Medical Imaging and Information Sciences
Online ISSN : 1880-4977
Print ISSN : 0910-1543
ISSN-L : 0910-1543
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Volume 15, Issue 3
Displaying 1-6 of 6 articles from this issue
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  • Significance of panoramic radiography in the diagnosis of jaw lesions
    Takeshi OHBA
    1998 Volume 15 Issue 3 Pages 124-134
    Published: October 08, 1998
    Released on J-STAGE: August 27, 2012
    DOIhttps://doi.org/10.11318/mii1984.15.124
    JOURNAL FREE ACCESS
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    The orthopantomograph, an apparatus for panoramic radiography of the jaws, was introduced by Paatero in 1954. It has been widely used, not only in dentistry but also in otorhinolaryngology, for the radiological diagnosis of jaw lesions. Many investigations have been reported its usefulness for the radiological examination of jaw lesions.
    The present report concerns the significance of the panoramic radiography in the diagnosis of jaw lesions. Panoramic radiographs obtained from the clinical cases were reviewed in this report. The value of the panoramic radiography in dental mass surveys, using a prototype panoramic x - ray machine the PTM 2001 modified for photofluorography, is also introduced.
    In 1995, the Japanese Ministry of Health Welfare began to examine the feasibility of periodontal disease examinations as a routine check up for the elderly. The PTM 2001 offered good possibilities with regard to periodontal examination of the elderly because of its low- radiation, short time needed, and low cost.
    This new panoramic radiography might be used for mass surveys or mass screenings of
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  • The Technology in the Digital HolographyTM System
    Chika HONDA, Shigeaki TAKAHASHI, S. J. HART, R. J. RANKIN
    1998 Volume 15 Issue 3 Pages 135-145
    Published: October 08, 1998
    Released on J-STAGE: August 27, 2012
    DOIhttps://doi.org/10.11318/mii1984.15.135
    JOURNAL FREE ACCESS
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    [in Japanese]
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  • A Method for Optimization of Fuzzy Reasoning using Genetic Algorithms and Its Application to Recognition of Medical Images
    Du-Yih TSAI, Shinji WATANABE, Katsuyuki KOJIMA, Norihiro TAKAGI, Masaa ...
    1998 Volume 15 Issue 3 Pages 146-151
    Published: October 08, 1998
    Released on J-STAGE: August 27, 2012
    DOIhttps://doi.org/10.11318/mii1984.15.146
    JOURNAL FREE ACCESS
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    We describe a method for optimizing the membership functions (MSF's) of fuzzy rules using genetic algorithms (GA's) and apply this GA - based fuzzy reasoning to discriminate heard diseases from echocardiograms. The method is to use Gaussian - distributed MSF's obtained from texture features of the echocardiograms. The standard deviations of the MSF's acting as parameters are optimized through training process using the GA. In the GA - based training, a two-step fitness function for selection phase is employed in order to increase the accuracy of the classification. The results of our experiments are very promising.
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  • Adaptive Comperssion Scheme for Multi-valued Images
    Seihaku HIGUCHI
    1998 Volume 15 Issue 3 Pages 152-158
    Published: October 08, 1998
    Released on J-STAGE: August 27, 2012
    DOIhttps://doi.org/10.11318/mii1984.15.152
    JOURNAL FREE ACCESS
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  • Efficient Detection of Esophageal Cancers by Using Digital Image Processing.
    The Application of Fluoroscopic Images with Video Input System
    Yuji OGATA, Sachi NISHIOKA, Yumiko HASHIDUME, Mituhiro MATSUMOTO, Shin ...
    1998 Volume 15 Issue 3 Pages 159-170
    Published: October 08, 1998
    Released on J-STAGE: August 27, 2012
    DOIhttps://doi.org/10.11318/mii1984.15.159
    JOURNAL FREE ACCESS
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    In order to detect esophageal cancers efficiently, we constructed a video input system with a personal computer. The first, images of fluoroscopy are recorded on S-VHS video tapes, and then these images are transferred to the computer for adding some image processing techniques. This system could be applied to most of the routine x-ray TV systems. It is true that fluoroscopic images of the x-ray TV are inferior to it's radiographic ones. We studied how to improve the less quality fluoroscopic images to be equal to radiographic images. For this purpose we used image processing techniques on pictures of the video fluoroscopic image. As the result, it would be beneficial for detection of small pathologic lesion. This trial was succeeded to improve the image quality and beneficial for detection of a small cancer lesion in esophagus. Efficient use of the fluoroscopic image on video tape and decrease of number of radiography at the examination will diminish the patient burden because radiation dose at the radiography is higher than that of the fluoroscopy. We believe our system will be widely used to the gastrointestinal examinations in near future.
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  • Elimination of False-positive Candidates by Dynamic Thresholding Technique in an Automated Detection of Clustered Microcalcifications
    Motohiro KATO, Hiroshi FUJITA, Takeshi HARA, Tokiko ENDO
    1998 Volume 15 Issue 3 Pages 171-178
    Published: October 08, 1998
    Released on J-STAGE: August 27, 2012
    DOIhttps://doi.org/10.11318/mii1984.15.171
    JOURNAL FREE ACCESS
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