Iterative metal artifact reduction in aortic CTA after Onyx®-embolization.
Leena Lehti1,2, Marcus Söderberg3,4, Helena Mellander1,5
1Department of Clinical Sciences, Lund University, Lund, Sweden.
European Journal of Radiology Open
|September 18, 2020
Summary
Metal artifact reduction algorithms (iMAR) significantly improve CT angiography (CTA) diagnostic quality after Onyx® embolization. These advanced reconstructions restore image clarity, overcoming artifacts that previously limited diagnostic value.
Area of Science:
- Medical Imaging
- Interventional Radiology
- Image Reconstruction Algorithms
Background:
- Onyx® embolization is frequently used but causes significant artifacts in subsequent CT examinations.
- These artifacts severely degrade the diagnostic quality of CT angiography (CTA).
Purpose of the Study:
- To compare the diagnostic quality of tailored metal artifact reducing algorithms (iMAR) against standard reconstructions for CTA in patients treated with Onyx® embolization.
- To evaluate the effectiveness of iMAR in mitigating Onyx®-induced artifacts.
Main Methods:
- Twelve patients undergoing Dual Energy CTA post-Onyx® embolization were analyzed.
- Standard and eight iMAR-reconstructed datasets were compared for attenuation and noise levels near the embolization material.
- Subjective image quality and artifact severity were assessed by two blinded interventional radiologists.
Main Results:
- All iMAR reconstructions demonstrated reduced attenuation distortion compared to standard reconstructions.
- Interventional radiologists rated iMAR reconstructions as significantly better in image quality.
- iMAR effectively reduced artifacts caused by Onyx® embolization.
Conclusions:
- iMAR algorithms significantly reduce metal artifacts in CTA following Onyx® embolization.
- These algorithms can improve diagnostic quality, often converting non-diagnostic scans to acceptable diagnostic levels.
Keywords:
Computed tomographyDECT, Dual Energy Computed TomographyDLP, Dose Length ProductED, Effective DoseFOV, Field of ViewImage qualityIterative reconstruction algorithmsMetal artifact reductionOnyx® embolizationPACS, Picture Archiving and Communication SystemSD, Standard DeviationVMI, Virtual Monoenergetic ImagesiMAR, iterative Metal Artifact ReductionMore Related Videos
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