2D	Two dimensions
3D	Three dimensions
ASM	Active shape model
CNN	Convolutional neural networks
CW	Complex wavelet
SSIM	Structural similarity index measure
CT	Computed tomography
DCAE	Denoising convolutional autoencoder
EV	Evaluation
EPG	Electropalatography
EMA	Electromagnetic articulatory
ECG	Electrocardiography
EEG	Electroencephalography
EMG	Electromyography
LSTM	Long short-term memory
MSD	Mean sum of distances
MSE	Mean squared error
MRI	Magnetic resonance imaging
ML	Machine learning
PMA	Permanent magnet articulator
PCA	Principal component analysis
RMSE	Root-mean-square error
SSI	Silent-speech interface
US	Ultrasound