Clinical Low Field Strength Magnetic Resonance Imaging by Hans-Martin Klein

Author:Hans-Martin Klein
Language: eng
Format: epub
Publisher: Springer International Publishing, Cham

This extremely fast imaging is strongly influenced by susceptibility effects. Today, it is mainly used for diffusion-weighted imaging (Fig. 6.7).

EPI imaging takes advantage from higher field strength and gradient performance. Therefore, on low-field scanners, it is possible, but less frequently used. There are concerns about safety of EPI imaging: The rapid gradients can cause eddy currents, potentially leading to neuromuscular stimulation.

If multiple gradient echoes are acquired (fast gradient echo), a further increase of speed is possible. The problem is incomplete recovery of magnetization. Different approaches are realized:Refocusing the magnetization with an RF pulse (FISP, FFE).

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