A female patient with clinical symptoms of systemic sclerosis present with shoness of breath and B/L basal rales, her CXR showed reticular opacities in B/L basal fields. What is the Next Best Step?

H/O systemic sclerosis with shoness of breath and CXR findings are suggestive ofInterstitial lung disease(ILD). Investigation Of Choice for ILD is HRCT ILD is the most common pulmonary manifestatation of systemic sclerosis It occurs in about half of patients with diffuse disease and in about 1/3rd cases with limited disease.