摘要:
A method is adapted for providing microstructural information of a biological target from a plurality of diffusion weighted MR images corresponding to a specific area of the biological target. Each of the diffusion weighted MR images is obtained using a respective q-space sampling vector and is sampled at a plurality of sample points thereof to obtain a group of diffusion weighted MR image data. The diffusion weighted MR image data are processed to obtain a spin distribution function from which the microstructural information of the biological target can be obtained.
摘要:
A method is adapted for providing microstructural information of a biological target from a plurality of diffusion weighted MR images corresponding to a specific area of the biological target. Each of the diffusion weighted MR images is obtained using a respective q-space sampling vector and is sampled at a plurality of sample points thereof to obtain a group of diffusion weighted MR image data. The diffusion weighted MR image data are processed to obtain a spin distribution function from which the microstructural information of the biological target can be obtained.
摘要:
A voxel-based transformation method includes: a) obtaining a MRI dataset in a subject space associated with subject voxel coordinates, subject sampling directions, and subject voxel spin amounts, and a dataset of a co-registration template associated with template voxel coordinates, each subject voxel coordinate corresponding to a template voxel coordinate according to a mapping function; b) through an inverse of the mapping function, obtaining subject voxel coordinates and a Jacobian matrix; and c) obtaining template voxel spin amounts, each being a function of a template sampling direction and a template voxel coordinate, using the Jacobian matrix and image data.
摘要:
A method of analyzing a diffusion-weighted magnetic resonance image is adapted to analyze an orientation distribution function ψ0 of nerve fibers at a vector in space. The method includes the following steps: (A) finding an orientation {circumflex over (μ)}a with the largest probability in the ODF ψ0; (B) maximizing a single fiber ODF ψ′; (C) analyzing the maximized single fiber ODF ψ′ to obtain quantitative information; (D) deducting the maximized single fiber ODF ψ′ obtained in step (B) from the entire ODF ψ0; and (E) stopping computation if the result obtained in step (D) is determined to be smaller than a predetermined value, and repeating steps (A), (B), (C), and (D) if otherwise.
摘要:
A method of analyzing a diffusion-weighted magnetic resonance image is adapted to analyze an orientation distribution function ψ0 of nerve fibers at a vector in space. The method includes the following steps: (A) finding an orientation {circumflex over (μ)}a with the largest probability in the ODF ψ0; (B) maximizing a single fiber ODF ψ′; (C) analyzing the maximized single fiber ODF ψ′ to obtain quantitative information; (D) deducting the maximized single fiber ODF ψ′ obtained in step (B) from the entire ODF ψ0; and (E) stopping computation if the result obtained in step (D) is determined to be smaller than a predetermined value, and repeating steps (A), (B), (C), and (D) if otherwise.
摘要:
A voxel-based transformation method includes: a) obtaining a MRI dataset in a subject space associated with subject voxel coordinates, subject sampling directions, and subject voxel spin amounts, and a dataset of a co-registration template associated with template voxel coordinates, each subject voxel coordinate corresponding to a template voxel coordinate according to a mapping function; b) through an inverse of the mapping function, obtaining subject voxel coordinates and a Jacobian matrix; and c) obtaining template voxel spin amounts, each being a function of a template sampling direction and a template voxel coordinate, using the Jacobian matrix and image data.