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CONTENTS

1 Introduction of COVID-19 / 107

1.1 Discovery and Development History of COVID-19 108

1.2 Epidemiology of COVID-19 111

1.3 Etiological Detection Value of COVID-19 116

1.4 CT Detection Value of COVID-19 117

2 Clinical Manifestations and Treatment of COVID-19/ 119

2.1 Clinical Classification of COVID-19 120

2.2 Clinical Manifestations of COVID-19 121

2.3 Characteristics of Laboratory Tests of COVID-19 122

2.4 Diagnostic Criteria of COVID-19 123

2.5 Treatment of COVID-19 123

2.6 Discharge Criteria and Follow-up for COVID-19 128

3 Procedures and Diagnostic Specification for COVID-19 / 129

3.1 Procedures for Testing COVID-19 130

3.2 Procedures for Patients with Fever (with Epidemiological

History), Suspected and Confirmed COVID-19 135

3.3 Procedures for Common Fever Patients and Common

Patients (Suspected COVID-19 Patients Found on Tests) 137

3.4 Examination Procedures of Common Patients

with Fever and Common Patients 139

3.5 Procedures for Clinical Schemes of Patients with Fever

(with an Epidemiological History), Suspected and

Confirmed COVID-19 141

3.6 Screening Techniques of COVID-19 143

3.7 Diagnostic Guidelines of COVID-19 147

4 Image Stage and Pathological Basis of COVID-19 / 151

4.1 Imaging Staging of COVID-19 152

4.2 Pathological Basis of COVID-19 154

4.3 Clinical and Pathological Changes of COVID-19 158

5 CT Features of the Early Stage of COVID-19 / 161

5.1 Typical CT Manifestations of Mild Cases

of COVID-19 in an Early Stage 162

5.2 CT Manifestations of Severe Cases

of COVID-19 in an Early Stage 166

5.3 CT Manifestations of Atypical Cases

of COVID-19 in an Early Stage 168

6 CT Manifestations of COVID-19 in an Advanced Stage / 171

6.1 Typical CT Manifestations of Mild Cases

of COVID-19 in an Advanced Stage 172

6.2 Typical CT Manifestations of Severe Cases

of COVID-19 in an Advanced Stage 174

6.3 Atypical CT manifestations of COVID-19 in an Advanced Stage 182

7 CT Features of COVID-19 in Peak Period / 185

7.1 Typical CT Manifestations of Mild Cases

of COVID-19 in Peak Period 186

7.2 Typical CT Manifestations of Severe Cases

of COVID-19 in Peak Period 189

7.3 CT Features of Atypical COVID-19 in the Peak Period 195

8 CT Features of COVID-19 in Resolution Period / 199

²Î¿¼ÎÄÏ×/ 203