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Contribution of Organ-Based Tube Current Modulation to the Reduction of Lens Exposure Dose in Head 4D CT Imaging: A Phantom Study
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- Keisuke Nagamoto
- Department of Radiology, Hospital of the University of Occupational and Environmental Health , Japan, 1-1 Iseigaoka, Yahatanishi-Ku, Kitakyushu, Fukuoka , Japan
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- Ryo Watanabe
- Department of Radiology, Hospital of the University of Occupational and Environmental Health , Japan, 1-1 Iseigaoka, Yahatanishi-Ku, Kitakyushu, Fukuoka , Japan
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- Tomonori Kawachino
- Department of Radiology, Hospital of the University of Occupational and Environmental Health , Japan, 1-1 Iseigaoka, Yahatanishi-Ku, Kitakyushu, Fukuoka , Japan
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- Yoshitaka Ohishi
- Department of Radiology, Hospital of the University of Occupational and Environmental Health , Japan, 1-1 Iseigaoka, Yahatanishi-Ku, Kitakyushu, Fukuoka , Japan
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- Aina Yamamoto
- Department of Radiology, Hospital of the University of Occupational and Environmental Health , Japan, 1-1 Iseigaoka, Yahatanishi-Ku, Kitakyushu, Fukuoka , Japan
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- Takashi Moritake
- Department of Radiation Regulatory Research Group, National Institute of Radiological Sciences, Quantum Life and Medical Science Directorate, National Institute for Quantum and Radiological Science and Technology , 4-9-1 Anagawa, Inage-ku, Chiba , Japan
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- Shun-ichi Nihei
- Intensive Care Unit, Hospital of the University of Occupational and Environmental Health , Japan, 1-1 Iseigaoka, Yahatanishi-ku, Kitakyushu, Fukuoka , Japan
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- Masayuki Kamochi
- Intensive Care Unit, Hospital of the University of Occupational and Environmental Health , Japan, 1-1 Iseigaoka, Yahatanishi-ku, Kitakyushu, Fukuoka , Japan
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- Naoki Kunugita
- Department of Occupational and Community Health Nursing School of Health Sciences, University of Occupational and Environmental Health , Japan, 1-1 Iseigaoka, Yahatanishi-Ku, Kitakyushu, Fukuoka , Japan
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Description
<jats:title>Abstract</jats:title> <jats:p>The purpose of this study was to evaluate the effectiveness of organ effect modulation (OEM) in reducing the lens dose in 4D computed tomography (CT) of the head in volume-acquisition (NVA) mode. Six radiophotoluminescent dosemeters were placed on the head of a RANDO phantom. The doses absorbed by the organs and image noise change rate were determined. The lens doses without OEM (i.e. in the OEMoff case) were higher than those with the same target standard deviation and volume-computed tomography dose index (CTDIvol) as in the OEMoff case (p < 0.01). The image noise change rate was 11%. OEM reduced the lens dose during head 4D CT imaging in the NVA mode by 18%. Furthermore, the feasibility of lens dose reduction while ensuring sufficient image quality was confirmed under the condition in which OEM was employed with the same CTDIvol as in the OEMoff case.</jats:p>
Journal
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- Radiation Protection Dosimetry
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Radiation Protection Dosimetry 2022-09-03
Oxford University Press (OUP)
