MR imaging of Parkinson disease with spin-echo and gradient-echo sequences
نویسندگان
چکیده
منابع مشابه
The diagnosis of herniated intervertebral disks with MR imaging: a comparison of gradient-refocused-echo and spin-echo pulse sequences.
Axial MR images of 65 lumbar disks with herniated nucleus pulposus imaged by gradient-refocused-echo (GRE) and spin-echo (SE) MR pulse sequences of 200-400/15 with a flip angle of 15-30 degrees was selected as optimal because of its high signal-to-noise ratio and good contrast between CSF, nucleus pulposus, and bone. The GRE technique was confirmed to be more sensitive in detecting prolapsed di...
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We read with interest the two recent articles (1, 2) concerning the comparison of lesion enhancement between spin-echo and gradient-echo magnetic resonance scans. Although they both conclude that minimally enhancing lesions may be missed by a gradient-echo technique, one paper (1) seems to overstate dramatically the theoretical reasons for the clinically observed difference. The authors demonst...
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BACKGROUND AND PURPOSE The different sensitivities to vessel size of gradient-echo echo-planar imaging (GE-EPI) and spin-echo EPI (SE-EPI) might indicate the relative cerebral blood volumes (rCBVs) of different tumor sizes. The techniques of GE-EPI and SE-EPI were compared for detecting low- versus high-grade gliomas. METHODS Six patients with low-grade gliomas and 19 patients with high-grade...
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A detailed evaluation of the MR appearance of the pituitary gland-cavernous sinus junction has not been described. In a series of coronal T1-weighted spin echo images without and with IV gadolinium, we noted the variable size and signal intensity of cavernous venous spaces adjacent to the pituitary gland and the inconsistent visualization of the dural membrane just lateral to the gland. Correla...
متن کاملcomparison of maximum signal intensity of magnevist contrast agent in modified t1 weighted spin echo, t1 weighted fast spin echo and t1 weighted gradient echo sequences
background: nowadays mri examinations have been widely used in clinical applications for many diagnoses. the use of contrast agent in mri improves lesion detection and characterization and causes more accurate diagnosis. objectives: the aim of this study was comparing to optimal dose of magnevist contrast agent in modified t1w se (spin echo), t1w fse (fast spin echo) and t1w gre (gradient ech...
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ژورنال
عنوان ژورنال: American Journal of Roentgenology
سال: 1989
ISSN: 0361-803X,1546-3141
DOI: 10.2214/ajr.152.1.159