Method and device for determining ray segment attenuation coefficients, and ray attenuation calculation method

Abstract

The invention relates to a method and a device for determining the attenuation coefficients of ray segments formed by a multi-die body assembly, and a method for calculating ray attenuation caused by the multi-die body assembly. The method for determining the attenuation coefficient includes: acquiring intersection points formed when a ray passes through the multi-die body assembly; according to the direction along which the ray passes through the multi-die body assembly, determining the attenuation coefficients of the ray segments between each intersection point and a nearest intersection point therebehind. If the intersection points are incidence points, the attenuation coefficients of the ray segments are corresponding to properties of the intersection points; and if the intersection points are emitting points, the attenuation coefficients of the ray segments are corresponding to properties of the intersection points and properties of the intersection points before the mentioned intersection points. The device includes: an intersection point acquiring unit and an attenuation coefficient determination unit. The method for calculating the ray attenuation caused by the multi-die body assembly includes: determining the the attenuation coefficient of each ray segment formed by the multi-die body assembly; calculating the sub-attenuation of each ray segment; summing all the sub-attenuation to obtain the attenuation of the multi-die body assembly on the ray. Without foreseeing the geometrical relationship between die bodies, the attenuation coefficients of the ray segments can be determined.

Description

technical field [0001] The invention relates to the field of computer imaging, in particular to a method and device for determining the attenuation coefficient of a ray segment formed by a multi-phantom component, and a method for calculating the attenuation of a ray by a multi-phantom component. Background technique [0002] At present, computer imaging technology is widely used in medical detection, and the more commonly used ones include Electronic Computer X-ray Tomography Technique (CT), Magnetic Resonance Imaging (MRI) and so on. They all pass through the measured object through rays, and according to the different attenuation of the rays by each part of the measured object, the computer collects the transmitted rays and reconstructs the image. [0003] A phantom is a model of a real human body designed to verify the feasibility of an algorithm or system. In an imaging simulation system, phantoms can be actual physical models, or some objects in computer software, whi...

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Problems solved by technology

And using this method, once the geometric relationship of the phantom changes, it is necessary to redefine the corresponding phantom file, resulting in duplication of work for the staff

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