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US 2018/0024214 A1Published application
Multi-contrast simultaneous multislice magnetic resonance imaging with binomial radio-frequency pulses
AssigneeSiemens Healthcare GmbH
InventorsHimanshu Bhat, Mario Zeller
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Abstract
In a magnetic resonance apparatus and a method for operating the MR apparatus to acquire MR data in a single scan with different contrasts, nuclear spins in multiple slices of an examination subject are simultaneously excited in a single scan, with a simultaneous multi-slice acquisition sequence, in which a radio-frequency multi-band binomial pulse is radiated.
Claims24
A method for acquiring magnetic resonance (MR) raw data with two contrasts in a single scan, said method comprising:
- operating an MR data acquisition scanner, while an examination subject is situated therein in a basic magnetic field having a basic field direction, to execute a simultaneous multi-slice (SMS) data acquisition sequence in which nuclear spins respectively in multiple slices of the examination subject are simultaneously excited by, in a single scan of the examination subject, radiating, from a radio-frequency (RF) radiator of said MR data acquisition scanner, a multi-band (MB) binomial RF pulse in said SMS data acquisition sequence;
- generating said MB binomial RF pulse in said SMS data acquisition sequence by radiating a first subset of pulses that excite different nuclear spin species in a first slice among said multiple slices so as to give the different nuclear spin species respectively different magnetizations in said first slice with respect to said basic field direction that produce a first contrast when an image of said first slice is reconstructed, and a second subset of pulses that excite nuclear spins in a second slice among said multiple slices so as to give the different nuclear spin species respectively different magnetizations in said second slice with respect to said basic field direction that produce a second contrast when an image of said second slice is reconstructed, said first and second contrasts being different from each other;
- in said SMS data acquisition sequence, acquiring raw MR data at least from said first and second slices after said simultaneous excitation of nuclear spins with said MB binomial RF pulse, and entering the acquired raw MR data from said at least first and second slices as k-space data into an electronic memory, organized as k-space;
- and
- via a computer having access to said electronic memory, making the k-space data in said electronic memory available in electronic form, as a datafile.
2 more elements
A magnetic resonance (MR) apparatus comprising:
- an MR data acquisition scanner comprising a radio-frequency (RF) radiator, and a basic field magnet that produces a basic magnetic field in a basic field direction;
- a computer configured to operate the MR data acquisition scanner, while an examination subject is situated therein in said basic magnetic field, to execute a simultaneous multi-slice (SMS) data acquisition sequence in which nuclear spins respectively in multiple slices of the examination subject are simultaneously excited by, in a single scan of the examination subject, radiating, from a radio-frequency (RF) radiator of said MR data acquisition scanner, a multi-band (MB) binomial RF pulse in said SMS data acquisition sequence;
- said computer being configured to operate the MR data acquisition scanner in said SMS data acquisition sequence to generate said MB binomial RF pulse in said SMS data acquisition sequence by radiating a first subset of pulses that excite nuclear spin species in a first slice among said multiple slices so as to give the different nuclear spin species respectively different magnetizations in said first slice with respect to said basic field direction that produce a first contrast when an image of said first slice is reconstructed, and a second subset of pulses that excite said different nuclear spin species in a second slice among said multiple slices so as to give the different nuclear spin species respectively different magnetizations in said second slice with respect to said basic field direction that produce a second contrast when an image of said second slice is reconstructed, said first and second contrasts being different from each other;
- said computer being configured to operate the MR data acquisition scanner in said SMS data acquisition sequence in said SMS data acquisition sequence, to acquire raw MR data at least from said first and second slices after said simultaneous excitation of nuclear spins with said MB binomial RF pulse, and to enter the acquired raw MR data from said at least first and second slices as k-space data into said electronic memory, organized as k-space;
- and
- said computer being configured to make the k-space data in said electronic memory available in electronic form, as a datafile.
3 more elements
Dependencies are inferred from the claim text.