Japanese Society Of Radiological Technology Research Articles

Cooperation of Japanese Society of Radiological Technology and Industry-Academia-Government Collaboration

Cooperation of Japanese Society of Radiological Technology and Industry-Academia-Government Collaboration

Participating in the 63rd Annual Scientific Congress of Japanese Society of Radiological Technology—A Student's View—

Participating in the 63rd Annual Scientific Congress of Japanese Society of Radiological Technology—A Student's View—

The Present Scientific Congress of The Japanese Society of Radiological Technology

The Present Scientific Congress of The Japanese Society of Radiological Technology

Announcement for The 35th Autumn Scientific Congress of Japanese Society of Radiological Technology

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Abstracts of The 35th Autumn Scientific Congress of Japanese Society of Radiological Technology

Abstracts of The 35th Autumn Scientific Congress of Japanese Society of Radiological Technology

Segmentation of the posterior ribs in chest radiographs using iterated contextual pixel classification

The task of segmenting the posterior ribs within the lung fields of standard posteroanterior chest radiographs is considered. To this end, an iterative, pixel-based, supervised, statistical classification method is used, which is called iterated contextual pixel classification (ICPC). Starting from an initial rib segmentation obtained from pixel classification, ICPC updates it by reclassifying every pixel, based on the original features and, additionally, class label information of pixels in the neighborhood of the pixel to be reclassified. The method is evaluated on 30 radiographs taken from the JSRT (Japanese Society of Radiological Technology) database. All posterior ribs within the lung fields in these images have been traced manually by two observers. The first observer's segmentations are set as the gold standard; ICPC is trained using these segmentations. In a sixfold cross-validation experiment, ICPC achieves a classification accuracy of 0.86 +/- 0.06, as compared to 0.94 +/- 0.02 for the second human observer.

Joint Symposium on Japanese Society of Radiological Technology and the Society of Photographic Science and Technology of Japan (Extract)

Joint Symposium on Japanese Society of Radiological Technology and the Society of Photographic Science and Technology of Japan (Extract)

診療放射線技師の学位取得に関する調査研究

This study attempted to clarify whether medical radiological technologists of the Japanese Society of Radiological Technology in Gunma sought to obtain Bachelor degrees and Master of Science degrees. In September 2005, a postal questionnaire survey was conducted on a sample of 153 technologists, and 68.0% (104/153) of the questionnaires were returned. The percentage of respondents who wished to obtain a degree was 25.0% (26/104) . The first reason for wishing to obtain a degree was to improve the quality of their work 47.8% (11/23) . Moreover, 28.8% (30/104) of respondents indicated a desire to obtain a master's degree. A total of 103 respondents indicated the subject they wished to study: 45.6% (47/103) indicated their own specific area, and 34.0% (35/103) indicated clinical psychology. The results of the survey showed that a high ratio of radiological technologists in Gunma would like to obtain an advanced degree. Even the radiological technologists who did not wish to obtain an advanced degree indicated their desire to continue in more specialized areas of radiology. The above investigation suggested some ways to implement lifelong education at the Gunma Prefectural College of Health Sciences.

The influence of liquid crystal display (LCD) monitors on observer performance for the detection of nodular lesions on chest radiographs

To access the influence of liquid crystal display (LCD) monitors on the detectability of nodular lesions depicted on chest radiographs by comparing them with a high-resolution cathode ray tube (CRT) monitor. Ten radiologists interpreted 247 soft-copy images on LCD monitors with pixel arrays of 1,024x1,280, 1,200x1,600, 1,536x2,048 and 2,048x2,560, and a CRT monitor with a pixel array of 2,048x2,560, and were asked to indicate their individual confidence levels regarding the presence of a nodule. These images were chest radiographs with and without a lung nodule from the "Standard Digital Image Database" created by the Japanese Society of Radiological Technology. The luminance distributions of all monitors were adjusted to the same, and the ambient illumination was 200 lux. Observer performance was analyzed in terms of the receiver-operating characteristics. No significant statistical differences in nodule detection performance were found among the four LCD monitors and the CRT monitor. The nodule detection performance on the LCD monitors with a spatial resolution higher than a matrix size of 1,024x1,280 was found to be equivalent to that on the high-resolution CRT monitor.

1. 基調講演 日本放射線技術学会の学術レベルの向上(学会の学術レベル向上のための提案とその問題点, 第60回総会学術大会シンポジウム)

1. 基調講演 日本放射線技術学会の学術レベルの向上(学会の学術レベル向上のための提案とその問題点, 第60回総会学術大会シンポジウム)

診断X線用線量計の相互比較における"不確かさ"の要因

Although patient exposure has been increasing in recent years, few institutions have dosimeters and are able to ascertain patients' exposure dose. Internationally, however, it is necessary to adopt safety levels for patient exposure doses, and guidance levels have been introduced. Therefore, the need for measurement in areas of x-ray diagnosis has been increasing. As a result, several societies concerned with radiation dose have been endeavoring to establish a calibration system of radiation measurement and a dosimeter calibration system, which are the basics of radiation protection. Ten regional centers for standardization of doses in x-ray diagnosis were established and have begun trials relating to dosimeter cross calibration. Our institution, as one of these centers, has instituted a trial. In this study, the cross-calibration field, the reliability of the cross-calibration skill of our regional center, and the standard uncertainty of cross calibration were investigated. As a consequence of the investigation, it was determined that our cross-calibration field follows the protocol of the Japanese Society of Radiological Technology, the difference between calibration factor/cross calibration factor obtained by JQA and our regional center is within 2.5%, and the expanded uncertainty of our cross calibration is about 7.2% (k=2).

Report on the 60th Congress of Japanese Society of Radiological Technology

Report on the 60th Congress of Japanese Society of Radiological Technology

Report on the 60th Congress of Japanese Society of Radiological Technology

Report on the 60th Congress of Japanese Society of Radiological Technology

Reports on the 59th Congress of Japanese Society of Radiological Technology

Reports on the 59th Congress of Japanese Society of Radiological Technology

Benefits and challenges of radiology information system

Benefits and challenges of radiology information system

Measurement of half-value layer in mammography

The half-value layer (HVL) of an X-ray beam for film-screen mammography is considered an important parameter for image quality and patient dose. Thus, HVL must be measured in accordance with The Manual of Accuracy for Mammography printed by the Japanese Society of Radiological Technology. The manual prescribes exactly the geometry of measurement, chamber position of measurement in the field, selection of chamber, and so on. However, the measurement of HVL is difficult in the actual clinical setting. This study examined the results of failure to perform the measurement of HVL in accordance with the manual for measuring HVL in the clinical setting. The investigation indicated that serious problems do not arise when measuring HVL for routine quality control even if the chamber in the field is not always set according to the manual and if a chamber for radiotherapy or diagnosis is used that is not recommended for soft X-ray by the manual.

第1回北海道・東京部会合同秋季大会に参加して

第1回北海道・東京部会合同秋季大会に参加して

The actual method for the information system construction considered as a radiological technologist's view: the needs and solution of Osaka University Hospital RIS/PACS reconstruction

The actual method for the information system construction considered as a radiological technologist's view: the needs and solution of Osaka University Hospital RIS/PACS reconstruction

An exchange between the Japanese Society of Radiological Technology and the Chinese Society of Radiological Technology

An exchange between the Japanese Society of Radiological Technology and the Chinese Society of Radiological Technology

第59回総会学術大会に参加して

第59回総会学術大会に参加して