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Evaluation of Patient Positioning during Digital Tomosynthesis and Reconstruction Algorithms for Ilizarov Frames: A
Yuki Abe1, Makoto Shimada1, Yoshihiro Takeda1
1Department of Radiological Technology, Graduate School of Health Sciences, Okayama University, Okayama, Japan.
Strategies in Trauma and Limb Reconstruction
|December 28, 2020
Summary
Digital tomosynthesis can reduce metal artifacts from Ilizarov frames in X-rays. An optimized acquisition method and reconstruction algorithm improve bone visualization quality, minimizing repeat scans and patient discomfort.
Area of Science:
- Medical Imaging
- Orthopedic Surgery
- Radiology
Background:
- Metallic components in external fixators, like the Ilizarov frame, create artifacts on X-rays.
- These artifacts obscure bone detail, hindering accurate diagnosis and treatment monitoring.
Purpose of the Study:
- To evaluate digital tomosynthesis's effectiveness in reducing metal artifacts.
- To develop an optimal image acquisition and reconstruction method for Ilizarov frames.
Main Methods:
- A phantom study using an Ilizarov frame with varying rod distances and angles.
- Filtered backprojection image reconstruction with two algorithms: THICKNESS-- (CONTRAST4) and THICKNESS++ (METAL4).
- Peak signal-to-noise ratio (PSNR) used to assess bone structure visibility.
Main Results:
- Higher PSNR (improved visibility) was achieved with increased rod-to-bone distance and angle to the X-ray tube orbit.
- The THICKNESS-- (CONTRAST4) algorithm yielded better results than THICKNESS++ (METAL4).
Conclusions:
- An optimized tomosynthesis acquisition and reconstruction method can achieve image quality comparable to non-artifactual images.
- This method reduces the need for repeat imaging and uncomfortable patient positioning.
