Optimum Total Scan Angle for Four-Projection Chest Digital Tomosynthesis to Detect Lung Nodules
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- HORI Kensuke
- Kitasato University Graduate School of Medical Sciences
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- DONG Juzhong
- Tsukuba Technology Co., Ltd.
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- OKAMOTO Hiromasa
- Department of Radiology, Kitasato University Hospital
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- MURAISHI Hiroshi
- Kitasato University Graduate School of Medical Sciences
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- SEKI Masashi
- Department of Radiology, Kitasato University Hospital
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- SAITO Norio
- Tsukuba Technology Co., Ltd.
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- Thet-Thet-LWIN
- Kitasato University Graduate School of Medical Sciences
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- HARA Hidetake
- Kitasato University Graduate School of Medical Sciences
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- WATANABE Takara
- Kitasato University Graduate School of Medical Sciences Department of Radiological Sciences, Tokyo Metropolitan University
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- HASHIMOTO Takeyuki
- Department of Medical Radiological Technology, Faculty of Health Science, Kyorin University
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- WANG Bo
- Tsukuba Technology Co., Ltd.
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- TAKEDA Tohoru
- Kitasato University Graduate School of Medical Sciences
Bibliographic Information
- Other Title
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- 肺結節検出における4方向デジタルトモシンセシスの最適・最大投影角に関する基礎的検討
- ハイ ケッセツ ケンシュツ ニ オケル 4 ホウコウ デジタルトモシンセシス ノ サイテキ ・ サイダイ トウエイカク ニ カンスル キソテキ ケントウ
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Abstract
<p>Tomosynthesis is a technique of limited-angle tomography, which improves the detectability of pulmonary nodules compared to conventional X-ray radiography and acquires images with lower exposure dose than CT. Conventional tomosynthesis requires 10 seconds to obtain 60 projections because of the mechanical motion, and it is difficult for patients to hold the breath. We have proposed 4-projection tomosynthesis that allows acquisition of images in less than 1 second and significant reduction of radiation exposure. In this study, the optimal total scan angle for 4-projection tomosynthesis was examined. A chest phantom with artificial nodules was imaged every 1 degree, and the tomosynthesis images were reconstructed using various projection angles by Back Projection. To assess adequate parameters for image data acquisition, quantitative measures such as contrast noise ratio (CNR) and artifact spread function (ASF) were used to analyze tomosynthetic images. In 4-projection tomosynthesis, narrower projection angle was associated with greater CNR, while depth resolution tended to improve with wider projection angle. Thus, the CNR and depth resolution are in a trade-off relationship. In 4-projection tomosynthesis, the optimum total scan angle was considered to be less than 24 degrees due to the effect of the slice interval used in clinical systems.</p>
Journal
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- Transactions of Japanese Society for Medical and Biological Engineering
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Transactions of Japanese Society for Medical and Biological Engineering 56 (6), 260-264, 2018-12-10
Japanese Society for Medical and Biological Engineering
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Keywords
Details 詳細情報について
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- CRID
- 1390564238100153088
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- NII Article ID
- 130007629769
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- NII Book ID
- AA11633569
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- ISSN
- 18814379
- 1347443X
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- NDL BIB ID
- 029600416
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- Text Lang
- ja
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- Data Source
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- JaLC
- NDL
- CiNii Articles
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- Abstract License Flag
- Disallowed