Value of Low-Dose CT Scans for Pelvic Injuries

Introduction: The aim of this study was to compare different low-dose computed tomography (CT) protocols with normal-dose CT scans and standard radiographic procedures used for consolidation control after pelvic fractures and to determine the future value of low-dose CT scans.

Material and Methods: We performed seven different CT protocols using two scanners with and without tin-filter technology and dual-energy capability, and four different radiographic examinations on various scanners. Dose was determined by using an Alderson phantom with 20 measuring sites. Additionally, the picture quality and clinical relevance was measured objectively and subjectively using a Likert scale.

Results: Tested low-dose CT protocols need just a little higher dose compared with standard radiographs in three planes (efficient dose 1.0–1.4 mSv versus 0.9–1.4 mSv). With the newest radiographic technology, the dose can be lowered to 0.6 mSv. Although normal-dose CT protocols (up to 9 mSv) are essential for the initial diagnostic imaging of pelvic fractures, low-dose CT scans can contribute to better consolidation control compared with conventional radiographic studies. Using CT-tin filter technology can help reduce dose even further or improve image quality.

Conclusion: Low-dose CTs of the pelvis are a good alternative for consolidation control of pelvic fractures, due to their better delineation compared with radiographs. Although dose is slightly higher in low-dose CT examinations, the higher clinical value outweighs this drawback.