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4D DSA reconstruction using tomosynthesis projections.

Marc Buehler¹, Jordan M Slagowski¹, Charles A Mistretta^1,2

¹Dept. of Medical Physics, University of Wisconsin, Madison, WI, USA.

Proceedings of Spie--The International Society for Optical Engineering

|September 26, 2017

Summary

Tomosynthesis in 4D Digital Subtraction Angiography (DSA) reduces vessel overlap artifacts in time-attenuation curves (TACs). This technique improves accuracy by utilizing non-overlapped rays and interpolation for enhanced vessel visualization.

Keywords:

4D DSA digital subtraction angiography scanning-beam digital x-ray time-attenuation tomosynthesis

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Four-Dimensional CT Analysis Using Sequential 3D-3D Registration

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Published on: November 23, 2019

Area of Science:

Medical Imaging
Radiology
Biomedical Engineering

Background:

4D Digital Subtraction Angiography (DSA) reconstructs time-resolved 3D angiographic volumes.
Vessel overlap in projections causes artifacts in time-attenuation curves (TACs), reducing accuracy.
Tomosynthesis offers a potential solution to mitigate these artifacts.

Purpose of the Study:

To investigate the efficacy of tomosynthesis in 4D DSA for improving the accuracy of reconstructed vessel TACs.
To reduce artifacts caused by vessel overlap using narrow-angle tomosynthesis datasets.
To assess the impact of non-overlapped rays and interpolation techniques on TAC accuracy.

Main Methods:

Utilized tomosynthesis projections, acquired via conventional C-arm rotation or scanning-beam digital x-ray (SBDX), within the 4D DSA framework.
Developed a method to ignore rays passing through multiple vessels, leveraging non-overlapped rays for temporal information.
Tested the technique in simulated scans of 2 mm vessels with varying separation and enhancement patterns.
Employed an image space interpolation technique to recover information in cases of full vessel overlap.

Main Results:

Standard 4D DSA exhibited significant overlap artifacts in TACs.
Tomosynthesis projections demonstrably reduced TAC artifacts caused by vessel overlap.
Artifact reduction was effective when a sufficient fraction of non-overlapped rays was available.
The interpolation technique successfully recovered information in scenarios with complete vessel overlap.

Conclusions:

Tomosynthesis is a valuable tool for enhancing the accuracy of 4D DSA by reducing vessel overlap artifacts.
The proposed method, incorporating non-overlapped rays and interpolation, improves the reliability of vessel TACs.
This advancement holds promise for more precise diagnosis and treatment planning in vascular imaging.