By Hans-Martin Klein
This publication covers all features of low box MRI, describing its merits, difficulties and conditions. person chapters are dedicated to web site making plans, security concerns, coils, imaging method, snapshot caliber optimization, the imaging of alternative anatomic areas and sure destiny advancements. the criteria that has to be borne in brain while picking a low box approach are basically pointed out and exact consciousness is paid to the functions for which one of these approach is adequate.
The specialise in excessive box platforms has ended in a state of affairs the place just a couple of structures with box strengths below 1/2 T continue to exist. a few of these platforms own excessive box positive aspects comparable to multichannel coils and powerful gradients; additionally, series know-how and photo processing suggestions taken from larger box energy structures have ended in awesome imaging services. whereas 1.5-T structures will most likely proceed to stay the normal, low box platforms provide merits corresponding to the feasibility of dynamic joint examinations, development of T1 distinction, aid of “missile results” and diminished radiofrequency publicity. Low box power MRI hence has the aptitude to give a contribution to optimum sufferer administration and given related picture caliber, its program might turn into a subject of sufferer security. This booklet should be a useful asset to all who're occupied with making plans and/or operating a low box power MRI facility.
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6-T in 1023 consecutive outpatients. J Neuroimaging 17:241–5 Zaremba LA (2001) FDA guidance for magnetic resonance system safety and patient exposures: current status and future considerations. In: Shellock FG (ed) Magnetic resonance procedures: health effects and safety. CRC Press, Boca Raton 5 Low-Field-Specific Physical Aspects In low-field MR scanners, some imaging parameters are different from high-field systems. These different characteristics can be of advantage or disadvantage, depending on the imaging situation (Kuhl et al.
This can be partially compensated by well-controlled increase of the gradient power. Incorrect compensation of these eddy currents leads to severe image artifacts. Another option is shielded gradient coils, which are widely free of eddy current artifacts. 3 RF Chain To produce, transmit, and receive a resonance signal of a body positioned in the magnet, we need an RF chain, consisting of transmitter, RF coils, and receiver. 1 Transmitter The transmit circuit starts with a frequency generator. 5 T or 128 MHz for 3 T.
Clinical Low Field Strength Magnetic Resonance Imaging: A Practical Guide to Accessible MRI by Hans-Martin Klein