BT	bandelet transform
CNN	convolutional neural networks
US	ultrasound
DA	data augmentation
TC	thyroid cancer
TN	thyroid nodules
TL	transfer learning
WT	wavelet transform
DWT	discrete wavelet transform
BT	bandlet transform
DDTI	digital database of thyroid ultrasound images
BLR	binary logistic regression
FPN	feature pyramid network
SL-FCN	soft-label fully convolutional network
OCT	optical coherence tomography
SMOTE	synthetic minority oversampling technique
LSTM	long short-term memory
DL	deep learning