基于Fisher向量和混合描述符的胎盘成熟度分级

doi:10.3969/j.issn.0258-8021.2018.05.002

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Abstract Placental maturity grading (PMG) is very essential to assess fetal growth and maternal health. However, PMG has mostly relied on the clinician’s subjective judgment, which is time-consuming and subjective. A dditionally it may cause wrong estimation because of redundancy and repeatability of the process. Traditional machine learning-based methods capitalize on handcrafted features, but such features may be essentially insufficient for PMG. In order to tackle it, we proposed an automatic method to stage placental maturity via deep hybrid descriptors extracted from B-mode ultrasound (BUS) and color Doppler energy (CDE) images. Specifically, convolutional descriptors extracted from a deep convolutional neural network (CNN) and hand-crafted features were combined to form hybrid descriptors to boost the performance of the proposed method. Firstly, different models with various feature layers were combined to obtain hybrid descriptors from images. Meanwhile, the transfer learning strategy was utilized to enhance the grading performance based on the deep representation features. Then, extracted descriptors were encoded by Fisher vector (FV). Finally, we used support vector machine (SVM) as the classifier to grade placental maturity. We used placental data labeled by doctors to test models. The accuracy of the model with hybrid descriptors based on the 19-layer network was 94.15%, which was 3.01% higher than that of the model with hand-crafted features and 7.35% higher than the CNN feature model. The experimental results demonstrated that the proposed method could be applied to the automatic PMG effectively.

Key words： placental maturity grading ultrasound image deep convolutional network hybrid descriptors Fisher vector

Received: 16 October 2017

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R318

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	Articles by authors
	Jiang Feng
	Ni Dong
	Chen Siping
	Yao Yuan
	Wang Tianfu
	Lei Baiying

Cite this article:

Jiang Feng,Ni Dong,Chen Siping, et al. Placental Maturity Grading via Hybrid Descriptors and Fisher Vector[J]. Chinese Journal of Biomedical Engineering, 2018, 37(5): 521-528.

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http://cjbme.csbme.org/EN/10.3969/j.issn.0258-8021.2018.05.002 OR http://cjbme.csbme.org/EN/Y2018/V37/I5/521

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