Medical Imaging and Information Sciences
Online ISSN : 1880-4977
Print ISSN : 0910-1543
ISSN-L : 0910-1543
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Volume 30, Issue 2
Displaying 1-6 of 6 articles from this issue
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Invited Lecture
  • Development of hydroxyapatite thin film for dental implant
    Kazuhide OZEKI
    Article type: Invited Lecture
    2013 Volume 30 Issue 2 Pages 31-35
    Published: 2013
    Released on J-STAGE: June 08, 2013
    DOIhttps://doi.org/10.11318/mii.30.31
    JOURNAL FREE ACCESS
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    Hydroxyapatite (HA) is used as a biomaterial for artificial bone owing to its excellent osteoconductivity. The applications of HA are limited, however, because of its mechanical weakness. A composite of titanium and HA, which has a higher mechanical strength, has been developed for dental implants using coating techniques. Plasma spraying is one of the major coating techniques used for this purpose. However, this method may cause fractures occurring in film coatings due to thick coating with more than 40 μm. A radio frequency (RF) sputtering technique is a very attractive method because the coated film is a homogeneous thin film less than 1μm thick, exhibiting a high bonding strength to the substrate. This paper introduces the development of HA sputtered film and its application for the dental implant.
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  • Clinical Usefulness of Temporal Subtraction System for Lung Nodule Detection
    Takatoshi AOKI
    Article type: Invited Lecture
    2013 Volume 30 Issue 2 Pages 36-38
    Published: 2013
    Released on J-STAGE: June 08, 2013
    DOIhttps://doi.org/10.11318/mii.30.36
    JOURNAL FREE ACCESS
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    Temporal subtraction technique is one of the CAD methods in which a previous image is subtracted from a current image so that interval changes are enhanced. Several studies support the fact that this technique can improve the diagnostic accuracy of lung nodules on plain radiographs, but the effectiveness on thoracic CT has not been fully assessed. In this article, the clinical usefulness of this technique for lung nodule detection is discussed.
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Original Article
  • Improvement of CAD Scheme for Detection of Lacunar Infarcts on MR images By Using Template Matching
    Akiko ABE, Yoshikazu UCHIYAMA, Chisako MURAMATSU, Takeshi HARA, Junji ...
    Article type: Original Article
    2013 Volume 30 Issue 2 Pages 39-43
    Published: 2013
    Released on J-STAGE: June 08, 2013
    DOIhttps://doi.org/10.11318/mii.30.39
    JOURNAL FREE ACCESS
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    The detection of lacunar infarcts is important because their presence indicates an increased risk of severe cerebral infarction. However, their accurate identification is often hard because of the difficulty in distinguishing between lacunar infarcts and Virchow-Robin spaces. The purpose of this study is to improve our CAD scheme by using template matching for reduction of false positives (FPs) . Our database comprised 1,143 T1- and 1,143 T2-weighted images obtained from 132 patients. The proposed method was evaluated by using 2 hold cross validation method. As a result, 17.1％ of FPs were eliminated more by adding the template matching to our previous CAD scheme. Conclusively, the sensitivity of the detection of lacunar infarcts was 96.8％ (90／93) with 0.59 FP per slice image. Our improved CAD scheme would be useful in assisting radiologists for identifying lacunar infarcts in MR images.
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