Purpose: To evaluate the differences in visualization of a normal appendix between regular-dose (RD) and low-dose (LD) unenhanced CT.
Material and methods: 179 patients underwent both RDCT and LDCT for urolithiasis. Two reviewers evaluated the appendiceal visualization on a three-point scale. Sensitivities and interobserver agreement were measured.
Results: There were no significant differences between RDCT and LDCT in sensitivity, regardless of the reviewer. Interobserver agreement was excellent in both RDCT and LDCT.
Conclusion: Unenhanced LDCT is a good tool for detecting a normal appendix and is also useful for less experienced interpreters who are unfamiliar with using LDCT images.
Keywords: Appendicitis; Appendix; Iterative reconstruction; Low-dose computed tomography; Radiation exposure.
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