Evaluation of Intracranial Tumor Resection: Intraoperative Low-Field MRI versus High-Field MRI

2013 ◽  
Vol 80 (5) ◽  
pp. 658
Author(s):  
G. Kus ◽  
P. David ◽  
O. De Witte
Keyword(s):  
High Field ◽  
Tumor Resection ◽  
Intracranial Tumor ◽  
High Field Mri ◽  
Low Field ◽  
Low Field Mri

scholarly journals Particularities in differential diagnostics of epileptogenic brain malformations on the low-field MRI-device

2019 ◽  
Vol 13 (4) ◽  
pp. 23-39
Author(s):  
V. S. Khalilov ◽  
A. A. Kholin ◽  
B. R. Bakaeva ◽  
M. Yu. Bobylova ◽  
Kh. Sh. Gazdieva
Keyword(s):  
High Field ◽  
Focal Epilepsy ◽  
Focal Cortical Dysplasia ◽  
Cortical Dysplasia ◽  
Differential Diagnostics ◽  
High Field Mri ◽  
Low Field ◽  
Brain Malformations ◽  
Low Field Mri

Background.It has been suggested that the part of the cryptogenic epilepsies is a consequence of minor-foci disorders of cortical architectonics, the diagnosis of which is not always possible due to the unavailability of MR-scanners with high magnetic induction.Objective:determination of the best options of the low-field MRI-device for visualization of epileptogenic brain malformations in children with symptomatic focal forms of epilepsy.Materials and methods.Were analyzed MRI data of 24 children undergoing investigations regarding for difficult-to-treat or pharmacoresistant forms of focal epilepsy in the Department of Magnetic-Resonance Tomography, Central Children Clinical Hospital of FMB Agency  of Russia at 2015–2017. All the patients underwent brain MRI according to standard routine protocol. Simultaneously we review conclusions of epileptologist and the preliminary video-electroencefalographic monitoring data for determination of the optimal imaging protocol for every specific form of epilepsy. For imaging of the epileptogenic brain lesion the MRI study was conducted on open-ended device “Aperto” (Hitachi Ltd., Japan) of static magnetic field with the tension characteristics of 0.4 T. The thickness of the slices and the scan step was performed  at 3.0 and 3.5 mm (the maximum value of slice thickness and step due to the technical conditions of the used scanner without losing in signalto-noise ratio) with the use of special positioning of slices in the coronal and axial projections, T2, T1, STIR, FLAIR weighted images perpendicular and parallel to the long axis of the hippocampus.Results and conclusion.In 24 patients were revealed structural brain changes that have neuroradiological signs of brain malformations. In all the patients this changes were associated with difficult to treat and drug-resistant forms of focal epilepsy. The newly identified malformations were observed in 10 patients, and in 3 cases the changes detected after previous MRI (including high-field MRI-devices) whose results were false-negative. In 11 patients diffuse brain abnormalities had been revealed, including the combinations of several hypogenesis and dysplastic pathologies. In 13 patients were marked different types of hemispheric and regional disorders of cortical development including focal cortical dysplasia. Extensive unilateral and bilateral changes were clearly distinguishable on the routine MRI. The low-tension technique approximated to the epileptic scanning protocol in some cases allowed to assess the affected area and revealed the combination of different variants of pathological cortical organization. In 7 cases the preliminary diagnosis based on the results of previous MRI studies including high-field MRI-devices. In 2 of these patients this changes were minor-focal, not visualized according to the routine MRI protocol, and had the differentiation characteristics between focal cortical dysplasia IIb/dysembryoplastic neuroepithelial tumor/ganglioglioma types. Disappointing results of visualization of mesial-basal temporal lobe regions aimed to detect small-caliber intracortical formations were observed. These patients contained a separate group of 12 children for whom extensive investigation which includes high-field MRI scan protocol on epileptic program was recommended.

scholarly journals Low-field MRI can be more sensitive than high-field MRI

2013 ◽  
Vol 237 ◽  
pp. 169-174 ◽  
Author(s):  
Aaron M. Coffey ◽  
Milton L. Truong ◽  
Eduard Y. Chekmenev
Keyword(s):  
High Field ◽  
High Field Mri ◽  
Low Field ◽  
Low Field Mri

Usefulness of Intraoperative Ultra Low-field Magnetic Resonance Imaging in Glioma Surgery

2008 ◽  
Vol 63 (suppl_4) ◽  
pp. ONS257-ONS267 ◽  
Author(s):  
Christian Senft ◽  
Volker Seifert ◽  
Elvis Hermann ◽  
Kea Franz ◽  
Thomas Gasser
Keyword(s):  
Magnetic Resonance Imaging ◽  
Magnetic Resonance ◽  
Tumor Resection ◽  
Extent Of Resection ◽  
Resonance Imaging ◽  
Complete Tumor Resection ◽  
Glioma Surgery ◽  
Low Field ◽  
Low Field Mri ◽  
Complete Tumor

