scholarly journals MR imaging of the normal meninges: comparison of contrast-enhancement patterns on 3D gradient-echo and spin-echo images.

1994 ◽  
Vol 162 (1) ◽  
pp. 131-135 ◽  
Author(s):  
J W Farn ◽  
S A Mirowitz
Keyword(s):  
Mr Imaging ◽  
Contrast Enhancement ◽  
Spin Echo ◽  
Gradient Echo

Experimental intracerebral and subarachnoid/intraventricular haemorrhages: MR detectability at 0.5 T and 1.5 T

2002 ◽  
Vol 43 (5) ◽  
pp. 464-473
Author(s):  
M. Alemany Ripoll ◽  
R. Raininko
Keyword(s):  
Cerebrospinal Fluid ◽  
Mr Imaging ◽  
Spin Echo ◽  
Autologous Blood ◽  
Pulse Sequences ◽  
Proton Density ◽  
Gradient Echo ◽  
The Brain ◽  
Formalin Fixed

Purpose: To compare the detectability of small experimental intracranial haemorrhages on MR imaging at 0.5 T and 1.5 T, from hyperacute to subacute stages. Material and Methods: 1 ml of autologous blood was injected into the brain of 15 rabbits to create intraparenchymal haematomas. Since the blood partially escaped into the cerebrospinal fluid (CSF) spaces, detectability of subarachnoid and intraventricular blood was also evaluated. MR imaging at 0.5 T and at 1.5 T was repeated up to 14 days, including T1-, proton density- and T2-weighted (w) spin-echo (SE), FLAIR and T2*-w gradient echo (GE) pulse sequences. The last MR investigation was compared to the formalin-fixed brain sections in 7 animals. Results: The intraparenchymal haematomas were best revealed with T2*-w GE sequences, with 100% of sensitivity at 1.5 T and 90–95% at 0.5 T. Blood in the CSF spaces was significantly ( p < 0.05) better detected at 1.5 T with T2*-w GE sequences and detected best during the first 2 days. The next most sensitive sequence for intracranial blood was FLAIR. SE sequences were rather insensitive. Conclusion: 1.5 T equipment is superior to 0.5 T in the detection of intracranial haemorrhages from acute to subacute stages. T2*-w GE sequences account for this result but other sequences are also needed for a complete examination.

Musculoskeletal MR imaging: turbo (fast) spin-echo versus conventional spin-echo and gradient-echo imaging at 0.5 tesla

1994 ◽  
Vol 23 (8) ◽  
pp. 607-610 ◽  
Author(s):  
M. Vahlensieck ◽  
Ph. Lang ◽  
K. Seelos ◽  
D. Yang-Ho Sze ◽  
S. Grampp ◽  
...  
Keyword(s):  
Mr Imaging ◽  
Spin Echo ◽  
Fast Spin Echo ◽  
Gradient Echo ◽  
Gradient Echo Imaging ◽  
Conventional Spin Echo ◽  
Fast Spin

Use of Gd-DTPA and fast gradient-echo and spin-echo MR imaging to demonstrate renal function in the rabbit.

Radiology ◽  
1989 ◽  
Vol 170 (3) ◽  
pp. 705-711 ◽  
Author(s):  
M J Carvlin ◽  
P H Arger ◽  
H L Kundel ◽  
L Axel ◽  
L Dougherty ◽  
...  
Keyword(s):  
Renal Function ◽  
Mr Imaging ◽  
Spin Echo ◽  
Gradient Echo ◽  
Fast Gradient

scholarly journals Intraoperative magnetic resonance imaging findings during deep brain stimulation surgery

2011 ◽  
Vol 115 (4) ◽  
pp. 852-857 ◽  
Author(s):  
Olivia O. Huston ◽  
Robert E. Watson ◽  
Matt A. Bernstein ◽  
Kiaran P. McGee ◽  
S. Matt Stead ◽  
...  
Keyword(s):  
Deep Brain Stimulation ◽  
Mr Imaging ◽  
Brain Stimulation ◽  
Spin Echo ◽  
Fast Spin Echo ◽  
Brain Shift ◽  
Gradient Echo ◽  
Acute Hemorrhage ◽  
Compulsive Disorder ◽  
Deep Brain

