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Comparison of Image Quality of Shoulder CT Arthrography Conducted Using 120 kVp and 140 kVp Protocols

  • Ahn, Se Jin (Department of Radiology, Seoul National University College of Medicine) ;
  • Hong, Sung Hwan (Department of Radiology, Seoul National University College of Medicine) ;
  • Chai, Jee Won (Department of Radiology, Boramae Medical Center) ;
  • Choi, Ja-Young (Department of Radiology, Seoul National University College of Medicine) ;
  • Yoo, Hye Jin (Department of Radiology, Seoul National University College of Medicine) ;
  • Kim, Sae Hoon (Department of Orthopedic Surgery, Seoul National University College of Medicine) ;
  • Kang, Heung Sik (Department of Radiology, Seoul National University College of Medicine)
  • Received : 2014.02.03
  • Accepted : 2014.07.23
  • Published : 2014.12.01

Abstract

Objective: To compare the image quality of shoulder CT arthrography performed using 120 kVp and 140 kVp protocols. Materials and Methods: Fifty-four CT examinations were prospectively included. CT scans were performed on each patient at 120 kVp and 140 kVp; other scanning parameters were kept constant. Image qualities were qualitatively and quantitatively compared with respect to noise, contrast, and diagnostic acceptability. Diagnostic acceptabilities were graded using a one to five scale as follows: 1, suboptimal; 2, below average; 3, acceptable; 4, above average; and 5, superior. Radiation doses were also compared. Results: Contrast was better at 120 kVp, but noise was greater. No significant differences were observed between the 120 kVp and 140 kVp protocols in terms of diagnostic acceptability, signal-to-noise ratio, or contrast-to-noise ratio. Lowering tube voltage from 140 kVp to 120 kVp reduced the radiation dose by 33%. Conclusion: The use of 120 kVp during shoulder CT arthrography reduces radiation dose versus 140 kVp without significant loss of image quality.

Keywords

References

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