Readily accessible CT scoring method to quantify fibrosis in IPF.

Area of Science:

• Pulmonary Medicine
• Radiology
• Medical Imaging

Background:

• Idiopathic pulmonary fibrosis (IPF) lacks a specific, accessible measure for quantifying lung fibrosis.
• Accurate fibrosis quantification could differentiate fibrosis contribution to lung function decline and assess antifibrotic treatment response.

Purpose of the Study:

• To develop and validate CT-based scoring methods for quantifying lung fibrosis in IPF.
• To assess the correlation of these scores with lung function, disease severity (CPI), and patient survival.

Main Methods:

• A pilot study involving 39 IPF patients utilized a CT-based visual scoring method.
• The Total Fibrosis Score (TFS) and individual fibrotic feature scores were calculated.
• Correlations were examined with lung function (TLCO, FVC), Composite Physiologic Index (CPI), and 5-year mortality.

Main Results:

• TFS measurements demonstrated high reproducibility (r=0.982) and significant correlation with TLCO, FVC, and CPI.
• Traction bronchiectasis score showed superior correlation with lung function and CPI, comparable to TFS.
• Both TFS and traction bronchiectasis score strongly correlated with 5-year mortality (r=0.60).

Conclusions:

• CT-based TFS and a 6-slice traction bronchiectasis quantification method are proposed as simple, accessible tools for IPF fibrosis assessment.
• These scores can aid in attributing clinical deterioration to fibrosis, correlating research findings, and stratifying patients for treatment.
• Further studies are warranted to validate these scores and their ability to measure changes in fibrosis over time.