Patent ID: 8193517
Filing Date: 2012-06-05
Classification: A61B,G01N

Abstract:
1. A fluoroscopy system comprising: a fluoroscopy apparatus including an illumination portion provided with a light source that radiates illumination light and excitation light, a fluorescence imaging portion that acquires a fluorescence image by imaging fluorescence generated at a subject, a return-light imaging portion that acquires a reference image by imaging return light returning from the subject, and an image-correcting unit that corrects the fluorescence image imaged by the fluorescence imaging portion by using the reference image acquired by the return-light imaging portion; a calibration device connected to the fluoroscopy apparatus and including a standard specimen and an observation-state setting mechanism that sets, in a variable manner, an observation distance and an observation angle of the fluoroscopy apparatus relative to the standard specimen; and an observation-conditions adjusting portion that adjusts observation conditions on the basis of the observation distance and the observation angle set by the calibration device and the fluorescence image and the reference image acquired by imaging the standard specimen with the fluoroscopy apparatus, wherein the observation-conditions adjusting portion calculates values a to d on the basis of the observation distance and the observation angle set by the calibration device and the fluorescence image and the reference image acquired by imaging the standard specimen with the fluoroscopy apparatus and adjusts the observation conditions so that ε=|ad−bc| becomes a prescribed threshold ε wherein the image-correcting unit performs the following processing: where FL FL A and B are constants, a is a value obtained by applying a power approximation to a characteristic of luminance versus distance from the illumination portion to the standard specimen, for the fluorescence image obtained by the fluorescence imaging portion when excitation light of a prescribed intensity is radiated towards the standard specimen, b is a value obtained by applying a power approximation to a characteristic of luminance versus cosine from the illumination portion to the standard specimen, for the fluorescence image obtained by the fluorescence imaging portion when excitation light of a prescribed intensity is radiated towards the standard specimen, c is a value obtained by applying a power approximation to a characteristic of luminance versus distance from the illumination portion to the standard specimen, for the reference image obtained by the return-light imaging portion when illumination light of a prescribed intensity is radiated towards the standard specimen, d is a value obtained by applying a power approximation to a characteristic of luminance versus cosine from the illumination portion to the standard specimen, for the reference image obtained by the return-light imaging portion when illumination light of a prescribed intensity is radiated towards the standard specimen, D D θ θ m and n are arbitrary constants that satisfy Expression (3), e (FL (FL when bc−ad=0, x and y are set from arbitrary real numbers that satisfy x:y=c:a=d:b.