Diagnostic value of spiral CT and post-processing for pulmonary fissures

Abstract

Objective To investigate the diagnostic value of spiral CT and post processing for pulmonary fissure. Methods 64-slice spiral CT scanning and image reconstruction were performed for 54 patients with no abnormalities in chest CT and 26 cases confirmed with lesions near pulmonary fissures. The oblique fissure, horizontal fissure, and interlobar variation shown under different slice thickness were analyzed and compared. Results As for the oblique fissure shown under 1.25 mm slice thickness, 89.81% images showed linear shadow, higher than the 75.00% of 2.50 mm slice thickness, with a statistical difference (χ2=8.51, P<0.05); as for that shown under 2.50 mm slice thickness, 75.00% images showed linear shadow, higher than the 42.60% of 3.75 mm slice thickness, with a statistical difference (χ2=27.45, P<0.05); as for the horizontal fissure shown under 1.25 mm slice thickness, 11.11% images showed linear shadow, 17.75% images showed vessel-poor shadow, and 73.14% images showed band-like shadow; the reconstruction of images obtained under 1.25 mm slice thickness was performed by three-dimensional reconstruction at sagittal, coronal and cross section, with the following results: oblique fissure of right lung (χ2=238.65, P<0.05), horizontal fissure of right lung (χ2=328.79, P<0.05), horizontal fissure of left lung (χ2=377.44, P<0.05), with statistical differences. Conclusions Post-processing of multi-slice spiral CT scanning has advantages in showing pulmonary fissures, especially the reconstructed 1.25 mm image, contributing to multi-dimensional analysis. Therefore, it has high reference value in the diagnosis of pulmonary diseases. Key words: Spiral CT; Thin slice reconstruction; Pulmonary fissure; Post-processing