3D-CT lung volumetry using multidetector row computed tomography: pulmonary function of each anatomic lobe

Area of Science:

• Pulmonary Medicine
• Radiology
• Thoracic Surgery

Background:

• Accurate assessment of lung lobe volumes is crucial for predicting surgical outcomes.
• 3D-CT imaging offers detailed anatomical visualization.
• Pulmonary function tests (PFTs) evaluate lung capacity and gas exchange efficiency.

Purpose of the Study:

• To quantify individual lung lobe volumes using 3D-CT.
• To correlate these volumes with PFT results.
• To identify which lung lobes most significantly impact pulmonary function.

Main Methods:

• Review of preoperative 3D-CT scans and spirometry data from 111 patients undergoing lung resection evaluation.
• Semiautomatic segmentation of 3D-CT images to calculate total, emphysematous, and normal lobar volumes (NLV).
• Statistical analysis (Pearson correlation, multiple regression) to assess relationships between NLV and PFTs (vital capacity, FEV1, DLCO).

Main Results:

• Normal lobar volumes of both right and left lower lobes showed significant correlations with vital capacity and FEV1.
• Lower lobe NLV demonstrated a strong correlation with diffusing capacity for carbon monoxide (DLCO).
• Upper and middle lobe NLV did not significantly correlate with DLCO.

Conclusions:

• Pulmonary function, particularly DLCO, is predominantly affected by the normal lobar volumes of the lower lung lobes.
• These findings highlight the importance of lower lobe volume in overall lung function.
• 3D-CT derived lobar volumes provide valuable insights for surgical decision-making in lung disease.