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Volume 17 (2000)
- Issue 3 Pages 113-
- Issue 2 Pages 55-
- Issue 1 Pages 7-
Volume 17, Issue 3
Displaying 1-7 of 7 articles from this issue
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Akira IWATA2000 Volume 17 Issue 3 Pages 113-117
Published: 2000
Released on J-STAGE: August 27, 2012
JOURNAL FREE ACCESSAn Electrical Medical Record (e-Karte) System will be developed. This system utilizes Medical Markup Language (MML) designed by electrical medical recording committee in Medical Information Society. It promotes medical information exchange that helps cooperation between hospitals. In this project, four cooperation systems are planned; (1) health check and medical treatment, (2) hospital and clinics, (3) hospital and pharmacies, (4) clinics and medical examination center. Experimental studies using the developed system will be done in several hospitals, clinics, pharmacies, visiting nurse station, and medical examination center from June,2001 to March,2002. The project details are open on the following URL. http://mars.elcom.nitech.ac.jp/ekarte/View full abstractDownload PDF (1856K) -
Yongbum LEE, Takeshi HARA, Hiroshi FUJITA2000 Volume 17 Issue 3 Pages 118-129
Published: 2000
Released on J-STAGE: August 27, 2012
JOURNAL FREE ACCESSTemplate matching based on genetic algorithm (GATM) we previously developed is a method to detect object(s) existing in a large searching area effectively. In this paper, we investigate the performance of the GATM method by two simulation studies. The first simulalion study was performed to investigate potential effectiveness of the GATM for search and detection of only a detection object put in the observed images. As a result of the first simulation, all objects were correctly detected by the GATM method with about only 10% of searching iterations required by conventional TM. In the second simulation study, by assuming that the GATM was used to detect nodules in chest helical CT images, the GATM was performed to detect multiple objects in an observed image. The performances of the GATM without sharing method, GATM with sharing method and conventional TM were compared. The result showed that the performance of the GATM with sharing was comparable to that of conventional TM, and was better than that of the GATM without sharing. Furthermore, we discussed about the characteristic of our GATM method. From the results of the two simulations, we concluded that the GATM method was effective to detect lung nodules in helical X -ray CT imagesView full abstractDownload PDF (8243K) -
Akihide YAMAMOTO, Masao MATSUMOTO, Yuji OGATA, Hideaki KUBOTA, Hidetak ...2000 Volume 17 Issue 3 Pages 130-137
Published: 2000
Released on J-STAGE: August 27, 2012
JOURNAL FREE ACCESSIn order to confirm image quality on mammographic X-ray units, an experimental method using a CdZnTe detector is tried. We attempt to measure subject contrasts which are the differences of X-ray spectra transmitted through ACR accreditation RMI 156 phantom (PMMA 45mm thickness) inserted Al objects (0.1-0.3mm thickness) and make a comparison between measured spectra and similar calculated spectra from other authors' spectra. According to analysis of those X-ray spectra that influence the subject contrasts, we confirm that modern mammographic X-ray units have high quality X-ray beams.View full abstractDownload PDF (1826K) -
Isamu TAKAI, Du-Yih TSAI, Masaru SEKIYA, Katsuyuki KOJIMA, Isao YAMADA ...2000 Volume 17 Issue 3 Pages 138-146
Published: 2000
Released on J-STAGE: August 27, 2012
JOURNAL FREE ACCESSMathematical morphology offers a unified and powerful approach to numerous image-processing problems. This paper presents a method for automated detection of clustered microcalcification in mammograms using mathematical morphology. The method employs only one structuring element to reduce processing time, together with a top-hat transformation acting as a high-pass filter. Moreover, in order to effectively and accurately detect real microcalcifications, operations of bandwidth enhancing, square-curve transfer function and postprocessing are also involved. The proposed method is tested with several mammograms to validate its effectiveness.View full abstractDownload PDF (5792K) -
Koichi CHIDA, Mototsugu NINOMIYA, Masayuki ZUGUCHI, Masahiro KOHZUKI, ...2000 Volume 17 Issue 3 Pages 147-151
Published: 2000
Released on J-STAGE: August 27, 2012
JOURNAL FREE ACCESSUsually, large V waves in a pulmonary capillary wedge pressure tracing are most often due to mitral valve regurgitation. However, the V wave is often increased in patients without mitral regurgitation. Several investigators have reported that a large V wave is dependent on left atrial compliance. Thus, we investigated the V wave pressure obtained by right heart catheterization and the size of left atrial excursion. (LAE) obtained by M-mode echocardiography using parasternal long-axis view. LAE used in this study were determined as follows: “LAE”=(“left atrial diameter at T of ECG”-“left atrial diameter at R of ECG” )/“maximum left atrial diameter”. The subjects comprised 60 patients with various forms of heart diseases. Correlation was reasonable between the V wave pressure and the size of LAE (r=-0.52, p<0.001). This study provides additional information regarding relationship between large V waves and mitral regurgitation.View full abstractDownload PDF (2263K) -
Suguha TSUTSUMI, Masaki ABE, Takeo SOMEYA, Toru MATSUMOTO2000 Volume 17 Issue 3 Pages 152-160
Published: 2000
Released on J-STAGE: August 27, 2012
JOURNAL FREE ACCESSThe purpose of this whole study is to find out how radiologists read clinical images by utilizing the eye movement analysis with an eye camera. As a preliminary study, the simple images generated by the personal computer on the CRT monitor were used. A circle with 1 cm diameter was selected as a signal to eliminatethe influences of the CRT grade and the observers' eyesight. The signal with various background noise and various locations on the CRT monitor was shown to the observers. In this study, the eye fixation records were analyzed under the conditions such as the fixation angle 2 degrees and fixation duration 100msec. The physician and radiological technologists working for the gastrointestinal examinations were selected as observers. As the result, every observer easily caught the perceptible signal in peripheral vision first and immediately caught it again in central vision. When the degraded images were shown, however, they started searching the signal and the eye fixation records were varied individually.View full abstractDownload PDF (4675K) -
Daisuke YAMAZAKI, Tomoko MATSUBARA, Takeshi HARA, Hiroshi FUJITA, Taku ...2000 Volume 17 Issue 3 Pages 161-166
Published: 2000
Released on J-STAGE: August 27, 2012
JOURNAL FREE ACCESSWe have been developing an automated classification method based on the analysis of fibroglandular breast tissue density for digital mammograms. In this study, the definition method of points for approximation by second curve on thoracic wall side of Dmg region and that of threshold for extraction of Dc region based on the variance histogram analysis were improved. The agreement rate between physicians and the improved computerized method was increased from 80% to 91%. This result indicates that our improved method is more effective for the computerized classification of mammograms based on fibroglandular breast tissue density.View full abstractDownload PDF (3431K)
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