Diagnostic and Interventional Radiology
Abdominal Imaging - Original Article

Low tube voltage increases the diagnostic performance of dual-energy computed tomography in patients with acute appendicitis

1.

Clinic of Radiology, Ağrı State Hospital, Ağrı, Turkey

2.

Department of Radiology, Hacettepe University School of Medicine, Ankara, Turkey

Diagn Interv Radiol 2019; 25: 257-264
DOI: 10.5152/dir.2019.18567
Read: 93 Downloads: 30 Published: 03 September 2019

Abstract

 

PURPOSE

We aimed to assess the utility of dual-energy computed tomography (DECT) imaging in diagnosing acute appendicitis (AA) with density measurements of the appendix vermiformis.

 

METHODS

A total of 210 consecutive patients presenting with acute abdominal pain were scanned using DECT between January and October 2016. Twenty-six patients had pathologically confirmed AA, while 30 had normal appendices. Appendiceal densities were measured in the true axial section of the appendix vermiformis at 80 kVp, 140 kVp, virtual noncontrast, iodine overlay, mixed, and monoenergetic (40, 50, 60, 70, 80, 90, 100 keV) images.

 

RESULTS

Comparison of the appendix at different kVp and keV energy levels, virtual noncontrast, iodine overlay, and mixed images yielded significant differences between patients with appendicitis and those with a normal appendix (P < 0.001 for all). Receiver operating characteristic (ROC) curve analysis revealed that the 80 kVp image set yielded the best diagnostic performance among all image sets (area under the ROC curve [AUC], 0.996; P < 0.001), while 70 keV images yielded the highest diagnostic performance among the virtual monoenergetic image sets (AUC, 0.958; P < 0.001). Inter-rater agreement was good at 80 kVp images (intraclass correlation coefficient [ICC], 0.78, P < 0.001).

 

CONCLUSION

Evaluation of DECT image reconstructions suggested that low tube voltage with 80 kVp demonstrated accurate diagnostic performance for AA. This finding suggests that low kVp CT may be useful for diagnosing AA with reduced patient radiation exposure.

 

You may cite this article as: Topel Ç, Onur MR, Akpınar E, Karaosmanoğlu AD, Akata D, Karcaaltıncaba M. Low tube voltage increases the diagnostic performance of dual-energy computed tomography in patients with acute appendicitis. Diagn Interv Radiol 2019; 25:257–264.

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