Abstract
In retinoblastoma, accurate segmentation of ocular structure and tumor tissue is important when working towards personalized treatment. This retrospective study serves to evaluate the performance of multi-view convolutional neural networks (MV-CNNs) for automated eye and tumor segmentation on MRI in retinoblastoma patients. Forty retinoblastoma and 20 healthy-eyes from 30 patients were included in a train/test (N = 29 retinoblastoma-, 17 healthy-eyes) and independent validation (N = 11 retinoblastoma-, 3 healthy-eyes) set. Imaging was done using 3.0 T Fast Imaging Employing Steady-state Acquisition (FIESTA), T2-weighted and contrast-enhanced T1-weighted sequences. Sclera, vitreous humour, lens, retinal detachment and tumor were manually delineated on FIESTA images to serve as a reference standard. Volumetric and spatial performance were assessed by calculating intra-class correlation (ICC) and dice similarity coefficient (DSC). Additionally, the effects of multi-scale, sequences and data augmentation were explored. Optimal performance was obtained by using a three-level pyramid MV-CNN with FIESTA, T2 and T1c sequences and data augmentation. Eye and tumor volumetric ICC were 0.997 and 0.996, respectively. Median [Interquartile range] DSC for eye, sclera, vitreous, lens, retinal detachment and tumor were 0.965 [0.950–0.975], 0.847 [0.782–0.893], 0.975 [0.930–0.986], 0.909 [0.847–0.951], 0.828 [0.458–0.962] and 0.914 [0.852–0.958], respectively. MV-CNN can be used to obtain accurate ocular structure and tumor segmentations in retinoblastoma.
Highlights
In retinoblastoma, accurate segmentation of ocular structure and tumor tissue is important when working towards personalized treatment
Compared to the previously published stateof-the-art baseline model, which relies on a sequential pipeline combining Active Shape Models (ASMs) and a 2D U-Net, multi-view convolutional neural networks (MV-CNNs) showed better volumetric performance for both eye and tumor volume and spatial performance improved significantly for both eye and tumor segmentations
The purpose of the current work was to evaluate the performance of MV-CNN to provide a one-step solution for segmentation of ocular structures and tumor tissue on MR images in RB patients
Summary
Accurate segmentation of ocular structure and tumor tissue is important when working towards personalized treatment. This retrospective study serves to evaluate the performance of multi-view convolutional neural networks (MV-CNNs) for automated eye and tumor segmentation on MRI in retinoblastoma patients. MV-CNN can be used to obtain accurate ocular structure and tumor segmentations in retinoblastoma. Ocular structure and tumor segmentation is performed by using Active Shape Models (ASMs)[12,13,14,15] in combination with 2D or 3D U-Nets[11,14,15,16]. In contrast to above-mentioned ASM-based models, MV-CNN allows for multi-class segmentation of healthy and pathological ocular regions in a single step, without the need for feature engineering. We compared our results to an established ‘baseline’ model published in literature
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