Single point measurements of magnetic field gradient waveform

Pulsed magnetic field gradients are fundamental to spatial encoding and diffusion weighting in magnetic resonance. The ideal pulsed magnetic field gradient should have negligible rise and fall times, however, there are physical limits to how fast the magnetic field gradient may change with time. Fin...

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Bibliographic Details
Published in:Journal of magnetic resonance (1997) 2003-07, Vol.163 (1), p.1-7
Main Authors: Goodyear, David J., Shea, Maurice, Beyea, Steven D., Shah, Nadim J., Balcom, Bruce J.
Format: Article
Language:English
Subjects:
Agar - chemistry
Eddy current
Electromagnetic Fields
Gradient
Image Enhancement - instrumentation
Image Enhancement - methods
k-Space
Magnetic Resonance Imaging - instrumentation
Magnetic Resonance Imaging - methods
Magnetic Resonance Imaging - standards
Magnetics - instrumentation
Quality Control
Radiometry - methods
Radiometry - standards
Single point
Waveform
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Summary:Pulsed magnetic field gradients are fundamental to spatial encoding and diffusion weighting in magnetic resonance. The ideal pulsed magnetic field gradient should have negligible rise and fall times, however, there are physical limits to how fast the magnetic field gradient may change with time. Finite gradient switching times, and transient, secondary, induced magnetic field gradients (eddy currents) alter the ideal gradient waveform and may introduce a variety of undesirable image artifacts. We have developed a new method to measure the complete magnetic field gradient waveform. The measurement employs a heavily doped test sample with short MR relaxation times ( T 1, T 2, and T 2 *
ISSN:1090-7807
1096-0856
DOI:10.1016/S1090-7807(03)00152-6