Direct dose measurement of patients during pediatric computed tomography examination

DOI Web Site 参考文献12件
  • Hayashi Hiroaki
    Graduate School of Health Sciences, Tokushima University / College of Medical, Pharmaceutical and Health Sciences, Kanazawa University
  • Tomita Emi
    School of Health Sciences, Tokushima University / College of Medical, Pharmaceutical and Health Sciences, Kanazawa University
  • Goto Sota
    School of Health Sciences, Tokushima University / College of Medical, Pharmaceutical and Health Sciences, Kanazawa University
  • Kimoto Natsumi
    Graduate School of Health Sciences, Tokushima University / College of Medical, Pharmaceutical and Health Sciences, Kanazawa University
  • Tada Keiji
    Shimane University Faculty of Medicine
  • Kasai Ryosuke
    Tokushima University Hospital
  • Kanazawa Yuki
    Graduate School of Health Sciences, Tokushima University
  • Mihara Yoshiki
    Graduate School of Health Sciences, Tokushima University
  • Asahara Takashi
    Graduate School of Health Sciences, Tokushima University
  • Okazaki Tohru
    Nagase Landauer, Ltd.
  • Hashizume Takuya
    Nagase Landauer, Ltd.
  • Cruz Vergil Lorenzo E.
    Nagase Landauer, Ltd.

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説明

Even though various dose reduction techniques are applied on current computed tomography (CT) examination, patient dose is not measured. In this study, we measured the patient dose (surface dose) of neonates and infants and focused on using an optically stimulated luminescence (OSL) dosimeter to carry out the measurement since this dosimeter does not interfere with the medical image. For each CT examination, we applied a volumetric scanning technique in which we only needed one rotational scanning for obtaining an image within the length of 16 cm with 320 slices. First, using a neonate phantom, we examined the effect of placing patients at different positions on the measured doses. Second, we measured the patient dose using OSL dosimeters with thirteen dosimeters placed on each patient. During clinical CT examinations, exposure doses were automatically determined using an automatic exposure control system. In order to derive the differences of doses between patients and phantom, we examined the trend of values in which exposure doses were divided by the computed tomography dose index. We found that patient data showed a different trend when compared with the data obtained from the neonate phantom experiment. This result shows that this basic knowledge will be valuable in deciding proper irradiation conditions.

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