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CT enterography at 100 kVp with iterative reconstruction compared to 120 kVp filtered back projection: evaluation of image quality and radiation dose in the same patients

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Abstract

Purpose

To perform qualitative and quantitative comparison of images in same patients undergoing CT enterography (CTE) with 100 kVp iterative reconstruction and 120 kVp filtered back projection.

Methods

In this retrospective study, 50 consecutive patients who underwent imaging with 100 kVp and iterative reconstruction (100-IR) and had prior imaging with 120 kVp filtered back projection (120-FBP) were included. Subjective image quality parameters were evaluated by two independent and blinded readers, with higher score implying better image quality. We developed a quantitative measure of image sharpness by measuring edge-width of the psoas-fat interface. Image noise was measured as a standard deviation of attenuation measurement in the homogeneous region of the subcutaneous fat. Image sharpness and noise were measured and compared between 100-IR and 120-FBP acquisitions.

Results

There was approximately 33% lower radiation dose as estimated by CTDIvol with 100-IR compared to 120-FBP (9.95 vs. 15.0; p < 0.0001). There were no significant differences in overall image quality, bowel wall sharpness, and subjective assessment of noise and artifact between 100-IR and 120-FBP for both readers. Mesenteric vessel clarity score was significantly higher with 100-IR for 1 reader (4.34 vs. 4.04; p = 0.008), but not for the second reader. There was higher image sharpness (1.62 vs. 1.89; p < 0.0001) and higher image noise (14.4 vs. 13.2; p = 0.020) with 100-IR compared to 120-FBP acquisition.

Conclusions

CTE performed at 100 kVp with iterative reconstruction demonstrates dose reduction without significant impact on various measures of image quality when compared to conventional 120 kVp FBP.

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Acknowledgement

Dr. James Babb, PhD for assistance with statistical analysis.

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Authors and Affiliations

  1. Department of Radiology, New York University Langone Medical Center, 660 First Avenue, New York, NY, 10016, USA

    Evan Johnson, Alec J. Megibow, Natasha E. Wehrli & Hersh Chandarana

  2. Department of Radiology, Weill Cornell Medical College, New York, NY, USA

    Natasha E. Wehrli

  3. CT Collaborations R&D Siemens HealthCare, New York, NY, USA

    Thomas O’Donnell

Authors
  1. Evan Johnson
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  2. Alec J. Megibow
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Correspondence to Hersh Chandarana.

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Johnson, E., Megibow, A.J., Wehrli, N.E. et al. CT enterography at 100 kVp with iterative reconstruction compared to 120 kVp filtered back projection: evaluation of image quality and radiation dose in the same patients. Abdom Imaging 39, 1255–1260 (2014). https://doi.org/10.1007/s00261-014-0156-3

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  • DOI: https://doi.org/10.1007/s00261-014-0156-3

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