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01.05.2013 | Original Article

Model-based iterative reconstruction in pediatric chest CT: assessment of image quality in a prospective study of children with cystic fibrosis

verfasst von: Frédéric A. Miéville, Laureline Berteloot, Albane Grandjean, Paul Ayestaran, François Gudinchet, Sabine Schmidt, Francis Brunelle, François O. Bochud, Francis R. Verdun

Erschienen in: Pediatric Radiology | Ausgabe 5/2013

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Abstract

Background

The potential effects of ionizing radiation are of particular concern in children. The model-based iterative reconstruction VEO^TM is a technique commercialized to improve image quality and reduce noise compared with the filtered back-projection (FBP) method.

Objective

To evaluate the potential of VEO^TM on diagnostic image quality and dose reduction in pediatric chest CT examinations.

Materials and methods

Twenty children (mean 11.4 years) with cystic fibrosis underwent either a standard CT or a moderately reduced-dose CT plus a minimum-dose CT performed at 100 kVp. Reduced-dose CT examinations consisted of two consecutive acquisitions: one moderately reduced-dose CT with increased noise index (NI = 70) and one minimum-dose CT at CTDI_vol 0.14 mGy. Standard CTs were reconstructed using the FBP method while low-dose CTs were reconstructed using FBP and VEO. Two senior radiologists evaluated diagnostic image quality independently by scoring anatomical structures using a four-point scale (1 = excellent, 2 = clear, 3 = diminished, 4 = non-diagnostic). Standard deviation (SD) and signal-to-noise ratio (SNR) were also computed.

Results

At moderately reduced doses, VEO images had significantly lower SD (P < 0.001) and higher SNR (P < 0.05) in comparison to filtered back-projection images. Further improvements were obtained at minimum-dose CT. The best diagnostic image quality was obtained with VEO at minimum-dose CT for the small structures (subpleural vessels and lung fissures) (P < 0.001). The potential for dose reduction was dependent on the diagnostic task because of the modification of the image texture produced by this reconstruction.

Conclusions

At minimum-dose CT, VEO enables important dose reduction depending on the clinical indication and makes visible certain small structures that were not perceptible with filtered back-projection.

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Titel: Model-based iterative reconstruction in pediatric chest CT: assessment of image quality in a prospective study of children with cystic fibrosis
verfasst von: Frédéric A. Miéville
Laureline Berteloot
Albane Grandjean
Paul Ayestaran
François Gudinchet
Sabine Schmidt
Francis Brunelle
François O. Bochud
Francis R. Verdun
Publikationsdatum: 01.05.2013
Verlag: Springer-Verlag
Erschienen in: Pediatric Radiology / Ausgabe 5/2013
Print ISSN: 0301-0449
Elektronische ISSN: 1432-1998
DOI: https://doi.org/10.1007/s00247-012-2554-4

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Model-based iterative reconstruction in pediatric chest CT: assessment of image quality in a prospective study of children with cystic fibrosis