Task-Based Image Quality Assessment Comparing Classical and Iterative Cone Beam CT Images on Halcyon
Cone Beam CT
image quality
iterative reconstruction
radiotherapy
task-based image quality assessment
Journal
Diagnostics (Basel, Switzerland)
ISSN: 2075-4418
Titre abrégé: Diagnostics (Basel)
Pays: Switzerland
ID NLM: 101658402
Informations de publication
Date de publication:
26 Jan 2023
26 Jan 2023
Historique:
received:
12
12
2022
revised:
10
01
2023
accepted:
14
01
2023
entrez:
11
2
2023
pubmed:
12
2
2023
medline:
12
2
2023
Statut:
epublish
Résumé
Despite the development of iterative reconstruction (IR) in diagnostic imaging, CBCT are generally reconstructed with filtered back projection (FBP) in radiotherapy. Varian medical systems, recently released with their latest Halcyon To assess the image quality of radiotherapy CBCT images reconstructed with FBP and an IR algorithm. Three CBCT acquisition modes (head, thorax and pelvis large) available on a Halcyon The noise magnitude and the spatial frequency of the NPS peak was lower with IR than with FBP for all modes. For all low and high-contrast inserts, the values for TTF at 50% were higher with IR than with FBP. For all inserts and all modes, the contrast values were similar with FBP and IR. For all low and high-contrast simulated lesions, d' values were higher with IR than with FBP for all modes. These results were also found on the 6 patients where the images were less noisy but smoother with IR-CBCT. Using the IR algorithm for CBCT images in radiotherapy improve image quality and thus could increase the accuracy of online registration and limit positioning errors during processing.
Sections du résumé
BACKGROUND
BACKGROUND
Despite the development of iterative reconstruction (IR) in diagnostic imaging, CBCT are generally reconstructed with filtered back projection (FBP) in radiotherapy. Varian medical systems, recently released with their latest Halcyon
PURPOSE
OBJECTIVE
To assess the image quality of radiotherapy CBCT images reconstructed with FBP and an IR algorithm.
METHODS
METHODS
Three CBCT acquisition modes (head, thorax and pelvis large) available on a Halcyon
RESULTS
RESULTS
The noise magnitude and the spatial frequency of the NPS peak was lower with IR than with FBP for all modes. For all low and high-contrast inserts, the values for TTF at 50% were higher with IR than with FBP. For all inserts and all modes, the contrast values were similar with FBP and IR. For all low and high-contrast simulated lesions, d' values were higher with IR than with FBP for all modes. These results were also found on the 6 patients where the images were less noisy but smoother with IR-CBCT.
CONCLUSIONS
CONCLUSIONS
Using the IR algorithm for CBCT images in radiotherapy improve image quality and thus could increase the accuracy of online registration and limit positioning errors during processing.
Identifiants
pubmed: 36766553
pii: diagnostics13030448
doi: 10.3390/diagnostics13030448
pmc: PMC9914039
pii:
doi:
Types de publication
Journal Article
Langues
eng
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