Validation of the blurring of a small object on CT images calculated on the basis of three-dimensional spatial resolution
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- Okubo Masaki
- Department of Radiological Technology, School of Health Sciences, Faculty of Medicine, Niigata University
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- Wada Shinichi
- Department of Radiological Technology, School of Health Sciences, Faculty of Medicine, Niigata University
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- Saito Masatoshi
- Department of Radiological Technology, School of Health Sciences, Faculty of Medicine, Niigata University
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抄録
We determine three-dimensional (3D) blurring of a small object on computed tomography (CT) images calculated on the basis of 3D spatial resolution. The images were characterized by point spread function (PSF), line spread function (LSF) and slice sensitivity profile (SSP). In advance, we systematically arranged expressions in the model for the imaging system to calculate 3D images under various conditions of spatial resolution. As a small object, we made a blood vessel phantom in which the direction of the vessel was not parallel to either the xy scan-plane or the z-axis perpendicular to the scan-plane. Therefore, when scanning the phantom, non-sharpness must be induced in all axes of the image. To predict the image blurring of the phantom,3D spatial resolution is essential. The LSF and SSP were measured on our scanner, and two-dimensional (2D) PSF in the scan-plane was derived from the LSF by solving an integral equation. We obtained 3D images by convolving the 3D object-function of the phantom with both 2D PSF and SSP, corresponding to the 3D convolution. Calculated images showed good agreement with scanned images. Our technique of determining 3D blurring offers an accuracy advantage in 3D shape (size) and density measurements of small objects.
収録刊行物
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- Japanese Journal of Medical Physics
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Japanese Journal of Medical Physics 25 (3), 132-140, 2005
Japan Society of Medical Physics
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詳細情報 詳細情報について
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- CRID
- 1390001204673188864
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- NII論文ID
- 10016896560
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- NII書誌ID
- AA11580542
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- COI
- 1:STN:280:DC%2BD2MnosFClsg%3D%3D
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- NDL書誌ID
- 7740747
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- ISSN
- 13455354
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- PubMed
- 16373989
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- 本文言語コード
- en
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- データソース種別
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- JaLC
- NDL
- PubMed
- CiNii Articles
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- 抄録ライセンスフラグ
- 使用不可