By Hans-Martin Klein
This ebook covers all points of low box MRI, describing its benefits, difficulties and conditions. person chapters are dedicated to web site making plans, security concerns, coils, imaging approach, picture caliber optimization, the imaging of other anatomic areas and sure destiny advancements. the standards that has to be borne in brain while picking a low box approach are essentially pointed out and specific awareness is paid to the functions for which one of these method is adequate.
The specialise in excessive box structures has resulted in a state of affairs the place just a couple of platforms with box strengths under 1/2 T live to tell the tale. a few of these structures own excessive box good points comparable to multichannel coils and robust gradients; in addition, series expertise and picture processing innovations taken from greater box power platforms have ended in awesome imaging services. whereas 1.5-T structures will most likely proceed to stay the normal, low box structures supply merits corresponding to the feasibility of dynamic joint examinations, development of T1 distinction, relief of “missile results” and diminished radiofrequency publicity. Low box power MRI hence has the capability to give a contribution to optimum sufferer administration and given related snapshot caliber, its program may perhaps turn into a subject matter of sufferer protection. This ebook might be a useful asset to all who're concerned about making plans and/or operating a low box power MRI facility.
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Additional info for Clinical Low Field Strength Magnetic Resonance Imaging: A Practical Guide to Accessible MRI
MR systems, using vertical magnetic field, enable to design more open MR units, reducing the frequency of claustrophobic reactions during MR procedures. Furthermore, the new so-called wide bore provides larger gantry opening, also reducing spatial restriction. 2 T MRI was made available for MR imaging of the musculoskeletal system. Image quality for diagnosis of the extremities was reported to be comparable to mid- or high-field-strength MR systems and is therefore acceptable as an alternative to whole-body MR systems for musculoskeletal diagnostic imaging.
The system is no longer available. 6, and the Panorama HFO (high field open). These systems had two superconducting magnets above and below the scan plane. 6 T system used a C-shaped steel carrier. 6 T, the magnetic attraction causes a force of about 100 tons between the magnetic poles. 0 T magnets is mounted on two columns to improve weight distribution at the cost of reduced accessibility. Production of these systems is presently ceased, since the achievable market prices do not cover the production costs.
The effect of ferromagnetic bodies, particularly if they are moving, on magnetic field homogeneity is high. This is true for all open-design MR systems (compared with closed-bore machines), but it is particularly important for systems with lower field strength. We had considerable problems with ambulance cars passing by the magnet room. The solution was an electric field inhomogeneity-reduction system (called EFI), provided by the manufacturer of the MRI system. 9 Distortion of Equipment by the MRI Magnetic Fringe Field All instruments and electronic devices, which can be influenced by magnetic fields, have to be taken into consideration.