Dr. Bing Ji Profile

Dr. Bing Ji

at Emory Univ

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Publications (2)

Proceedings Article | 15 February 2021 Presentation + Paper

Deep learning-based denoising for magnetic resonance spectroscopy signals

Yang Lei, Bing Ji, Tian Liu, Walter Curran, Hui Mao, Xiaofeng Yang

Proceedings Volume 11600, 1160006 (2021) https://doi.org/10.1117/12.2580988

KEYWORDS: Magnetic resonance imaging, Signal to noise ratio, Denoising, In vivo imaging, Data acquisition

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Magnetic resonance spectroscopy (MRS) is a non-invasive imaging tool for detecting and quantifying metabolites in vivo. However, the spectral data often suffer from poor signal-to-noise ratio (SNR) due to low concentrations of metabolites and limited acquisition time. In this work, we introduce a deep learning-based method for denoising MRS spectra. By identifying and characterizing the sparse representations in the feature vector domain of the noise in MRS data using the deep learning network, the non-signal components can be removed to improve the SNR of spectral data. We used a stack auto-encoder (SAE) network to train the deep learning-based model based on high SNR data collected from a brain phantom using a high number of signal average (NSA=192). To overcome overfitting, the SAE network is trained in a patch-based manner. The network and denoising method were then tested using the noisy data collected in the same sample volume but using low NSA (NSA=8) with much shorter acquisition time. The denoising performance of the reported method was then evaluated using statistical comparison analysis of spectra before and after being denoised and the paired “ground truth” high NSA spectra based on the measurements of SNR, and mean squared error (MSE) and known metabolite levels. for the results of testing and evaluating the reported method showed that the SNR improved by 40% and the MSE reduced by 72% in the data collected from the brain phantom, while, the SNR improved by 47% and the MSE reduced by 27% in the data collected from the human subjects. In summary, the reported deep-learning method demonstrated a model-free approach to enhance SNR of noisy MRS data that otherwise cannot be used for quantitative analysis. The potential applications of include using low NSA or short data collection time to accelerate MRS exams while maintaining adequate spectroscopic information for detection and quantification of the metabolites of interest when a little time is available for an MRS exam in the clinical setting.

Proceedings Article | 15 March 2019 Paper

Machine-learning based classification of glioblastoma using dynamic susceptibility enhanced MR image

Jiwoong Jason Jeong, Bing Ji, Yang Lei, Liya Wang, Tian Liu, Arif Ali, Walter Curran, Hui Mao, Xiaofeng Yang

Proceedings Volume 10953, 1095329 (2019) https://doi.org/10.1117/12.2512557

KEYWORDS: Magnetic resonance imaging, Tumors, Tissues, Image classification, Feature selection, Image enhancement, Feature extraction, Machine learning, Brain, Cancer

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