Abstract Objective: The aim of this study was to demonstrate the usefulness of a mobile, intraoperative 0.15-T magnetic resonance imaging (MRI) scanner in glioma surgery. Methods: We analyzed our prospectively collected database of patients with glial tumors who underwent tumor resection with the use of an intraoperative ultra low-field MRI scanner (PoleStar N-20; Odin Medical Technologies, Yokneam, Israel/Medtronic, Louisville, CO). Sixty-three patients with World Health Organization Grade II to IV tumors were included in the study. All patients were subjected to postoperative 1.5-T imaging to confirm the extent of resection. Results: Intraoperative image quality was sufficient for navigation and resection control in both high-and low-grade tumors. Primarily enhancing tumors were best detected on T1-weighted imaging, whereas fluid-attenuated inversion recovery sequences proved best for nonenhancing tumors. Intraoperative resection control led to further tumor resection in 12 (28.6%) of 42 patients with contrast-enhancing tumors and in 10(47.6%) of 21 patients with noncontrast-enhancing tumors. In contrast-enhancing tumors, further resection led to an increased rate of complete tumor resection (71.2 versus 52.4%), and the surgical goal of gross total removal or subtotal resection was achieved in all cases (100.0%). In patients with noncontrast-enhancing tumors, the surgical goal was achieved in 19 (90.5%) of 21 cases, as intraoperative MRI findings were inconsistent with postoperative high-field imaging in 2 cases. Conclusion: The use of the PoleStar N-20 intraoperative ultra low-field MRI scanner helps to evaluate the extent of resection in glioma surgery. Further tumor resection after intraoperative scanning leads to an increased rate of complete tumor resection, especially in patients with contrast-enhancing tumors. However, in noncontrast-enhancing tumors, the intraoperative visualization of a complete resection seems less specific, when compared with postoperative 1.5-T MRI.

SU-FF-T-372: Registration of Frameless High-Field MRI to Low-Field Frame-Based MRI Images in Leksell Gamma-Knife (LGK) Radiosurgery

2007 ◽  
Vol 34 (6Part13) ◽  
pp. 2487-2487
Author(s):  
X Wu ◽  
S Spencer ◽  
J Fiveash ◽  
I Brezovich ◽  
J Duan ◽  
...  
Keyword(s):  
Gamma Knife ◽  
High Field ◽  
High Field Mri ◽  
Low Field

Evaluation of Magnetic Resonance Imaging Responsiveness in Active Psoriatic Arthritis at Multiple Timepoints during the First 12 Weeks of Antitumor Necrosis Factor Therapy

2015 ◽  
Vol 43 (1) ◽  
pp. 75-80 ◽  
Author(s):  
Marie Feletar ◽  
Stephen Hall ◽  
Paul Bird
Keyword(s):  
Magnetic Resonance Imaging ◽  
Psoriatic Arthritis ◽  
Magnetic Resonance ◽  
High Field ◽  
Early Response ◽  
Resonance Imaging ◽  
Low Field ◽  
Low Field Mri ◽  
Magnetic Resonance Imaging Mri ◽  
Necrosis Factor

Objective.To assess the responsiveness of high- and low-field extremity magnetic resonance imaging (MRI) variables at multiple timepoints in the first 12 weeks post-antitumor necrosis factor (anti-TNF) therapy initiation in patients with psoriatic arthritis (PsA) and active dactylitis.Methods.Twelve patients with active PsA and clinical evidence of dactylitis involving at least 1 digit were recruited. Patients underwent sequential high-field conventional (1.5 Tesla) and extremity low-field MRI (0.2 Tesla) of the affected hand or foot, pre- and postgadolinium at baseline (pre-TNF), 2 weeks (post-TNF), 6 weeks, and 12 weeks. A blinded observer scored all images on 2 occasions using the PsA MRI scoring system.Results.Eleven patients completed the study, but only 6 patients completed all high-field and low-field MRI assessments. MRI scores demonstrated rapid response to TNF inhibition with score reduction in tenosynovitis, synovitis, and osteitis at 2 weeks. Intraobserver reliability was good to excellent for all variables. High-field MRI demonstrated greater sensitivity to tenosynovitis, synovitis, and osteitis and greater responsiveness to change posttreatment. Treatment responses were maintained to 12 weeks.Conclusion.This study demonstrates the use of MRI in detecting early response to biologic therapy. MRI variables of tenosynovitis, synovitis, and osteitis demonstrated responsiveness posttherapy with high-field scores more responsive to change than low-field scores.

Low-field vs. high-field MRI in diagnosing breast disorders

2006 ◽  
Vol 30 (1) ◽  
pp. 71
Author(s):  
E. Pääkkö ◽  
H. Reinikainen ◽  
E.L. Lindholm ◽  
T. Rissanen
Keyword(s):  
High Field ◽  
High Field Mri ◽  
Low Field
Sign in / Sign up

Export Citation Format

Share Document