Japanese Journal of Radiological Technology
Online ISSN : 1881-4883
Print ISSN : 0369-4305
ISSN-L : 0369-4305
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Volume 67, Issue 1
Displaying 1-16 of 16 articles from this issue
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Opening Article
New Year Round Table Discussion
Original
  • Upper Gastrointestinal Study Using Onomatopoeic Sounds and Signs
    Hajime Nagao, Teruyo Hakoda, Eri Seido, Kenji Watanabe
    2011 Volume 67 Issue 1 Pages 15-24
    Published: November 25, 2009
    Released on J-STAGE: February 03, 2011
    DOIhttps://doi.org/10.6009/jjrt.67.15
    JOURNAL FREE ACCESS
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    We have made new instructions with onomatopoeic sounds and their own signs in order to improve the accuracy of the upper gastrointestinal study, and compared these new instructions with the conventional ones. After the examinations, we asked the patients to fill out a questionnaire regarding how they felt about the new instructions. In the esophagus X-ray fluoroscopy, the number of patients who took the proper amount of Barium meal showed a rate of increase of 31.6 percent compared to the conventional method. For the patients’ movements in the right rotation direction, the number of the patients showed a rate of increase of 18.2 percent using the oral instructions with onomatopoeic sounds, and 25.0 percent using the oral instruction with onomatopoeic sounds and signs. From the results of the questionnaire, 87.6 percent of the patients answered that the signs were “Effective” or “Very Effective.” Including the answer “Doesn’t Matter,” the sign instructions being useful increased to 94.8 percent of the patients. Ninety-four point eight percent of the patients answered that the oral instructions during this X-ray examination were “Easy To Understand” or “Very Easy To Understand.” With these results, I believe we should give the oral instructions using onomatopoeic sounds and signs.
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Note
  • Comparison of a Dental Cone Beam CT with a Multi-detector Row CT on Effective Doses and Physical Image Quality
    Yutaka Yoshida, Kenji Tokumori, Kazutoshi Okamura, Kazunori Yoshiura
    2011 Volume 67 Issue 1 Pages 25-31
    Published: November 25, 2009
    Released on J-STAGE: February 03, 2011
    DOIhttps://doi.org/10.6009/jjrt.67.25
    JOURNAL FREE ACCESS
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    The purpose of this study was to compare a dental cone beam computed tomography (dental CBCT) and a multi-detector row CT (MDCT) using effective doses and physical image quality. A dental mode (D-mode) and an implant mode (I-mode) were employed for calculating effective doses. Field of view (FOV) size of the MDCT was 150 mm. Three types of images were obtained using 3 different reconstruction functions: FC1 (for abdomen images), FC30 (for internal ear and bone images) and FC81 (for high resolution images). Effective doses obtained with the D-mode and with the I-mode were about 20% and 50% of those obtained with the MDCT, respectively. Resolution properties obtained with the D-mode and I-mode were superior to that of the MDCT in a high frequency range. Noise properties of the D-mode and the I-mode were better than those with FC81. It was found that the dental CBCT has better potential as compared with MDCT in both dental and implant modes.
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Clinical Technology
  • A Study of the Transport of Three Dimensional Medical Images to Remote Institutions for Telediagnosis
    Takashi Hayashi, Mitsuhiro Iwai, Katsuhiko Takahashi, Satoshi Takeda, ...
    2011 Volume 67 Issue 1 Pages 32-40
    Published: November 25, 2009
    Released on J-STAGE: February 03, 2011
    DOIhttps://doi.org/10.6009/jjrt.67.32
    JOURNAL FREE ACCESS
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    Using a 3D-imaging-create-function server and network services by IP-VPN, we began to deliver 3D images to the remote institution. An indication trial of the primary image, a rotary trial of a 3D image, and a reproducibility trial were studied in order to examine the practicality of using the system in a real network between Hakodate and Sapporo (communication distance of about 150 km). In these trials, basic data (time and receiving data volume) were measured for every variation of QF (quality factor) or monitor resolution. Analyzing the results of the system using a 3D image delivery server of our hospital with variations in the setting of QF and monitor resolutions, we concluded that this system has practicality in the remote interpretation-of-radiogram work, even if the access point of the region has a line speed of 6 Mbps.
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  • Basic Examination for Three-dimensional Phase-sensitive Inversion Recovery (3D PSIR) Method by Late Gadolinium Enhancement of Non-breath-hold Cardiac Magnetic Resonance Image
    Yoshinori Suzuki, Kunihiko Teraoka, Masashi Kawade, Kiyoshi Koizumi, Y ...
