Inter-laboratory comparison of channelized hotelling observer computation.

Détails

ID Serval
serval:BIB_7A915F40AB56
Type
Article: article d'un périodique ou d'un magazine.
Collection
Publications
Institution
Titre
Inter-laboratory comparison of channelized hotelling observer computation.
Périodique
Medical physics
Auteur⸱e⸱s
Ba A., Abbey C.K., Baek J., Han M., Bouwman R.W., Balta C., Brankov J., Massanes F., Gifford H.C., Hernandez-Giron I., Veldkamp WJH, Petrov D., Marshall N., Samuelson F.W., Zeng R., Solomon J.B., Samei E., Timberg P., Förnvik H., Reiser I., Yu L., Gong H., Bochud F.O.
ISSN
2473-4209 (Electronic)
ISSN-L
0094-2405
Statut éditorial
Publié
Date de publication
07/2018
Peer-reviewed
Oui
Volume
45
Numéro
7
Pages
3019-3030
Langue
anglais
Notes
Publication types: Comparative Study ; Journal Article
Publication Status: ppublish
Résumé
The task-based assessment of image quality using model observers is increasingly used for the assessment of different imaging modalities. However, the performance computation of model observers needs standardization as well as a well-established trust in its implementation methodology and uncertainty estimation. The purpose of this work was to determine the degree of equivalence of the channelized Hotelling observer performance and uncertainty estimation using an intercomparison exercise.
Image samples to estimate model observer performance for detection tasks were generated from two-dimensional CT image slices of a uniform water phantom. A common set of images was sent to participating laboratories to perform and document the following tasks: (a) estimate the detectability index of a well-defined CHO and its uncertainty in three conditions involving different sized targets all at the same dose, and (b) apply this CHO to an image set where ground truth was unknown to participants (lower image dose). In addition, and on an optional basis, we asked the participating laboratories to (c) estimate the performance of real human observers from a psychophysical experiment of their choice. Each of the 13 participating laboratories was confidentially assigned a participant number and image sets could be downloaded through a secure server. Results were distributed with each participant recognizable by its number and then each laboratory was able to modify their results with justification as model observer calculation are not yet a routine and potentially error prone.
Detectability index increased with signal size for all participants and was very consistent for 6 mm sized target while showing higher variability for 8 and 10 mm sized target. There was one order of magnitude between the lowest and the largest uncertainty estimation.
This intercomparison helped define the state of the art of model observer performance computation and with thirteen participants, reflects openness and trust within the medical imaging community. The performance of a CHO with explicitly defined channels and a relatively large number of test images was consistently estimated by all participants. In contrast, the paper demonstrates that there is no agreement on estimating the variance of detectability in the training and testing setting.
Mots-clé
Image Processing, Computer-Assisted, Laboratories, Observer Variation, Tomography, X-Ray Computed, Uncertainty, channelized hotelling observer, computed tomography, image quality, intercomparison, model observers
Pubmed
Web of science
Création de la notice
03/05/2018 17:35
Dernière modification de la notice
20/08/2019 14:36
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