Detection of low-contrast objects: experimental comparison of single- and multi-detector row CT with a phantom.

Détails

ID Serval
serval:BIB_25B220D76EB9
Type
Actes de conférence (partie): contribution originale à la littérature scientifique, publiée à l'occasion de conférences scientifiques, dans un ouvrage de compte-rendu (proceedings), ou dans l'édition spéciale d'un journal reconnu (conference proceedings).
Collection
Publications
Institution
Titre
Detection of low-contrast objects: experimental comparison of single- and multi-detector row CT with a phantom.
Titre de la conférence
RSNA 2002 Radiological Society of North America, 88th Scientific Assembly and Annual Meeting
Auteur⸱e⸱s
Verdun F.R., Denys A., Valley J.F., Schnyder P., Meuli R.A.
Adresse
McCormick Place, Chicago, Illinois, USA
ISBN
0033-8419
Statut éditorial
Publié
Date de publication
12/2002
Peer-reviewed
Oui
Volume
223
Pages
426-431
Langue
anglais
Notes
Publication types: Comparative Study ; Journal Article
Résumé
PURPOSE: To compare single-detector row computed tomography (CT) and multi-detector row CT by using an experimental phantom containing a contrast-detail modulus for detection of low-contrast structures to optimize acquisition protocols. MATERIALS AND METHODS: The parameters milliampere seconds, reconstructed section thickness, and elementary collimation for multi-detector CT were varied for two pitches with single- and multi-detector CT. For objective assessment of image quality, contrast-to-noise ratio (CNR) was calculated for an 8-HU low-contrast 15-mm-diameter object. Subjective assessment of image quality was performed by means of visual detection of low-contrast objects of various sizes by four independent observers. For each acquisition protocol, the effective doses required to obtain the CNR thresholds allowing 100% detection of 5-, 7-, and 9-mm-diameter objects were compared at single- and multi-detector CT at comparable section sensitivity profile with analysis of variance. RESULTS: Significant correlation was found between CNR measurements and subjective object detection (r = 0.95, P <.05). CNRs of 1.0, 0.8, and 0.6 were required to detect 100% of the 5-, 7-, and 9-mm-diameter objects, respectively. For reconstructed section thickness of 5-10 mm, comparable x-ray doses were required with single- and multi-detector CT to detect objects. For reconstructed sections thinner than 5 mm, single- and multi-detector CT allowed detection of only the 7- and 9-mm-thick objects, but a higher x-ray dose was required for multi- than for single-detector CT (P <.05). CONCLUSION: Multi-detector CT is less effective than single-detector CT in detection of small low-contrast objects if sections thinner than 5 mm are used. Results for single- and multi-detector CT were similar for sections 5 mm or thicker.
Mots-clé
Analysis of Variance, Observer Variation, Phantoms, Imaging, Sensitivity and Specificity, Tomography, X-Ray Computed/methods
Pubmed
Web of science
Création de la notice
06/01/2009 17:23
Dernière modification de la notice
20/08/2019 13:04
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