Manual Versus Semiautomatic Segmentation of Soft-tissue Sarcomas on Magnetic Resonance Imaging: Evaluation of Similarity and Comparison of Segmentation Times

Overview

Journal Radiol Bras

Specialty Radiology

Date 2021 Jun 10

PMID 34108762

Citations 5

Authors

Fernando Carrasco Ferreira Dionisio

Larissa Santos Oliveira

Mateus de Andrade Hernandes

Edgard Eduard Engel

Paulo Mazzoncini de Azevedo-Marques

Marcello Henrique Nogueira-Barbosa

Affiliations

Soon will be listed here.

Abstract

Objective: To evaluate the degree of similarity between manual and semiautomatic segmentation of soft-tissue sarcomas on magnetic resonance imaging (MRI).

Materials And Methods: This was a retrospective study of 15 MRI examinations of patients with histopathologically confirmed soft-tissue sarcomas acquired before therapeutic intervention. Manual and semiautomatic segmentations were performed by three radiologists, working independently, using the software 3D Slicer. The Dice similarity coefficient (DSC) and the Hausdorff distance were calculated in order to evaluate the similarity between manual and semiautomatic segmentation. To compare the two modalities in terms of the tumor volumes obtained, we also calculated descriptive statistics and intraclass correlation coefficients (ICCs).

Results: In the comparison between manual and semiautomatic segmentation, the DSC values ranged from 0.871 to 0.973. The comparison of the volumes segmented by the two modalities resulted in ICCs between 0.9927 and 0.9990. The DSC values ranged from 0.849 to 0.979 for intraobserver variability and from 0.741 to 0.972 for interobserver variability. There was no significant difference between the semiautomatic and manual modalities in terms of the segmentation times ( > 0.05).

Conclusion: There appears to be a high degree of similarity between manual and semiautomatic segmentation, with no significant difference between the two modalities in terms of the time required for segmentation.

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