Automated Analysis of Low-Field Brain MRI in Cerebral Malaria
Manu S. Goyal,
Jordan D Dworkin,
Theodore D Satterthwaite,
Paul A Yushkevich,
Nicholas J. Tustison,
Douglas G. Postels,
Terrie E Taylor,
Dylan S Small,
Russell T Shinohara
Posted 25 Dec 2020
bioRxiv DOI: 10.1101/2020.12.23.424020
Posted 25 Dec 2020
A central challenge of medical imaging studies is to extract biomarkers that characterize disease pathology or outcomes. Modern automated approaches have found tremendous success in high-resolution, high-quality magnetic resonance images (MRI). These methods, however, may not translate to low resolution images acquired on MRI scanners with lower magnetic field strength. In low-resource settings where low-field scanners are more common and there is a shortage of radiologists to manually interpret MRI scans, it is critical to develop automated methods that can augment or replace manual interpretation, while accommodating reduced image quality. We present a fully automated framework for translating radiological diagnostic criteria into image-based biomarkers, inspired by a project in which children with cerebral malaria were imaged using low-field 0.35 Tesla MRI. We integrate multi-atlas label fusion, which leverages high-resolution images from another sample as prior spatial information, with parametric Gaussian hidden Markov models based on image intensities, to create a robust method for determining ventricular cerebrospinal fluid volume. We also propose normalized image intensity and texture measurements to determine the loss of gray-to-white matter tissue differentiation and sulcal effacement. These integrated biomarkers have excellent classification performance for determining severe brain swelling due to cerebral malaria.
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