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Evaluation of functional and metabolic tumor volume using voxel-wise analysis in childhood rhabdomyosarcoma.

Evaluation of functional and metabolic tumor volume using voxel-wise analysis in childhood rhabdomyosarcoma.

Authors :
Maennlin S
Chaika M
Gassenmaier S
Grimm R
Sparber-Sauer M
Fuchs J
Schmidt A
Ebinger M
Hettmer S
Gatidids S
Dittmann H
Schäfer JF
Source :
Pediatric radiology [Pediatr Radiol] 2023 Mar; Vol. 53 (3), pp. 438-449. Date of Electronic Publication: 2022 Nov 18.
Publication Year :
2023

Abstract

Background: Cross-sectional imaging-based morphological characteristics of pediatric rhabdomyosarcoma have failed to predict outcomes.<br />Objective: To evaluate the feasibility and possible value of generating tumor sub-volumes using voxel-wise analysis of metabolic and functional data from positron emission tomography/magnetic resonance imaging (PET/MR) or PET/computed tomography (CT) and MRI in rhabdomyosarcoma.<br />Materials and Methods: Thirty-four examinations in 17 patients who received PET/MRI or PET/CT plus MRI were analyzed. The volume of interest included total tumor volume before and after therapy. Apparent diffusion coefficients (ADC) and standard uptake values (SUV) were determined voxel-wise. Voxels were assigned to three different groups based on ADC and SUV: "viable tumor tissue," "intermediate tissue" or "possible necrosis." In a second approach, data were grouped into three clusters using the Gaussian mixture model. The ratio of these clusters to total tumor volume and changes due to chemotherapy were correlated with clinical and histopathological data.<br />Results: After chemotherapy, the proportion of voxels in the different groups changed significantly. A significant reduction of the proportion of voxels assigned to cluster 1 was found, from a mean of 36.4% to 2.5% (P < 0.001). There was a significant increase in the proportion of voxels in cluster 3 following chemotherapy from 24.8% to 81.6% (P = 0.02). The proportion of voxels in cluster 2 differed depending on the presence or absence of tumor recurrence, falling from 48% to 10% post-chemotherapy in the group with no tumor recurrence (P < 0.05) and from 29% to 23% (P > 0.05) in the group with tumor recurrence.<br />Conclusion: Voxel-wise evaluation of multimodal data in rhabdomyosarcoma is feasible. Our initial results suggest that the different distribution of sub-volumes before and after therapy may have prognostic significance.<br /> (© 2022. The Author(s).)

Details

Language :
English
ISSN :
1432-1998
Volume :
53
Issue :
3
Database :
MEDLINE
Journal :
Pediatric radiology
Publication Type :
Academic Journal
Accession number :
36399161
Full Text :
https://doi.org/10.1007/s00247-022-05540-2