Automatic segmentation of the femur and tibia bones from X-ray images based on pure dilated residual U-Net

Weihao Shen; Wenbo Xu; Hongyang Zhang; Zexin Sun; Jianxiong Ma; Xinlong Ma; Shoujun Zhou; Shijie Guo; Yuanquan Wang

doi:10.3934/ipi.2020057

Article Contents

2021, Volume 15, Issue 6: 1333-1346. Doi: 10.3934/ipi.2020057 open access

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Automatic segmentation of the femur and tibia bones from X-ray images based on pure dilated residual U-Net

1.
School of Artificial Intelligence, Hebei University of Technology, Tianjin 300401, China
2.
Tianjin Institute of Orthopaedics, Tianjin Hospital, Tianjin University, Tianjin 300211, China
3.
Shenzhen Institutes of Advanced Technology, Chinese Academy of Sciences, Shenzhen 518055, China
4.
School of Artificial Intelligence, Hebei Key Laboratory of Robot Perception and Human-Robot Interaction, Hebei University of Technology, Tianjin 300401, China

^* Co-Corresponding author: Shoujun Zhou and Yuanquan Wang
^* Co-Corresponding author: Shoujun Zhou and Yuanquan Wang

^†These authors contribute equally to this paper

Received: November 30, 2019

Revised: April 30, 2020

Early access: August 2020

Published: December 2021

The first author is supported by NSFC grant 61976241

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Abstract

X-ray images of the lower limb bone are the most commonly used imaging modality for clinical studies, and segmentation of the femur and tibia in an X-ray image is helpful for many medical studies such as diagnosis, surgery and treatment. In this paper, we propose a new approach based on pure dilated residual U-Net for the segmentation of the femur and tibia bones. The proposed approach employs dilated convolution completely to increase the receptive field, in this way, we can make full use of the advantages of dilated convolution. We conducted experiments and evaluations on datasets provided by Tianjin hospital. Comparison with the classical U-net and FusionNet, our method has fewer parameters, higher accuracy, and converges more rapidly, which means the high performance of the proposed method.

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Mathematics Subject Classification: Primary: 68T07; Secondary: 68T20.

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Figure 1. The Architecture of PDR U-Net. f represents the number of filters.d represents the dilated rate.The keep rate of dropout is 0.7

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Figure 2. The details of the standard block and residual block. f represents the number of filters. d represents the dilated rate

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Figure 3. the illustration on the left is an unfilled femur label and on the right is a filled tibia label

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Figure 4. The whole process of data augmentation

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Figure 5. The caption on the left is the loss of PDRU-Net on the training set, and that on the right is the loss of PDRU-Net on the validation set

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Figure 6. Segmentation results of the first three training epochs

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Figure 7. The first three columns show the segmentation results of U-Net, FusionNet and PDR U-Net respectively.The third and fourth columns show the corresponding ground truth images and input images respectively

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Table 1. The receptive field of each block in the encoding path of PDRU-Net

Block Type	Convolutional Layer	Receptive Field
standard block 1	conv1_1	1-1+1$ \times $2+1=3
dilated rate = 1	conv1_2	3-1+1$ \times $2+1=5
residual block 2	conv2_1	5-1+2$ \times $2+1=9
dilated rate = 2	conv2_2	9-1+2$ \times $2+1=13
residual block 3	conv3_1	13-1+4$ \times $2+1=21
dilated rate = 4	conv3_2	21-1+4$ \times $2+1=29
residual block 4	conv4_1	29-1+8$ \times $2+1=45
dilated rate = 8	conv4_2	45-1+8$ \times $2+1=61
residual block 5	conv5_1	61-1+16$ \times $2+1=93
dilated rate = 16	conv5_2	93-1+16$ \times $2+1=125
residual block 6	conv6_1	125-1+32$ \times $2+1=189
dilated rate = 32	conv6_2	189-1+32$ \times $2+1=253
residual block 7	conv7_1	253-1+32$ \times $2+1=317
dilated rate = 32	conv7_2	317-1+32$ \times $2+1=381
residual block 8	conv8_1	381-1+32$ \times $2+1=445
dilated rate = 32	conv8_2	445-1+32$ \times $2+1=509

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Table 2. Comparison of the PDRU-Net, U-Net and FusionNet

model	parameters	Dice Coefficient	Pixel Accuracy	Recall	Precision	F1 score
U-Net	~33M	0.918	0.943	0.839	0.987	0.907
FusionNet	~78M	0.944	0.969	0.877	0.997	0.933
PDRU-Net	~0.36M	0.973	0.987	0.953	0.976	0.964

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