Method for magnetic resonance imaging
First Claim
1. A method of magnetic resonance imaging comprising:
- applying a substantially static magnetic field to an object;
applying an excitation pulse to the object;
applying an acquisition gradient in a time-encoding direction during an acquisition window;
applying on an alternating frequency-encoding gradient in a frequency-encoding direction, the frequency-encoding direction different from the acquisition gradient;
acquiring a signal in the presence of the acquisition gradient and the alternating gradient, the signal being time-encoded, frequency-encoded, and being substantially contiguous; and
using the signal, and at least one processor, to create an image having at least two dimensions of the object.
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Abstract
A method of magnetic resonance imaging based on rapid acquisition by sequential excitation and refocusing is provided. The method comprises turning on a first time-encoding gradient and applying an excitation pulse in the presence of the first time-encoding gradient. The excitation pulse excites magnetization sequentially along one spatial axis. Thereafter, a first refocusing pulse is applied. A second time-encoding gradient is turned on followed by a second refocusing pulse. A third time-encoding gradient is turned on and a signal is acquired in the presence of the third time-encoding gradient. The third time-encoding gradient sums to zero with the first time-encoding gradient and the second time-encoding gradient for sequential points in space.
36 Citations
33 Claims
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1. A method of magnetic resonance imaging comprising:
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applying a substantially static magnetic field to an object; applying an excitation pulse to the object; applying an acquisition gradient in a time-encoding direction during an acquisition window; applying on an alternating frequency-encoding gradient in a frequency-encoding direction, the frequency-encoding direction different from the acquisition gradient; acquiring a signal in the presence of the acquisition gradient and the alternating gradient, the signal being time-encoded, frequency-encoded, and being substantially contiguous; and using the signal, and at least one processor, to create an image having at least two dimensions of the object. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 17, 18, 19, 20, 21, 22)
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16. The method of 1, wherein the excitation pulse has varied frequency.
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23. A method of magnetic resonance imaging comprising:
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applying a substantially static magnetic field to an object; applying excitation to the object; applying a time-encoding acquisition gradient in a time encoding direction and corresponding to the excitation; applying an alternating frequency-encoding gradient in a direction different than the time encoding direction and corresponding to the excitation; acquiring a signal encoded in time using the time-encoding acquisition gradient and encoded in frequency using the alternating frequency-encoding gradient; and generating, using at least one processor, an image of the object using the signal. - View Dependent Claims (24, 25, 26, 27, 28, 29, 30, 31, 32, 33)
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Specification