The present invention provides a method for constructing a contour image with excellent precision by using nuclear medical image projection data of a subject. Pixel values are binarized through a threshold method by using nuclear medical projection data of a subject, which is not processed with scattering correction and absorption correction, and then contour data is extracted. A reconstructed image is obtained by processing the contour data with image reconstruction after processing the contour data with interpolation, if necessary. A contour image is obtained by processing the obtained, reconstructed image with second binarization.;COPYRIGHT KIPO 2014;[Reference numerals] (10) Outline video forming device;(100) Nuclear medicine video photographing device;(20) Data acquisition unit;(30) Sinogram writing unit;(40) First binarization processing unit;(50) Outline extracting unit;(60) Data interpolation processing unit;(70) Video reconstitution unit;(80) Second binarization processing unit;(90) Output unit
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