Magnetic resonance method and device
AssigneeU.S. Philips Corporation
InventorsGerrit H. van Yperen, Johan S. van den Brink, Hans G. Jenniskens
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Abstract
The invention relates to a method for imaging diffusion parameters of a body by means of magnetic resonance. The method involves an adjustment pulse sequence and an imaging pulse sequence. The adjustment pulse sequence measures preparation MR signals. The imaging pulse sequence measures position-dependent MR signals. The imaging pulse sequence is adjusted on the basis of information from the preparation MR signals measured during the adjustment pulse sequence.
Claims7
A method of imaging diffusion parameters of a body by means of magnetic resonance (MR) including:
- generating an imaging pulse sequence comprising
- generating an excitation RF pulse,
- generating a magnetization preparation pulse sequence for adjusting a magnetization preparation,
- generating an additional RF pulse in order to eliminate a non-Meibohm-Gill (MG) component,
- generating refocusing RF pulses, and
- applying first and second crusher magnetic field gradients in order to measure position-dependent MR signals, and
- generating an adjustment pulse sequence comprising
- generating a preparatory excitation RF pulse,
- applying a preparatory magnetization preparation pulse sequence,
- generating a preparatory additional RF pulse in order to select an MG component,
- generating preparatory refocusing RF pulses,
- applying first and second preparatory crusher magnetic field gradients, and
- measuring preparatory magnetic resonance signals,
- wherein the additional RF pulse in the imaging pulse sequence is adjusted in dependence on a parameter which is determined from the preparatory MR signals measured in the adjustment pulse sequence.
A magnetic resonance device for imaging an object to be examined which is arranged in a steady magnetic field comprising:
- means for sustaining a steady magnetic field,
- means for applying gradients,
- means for generating RF pulses applied to the object to be examined in the steady magnetic field,
- a control unit for controlling the means for applying gradients and the means for generating RF pulses, and
- means for receiving and sampling magnetic resonance signals which are generated by pulse sequences containing RF pulses and gradients,
- wherein said control unit is also arranged to execute a method including:
- generating an imaging pulse sequence comprising
- generating an excitation RF pulse,
- executing a magnetic preparation pulse sequence in order to adjust a magnetization preparation,
- generating an additional RF pulse in order to eliminate a non-Meibohm-Gill (MG) component,
- generating refocusing RF pulses, and
- applying first and second crusher magnetic field gradients in order to measure position-dependent MR signals, and
- generating an adjustment pulse sequence comprising
- generating a preparatory excitation RF pulse,
- applying a preparatory magnetization preparation pulse sequence,
- generating a preparatory additional RF pulse in order to select an MG component,
- generating preparatory refocusing RF pulses,
- applying first and second preparatory crusher magnetic field gradients, and
- measuring preparatory magnetic resonance signals, and
- wherein the control unit is also arranged to adjust the additional RF pulse in the imaging pulse sequence in dependence on a parameter which is determined from the preparatory MR signals measured in the adjustment pulse sequence.
Dependencies are inferred from the claim text.