US 12,730,173 B2 · Magnetic resonance imaging apparatus and image processing method

Abstract

Provided is a technology capable of effectively obtaining a ringing correction effect even for a two-dimensional image or a three-dimensional image with a simple CNN configuration. A CNN that has been trained to perform ringing correction for a direction of a dimension lower than a dimension of an image that is a correction target is prepared, and the CNN is applied in multiple stages to perform the ringing correction. For training the CNN, an image captured by increasing a measurement matrix size in one or two directions need only be used, thereby reducing an imaging time for acquiring training data and a burden of data processing, and enabling handling of images of various dimensions.

Claims14

Dependent claims

A magnetic resonance imaging apparatus comprising:

an imaging unit that collects measurement data consisting of magnetic resonance signals;
and
one or more processors that has a function of reconstructing the measurement data at a reconstruction matrix size different from a matrix size of the measurement data, and a function of correcting ringing of a reconstructed image,
wherein the one or more processors include a CNN that has been trained to obtain a ringing correction effect for a direction of a dimension lower than a dimension of the reconstructed image generated by the image generation unit, and are configured to change the matrix size by performing zero-filling of a high-frequency region in a one-dimensional direction or a two-dimensional direction on the measurement data and apply, in a real space, the CNN in multiple stages to the measurement data after the zero-filling to perform ringing correction.

1 more element

An image processing method of correcting a ringing artifact of a reconstructed image acquired by an MRI apparatus, the image processing method comprising:

a first size change step of performing zero-filling processing of a high-frequency region in a one-dimensional or two-dimensional direction on measurement data of the reconstructed image to generate second measurement data having a larger matrix size than the measurement data;
a first correction step of using a CNN that has been trained to obtain a ringing correction effect for a direction of a dimension lower than a dimension of the reconstructed image to perform, in a real space, ringing correction on the second measurement data for a direction in which the zero-filling processing is performed;
a second size change step of performing zero-filling of a high-frequency region in a direction orthogonal to the direction of the zero-filling processing in the first size change step on the second measurement data corrected in the first correction step to generate third measurement data having a larger matrix size than the second measurement data;
and
a second correction step of using the CNN to perform, in the real space, ringing correction on the third measurement data for the orthogonal direction.

2 more elements

Dependencies are inferred from the claim text.

Magnetic resonance imaging apparatus and image processing method

Life of this patent

Magnetic resonance imaging apparatus and image processing method

Life of this patent

Abstract

Claims14