Systems and methods for multiband sweep imaging with fourier transformation
First Claim
1. A method of producing a magnetic resonance (MR) image of a subject with a magnetic resonance imaging (MRI) system, the steps of the method comprising:
- (a) directing the MRI system to perform a pulse sequence that includes;
applying a sweeping frequency excitation having a duration, the sweeping frequency excitation comprising a plurality of spaced apart radio frequency (RF) excitation pulses each having a pulse width and each of the RF excitation pulses being spaced apart by a same inter-pulse spacing that is selected such that the sweeping frequency excitation simultaneously excites multiple different resonance frequencies at sidebands determined by the selected inter-pulse spacing;
acquiring a time domain signal during the duration, the time domain signal being based on evolution of the spins; and
(b) producing an MR image from the acquired time domain signal,wherein at least one dimension of a matrix size of the MR image produced in step (b) is equal to a number of the sidebands covering a field-of-view depicted in the produced MR image andwherein the number of sidebands covering the field-of-view depicted in the produced MR image is at least two.
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Abstract
Systems and methods for magnetic resonance imaging (“MRI”) using a frequency swept excitation that utilizes multiple sidebands to achieve significant increases in excitation and acquisition bandwidth are provided. The imaging sequence efficiently uses transmitter power and has increased sensitivity as compared to other techniques used for imaging of fast relaxing spins. Additionally, the imaging sequence can provide information about both fast and slow relaxing spins in a single scan. These features are advantageous for numerous MRI applications, including musculoskeletal imaging, other medical imaging applications, and imaging materials.
22 Citations
10 Claims
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1. A method of producing a magnetic resonance (MR) image of a subject with a magnetic resonance imaging (MRI) system, the steps of the method comprising:
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(a) directing the MRI system to perform a pulse sequence that includes; applying a sweeping frequency excitation having a duration, the sweeping frequency excitation comprising a plurality of spaced apart radio frequency (RF) excitation pulses each having a pulse width and each of the RF excitation pulses being spaced apart by a same inter-pulse spacing that is selected such that the sweeping frequency excitation simultaneously excites multiple different resonance frequencies at sidebands determined by the selected inter-pulse spacing; acquiring a time domain signal during the duration, the time domain signal being based on evolution of the spins; and (b) producing an MR image from the acquired time domain signal, wherein at least one dimension of a matrix size of the MR image produced in step (b) is equal to a number of the sidebands covering a field-of-view depicted in the produced MR image and wherein the number of sidebands covering the field-of-view depicted in the produced MR image is at least two. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10)
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Specification