Object Deep brain stimulation (DBS) is an established neurosurgical technique used to treat a variety of neurological disorders, including Parkinson disease, essential tremor, dystonia, epilepsy, depression, and obsessive-compulsive disorder. This study reports on the use of intraoperative MR imaging during DBS surgery to evaluate acute hemorrhage, intracranial air, brain shift, and accuracy of lead placement. Methods During a 46-month period, 143 patients underwent 152 DBS surgeries including 289 lead placements utilizing intraoperative 1.5-T MR imaging. Imaging was supervised by an MR imaging physicist to maintain the specific absorption rate below the required level of 0.1 W/kg and always included T1 magnetization-prepared rapid gradient echo and T2* gradient echo sequences with selected use of T2 fluid attenuated inversion recovery (FLAIR) and T2 fast spin echo (FSE). Retrospective review of the intraoperative MR imaging examinations was performed to quantify the amount of hemorrhage and the amount of air introduced during the DBS surgery. Results Intraoperative MR imaging revealed 5 subdural hematomas, 3 subarachnoid hemorrhages, and 1 intraparenchymal hemorrhage in 9 of the 143 patients. Only 1 patient experiencing a subarachnoid hemorrhage developed clinically apparent symptoms, which included transient severe headache and mild confusion. Brain shift due to intracranial air was identified in 144 separate instances. Conclusions Intraoperative MR imaging can be safely performed and may assist in demonstrating acute changes involving intracranial hemorrhage and air during DBS surgery. These findings are rarely clinically significant and typically resolve prior to follow-up imaging. Selective use of T2 FLAIR and T2 FSE imaging can confirm the presence of hemorrhage or air and preclude the need for CT examinations.

Experimental hyaline cartilage lesions: Two-dimensional spin-echo versus three-dimensional gradient-echo MR imaging

1991 ◽  
Vol 1 (6) ◽  
pp. 665-672 ◽  
Author(s):  
Gerhard Adam ◽  
Claus Nolte-Ernsting ◽  
Andreas Prescher ◽  
Markus Bühne ◽  
Kira Bruchmüller ◽  
...  
Keyword(s):  
Mr Imaging ◽  
Hyaline Cartilage ◽  
Spin Echo ◽  
Three Dimensional ◽  
Two Dimensional ◽  
Gradient Echo ◽  
Cartilage Lesions

Left ventricular thrombi: evaluation with spin-echo and gradient-echo MR imaging.

Radiology ◽  
1992 ◽  
Vol 182 (1) ◽  
pp. 225-229 ◽  
Author(s):  
M Jungehülsing ◽  
U Sechtem ◽  
P Theissen ◽  
H H Hilger ◽  
H Schicha
Keyword(s):  
Mr Imaging ◽  
Spin Echo ◽  
Left Ventricular ◽  
Gradient Echo ◽  
Left Ventricular Thrombi

Crohn Disease with Endoscopic Correlation: Single-Shot Fast Spin-Echo and Gadolinium-enhanced Fat-suppressed Spoiled Gradient-Echo MR Imaging

Radiology ◽  
2002 ◽  
Vol 222 (3) ◽  
pp. 652-660 ◽  
Author(s):  
Russell N. Low ◽  
Christopher P. Sebrechts ◽  
Douglas A. Politoske ◽  
Michael T. Bennett ◽  
Sergio Flores ◽  
...  
Keyword(s):  
Mr Imaging ◽  
Crohn Disease ◽  
Spin Echo ◽  
Fast Spin Echo ◽  
Single Shot ◽  
Gradient Echo ◽  
Endoscopic Correlation ◽  
Fast Spin ◽  
Spoiled Gradient Echo

Intracranial hemorrhage: gradient-echo MR imaging at 1.5 T. Comparison with spin-echo imaging and clinical applications.

Radiology ◽  
1988 ◽  
Vol 168 (3) ◽  
pp. 803-807 ◽  
Author(s):  
S W Atlas ◽  
A S Mark ◽  
R I Grossman ◽  
J M Gomori
Keyword(s):  
Mr Imaging ◽  
Intracranial Hemorrhage ◽  
Spin Echo ◽  
Clinical Applications ◽  
Gradient Echo

Focal nodular hyperplasia of the liver on ferumoxides-enhanced MR imaging: features on conventional spin-echo, fast spin-echo and gradient-echo pulse sequences

1999 ◽  
Vol 9 (8) ◽  
pp. 1535-1542 ◽  
Author(s):  
S. Precetti-Morel ◽  
M. F. Bellin ◽  
L. Ghebontni ◽  
S. Zaïm ◽  
P. Opolon ◽  
...  
Keyword(s):  
Mr Imaging ◽  
Spin Echo ◽  
Pulse Sequences ◽  
Fast Spin Echo ◽  
Imaging Features ◽  
Gradient Echo ◽  
Nodular Hyperplasia ◽  
Echo Pulse ◽  
Conventional Spin Echo ◽  
Fast Spin
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