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Magnetic Adjustment of Afterload in Engineered Heart Tissues
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An X0 shim coil for precise magic-angle adjustment.

Tatsuya Matsunaga1, Takashi Mizuno2, K Takegoshi1

  • 1Division of Chemistry, Graduate School of Science, Kyoto University, 606-8502 Kyoto, Japan.

Journal of Magnetic Resonance (San Diego, Calif. : 1997)
|May 10, 2015
PubMed
Summary

A novel X0 shim coil enables precise control of the spinning angle to the magic angle in magnetic resonance. This method offers backlash-free adjustment, enhancing experimental accuracy without mechanical systems.

Keywords:
High resolution solid state NMRMASX(0) shim coil

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Area of Science:

  • Magnetic Resonance Imaging
  • Spectroscopy
  • Coil Design

Background:

  • Precise control of the spinning angle is crucial for magic angle spinning (MAS) NMR.
  • Conventional mechanical systems for angle adjustment can be prone to backlash and inaccuracies.
  • The need for a more accurate and reliable method for setting the magic angle in NMR experiments.

Purpose of the Study:

  • To introduce a new method for precise setting of the spinning angle to the magic angle using a saddle coil.
  • To demonstrate the effectiveness of the X0 shim coil in controlling the angle between the spinner axis and the effective magnetic field.
  • To provide a backlash-free alternative to conventional mechanical angle adjustment systems.

Main Methods:

  • Utilizing an X0 shim coil designed to produce a uniform static magnetic field (Bx) perpendicular to the main magnetic field (B0).
  • Controlling the angle by adjusting the current (I) supplied to the X0 shim coil, thereby manipulating the vector sum of B0 and Bx.
  • Implementing this method in a 7 Tesla (7T) magnetic field setting.

Main Results:

  • Achieved precise angle adjustment without the backlash associated with mechanical systems.
  • Demonstrated an angle range of ±0.05° for a current of ±5A at B0=7T.
  • Validated the capability of the X0 shim coil to finely tune the spinning angle.

Conclusions:

  • The X0 shim coil provides a highly accurate and reliable method for setting the spinning angle to the magic angle.
  • This electronic control method eliminates mechanical limitations, improving the precision of magnetic resonance experiments.
  • The developed technique offers significant advantages for applications requiring precise magic angle spinning NMR.