MRI Susceptibility Artefacts Related to Scaphoid Screws: the Effect of Screw Type, Screw Orientation and Imaging Parameters

2002 ◽  
Vol 27 (2) ◽  
pp. 165-170 ◽  
Author(s):  
M. GANAPATHI ◽  
G. JOSEPH ◽  
R. SAVAGE ◽  
A. R. JONES ◽  
B. TIMMS ◽  
...  
Keyword(s):  
Magnetic Resonance Imaging ◽  
Magnetic Field ◽  
Titanium Alloy ◽  
Magnetic Resonance ◽  
Main Magnetic Field ◽  
Resonance Imaging ◽  
Metal Implants ◽  
Imaging Parameters ◽  
Susceptibility Artefact

Metal implants produce susceptibility artefacts in magnetic resonance imaging. We have explored the effects of scaphoid screw characteristics and orientation on MR susceptibility artefact. Titanium alloy, smallness and longitudinal alignment with the z-axis of the main magnetic field reduce the size of the susceptibility artefact.

Intraoperative Magnetic Resonance Imaging-guided neurosurgery at 3-T

2006 ◽  
Vol 58 (suppl_4) ◽  
pp. ONS-338-ONS-346 ◽  
Author(s):  
Charles L. Truwit ◽  
Walter A. Hall
Keyword(s):  
Magnetic Resonance Imaging ◽  
Magnetic Field ◽  
Magnetic Resonance ◽  
Field Strength ◽  
Intraoperative Imaging ◽  
Surgical Techniques ◽  
Main Magnetic Field ◽  
Neurosurgical Procedures ◽  
Resonance Imaging ◽  
Intraoperative Magnetic Resonance Imaging

Abstract Objective: Between 1997 and 2004, more than 700 neurosurgical procedures were performed in a 1.5-T magnetic resonance-guided therapy suite. During this period, the concept of high-field intraoperative magnetic resonance imaging (MRI) was validated, as was a new surgical guidance tool, the Navigus (Image-guided Neurologics, Melbourne, FL), and its methodology, prospective stereotaxy. Clinical protocols were refined to optimize surgical techniques. That implementation, the “Minnesota suite, ” has recently been revised, and a new suite with a 3-T MRI scanner has been developed. Methods: On the basis of experience at the initial 1.5-T suite, a new suite was designed to house a 3-T MRI scanner with wide surgical access at the rear of the scanner (opposite the patient couch). Use of electrocautery, a fiberoptic headlamp, a power drill, and MRI-compatible neurosurgical cutlery was anticipated by inclusion of waveguides and radiofrequency filter panels that penetrate the MRI suite's radiofrequency shield. An MRI-compatible head holder was adapted for use on the scanner table. A few items exhibiting limited ferromagnetism were used within the magnetic field, taking strict precautions. Results: During the initial procedures (all magnetic resonance-guided neurobiopsies), the new suite functioned as anticipated. Although metallic artifact related to titanium needles is more challenging at 3 T than at 1.5 T, it can be contained even at 3 T. Similar to 1.5 T, such artifact is best contained when the device is oriented along B0, the main magnetic field. Surgical needles, disposable scalpels, and disposable razors, despite being minimally ferromagnetic, were easily controlled by the surgeon. Conclusion: An intraoperative magnetic resonance-guided neurosurgical theater has been developed with a 3-T MRI scanner. Intraoperative imaging is feasible at this field strength, and concerns regarding specific absorption rate can be allayed. Infection control procedures can be designed to permit neurosurgery within this environment. Despite the increase in magnetic field strength, safety can be maintained.

Magnetic resonance imaging: effects of magnetic field strength.

Radiology ◽  
1984 ◽  
Vol 151 (1) ◽  
pp. 127-133 ◽  
Author(s):  
L E Crooks ◽  
M Arakawa ◽  
J Hoenninger ◽  
B McCarten ◽  
J Watts ◽  
...  
Keyword(s):  
Magnetic Resonance Imaging ◽  
Magnetic Field ◽  
Magnetic Resonance ◽  
Field Strength ◽  
Magnetic Field Strength ◽  
Resonance Imaging

Triaxial Fiber Optic Magnetic Field Sensor for Magnetic Resonance Imaging

2017 ◽  
Vol 35 (18) ◽  
pp. 3924-3933 ◽  
Author(s):  
Massimo L. Filograno ◽  
Marco Pisco ◽  
Angelo Catalano ◽  
Ernesto Forte ◽  
Marco Aiello ◽  
...  
Keyword(s):  
Magnetic Resonance Imaging ◽  
Magnetic Field ◽  
Magnetic Resonance ◽  
Fiber Optic ◽  
Magnetic Field Sensor ◽  
Resonance Imaging ◽  
Field Sensor

Magnetic resonance imaging without field cycling at less than earth's magnetic field

2015 ◽  
Vol 106 (10) ◽  
pp. 103702 ◽  
Author(s):  
Seong-Joo Lee ◽  
Jeong Hyun Shim ◽  
Kiwoong Kim ◽  
Kwon Kyu Yu ◽  
Seong-min Hwang
Keyword(s):  
Magnetic Resonance Imaging ◽  
Magnetic Field ◽  
Magnetic Resonance ◽  
Resonance Imaging ◽  
Earth’S Magnetic Field ◽  
Earth's Magnetic Field ◽  
Field Cycling

Observation of memory effects associated with degradation of rechargeable lithium-ion cells using ultrafast surface-scan magnetic resonance imaging

2021 ◽  
Vol 9 (37) ◽  
pp. 21078-21084
Author(s):  
Konstantin Romanenko ◽  
Alexej Jerschow
Keyword(s):  
Magnetic Resonance Imaging ◽  
Magnetic Field ◽  
Life Cycle ◽  
Magnetic Resonance ◽  
Lithium Ion ◽  
Resonance Imaging ◽  
Induced Magnetic Field ◽  
Field Patterns ◽  
Lithium Ion Cells ◽  
Surface Scan

Batteries share their “health problems” and “memories” of hazardous life-cycle events via DC-induced magnetic field patterns revealed by MRI.

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