Magnetic resonance spectroscopy with phase rotation
First Claim
1. A method for acquiring a magnetic resonance (MR) signal from an examination subject, comprising:
- operating an MR data acquisition unit, comprising a radio-frequency (RF) transmitter and a gradient coil system and an RF receiver, according to a pulse sequence, while an examination subject is situated in the MR data acquisition unit;
in said pulse sequence, operating said RF transmitter to radiate a first RF pulse that acts on a voxel in the examination subject, having a first phase, while simultaneously operating said gradient coil system to activate a gradient magnetic field in a first direction that also acts on said voxel;
in said pulse sequence, operating said RF transmitter to radiate a second RF pulse that also acts on said voxel, having a second phase and to radiate a third RF pulse, having a third phase, while simultaneously operating said gradient coil system to activate a gradient magnetic field in a second direction that also acts on said voxel;
in said pulse sequence, operating said RF transmitter to radiate a fourth RF pulse that also acts on said voxel, having a fourth phase, and a fifth RF pulse that also acts on said voxel having a fifth phase, while simultaneously operating said gradient coil system to activate a gradient magnetic field in a third direction that also acts on said voxel;
in said pulse sequence, operating said RF receiver to acquire an MR signal from voxel in said examination subject resulting from a state of excitation of nuclear spins in said voxel in the examination subject produced by a combination of said first, second, third, fourth and fifth RF pulses, and entering the acquired MR signal into an electronic memory;
operating said MR data acquisition unit by repeating said pulse sequence a plurality of times with a phase rotation of said first, second, third, fourth and fifth phases in each repetition, with said third and fourth phases being the same in each repetition, and thereby compiling a set of MR signals in said electronic memory respectively resulting from each repetition; and
making said set of MR signals in said electronic memory available from said memory in electronic form as a data file for further processing thereof.
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Accused Products
Abstract
In a method and magnetic resonance (MR) apparatus for acquiring an MR signal from an examination subject according to a pulse sequence, a first radio-frequency pulse is applied with a first phase and a gradient field is simultaneously applied in a first direction. Second and third radio-frequency pulses, with second and third phases, respectively, are applied simultaneously with a gradient field in a second direction. A fourth and a fifth radio-frequency pulse, with a fourth and a fifth phase, respectively, are applied and simultaneously with a gradient field in a third direction. A signal with a receiver phase is acquired =. The pulse sequence is repeated a number of times under phase rotation, wherein the third and fourth radio-frequency pulses in each repetition have the same phase, and the signals acquired in the repetition are added.
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Citations
13 Claims
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1. A method for acquiring a magnetic resonance (MR) signal from an examination subject, comprising:
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operating an MR data acquisition unit, comprising a radio-frequency (RF) transmitter and a gradient coil system and an RF receiver, according to a pulse sequence, while an examination subject is situated in the MR data acquisition unit; in said pulse sequence, operating said RF transmitter to radiate a first RF pulse that acts on a voxel in the examination subject, having a first phase, while simultaneously operating said gradient coil system to activate a gradient magnetic field in a first direction that also acts on said voxel; in said pulse sequence, operating said RF transmitter to radiate a second RF pulse that also acts on said voxel, having a second phase and to radiate a third RF pulse, having a third phase, while simultaneously operating said gradient coil system to activate a gradient magnetic field in a second direction that also acts on said voxel; in said pulse sequence, operating said RF transmitter to radiate a fourth RF pulse that also acts on said voxel, having a fourth phase, and a fifth RF pulse that also acts on said voxel having a fifth phase, while simultaneously operating said gradient coil system to activate a gradient magnetic field in a third direction that also acts on said voxel; in said pulse sequence, operating said RF receiver to acquire an MR signal from voxel in said examination subject resulting from a state of excitation of nuclear spins in said voxel in the examination subject produced by a combination of said first, second, third, fourth and fifth RF pulses, and entering the acquired MR signal into an electronic memory; operating said MR data acquisition unit by repeating said pulse sequence a plurality of times with a phase rotation of said first, second, third, fourth and fifth phases in each repetition, with said third and fourth phases being the same in each repetition, and thereby compiling a set of MR signals in said electronic memory respectively resulting from each repetition; and making said set of MR signals in said electronic memory available from said memory in electronic form as a data file for further processing thereof. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12)
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13. A magnetic resonance apparatus comprising:
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an MR data acquisition unit comprising a radio-frequency (RF) transmitter and a gradient coil system and an RF receiver; a control computer configured to operate said MR data acquisition unit according to a pulse sequence, while an examination subject is situated in the MR data acquisition unit; an electronic memory; said control computer being configured to operate said RF transmitter in said pulse sequence to radiate a first RF pulse that acts on a voxel in the examination subject, having a first phase, while simultaneously operating said gradient coil system to activate a gradient magnetic field in a first direction that also acts on said voxel; said control computer being configured to operate said RF transmitter in said pulse sequence to radiate a second RF pulse that also acts on said voxel, having a second phase and to radiate a third RF pulse, having a third phase, while simultaneously operating said gradient coil system to activate a gradient magnetic field in a second direction that also acts on said voxel; said control computer being configured to operate said RF transmitter in said pulse sequence to radiate a fourth RF pulse that also acts on said voxel, having a fourth phase, and a fifth RF pulse that also acts on said voxel, having a fifth phase, while simultaneously operating said gradient coil system to activate a gradient magnetic field in a third direction that also acts on said voxel; said control computer being configured to operate said RF receiver in said pulse sequence to acquire an MR signal from said voxel in said examination subject resulting from a state of excitation of nuclear spins in said voxel in the examination subject produced by a combination of said first, second, third, fourth and fifth RF pulses, and to enter the acquired MR signal into said electronic memory; said control computer being configured to operate said MR data acquisition unit by repeating said pulse sequence a plurality of times with a phase rotation of said first, second, third, fourth and fifth phases in each repetition, with said third and fourth phases being the same in each repetition, and thereby compile a set of MR signals in said electronic memory respectively resulting from each repetition; and said control computer being configured to make said set of MR signals in said electronic memory available from said memory in electronic form as a data file for further processing thereof.
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Specification