Japanese Journal of Radiological Technology
Online ISSN : 1881-4883
Print ISSN : 0369-4305
ISSN-L : 0369-4305
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Volume 67, Issue 2
Displaying 1-6 of 6 articles from this issue
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  • Study of a New Axial Projection of Shoulder Joint without Abduction of Upper Extremity
    Kanji Takahashi, Kyouichi Kato, Hideki Ishida, Shougo Sai, Yasuo Nakaz ...
    2011 Volume 67 Issue 2 Pages 137-144
    Published: February 25, 2011
    Released on J-STAGE: March 29, 2011
    DOIhttps://doi.org/10.6009/jjrt.67.137
    JOURNAL FREE ACCESS
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    A study of a method of taking X-rays of the shoulder joint axis when the upper arm is fixed and cannot be rotated. When the shoulder joint has suffered damage, rotating the arm can be very painful, and obtaining accurate images of the axis is frequently difficult. For this reason, at this hospital, the Stockinette-Velpeau procedure is used on patients who cannot rotate their arms to have X-rays taken. In this procedure, the patient bends backwards at a 40-degree angle, and an X-ray of the shoulder joint axis is taken from directly below the joint. Using this method, even if the upper arm is hanging down, information regarding the direction of the axis can be obtained. However, maintaining this body position is difficult and requires assistance. The patient may also experience pain. For this reason, a new method was sought of X-raying the axis from a body position that is easier on the patient and by which diagnostic information on the axis direction can be obtained from patients who cannot rotate their upper arms. The result of seeking a new method was an X-ray that can be taken diagonally at a 25-degree angle relative to the shoulder joint socket. This X-ray method requires no rotation of the axis and provides the closest view of the axis. This new method suggests a way to X-ray the axis that is easy on patients even when the shoulder joint is damaged.
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Clinical Technology
  • Noninvasive Assessment of Coronary Artery with Substantial Contrast Volume Reduction Using 320-detector row Computed Tomography: A Feasibility Study
    Hiroyasu Maruo, Takashi Ueguchi, Chikako Tanaka, Keita Yamazaki, Sator ...
    2011 Volume 67 Issue 2 Pages 145-151
    Published: February 25, 2011
    Released on J-STAGE: March 29, 2011
    DOIhttps://doi.org/10.6009/jjrt.67.145
    JOURNAL FREE ACCESS
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    The recently introduced 320-detector row computed tomography (320-row CT) allows very fast volumetric acquisition of the entire heart. Because the total amount of contrast agent required for CT coronary angiography (CTCA) depends directly on the acquisition time, 320-row CTCA would substantially reduce the contrast agent dose. The objective of this retrospective study was to evaluate the feasibility of contrast volume reduction on 320-row CTCA compared with 64-detector row CTCA (64-row CTCA). We retrospectively reviewed consecutive 320- and 64-row CTCA data (16 eligible cases for each; administrated contrast volume, 20–24 ml for the former and 50–65 ml for latter) from a homogeneous patient population (age ≤ 81, body weight ≤ 67 kg, and heart rate ≤ 69 bpm). The two types of CTCA data were compared with respect to the successful rate of adequate intravascular contrast enhancement defined as the number of segments with attenuations of more than 250 HU divided by total number of coronary segments evaluated. Our dataset provided mean intravascular attenuation values of 320 and 404 HU on the 320- and 64-row CTCA, respectively. Although the attenuation values were statistically lower for the 320-row CTCA (P < 0.001), there was no significant difference in the successful rates of adequate intravascular contrast enhancement (rate of 0.98 for each; P > 0.05). We therefore conclude that 320-row CTCA is a feasible method of diagnostic imaging and is superior to 64-row CTCA because it uses less of the contrast medium.
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  • Comparison of Chest and Abdominal X-ray Radiation Dose and its Image Quality-A Multi-center Study
    Tomoyuki Uto, Akihiro Ishiyama, Hiroya Kimura, Yuji Katuragi, Toyokazu ...
    2011 Volume 67 Issue 2 Pages 152-161
    Published: February 25, 2011
    Released on J-STAGE: March 29, 2011
    DOIhttps://doi.org/10.6009/jjrt.67.152
    JOURNAL FREE ACCESS
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    While radiography provides us clinically valuable information, it increases the risk of radiation exposure. Previous studies have reported great variations in radiation doses among institutions. It is concerning that radiation doses will increase and vary greatly from institution to institution when digital radiographic modalities become more common. In the present study, we measured chest and abdominal radiation doses at 10 institutions that had X-ray digital imaging systems. Differences in radiation doses among the institutions were evaluated and compared with the previous reports. The image quality at the measured radiation doses were also evaluated. The doses were measured by the same dosimeter, and the image quality at a specific dose was evaluated using the standard deviation of the digital values and Wiener spectrum. Our results indicate that the difference in radiation among institutions was approximately five-fold at a maximum and smaller than the previous reports had indicated. The image quality was improved as the dose was increased. We considered the five-fold difference to be the result of variations in optimum image quality and associated radiation doses among institutions. In summary, evaluating the radiation dose along with the image quality is important to optimize the doses.
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