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Proceedings Paper

Basic study for automatic recognition of osteoporosis using abdominal x-ray CT images
Author(s): Sadamitsu Nishihara; Hiroshi Fujita; Tadayuki Iida; Atsushi Takigawa; Takeshi Hara; Xiangrong Zhou
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Paper Abstract

We have developed an algorithm that can be used to distinguish the central part of the vertebral body from an abdominal X-ray CT image and to automatically calculate three measures to diagnose the degree of osteoporosis in a patient. In addition, we examined whether it is possible to use these CT images as an aid in diagnosing osteoporosis. Three measures that were automatically extracted from the central part of a vertebral body in the CT images were compared with the bone mineral density (BMD) values that were obtained from the same vertebral body. We calculated the mean CT number, coefficient of variation, and the first moment of power spectrum in the recognized vertebral body. We judged whether a patient had osteoporosis using the diagnostic criteria for primary osteoporosis (Year 2000 revision, published by the Japanese Society for Bone and Mineral Research). We classified three measures for normal and abnormal groups using the principal component analysis, and the two groups were compared with the results obtained from the diagnostic criteria. As a result, it was found that the algorithm could be used to distinguish the central part of the vertebral body in the CT images and to calculate these measures automatically. When distinguishing whether a patient was osteoporotic or not with the three measures obtained from the CT images, the ratio (sensitivity) usable for diagnosing a patient as osteoporotic was 0.93 (14/15), and the ratio (specificity) usable for diagnosing a patient as normal was 0.64 (7/11). Based on these results, we believe that it is possible to utilize the measures obtained from these CT images to aid in diagnosing osteoporosis.

Paper Details

Date Published: 12 May 2004
PDF: 8 pages
Proc. SPIE 5370, Medical Imaging 2004: Image Processing, (12 May 2004); doi: 10.1117/12.534663
Show Author Affiliations
Sadamitsu Nishihara, Hiroshima Prefectural College of Health Sciences (Japan)
Hiroshi Fujita, Gifu Univ. (Japan)
Tadayuki Iida, Hiroshima Prefectural College of Health Sciences (Japan)
Atsushi Takigawa, Hiroshima Prefectural College of Health Sciences (Japan)
Takeshi Hara, Gifu Univ. (Japan)
Xiangrong Zhou, Gifu Univ. (Japan)


Published in SPIE Proceedings Vol. 5370:
Medical Imaging 2004: Image Processing
J. Michael Fitzpatrick; Milan Sonka, Editor(s)

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