Kazuma Nakazeko

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In this article, the authors propose an image registration program of portal images and digitally reconstructed radiography (DRR) images used as simulation images for external beam radiation therapy planning. First, the center of the radiation field in a portal image taken using a computed radiograhy cassette is matched to the center of the portal image.(More)
We present a computer assisted learning (CAL) program to simulate head radiography. The program provides cone beam projections of a target volume, simulating three-dimensional computed tomography (CT) of a head phantom. The generated image is 512 x 512 x 512 pixels with each pixel 0.6 mm on a side. The imaging geometry, such as X-ray tube orientation and(More)
Medical images are being recently reconstructed using several data sets. In x-ray and computed tomography (CT), 3-dimensional (3D) images are reconstructed using 2-dimensional (2D) projection data. Research regarding the image reconstruction method has been actively conducted. Further, 3D images include patient information and are used as diagnostic tools.(More)
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