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Sun W, Tan H, Wang Y, Xie A, Tan X, Liu P, Xu D, Huang F. Pulmonary CT scans of white rabbits using the selective photon shield technique of the third-generation dual-source CT. JOURNAL OF RADIOLOGICAL PROTECTION : OFFICIAL JOURNAL OF THE SOCIETY FOR RADIOLOGICAL PROTECTION 2022; 42:021527. [PMID: 35580575 DOI: 10.1088/1361-6498/ac7089] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 12/02/2021] [Accepted: 05/17/2022] [Indexed: 06/15/2023]
Abstract
This study aims to optimise the protocol for the low-dose pulmonary computed tomography (CT) scanning of infants by studying the effects of the selective photon shield (SPS) technique of the third-generation dual-source CT (DSCT) on the image quality and radiation dose of a chest CT in white rabbits under different tube currents. Twelve white rabbits of a similar weight to an infant were selected and randomly divided into an experimental group and a control group. The experimental groups (A1-A5) were scanned at low dose by the third-generation DSCT using SPS under different tube current × time (60, 50, 40, 30, and 20 mAs). The control group (B) was scanned under a conventional tube voltage (100 kV) and current × time (20 mAs). Advanced model iterative reconstruction at strength three was used for the objective and subjective evaluation of the image quality and radiation dose of the lung and mediastinal windows. With the standard deviation of the air in the trachea as image noise, the signal-to-noise ratio (SNR), contrast-to-noise ratio, and CT values of each site were evaluated. Radiation doses were compared using the volume CT dose index, dose length product, and effective dose. The differences in subjective image quality between groups A2 and B were not statistically significant (P= 0.34). The differences in the SNRs of the lung and mediastinal windows between groups A2 and B were not statistically significant (P> 0.05). The radiation dose of group A2 was 83.2% lower than that of group B. The SPS of the third-generation DSCT under 50 mAs might be applied in the pulmonary CT examination of infants.
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Affiliation(s)
- Wenjie Sun
- Department of Radiology, Hunan Provincial People's Hospital (First Affiliated Hospital of Hunan Normal University), No. 61, West Jiefang Road, Changsha, Hunan 410005, People's Republic of China
| | - Hui Tan
- Department of Radiology, Hunan Provincial People's Hospital (First Affiliated Hospital of Hunan Normal University), No. 61, West Jiefang Road, Changsha, Hunan 410005, People's Republic of China
| | - Yi Wang
- Department of Radiology, Hunan Provincial People's Hospital (First Affiliated Hospital of Hunan Normal University), No. 61, West Jiefang Road, Changsha, Hunan 410005, People's Republic of China
| | - An Xie
- Department of Radiology, Hunan Provincial People's Hospital (First Affiliated Hospital of Hunan Normal University), No. 61, West Jiefang Road, Changsha, Hunan 410005, People's Republic of China
| | - Xianzheng Tan
- Department of Radiology, Hunan Provincial People's Hospital (First Affiliated Hospital of Hunan Normal University), No. 61, West Jiefang Road, Changsha, Hunan 410005, People's Republic of China
| | - Peng Liu
- Department of Radiology, Hunan Provincial People's Hospital (First Affiliated Hospital of Hunan Normal University), No. 61, West Jiefang Road, Changsha, Hunan 410005, People's Republic of China
| | - Dan Xu
- Department of Radiology, Hunan Provincial People's Hospital (First Affiliated Hospital of Hunan Normal University), No. 61, West Jiefang Road, Changsha, Hunan 410005, People's Republic of China
| | - Feng Huang
- Department of Radiology, Hunan Provincial People's Hospital (First Affiliated Hospital of Hunan Normal University), No. 61, West Jiefang Road, Changsha, Hunan 410005, People's Republic of China
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