| Autor: |
Horiba, Isao, Yanaka, Shigenchu, Iwata, Akira, Suzumura, Nobuo |
| Předmět: |
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| Zdroj: |
Systems & Computers in Japan; Jul86, Vol. 17 Issue 7, p19-29, 11p |
| Abstrakt: |
The X-ray CT has a high resolution with respect to the absorption coefficient, while its spatial resolution is inferior to other X-ray imaging technique. Consequently, the improvement of its spatial resolution is strongly desired. This paper theoretically analyzes the frequency component of the projection data, obtained by the third-generation CT system using a wide-angle fan beam. It is shown that the projection data contain the effective frequency component above the Nyquist frequency determined by the spacing between detectors. Then a new algorithm is proposed which utilizes that effective frequency component. The usefulness of the algorithm is examined by an experiment using a phantom and the human body. It is shown as a result that the new algorithm can realize spatial resolution corresponding to approximately twice the Nyquist frequency determined by the detector spacing. [ABSTRACT FROM AUTHOR] |
| Databáze: |
Supplemental Index |
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