Method to determine the ADC coefficients in diffusion-weighted magnetic resonance imaging given use of steady-state sequences
First Claim
1. A method for acquiring a diffusion-weighted image in diffusion-weighted MRT imaging, comprising the steps of:
- (a) in a diffusion-weighted measurement, acquiring and storing a non-diffusion-weighted data set from a subject and a diffusion-weighted data set using a DESS sequence by switching two readout gradients successively for acquiring the non-diffusion-weighted data set, and by switching a bipolar diffusion gradient pulse sequence between two readout gradients for acquiring the diffusion-weighted data set; and
(b) calculating a diffusion-weighted MRT image based on the non-diffusion-weighted data set and the diffusion-weighted data set, and based on a value characterizing the diffusion-weighted measurement.
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Abstract
In a magnetic resonance apparatus and method to acquire a diffusion-weighted image in diffusion-weighted MRT imaging, a non-diffusion-weighted data set and a diffusion-weighted data set are measured and stored by means of a DESS sequence (Double Echo Steady State Sequence), with two readout gradients being switched successively for the non-diffusion-weighted data set, and a bipolar diffusion gradient pulse sequence being switched between two readout gradients for the diffusion-weighted data set. A diffusion-weighted MRT image is calculated is calculated based on the non-diffusion-weighted data set and the diffusion-weighted data set, as well as on the basis of a value characterizing the diffusion-weighted measurement.
28 Citations
16 Claims
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1. A method for acquiring a diffusion-weighted image in diffusion-weighted MRT imaging, comprising the steps of:
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(a) in a diffusion-weighted measurement, acquiring and storing a non-diffusion-weighted data set from a subject and a diffusion-weighted data set using a DESS sequence by switching two readout gradients successively for acquiring the non-diffusion-weighted data set, and by switching a bipolar diffusion gradient pulse sequence between two readout gradients for acquiring the diffusion-weighted data set; and
(b) calculating a diffusion-weighted MRT image based on the non-diffusion-weighted data set and the diffusion-weighted data set, and based on a value characterizing the diffusion-weighted measurement. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8)
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9. A magnetic resonance imaging apparatus for acquiring a diffusion-weighted image in diffusion-weighted MRT imaging, comprising:
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a magnetic resonance scanner adapted to receive a subject, said scanner, in a diffusion-weighted measurement, acquiring and storing a non-diffusion-weighted data set and a diffusion-weighted data set from the subject using a DESS sequence by switching two readout gradients successively for acquiring the non-diffusion-weighted data set, and by switching a bipolar diffusion gradient pulse sequence between two readout gradients for acquiring the diffusion-weighted data set; and
a processor for calculating a diffusion-weighted MRT image based on the non-diffusion-weighted data set and the diffusion-weighted data set, and based on a value characterizing the diffusion-weighted measurement. - View Dependent Claims (10, 11, 12, 13, 14, 15, 16)
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Specification