Table 4. LDA topic modeling effect evaluation.

Rank	Topic label	Topic size	Doc prominence
1	COVID-19	109.23	99
2	Liver	146.24	99
3	Nodule	149.78	90
4	Vessel	156.18	84
5	Bone	159.13	89
6	Breast	164.84	69
7	Brain	166.46	69
8	Alzheimer’s disease	178.54	70
9	Denoising	180.06	47
10	Prostate	180.44	63
11	PET	180.65	84
12	Radiomics	182.65	50
13	Diabetes	184.71	56
14	Stroke	185.85	58
15	Lymphatic	187.17	71
16	Cardiac	189.77	84
17	Knee	190.83	72
18	Registration	192.74	55
19	Dental	198.51	59
20	Uncertainty	201.06	52
21	Compression	206.14	44
22	Pancreas	206.76	55
23	Muscle	209.14	67
24	Multi-modal	210.29	56
25	Retrieval	211.67	67
26	Cortical	212.5	45
27	Tuberculosis	215.21	57
28	Cervical	225.69	48
29	Hemorrhage	228.35	51
30	Hypertension	230.42	28

LDA, latent Dirichlet allocation; COVID-19, coronavirus disease 2019; PET, positron emission tomography.