A Multimodal Dense Parallel Global Attention Mechanism for Brain Tumor Image Segmentation.

Overview

1. School of New Energy and Power Engineering, Lanzhou Jiaotong University, Lanzhou 730070, China

Abstract

Brain tumor segmentation from 3D MRI presents significant challenges due to small lesion sizes, ambiguous boundaries, arbitrary spatial distributions, and heterogeneous morphological properties. To tackle these issues, this paper presents a fully automatic 3D brain tumor segmentation network that integrates morphological and anatomical information under a multi-task learning framework for whole tumor, tumor core, and enhanced tumor segmentation. We propose a multimodal feature fusion module to adaptively weight features from four MRI modalities (T1, T1ce, T2, FLAIR), enabling discriminative information integration and helping reduce modality intensity discrepancy and data imbalance. Furthermore, a ConvReXt downsampling module is introduced to preserve fine-grained semantic details by reducing information loss caused by conventional pooling. A dense parallel global attention module is also developed to capture both local details and long-range dependencies, addressing the limited receptive field of standard convolutions. Extensive experiments on the BraTS2020 dataset show that the proposed model obtains average Dice coefficients of 92.54%, 89.21%, and 86.54% for whole tumors, tumor cores, and enhanced tumors. The proposed model achieves competitive performance compared with state-of-the-art methods including nnFormer, validating that it can effectively fuse multimodal and multi-scale features and improve brain tumor segmentation accuracy.

Reproduced under the paper's license (CC BY), from the paper cited above.

Code

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Data

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Data Availability Statement

The BraTS 2020 dataset used in this study is publicly available at https://www.med.upenn.edu/cbica/brats2020/ (accessed on 15 July 2025). The code supporting the findings of this study is available from the corresponding author upon reasonable request.

Reproduced under the paper's license (CC BY), from the paper cited above.

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Version 1, 27 September 2026: the first record

Recorded: type, language, journal, volume, issue, pages, dates, 2 authors, 4 keywords, 3 funders, 14 references.

Cite

This paper

Xu, Z., & Qiao, R. (2026). A Multimodal Dense Parallel Global Attention Mechanism for Brain Tumor Image Segmentation. Journal of imaging, 12(6), 255. https://doi.org/10.3390/jimaging12060255

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