Table 2.

Choice of Chest CT protocol according to clinico-radiographic scenario

Clinicoradiographic indications	CT Protocol
Screening for pulmonary metastasis	NCCT
As part of Lung Cancer Screening Program	LDCT
Unexplained dyspnoea on exertion, suspected or known case of ILD (e.g. In connective tissue diseases, rheumatological disorders), follow -up of ILD	NCCT
Suspected or known bronchiectasis, small airway disease	NCCT/LDCT
PUO	CECT (chest and abdomen)
Non-resolving pneumonia	CECT
Mediastinal widening	CECT
Malignant pleural effusion, empyema, chest wall disease	CECT
Staging and follow-up of lung cancer	CECT, Biphasic protocols*
Staging and follow -up of lymphoma	CECT (neck, chest and abdomen)
Unexplained vocal cord palsy	CECT
Evaluation of solitary pulmonary nodules	CECT, Dynamic multiphase CT
Blunt or penetrating chest trauma	CECT, CTA
Recurrent/Significant haemoptysis	CTA, Split-bolus CTA
Atypical chest pain (additional diagnosis other than acute coronary syndrome is considered e.g., Pulmonary embolism or aortic dissection)	CTA
Intermediate to high clinical probability of pulmonary thromboembolism or positive D-dimer level including pregnant patients (ACR Appropriateness Criteria, revised 2016)	CTPA

NCCT- refers to routine non contrast CT as detailed in the text; ILD- interstitial lung disease ;CECT - Contrast enhanced CT; CTPA- CT pulmonary angiography; CTA - CT angiography; *. Is used when these are to be used in special situations detailed in text