Medical image processing device, medical image processing method, and non-transitory computer-readable storage medium
AssigneeCanon Kabushiki Kaisha
InventorManabu Teshigawara
Life of this patent
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Abstract
A medical image processing device according to an embodiment includes a processing circuit. The processing circuit is configured: to obtain an electron density function of an examined subject and information about a nuclide administered for the examined subject; to calculate a positron range kernel related to the examined subject, on the basis of the electron density function and the nuclide; and to reconstruct a Positron Emission Tomography (PET) image of the examined subject, on the basis of the positron range kernel.
Claims9
A medical image processing device comprising a processing circuit configured to:
- obtain an electron density function of an examined subject and information about a nuclide administered for the examined subject;
- calculate a positron range kernel related to the examined subject, on a basis of the electron density function and the nuclide, the positron range kernel being an expansion coefficient matrix when expanding a quantity of pairs of annihilation gamma rays generated at a voxel with respect to a quantity of positrons generated at a voxel;
- reconstruct a Positron Emission Tomography (PET) image of the examined subject, on a basis of the positron range kernel;
- calculate a detection probability matrix on a basis of detector geometric information;
- calculate a system matrix by calculating a product of the detection probability matrix and the positron range kernel;
- and
- reconstruct the PET image of the examined subject on a basis of the system matrix, wherein
- the quantity of pairs of annihilation gamma rays is
- ρ
- m
- =
- ∑
- i
- T
- mi
-
- λ
- i
- ,
- wherein
- ρm is the quantity of the pairs of annihilation gamma rays generated, Tmi is the positron range kernel, and λi is the quantity of the positrons generated.
A medical image processing method comprising:
- obtaining an electron density function of an examined subject and information about a nuclide administered for the examined subject;
- calculating a positron range kernel related to the examined subject, on a basis of the electron density function and the nuclide, the positron range kernel being an expansion coefficient matrix when expanding a quantity of pairs of annihilation gamma rays generated at a voxel with respect to a quantity of positrons generated at a voxel;
- reconstructing a Positron Emission Tomography (PET) image of the examined subject, on a basis of the positron range kernel;
- calculating a detection probability matrix on a basis of detector geometric information;
- calculating a system matrix by calculating a product of the detection probability matrix and the positron range kernel;
- and
- reconstructing the PET image of the examined subject on a basis of the system matrix, wherein
- the quantity of pairs of annihilation gamma rays is
- ρ
- m
- =
- ∑
- i
- T
- mi
-
- λ
- i
- ,
- wherein
- ρm is the quantity of the pairs of annihilation gamma rays generated, Tmi is the positron range kernel, and λi is the quantity of the positrons generated.
A non-transitory computer-readable storage medium storing instructions that, when executed by one or more processors of a computer, cause the computer to:
- obtain an electron density function of an examined subject and information about a nuclide administered for the examined subject;
- calculate a positron range kernel related to the examined subject, on a basis of the electron density function and the nuclide, the positron range kernel being an expansion coefficient matrix when expanding a quantity of pairs of annihilation gamma rays generated at a voxel with respect to a quantity of positrons generated at a voxel;
- reconstruct a Positron Emission Tomography (PET) image of the examined subject, on a basis of the positron range kernel;
- calculate a detection probability matrix on a basis of detector geometric information;
- calculate a system matrix by calculating a product of the detection probability matrix and the positron range kernel;
- and
- reconstruct the PET image of the examined subject on a basis of the system matrix, wherein
- the quantity of pairs of annihilation gamma rays is
- ρ
- m
- =
- ∑
- i
- T
- mi
-
- λ
- i
- ,
- wherein
- ρm is the quantity of the pairs of annihilation gamma rays generated, Tmi is the positron range kernel, and λi is the quantity of the positrons generated.
Dependencies are inferred from the claim text.