Frequency swept excitation for magnetic resonance
First Claim
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1. A method comprising:
- using a magnetic resonance scanner to apply an excitation sequence to a specimen, the excitation sequence including a series of repeated pulses, each pulse having a pulse duration less than a repetition time for the repeated pulses, and each pulse having a plurality of alternating excitation segments and quiescent segments and each pulse modulated in frequency or modulated in phase;
acquiring a response signal simultaneous with application of the excitation sequence; and
generating an image using the response signal.
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Abstract
A method of magnetic resonance is provided that uses a frequency swept excitation wherein the acquired signal is a time domain signal is provided. In one embodiment, the method comprises, applying a sweeping frequency excitation and acquiring a time domain signal. The sweeping frequency excitation has a duration and is configured to sequentially excite isochromats having different resonant frequencies. Acquisition of the time domain signal is done during the duration of the sweeping frequency excitation. The time domain signal is based on evolution of the isochromats.
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Citations
20 Claims
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1. A method comprising:
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using a magnetic resonance scanner to apply an excitation sequence to a specimen, the excitation sequence including a series of repeated pulses, each pulse having a pulse duration less than a repetition time for the repeated pulses, and each pulse having a plurality of alternating excitation segments and quiescent segments and each pulse modulated in frequency or modulated in phase; acquiring a response signal simultaneous with application of the excitation sequence; and generating an image using the response signal. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12)
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13. A method comprising:
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using a magnetic resonance scanner to provide an excitation signal to a specimen, the excitation signal including a plurality of pulses, each pulse having modulated excitation segments separated by quiescent segments, the excitation segments modulated in phase or modulated in frequency; acquiring a response signal corresponding to relaxation of isochromats of the specimen; and generating an output based on the response signal. - View Dependent Claims (14, 15, 16, 17, 18, 19, 20)
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Specification