By Hans-Martin Klein
This booklet covers all facets of low box MRI, describing its benefits, difficulties and conditions. person chapters are dedicated to web site making plans, protection issues, coils, imaging approach, photograph caliber optimization, the imaging of other anatomic areas and sure destiny advancements. the criteria that needs to be borne in brain while deciding on a low box method are essentially pointed out and targeted cognizance is paid to the purposes for which one of these process is adequate.
The concentrate on excessive box platforms has resulted in a state of affairs the place just a couple of structures with box strengths less than half T continue to exist. a few of these structures own excessive box beneficial properties akin to multichannel coils and robust gradients; additionally, series know-how and picture processing thoughts taken from greater box energy platforms have ended in notable imaging services. whereas 1.5-T structures will most likely proceed to stay the traditional, low box platforms supply benefits reminiscent of the feasibility of dynamic joint examinations, development of T1 distinction, aid of “missile results” and reduced radiofrequency publicity. Low box energy MRI accordingly has the capability to give a contribution to optimum sufferer administration and given related snapshot caliber, its program may perhaps develop into a subject of sufferer security. This booklet should be a useful asset to all who're serious about making plans and/or working a low box energy MRI facility.
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Extra info for Clinical Low Field Strength Magnetic Resonance Imaging: A Practical Guide to Accessible MRI
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Klinik und Praxis. Springer, Berlin, pp 22–25 Zijlstra H (1985) Permanent magnetic systems for MR tomography. Philips J Res 40:259–288 3 Site Planning For the installation of low-field MR systems, particularly with permanent magnets, certain special requirements have to be considered. The specific advantages of these systems influence the concept of the scan site and enable to realize MR imaging units in locations that are impossible to service with high-field systems. However, there are certain prerequisites that must be taken into account.
The most important factors contributing to emotional distress are the physical environment of the MR system, combined with acoustic noise, as well as temperature variations inside of the MR system. Furthermore, the restriction of motion causes distress (Eshed 2007). The feeling of sensory deprivation, particularly in Vacuum chamber Gradient coil Sound dampening material Fig. 6 Pacemaker 41 narrow-bore magnets, is experienced negatively by the patient. The duration of the examination plays another important role.
Basically, we have two main concepts for MR magnets: Closed bore superconducting systems with horizontal field, helium consumption and high field strength option. Open permanent magnets with vertical field and limited field strength. Besides all other arguments for permanent magent low field MRI, are there advantages of the vertical field orientation? Vertical fields allow to use solenoid coils instead of saddle coils, which have a higher inherent SNR. This comparison was particularly true for the classic linear polarized 1-channel coil.