Patent ID: 9633480
Date: 2017-04-25
CPC Classifications: A61B,G06T,G16H

Claim:
1. A radiographic image analyzing device for analyzing a subject image obtained by radiographic imaging of a subject to estimate a body thickness distribution of the subject, the device comprising: an image obtaining unit for obtaining the subject image; a body thickness distribution modifying unit for receiving input of a virtual model having an estimated body thickness distribution and modifying the estimated body thickness distribution of the virtual model to output the modified estimated body thickness distribution, the body thickness distribution modifying unit comprising: a virtual model obtaining unit for obtaining the inputted virtual model having the estimated body thickness distribution, an estimated image generating unit for generating an estimated image, which is an estimate of a radiographic image that would be obtained by radiographic imaging of the subject, by combining an estimated primary ray image, which is an estimate of a primary ray image that would be obtained by radiographic imaging of the obtained virtual model, and an estimated scattered ray image, which is an estimate of a scattered ray image that would be obtained by radiographic imaging of the virtual model, and a modifying unit for modifying the obtained estimated body thickness distribution such that a difference between the estimated image and the subject image is reduced, and outputting the modified estimated body thickness distribution; and a body thickness distribution determining unit for controlling execution of a body thickness distribution modifying process that causes the modifying unit to modify the estimated body thickness distribution of the virtual model and output the modified estimated body thickness distribution, causes the virtual model obtaining unit to obtain the virtual model having the outputted estimated body thickness distribution inputted thereto, and causes the estimated image generating unit to generate the estimated image from the virtual model, wherein the body thickness distribution modifying process is iteratively executed until a termination condition is satisfied, and, if the termination condition is satisfied, the body thickness distribution determining unit determines the estimated body thickness distribution that is outputted by the body thickness distribution modifying process when the termination condition is satisfied to be used as the body thickness distribution of the subject, wherein the body thickness distribution determining unit comprises a judging unit for switching, according to a judgment condition, between a first control under which the body thickness distribution modifying process is iteratively executed until a first termination condition is satisfied and a second control under which the body thickness distribution modifying process is iteratively executed until a second termination condition that is different from the first termination condition is satisfied so that one of the first control and the second control is executed, the number of iterations of the body thickness distribution modifying process under the second control being smaller than the number of iterations of the body thickness distribution modifying process under the first control.