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Cycle-Consistent Generative Adversarial Network: Effect on Radiation Dose Reduction and Image Quality Improvement in Ultralow-Dose CT for Evaluation of Pulmonary Tuberculosis

  • Chenggong Yan (Department of Medical Imaging Center, Nanfang Hospital, Southern Medical University) ;
  • Jie Lin (Department of Medical Imaging Center, Nanfang Hospital, Southern Medical University) ;
  • Haixia Li (Clinical and Technical Solution, Philips Healthcare) ;
  • Jun Xu (Department of Hematology, Nanfang Hospital, Southern Medical University) ;
  • Tianjing Zhang (Clinical and Technical Solution, Philips Healthcare) ;
  • Hao Chen (Jiangsu JITRI Sioux Technologies Co., Ltd.) ;
  • Henry C. Woodruff (The D-Lab, Department of Precision Medicine, GROW-School for Oncology and Developmental Biology, Maastricht University) ;
  • Guangyao Wu (The D-Lab, Department of Precision Medicine, GROW-School for Oncology and Developmental Biology, Maastricht University) ;
  • Siqi Zhang (Department of Medical Imaging Center, Nanfang Hospital, Southern Medical University) ;
  • Yikai Xu (Department of Medical Imaging Center, Nanfang Hospital, Southern Medical University) ;
  • Philippe Lambin (The D-Lab, Department of Precision Medicine, GROW-School for Oncology and Developmental Biology, Maastricht University)
  • 투고 : 2020.08.16
  • 심사 : 2020.12.21
  • 발행 : 2021.06.01

초록

Objective: To investigate the image quality of ultralow-dose CT (ULDCT) of the chest reconstructed using a cycle-consistent generative adversarial network (CycleGAN)-based deep learning method in the evaluation of pulmonary tuberculosis. Materials and Methods: Between June 2019 and November 2019, 103 patients (mean age, 40.8 ± 13.6 years; 61 men and 42 women) with pulmonary tuberculosis were prospectively enrolled to undergo standard-dose CT (120 kVp with automated exposure control), followed immediately by ULDCT (80 kVp and 10 mAs). The images of the two successive scans were used to train the CycleGAN framework for image-to-image translation. The denoising efficacy of the CycleGAN algorithm was compared with that of hybrid and model-based iterative reconstruction. Repeated-measures analysis of variance and Wilcoxon signed-rank test were performed to compare the objective measurements and the subjective image quality scores, respectively. Results: With the optimized CycleGAN denoising model, using the ULDCT images as input, the peak signal-to-noise ratio and structural similarity index improved by 2.0 dB and 0.21, respectively. The CycleGAN-generated denoised ULDCT images typically provided satisfactory image quality for optimal visibility of anatomic structures and pathological findings, with a lower level of image noise (mean ± standard deviation [SD], 19.5 ± 3.0 Hounsfield unit [HU]) than that of the hybrid (66.3 ± 10.5 HU, p < 0.001) and a similar noise level to model-based iterative reconstruction (19.6 ± 2.6 HU, p > 0.908). The CycleGAN-generated images showed the highest contrast-to-noise ratios for the pulmonary lesions, followed by the model-based and hybrid iterative reconstruction. The mean effective radiation dose of ULDCT was 0.12 mSv with a mean 93.9% reduction compared to standard-dose CT. Conclusion: The optimized CycleGAN technique may allow the synthesis of diagnostically acceptable images from ULDCT of the chest for the evaluation of pulmonary tuberculosis.

키워드

과제정보

The authors thank Xiaochen Huai, MM, Philips Healthcare, China, as well as Jin Qi, PhD, School of Information and Communication Engineering, University of electronic science and technology of China, for their support in this study.

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