Radiation dose reduction in pediatric great vessel stent computed tomography using iterative reconstruction: A phantom study

by Annemarie M. den Harder, Dominika Suchá, Pieter J. van Doormaal, Ricardo P. J. Budde, Pim A. de Jong, Arnold M. R. Schilham, Johannes M. P. J. Breur, Tim Leiner

Background

To study dose reduction using iterative reconstruction (IR) for pediatric great vessel stent computed tomography (CT).

Methods

Five different great vessel stents were separately placed in a gel-containing plastic holder within an anthropomorphic chest phantom. The stent lumen was filled with diluted contrast gel. CT acquisitions were performed at routine dose, 52% and 81% reduced dose and reconstructed with filtered back projection (FBP) and IR. Objective image quality in terms of noise, signal-to-noise ratio (SNR) and contrast-to-noise ratio (CNR) as well as subjective image quality were evaluated.

Results

Noise, SNR and CNR were improved with IR at routine and 52% reduced dose, compared to FBP at routine dose. The lowest dose level resulted in decreased objective image quality with both FBP and IR. Subjective image quality was excellent at all dose levels.

Conclusion

IR resulted in improved objective image quality at routine dose and 52% reduced dose, while objective image quality deteriorated at 81% reduced dose. Subjective image quality was not affected by dose reduction.

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