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Objective: In order to improve the convenience and reliability of the calibration procedure with respect to the quantitative aspects of PET scanners, we have been developing new methods that rely on the use of point-like radioactive sources. The aim of this study is to report the results of the application of the proposed method for obtaining the cross-calibration factors (CCFs) of a clinical PET...
The technology of three-dimensional (3-D) scene reconstruction is expected as applications of simulation, navigation, walk-through and so on. Besides, Segway®, a two-wheeled self-balancing electric vehicle, is being used in public facilities (e.g. airports, shopping centers, event sites). Therefore, it is beneficial to study applications using Segway. In this paper, we propose a method of 3-D scene...
It is desired to obtain three-dimensional shapes of teeth without extracting them physically in order to construct teeth database. In this paper, we propose a method for reconstructing three-dimensional shape of a tooth from the images acquired by a dental micro CT. First, initial contour of a tooth is obtained from an image in which the tooth is not buried in the bone and does not touch another tooth...
This paper presents a method for achieving high speed and high compression ratio of Huffman encoding by updating and optimizing the code word table. A shadow code word table is continuously reconstructed according to the frequency distribution of the currently encoded symbols and used to replace the active code word table in real-time, if the compression ratio degrades. Multiple-matches in a content...
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