequences
... ms; echo-train length, 1; section thickness, 5 mm; spacing, 1 mm; matrix size, 256 ⫻ 256; and FOV, 165 ⫻ 220) and a T1-weighted 3D MPRAGE sequence (TR, 1740 ms; TE, ...
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Segmented three dimensional echo planar flow imaging of the cervical carotid arteries
... segmented echo-planar flow studies consis- tently underestimated the dimension of both large (common carotid) and small (vertebral) arteries on both the original and MIP images (Tables 2 and ...segmented ...
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