2019
Chen, Jianan; Milot, Laurent; Cheung, Helen M C; Martel, Anne L.
Unsupervised Clustering of Quantitative Imaging Phenotypes Using Autoencoder and Gaussian Mixture Model Book Section
In: MICCAI . International Conference on Medical Image Computing and Computer-Assisted Intervention, pp. 575–582, Shenzhen, China, 2019.
Abstract | Links | BibTeX | Tags: MRI, probabilistic generative modeling, radiomics, unsupervised clustering
@incollection{Chen2019b,
title = {Unsupervised Clustering of Quantitative Imaging Phenotypes Using Autoencoder and Gaussian Mixture Model},
author = {Jianan Chen and Laurent Milot and Helen M C Cheung and Anne L. Martel},
url = {http://link.springer.com/10.1007/978-3-030-32251-9_63},
doi = {10.1007/978-3-030-32251-9_63},
year = {2019},
date = {2019-01-01},
urldate = {2019-01-01},
booktitle = {MICCAI . International Conference on Medical Image Computing and Computer-Assisted Intervention},
pages = {575–582},
address = {Shenzhen, China},
abstract = {Quantitative medical image computing (radiomics) has been widely applied to build prediction models from medical images. However, overfitting is a significant issue in conventional radiomics, where a large number of radiomic features are directly used to train and test models that predict genotypes or clinical outcomes. In order to tackle this problem, we propose an unsupervised learning pipeline composed of an autoencoder for representation learning of radiomic features and a Gaussian mixture model based on minimum message length criterion for clustering. By incorporating probabilistic modeling, disease heterogeneity has been taken into account. The performance of the proposed pipeline was evaluated on an institutional MRI cohort of 108 patients with colorectal cancer liver metastases. Our approach is capable of automatically selecting the optimal number of clusters and assigns patients into clusters (imaging subtypes) with significantly different survival rates. Our method outperforms other unsupervised clustering methods that have been used for radiomics analysis and has comparable performance to a state-of-the-art imaging biomarker.},
keywords = {MRI, probabilistic generative modeling, radiomics, unsupervised clustering},
pubstate = {published},
tppubtype = {incollection}
}
Quantitative medical image computing (radiomics) has been widely applied to build prediction models from medical images. However, overfitting is a significant issue in conventional radiomics, where a large number of radiomic features are directly used to train and test models that predict genotypes or clinical outcomes. In order to tackle this problem, we propose an unsupervised learning pipeline composed of an autoencoder for representation learning of radiomic features and a Gaussian mixture model based on minimum message length criterion for clustering. By incorporating probabilistic modeling, disease heterogeneity has been taken into account. The performance of the proposed pipeline was evaluated on an institutional MRI cohort of 108 patients with colorectal cancer liver metastases. Our approach is capable of automatically selecting the optimal number of clusters and assigns patients into clusters (imaging subtypes) with significantly different survival rates. Our method outperforms other unsupervised clustering methods that have been used for radiomics analysis and has comparable performance to a state-of-the-art imaging biomarker.