Korean Journal of Radiology

The Korean Society of Radiology (대한영상의학회)
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Effect of Hybrid Kernel and Iterative Reconstruction on Objective and Subjective Analysis of Lung Nodule Calcification in Low-Dose Chest CT

  • Hong, Seul Gi (Department of Radiology, College of Medicine, Dong-A University) ;
  • Kang, Eun-Ju (Department of Radiology, College of Medicine, Dong-A University) ;
  • Park, Jae Hyung (Department of Radiology, College of Medicine, Dong-A University) ;
  • Choi, Won Jin (Department of Radiology, College of Medicine, Dong-A University) ;
  • Lee, Ki-Nam (Department of Radiology, College of Medicine, Dong-A University) ;
  • Kwon, Hee Jin (Department of Radiology, College of Medicine, Dong-A University) ;
  • Ha, Dong-Ho (Department of Radiology, College of Medicine, Dong-A University) ;
  • Kim, Dong Won (Department of Radiology, College of Medicine, Dong-A University) ;
  • Kim, Sang Hyeon (Department of Radiology, College of Medicine, Dong-A University) ;
  • Jo, Jeong-Hyun (Department of Radiology, College of Medicine, Dong-A University) ;
  • Lee, Jongmin (Department of Radiology, College of Medicine, Kyungpook National University)
  • Received : 2017.08.31
  • Accepted : 2018.03.02
  • Published : 2018.10.01
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Abstract

Objective: To evaluate the differences in subjective calcification detection rates and objective calcium volumes in lung nodules according to different reconstruction methods using hybrid kernel (FC13-H) and iterative reconstruction (IR). Materials and Methods: Overall, 35 patients with small (< 4 mm) calcified pulmonary nodules on chest CT were included. Raw data were reconstructed using filtered back projection (FBP) or IR algorithm (AIDR-3D; Canon Medical Systems Corporation), with three types of reconstruction kernel: conventional lung kernel (FC55), FC13-H and conventional soft tissue kernel (FC13). The calcium volumes of pulmonary nodules were quantified using the modified Agatston scoring method. Two radiologists independently interpreted the role of each nodule calcification on the six types of reconstructed images (FC55/FBP, FC55/AIDR-3D, FC13-H/FBP, FC13-H/AIDR-3D, FC13/FBP, and FC13/AIDR-3D). Results: Seventy-eight calcified nodules detected on FC55/FBP images were regarded as reference standards. The calcium detection rates of FC55/AIDR-3D, FC13-H/FBP, FC13-H/AIDR-3D, FC13/FBP, and FC13/AIDR-3D protocols were 80.7%, 15.4%, 6.4%, 52.6%, and 28.2%, respectively, and FC13-H/AIDR-3D showed the smallest calcium detection rate. The calcium volume varied significantly with reconstruction protocols and FC13/AIDR-3D showed the smallest calcium volume ($0.04{\pm}0.22mm^3$), followed by FC13-H/AIDR-3D. Conclusion: Hybrid kernel and IR influence subjective detection and objective measurement of calcium in lung nodules, particularly when both techniques (FC13-H/AIDR-3D) are combined.

Keywords

Acknowledgement

Supported by : Dong-A University

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