Korean Journal of Radiology

  • 제22권11호
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  • Pages.1777-1785
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  • 2021
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  • 1229-6929(pISSN)
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  • 2005-8330(eISSN)
대한영상의학회 (The Korean Society of Radiology)
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Accurate Measurement of Agatston Score Using kVp-Independent Reconstruction Algorithm for Ultra-High-Pitch Sn150 kVp CT

  • Xi Hu (Department of Radiology, Sir Run Run Shaw Hospital, Zhejiang University School of Medicine) ;
  • Xinwei Tao (Siemens Healthineers China) ;
  • Yueqiao Zhang (Department of Radiology, Sir Run Run Shaw Hospital, Zhejiang University School of Medicine) ;
  • Zhongfeng Niu (Department of Radiology, Sir Run Run Shaw Hospital, Zhejiang University School of Medicine) ;
  • Yong Zhang (Department of Radiology, Sir Run Run Shaw Hospital, Zhejiang University School of Medicine) ;
  • Thomas Allmendinger (Computed Tomography-Research & Development, Siemens Healthcare GmbH) ;
  • Yu Kuang (Medical Physics Program, University of Nevada) ;
  • Bin Chen (Department of Radiology, Sir Run Run Shaw Hospital, Zhejiang University School of Medicine)
  • 투고 : 2021.01.20
  • 심사 : 2021.06.12
  • 발행 : 2021.11.01
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초록

Objective: To investigate the accuracy of the Agatston score obtained with the ultra-high-pitch (UHP) acquisition mode using tin-filter spectral shaping (Sn150 kVp) and a kVp-independent reconstruction algorithm to reduce the radiation dose. Materials and Methods: This prospective study included 114 patients (mean ± standard deviation, 60.3 ± 9.8 years; 74 male) who underwent a standard 120 kVp scan and an additional UHP Sn150 kVp scan for coronary artery calcification scoring (CACS). These two datasets were reconstructed using a standard reconstruction algorithm (120 kVp + Qr36d, protocol A; Sn150 kVp + Qr36d, protocol B). In addition, the Sn150 kVp dataset was reconstructed using a kVp-independent reconstruction algorithm (Sn150 kVp + Sa36d, protocol C). The Agatston scores for protocols A and B, as well as protocols A and C, were compared. The agreement between the scores was assessed using the intraclass correlation coefficient (ICC) and the Bland-Altman plot. The radiation doses for the 120 kVp and UHP Sn150 kVp acquisition modes were also compared. Results: No significant difference was observed in the Agatston score for protocols A (median, 63.05; interquartile range [IQR], 0-232.28) and C (median, 60.25; IQR, 0-195.20) (p = 0.060). The mean difference in the Agatston score for protocols A and C was relatively small (-7.82) and with the limits of agreement from -65.20 to 49.56 (ICC = 0.997). The Agatston score for protocol B (median, 34.85; IQR, 0-120.73) was significantly underestimated compared with that for protocol A (p < 0.001). The UHP Sn150 kVp mode facilitated an effective radiation dose reduction by approximately 30% (0.58 vs. 0.82 mSv, p < 0.001) from that associated with the standard 120 kVp mode. Conclusion: The Agatston scores for CACS with the UHP Sn150 kVp mode with a kVp-independent reconstruction algorithm and the standard 120 kVp demonstrated excellent agreement with a small mean difference and narrow agreement limits. The UHP Sn150 kVp mode allowed a significant reduction in the radiation dose.

키워드

과제정보

The authors gratefully acknowledge the supports by the Medical Health Science and Technology Project of Zhejiang Provincial Health Commission under Grant numbers 2021RC071.

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