Multi-dimensional magnetic resonance imaging in a stray magnetic field

Baltisberger, Jay H.; Hediger, Sabine; Emsley, Lyndon

doi:10.1016/j.jmr.2004.09.019

Cited by 18 publications

(26 citation statements)

References 21 publications

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“…Even though extremely promising recent developments in the areas of microdetection come from nano-sized solid-state detectors (such as diamond NV centers (60) and cantilevers (61)), the versatility and user friendliness of microcoils together with the possibility to use traditional NMR sequences makes them a gold standard for the detection of microscopic size samples or objects. In combination with extremely strong field gradients coming either from pulsed B 0 coils (62,63), static stray B 0 fields (64)(65)(66) or even pulsed radio-frequency B 1 gradients (67), they can also offer ultra high spatial resolution 3D microscopic imaging and open the way for new types of investigations.…”

Section: Discussionmentioning

confidence: 99%

NMR signal detection using inductive coupling: Applications to rotating microcoils

Jacquinot

Sakellariou

2011

Concepts Magnetic Resonance

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Sensitivity in solid-state nuclear magnetic resonance can be improved by the use of rotating microcoils (1). The connection to the rest of the electronics is performed through resonant inductive coupling. This mode of detection of nuclear induction has major advantages as it provides a wireless way to obtain extremely high radio-frequency amplitudes per unit current under sample rotation and thus improved sensitivity for size-limited samples. We review the circuit electronics and discuss experimental optimization of the probe and coil parameters. We also present alternative geometries for coupling between rotating coils and we explicitly calculate the signal enhancement. Two practical cases are presented, namely a standard magic angle sample spinning probe and a double sample rotation probe. We conclude with a theoretical discussion about the limits of detection attainable with coil miniaturization.

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Section: Discussionmentioning

confidence: 99%

NMR signal detection using inductive coupling: Applications to rotating microcoils

Jacquinot

Sakellariou

2011

Concepts Magnetic Resonance

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“…The 2D image is carried out under a slow continuous magic-angle rotation, having a frequency of 105 Hz with stability of less than 61 Hz. The slow and stable rotation reduces the image distortion arises from the change in the gradient orientation during t 1 and t 2 (12). Moreover, short echo period (D ¼ 5 ms) is used to minimize the distortion arising from the slight difference in the gradient orientation during each D period (12).…”

Section: Methodsmentioning

confidence: 99%

“…However, with the advancements in NMR technology, high rf-power MAS probe is readily available. Baltisberger et al (12) have demonstrated the experiment and presented 2D 1 H images. Diagram showing the sample body-fame axes, x, y, and z, undergoing a change of its orientation after a successive 120 rotation along the magic-angle axis: z !…”

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confidence: 95%

“…In 2005, Baltisberger et al (12) have proposed an ingenious approach for acquiring multidimensional images by combining the stray-field gradient and the line-narrowing MAS technique, where MAS is also used as a tool for sample reorientation. This technique is called STRAFI-MAS.…”

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confidence: 99%

“…B: STRAFI-MAS pulse experiments for encoding the k-space along the x, y, and z body-axes to give raise to 2D and 3D spin density images. The coherence pathways of the experiment were selected as described in Baltisberger et al (12). T r is one rotor period of a MAS rotation.…”

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confidence: 99%

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Two‐ and three‐dimensional multinuclear stray‐field imaging of rotating samples with magic‐angle spinning (STRAFI‐MAS): From bio to inorganic materials

Wong

Sakellariou

2010

Magnetic Resonance Imaging

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Purpose: To revisit and illustrate the potential of a simple and effective multidimensional stray-field imaging technique with magic-angle spinning, known as STRAFI-MAS.Materials and Methods: STRAFI-MAS images are acquired with a standard NMR magnet and a traditional magic-angle sample spinning (MAS) probe. The stray-field gradients are achieved by placing the MAS probe, along the z-direction, at a distance from the center of the magnet. No pulsed-field gradients are applied. The multidimensional spatial encoding is carried out by synchronizing the radiofrequency pulses with the sample MAS rotation.Results: Two-dimensional (2D) and 3D multinuclear images of various phantoms, including a tibia bone and silicon carbide, are recorded. Images of inorganic solids containing quadrupolar nuclei, 23 Na and 27 Al, are also explored for the first time by STRAFI-MAS. Conclusion:We have demonstrated that STRAFI-MAS is a simple and user-friendly technique for multidimensional imaging without the need of imaging equipment. With the current advancements in NMR and MRI methodologies, STRAFI-MAS is expected to be further developed and improved. We anticipate that STRAFI-MAS can spark a wide spectrum of interest, from material to bio science, where can benefit from high-resolution images.

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Stray-Field (STRAFI) NMR: Imaging in Large Field Gradients

Randall

2011

Encyclopedia of Magnetic Resonance

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Multi-dimensional magnetic resonance imaging in a stray magnetic field

Cited by 18 publications

References 21 publications

NMR signal detection using inductive coupling: Applications to rotating microcoils

NMR signal detection using inductive coupling: Applications to rotating microcoils

Two‐ and three‐dimensional multinuclear stray‐field imaging of rotating samples with magic‐angle spinning (STRAFI‐MAS): From bio to inorganic materials

Stray-Field (STRAFI) NMR: Imaging in Large Field Gradients

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