Abstract
Purpose: MRSI has shown great promise in the detection and monitoring of neurologic pathologies such as tumor. A necessary component of data processing includes the quantitation of each metabolite, typically done through fitting a model of the spectrum to the data. For high-resolution volumetric MRSI of the brain, which may have ~10,000 spectra, significant processing time is required for spectral analysis and generation of metabolite maps. Methods: A novel unsupervised deep learning architecture that combines a convolutional neural network with a priori models of the spectrum is presented. This architecture, a convolutional encoder–model decoder (CEMD), combines the strengths of adaptive and unbiased convolutional networks with models of magnetic resonance and is readily interpretable. Results: The CEMD architecture performs accurate spectral fitting for volumetric MRSI in patients with glioblastoma, provides whole-brain fitting in 1 min on a standard computer, and handles a variety of spectral artifacts. Conclusion: A new architecture combining physics domain knowledge with convolutional neural networks has been developed and is able to perform rapid spectral fitting of whole-brain data. Rapid processing is a critical step toward routine clinical practice.
Original language | English (US) |
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Pages (from-to) | 3346-3357 |
Number of pages | 12 |
Journal | Magnetic Resonance in Medicine |
Volume | 81 |
Issue number | 5 |
DOIs | |
State | Published - May 2019 |
Keywords
- MR spectroscopy
- MRSI
- brain
- deep learning
- machine learning
- spectral analysis
- spectroscopic imaging
ASJC Scopus subject areas
- Radiology Nuclear Medicine and imaging