    2011 Volume 67 Issue 1 Pages 41-50
    Published: November 25, 2009
    Released on J-STAGE: February 03, 2011
    DOIhttps://doi.org/10.6009/jjrt.67.41
    JOURNAL FREE ACCESS
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    Purpose: We studied imaging parameters for the three-dimensional phase-sensitive inversion recovery by a late gadolinium enhancement (3D PSIR) method. Method: In the 3D PSIR method using a 1.5 Tesla MRI system and a polyvinyl alcohol (PVA) gel phantom, we evaluated the relation of the signal intensity at multiple inversion times (TI), 100–500 ms; flip angles (FA), 15–35°; and segments, 20–45. In 30 patients with chronic myocardial infarction, we measured and compared the late gadolinium enhancement (LGE) image area of ratio for each of 3 sections on both 3D LGE images by a non-breath hold and two-dimensional inversion recovery (2D IR) method non-breath hold. Result: In the 3D PSIR method, we recognized the signal intensity to make the width of step, maximum, and we recognized that the TI range, to keep the effective signal intensity difference constant, was limited on each phantom. The more this TI range decreased the bigger the difference in the FA and signal intensity. The set-up range of TI for the segment number remained the same. In the clinical setting, we recognized a good correlation between the 3D PSIR method (TI 300 ms, FA 20°) and the IR method (r=0.905, p<0.001). The imaging parameter that can be used in the clinical setting with the 3D PSIR method is FA 20° TI 200–300 ms, with the segment number adjusted by the cardiac cycle.
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  • Optimal Scan Timing in 64-Row MDCT Angiography of the Lower Extremities: 2-Point ROI Detection Bolus-Tracking Method
    Takaaki Kitai, Takasi Haraguchi
    2011 Volume 67 Issue 1 Pages 51-56
    Published: November 25, 2009
    Released on J-STAGE: February 03, 2011
    DOIhttps://doi.org/10.6009/jjrt.67.51
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    In CT angiography of the lower extremities, we have developed a 2-point ROI detection bolus-tracking method (2ROI-BTM) to provide the optimal contrast medium concentration and reduce contrast medium. The time to reach the ankle from the abdominal aorta was 22.5 s (95% central range, 14.6–40.1 s). The mean scan time was 13.6 s (range, 11.5–15.0 s). In the 2ROI-BTM (n=78), the mean CT number was 516 HU in the aorta, 427 HU in the popliteal artery, and 323 HU in the tibial artery. Compared with the TIM (n=66), the CT number was low in only 3% or less of cases, and the usual contrast medium dose of 20 ml for test injection could be reduced. With the 2ROI-BTM, the optimal scan timing can be determined more easily than with the TIM, allowing the contrast medium dose to be reduced by 26% and providing contrast enhancement with superior reproducibility of morphological characteristics for the generation of 3D images.
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Work in Progress
  • The Usefulness of the Adaptive Dose Shield for the Infant CT
    Hideyuki Kojima, Asuka Tsujimura, Hitoshi Yabe
    2011 Volume 67 Issue 1 Pages 57-61
    Published: November 25, 2009
    Released on J-STAGE: February 03, 2011
    DOIhttps://doi.org/10.6009/jjrt.67.57
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    The spiral scan with a wide detector row such as the 64-detector row computed tomography (CT) system may increase radiation exposure for infants because the irradiation range is wider than the planned range. The adaptive dose shield (ADS) prevents radiation exposure greater than the planned range. We examined the usefulness of the protection effect of the ADS for the infant inner ear CT. To confirm the protection effect of the ADS, we scanned X-ray films by using the 64-detector row CT system and measured the difference of the planned range and the irradiation range. The result of that is that when the planned range was small, the protection effect for the scan ending side was inferior to the scan starting side. And also, when the gantry rotation speed and pitch factor (PF) were high values, the protection effect was inferior to a low gantry rotation speed and low PF. There was a combination of gantry rotation speed and PF at which the protection effect decreases. Due to changes of the scanning direction and PF for the infant inner ear, the crystalline lens radiation exposure dose decreased from 11.89 mGy to 4.37 mGy. In conclusion, the ADS can reduce the radiation exposure dose of an adjacent organ. Therefore, it was thought that the ADS was a useful radiation exposure reduction function for infants in the 64-detector row CT system.
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