Japanese Journal of Radiological Technology
Online ISSN : 1881-4883
Print ISSN : 0369-4305
ISSN-L : 0369-4305
Volume 78, Issue 3
Displaying 1-8 of 8 articles from this issue
Opening Article
Clinical Technologies
  • Masato Mizui, Yuji Mizoguchi, Takao Tashiro
    2022 Volume 78 Issue 3 Pages 257-262
    Published: March 20, 2022
    Released on J-STAGE: March 20, 2022
    JOURNAL FREE ACCESS

    Purpose: The effects of obesity, including metabolic syndrome, on health are of concern around the world. In Japan, if the abdominal circumference of a man is 85 cm or more and the abdominal circumference of a woman is 90 cm or more, the visceral fat area is equivalent to 100 cm2 or more. The evaluation of visceral fat by abdominal circumference is based on the influence of tissues other than visceral fat. The purposes of this study were to compare the abundance of visceral fat area and subcutaneous fat area and to examine the validity of estimating the visceral fat area by the abdominal circumference measurement method. Methods: We obtained data on visceral fat area, subcutaneous fat area, and abdominal circumference of 822 subjects. Next, we investigated the correlation between the abdominal circumference and the visceral fat area, the abdominal circumference and the subcutaneous fat area, and the visceral fat area and the subcutaneous fat area of the subjects. Result: The abdominal circumference and visceral fat area were highly correlated, but the sum of visceral fat area and subcutaneous fat area was more highly correlated. There was a low correlation between the visceral fat area and the subcutaneous fat area. When the abdominal circumference exceeded the standard value, there was no correlation between the visceral fat area and the subcutaneous fat area. We concluded that there is a correlation between abdominal circumference and BMI and visceral fat area, but when these are used for estimation of visceral fat area, they are not accurate due to many errors.

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  • Takahiro Sakamoto, Kenji Matsumoto, Masakazu Otsuka, Hidekazu Nanbu, M ...
    2022 Volume 78 Issue 3 Pages 263-269
    Published: March 20, 2022
    Released on J-STAGE: March 20, 2022
    JOURNAL FREE ACCESS

    Purpose: It is necessary to perform gantry quality assurance (QA) in high precision radiotherapy. However, the O-ring type linear accelerator (Halcyon) does not have a light field and laser as a reference of isocenter point. The aim of this study is to investigate the usefulness of a three-dimensional diode array detector for gantry angle QA, and an O-ring type linear accelerator. Method: The gantry angle and rotational center were verified using the ArcCHECK 3D diode array on the general linear accelerator (TrueBeam) as a reference and Halcyon. The gantry angles were measured at 0, 90, 180, and 270°. The accuracy of the gantry rotational center was evaluated using rotational irradiation in the clockwise and counterclockwise directions between 181° and 179°. Results: The QA system with ArcCHECK was able to apply on the TrueBeam and Halcyon. As a result of the accuracy of the gantry angle, the maximum error of value calculated from ArcCHECK was 0.1° compared with the nominal gantry angle of Halcyon. As a result of the accuracy of the gantry rotation isocenter of Halcyon, the distance between the isocenter and the gantry rotation center was 0.45 mm and 0.41 mm in the clockwise and counterclockwise directions, respectively. Conclusion: The QA system with ArcCHECK was useful for the gantry angle and the rotation center accuracy on the Halcyon.

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Data
  • Takumi Tanikawa, Ayako Yagahara, Akihisa Fukuda, Tatsuya Suzuki, Daisu ...
    2022 Volume 78 Issue 3 Pages 270-279
    Published: March 20, 2022
    Released on J-STAGE: March 20, 2022
    JOURNAL FREE ACCESS

    The image management function of picture archiving and communication system (PACS) plays a very important role while electronically preserving medical records. However, details of these mechanisms vary from manufacturer to manufacturer, which could be a problem if system specifications or image management functions are not confirmed by a user during system installation or operation. The purpose of this research was to record the differences in PACS settings and image data management in hospitals. A questionnaire survey was conducted in 261 hospitals having the PACS system in Hokkaido prefecture, Japan. Questionnaire contents consisted of a face sheet and the following two items: 1) PACS image deletion method, 2) rules regarding the PACS receiving an image of data that was already registered. Results of the questionnaire survey showed that the image deletion method in the PACS server, and the overwriting rule in case of existent images being re-transmitted to the server were different between different hospitals. Furthermore, these variations were not dependent on the vendors or manufacturers, but on the settings of each hospital. Since the image management method of PACS is not standardized, we were considered to be needed more attention and appropriate regulation for safe management of electronic medical records as per the national guideline.

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Segi Award
The 77th Annual Meeting of the Japanese Society of Radiological Technology Joint Public Lecture
Committee Report
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