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Related Experiment Video

Updated: Sep 11, 2025

Improved Registration of 3D CT Angiography with X-ray Fluoroscopy for Image Fusion During Transcatheter Aortic Valve Implantation

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Adamkiewicz artery visualisation using iterative model-based reconstruction in low-dose computed tomograpyhy (CT)

E J Chun¹, S R Kang², T H Nam¹

¹Department of Radiology, Seoul National University Bundang Hospital, South Korea.

Clinical Radiology

|August 12, 2025

Summary

A novel iterative model-based reconstruction (IMR) significantly improves artery of Adamkiewicz (AKA) visualization and image quality in low-dose CT angiography compared to existing methods.

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Published on: December 9, 2021

Area of Science:

Radiology
Medical Imaging
Computational Imaging

Background:

Low-dose computed tomography (CT) angiography is crucial for visualizing the artery of Adamkiewicz (AKA).
Iterative model-based reconstruction (IMR) is an emerging technique for image enhancement.
Comparative studies on IMR for AKA visualization are limited.

Purpose of the Study:

To compare image quality and AKA visualization.
Evaluate a novel knowledge-based IMR algorithm.
Assess performance against hybrid iterative reconstruction (iDose⁴) and filtered back projection (FBP) in low-dose CT.

Main Methods:

45 patients with aortic aneurysm/dissection underwent low-dose CT angiography.
Raw data were reconstructed using FBP, iDose⁴, and IMR.
Quantitative (SNR, CNR) and qualitative (AKA visualization score) analyses were performed by blinded observers.

Main Results:

IMR demonstrated significantly higher SNR and CNR than iDose⁴ and FBP (P<.05).
Qualitative analysis showed superior AKA visualization scores with IMR (3.6 ± 0.6) versus iDose⁴ (3.1 ± 0.8) and FBP (2.6 ± 0.8).
The prevalence of assessable AKA was highest with IMR (93.3%).

Conclusions:

The IMR algorithm offers superior image quality for low-dose CT angiography.
IMR significantly enhances artery of Adamkiewicz visualization.
This technique shows promise for improved diagnostic accuracy in vascular imaging.