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US 2006/0139027 A1Published application
Spectroscopic imaging method, device comprising elements for carrying out said method and use of said imaging method for charctering materials
OwnerWolfgang Dreher, Christian Geppert +1inventors
InventorsWolfgang Dreher, Christian Geppert, Matthias Althaus
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Abstract
In a spectroscopic magnetic resonance imaging method and apparatus, one or both of an SSFP-RF FID-like signal and an SSFP-RF echo-like signal are read out in one or two readout windows. The readout of this signal or these signals can take place with or without the presence of a magnetic field gradient.
Claims66
1-54. (canceled)
A spectroscopic imaging method using an SSFP-RF excitation pulse sequence, comprising the steps of:
- with a repetition time TR, irradiating RF excitation pulses, each having a flip angle, into a subject;
- between said RF excitation pulses, in a first read-out window without a magnetic field gradient, reading out an FID-like SSFP signal S1, and in a second readout window separate from said first readout window and without a magnetic gradient field, reading out an echo-like SSFP signal S2;
- before said readout window, activating at least one phase coding gradient that phase codes said subject in at least one spatial direction;
- and
- before a next RF excitation pulse, activating at least one further phase coding gradient that cancels said phase coding gradient in said at least one spatial direction.
2 more elements
A spectroscopic imaging method using an SSFP-RF excitation pulse sequence, comprising the steps of:
- with a repetition time TR, irradiating a subject with RF excitation pulses, each having a flip angle;
- between said RF excitation pulses, in a single readout window without a magnetic field gradient, reading out a single FID-like SSFP signal;
- before said readout window, activating at least one phase coding gradient to phase code said subject in at least one spatial direction;
- and
- before a next RF excitation pulse, activating at least one further phase code gradient to cancel said phase coding in said at least one spatial direction.
2 more elements
A spectroscopic imaging method using an SSFP-RF excitation pulse sequence, comprising the steps of:
- with a repetition time TR, irradiating a subject with RF excitation pulses, each having a flip angle;
- before said RF excitation pulses, and in a single readout window without a magnetic field gradient, reading out a single echo-like SSFP signal;
- before said readout window, activating at least one phase coding gradient to phase code said subject in at least one spatial direction;
- and
- before a next RF excitation pulse, activating at least one further phase coding gradient to cancel said phase coding in said at least one spatial direction.
2 more elements
A spectroscopic imaging method using an SSFP-RF excitation pulse sequence, comprising the steps of:
- with a repetition time, irradiating a subject with RF excitation pulses, each having a flip angle;
- between said RF excitation pulses, in a first readout window occurring simultaneously with at least one readout gradient alternating in a spatial direction, reading out an FID-like SSFP signal S1 and, in a second readout window separate from said first readout window, occurring simultaneously with at least one further readout gradient alternating in a spatial direction, reading out an echo-like SSFP signal S2.
A spectroscopic imaging method using an SSFP-RF excitation pulse sequence, comprising the steps of:
- with a repetition time TR, irradiating a subject with RF excitation pulses, each having a flip angle;
- and
- between said RF excitation pulses, activating at least one readout gradient in a single readout window, said at least one readout gradient oscillating in a spatial direction, and reading out a single FID-like SSFP signal.
A spectroscopic imaging method using an SSFP-RF excitation pulse sequence, comprising the steps of:
- with a repetition time TR, irradiating a subject with RF excitation pulses, each having a flip angle;
- and
- between said RF excitation pulses, activating at least one readout gradient in a single readout window, said at least one readout gradient oscillating in a spatial direction, and reading out a single echo-like SSFP signal.
A magnetic resonance spectroscopy apparatus comprising:
- a radio frequency resonator arrangement and a gradient coil system;
- and
- a control unit for operating said magnetic resonance scanner to, with a repetition time, irradiate the subject with RF excitation pulses emitted from said RF resonator arrangement, each of said RF excitation pulses having a flip angle, and, between said RF excitation pulses, in a first readout window without a magnetic field gradient, readout an FID-like SSFP signal S1 and, in a second readout window separate from said first readout window and without a magnetic field gradient, to readout an echo-like SSFP signal S2, and to activate, before said first readout window, at least one phase coding gradient emitted by said gradient coil system to phase code the subject in at least one spatial direction, and to activate at least one further phase coding gradient emitted by said gradient coil system to cancel said phase coding in said at least one spatial direction.
A magnetic resonance spectroscopy apparatus comprising:
- a radio frequency resonator arrangement and a gradient coil system;
- a control unit for operating said magnetic resonance scanner to, with a repetition time, irradiate the subject with RF excitation pulses, emitted from said RF resonator arrangement, each having a flip angle, and, between said RF excitation pulses, in a single readout window without a magnetic field gradient, to readout a single FID-like SSFP signal, and before said readout window to activate at least one phase coding gradient, emitted by said gradient coil system, to phase code said subject in at least one spatial direction and, before a next RF excitation pulse, to activate at least one further phase coding gradient, emitted by said gradient coil system, to cancel said phase coding in said at least one spatial direction.
A magnetic resonance spectroscopy apparatus comprising:
- a radio frequency resonator arrangement and a gradient coil system;
- a control unit for operating said magnetic resonance scanner to, with a repetition time, irradiate the subject with RF excitation pulses, emitted from said RF resonator arrangement, each having a flip angle, and, between said RF excitation pulses, in a single readout window without a magnetic field gradient, to readout a single echo-like SSFP signal, and before said readout window to activate at least one phase coding gradient, emitted by said gradient coil system, to phase code said subject in at least one spatial direction and, before a next RF excitation pulse, to activate at least one further phase coding gradient, emitted by said gradient coil system, to cancel said phase coding in said at least one spatial direction.
A magnetic resonance spectroscopy apparatus comprising:
- a radio frequency resonator arrangement and a gradient coil system;
- a control unit for operating said magnetic resonance scanner to, with a repetition time, irradiate said subject with RF excitation pulses, emitted from said RF resonator arrangement, each having a flip angle, and, between said RF excitation pulses, in a first readout window, to activate at least one readout gradient, emitted from said gradient coil system, alternating in one spatial direction, to readout an FID-like SSFP signal S1 and, in a second readout window separate from said first readout window, to activate at least one readout gradient alternating in one spatial direction, to readout an echo-like SSFP signal.
A magnetic resonance spectroscopy apparatus comprising:
- a radio frequency resonator arrangement and a gradient coil system;
- a control unit for operating said magnetic resonance scanner to, with a repetition time, irradiate said subject with RF excitation pulses, emitted from said RF resonator arrangement, each having a flip angle and, between said RF excitation pulses, in a single readout window, to activate at least one readout gradient alternating in one spatial direction, to readout a single FID-like signal.
A magnetic resonance spectroscopy apparatus comprising:
- a radio frequency resonator arrangement and a gradient coil system;
- a control unit for operating said magnetic resonance scanner to, with a repetition time, irradiate said subject with RF excitation pulses, emitted from said RF resonator arrangement, each having a flip angle and, between said RF excitation pulses, in a single readout window, to activate at least one readout gradient alternating in one spatial direction, to readout a single echo-like signal.
Dependencies are inferred from the claim text.