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| The effect of respiratory rate and pitch on chest CT image quality and radiation dose of children |
| BIAN Chuan-zhen, ZHANG Nan, LIU Peng |
| Children’s Hospital Affiliated to Nanjing Medical University, Nanjing 210000, China |
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Abstract Objective: To investigate the relationship between the respiratory rate and the scanning pitch when performing chest CT scan and evaluate their effect on image quality and radiation dose. Methods: Eighty-five patients were divided into group A and B randomly. According to their respiratory rate, patients in group A were divided into A1 and A2 group; patients in group B were divided into B1 and B2 group. In group A, high-pitch mode CT scan was performed; in group B, low-pitch mode CT scan was performed. The CTDIvol and DLP were recorded, and the image quality was evaluated subjectively and objectively. Results: Image quality of group A was better than that of group B; the difference was more obvious in A1 and B1 group; the CTDIvol was not significantly different in group A and group B, but the mean DLP value was 18.5% higher in group A than group B. Conclusion: Low-pitch mode CT scan was more suitable for low RRs patients when performing chest CT scan, that will reduce radiation dose while maintaining preferable image quality. Low-pitch mode CT scan was more suitable for low RRs patients when performing chest CT scan, which will reduce radiation dose while maintaining preferable image quality.
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Received: 27 July 2018
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