Task-Based Model Observer Assessment of A Partial Model-Based Iterative Reconstruction Algorithm in Thoracic Oncologic Multidetector CT.

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Version: Final published version
License: CC BY 4.0
Serval ID
serval:BIB_DDED921A6DBF
Type
Article: article from journal or magazin.
Collection
Publications
Institution
Title
Task-Based Model Observer Assessment of A Partial Model-Based Iterative Reconstruction Algorithm in Thoracic Oncologic Multidetector CT.
Journal
Scientific reports
Author(s)
Rotzinger D.C., Racine D., Beigelman-Aubry C., Alfudhili K.M., Keller N., Monnin P., Verdun F.R., Becce F.
ISSN
2045-2322 (Electronic)
ISSN-L
2045-2322
Publication state
Published
Issued date
07/12/2018
Peer-reviewed
Oui
Volume
8
Number
1
Pages
17734
Language
english
Notes
Publication types: Journal Article
Publication Status: epublish
Abstract
To investigate the impact of a partial model-based iterative reconstruction (ASiR-V) on image quality in thoracic oncologic multidetector computed tomography (MDCT), using human and mathematical model observers. Twenty cancer patients examined with regular-dose thoracic-abdominal-pelvic MDCT were retrospectively included. Thoracic images reconstructed using a sharp kernel and filtered back-projection (reference) or ASiR-V (0-100%, 20% increments; follow-up) were analysed by three thoracic radiologists. Advanced quantitative physical metrics, including detectability indexes of simulated 4-mm-diameter solid non-calcified nodules and ground-glass opacities, were computed at regular and reduced doses using a custom-designed phantom. All three radiologists preferred higher ASiR-V levels (best = 80%). Increasing ASiR-V substantially decreased noise magnitude, with slight changes in noise texture. For high-contrast objects, changing the ASiR-V level had no major effect on spatial resolution; whereas for lower-contrast objects, increasing ASiR-V substantially decreased spatial resolution, more markedly at reduced dose. For both high- and lower-contrast pulmonary lesions, detectability remained excellent, regardless of ASiR-V and dose levels, and increased significantly with increasing ASiR-V levels (all p < 0.001). While high ASiR-V levels (80%) are recommended to detect solid non-calcified nodules and ground-glass opacities in regular-dose thoracic oncologic MDCT, care must be taken because, for lower-contrast pulmonary lesions, high ASiR-V levels slightly change noise texture and substantially decrease spatial resolution, more markedly at reduced dose.
Keywords
Aged, Aged, 80 and over, Algorithms, Artifacts, Female, Humans, Male, Middle Aged, Multidetector Computed Tomography/methods, Pelvis/pathology, Phantoms, Imaging, Radiation Dosage, Radiographic Image Interpretation, Computer-Assisted/methods, Radiography, Thoracic/methods, Radionuclide Imaging/methods, Retrospective Studies, Signal-To-Noise Ratio
Pubmed
Web of science
Open Access
Yes
Create date
13/12/2018 9:16
Last modification date
17/10/2019 6:10
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