Quantification analysis of pleural line movement for the diagnosis of pneumothorax

Figure 1 Peak velocity measurement. Tissue Doppler image (left), ultrasound image (right); region of interest 1 (ROI1, red dot) at the midpoint of the pleural line, ROI2 (yellow dot), 0.5 cm from the pleural line; velocity-time curve of ROI1 (red curve), velocity-time curve of ROI2 (yellow curve); velocity of ROI1 (white arrow, dotted line), peak velocity of ROI2 (white arrow, solid line).

Figure 2 Peak strain measurement. Tissue Doppler image (left), ultrasound image (right); region of interest 1 (ROI1, red dot) at the midpoint of the pleural line, ROI2 (yellow dot), 0.5 cm from the pleural line; strain-time curve of ROI1 (red curve), strain-time curve of ROI2 (yellow curve); peak strain of ROI1 (white arrow, dotted line), peak strain of ROI2 (white arrow, solid line).

Figure 3 A flowchart of patient selection for our study. CT: Computed tomography.

Figure 4 Tissue Doppler imaging of the pneumothorax side and the non-pneumothorax side. A: Velocity-time curve (pneumothorax side); B: Strain-time curve (pneumothorax side); C: Velocity-time curve (non-pneumothorax side); D: Strain-time curve (non-pneumothorax side).

Figure 5 Scatter plot of measurements obtained by tissue Doppler imaging. A: Scatter plot of peak pleural line velocity; B: Scatter plot of peak pleural line strain value; C: Scatter plot of peak pleural line velocity/peak chest wall tissue velocity; D: Scatter plot of peak pleural line strain value/peak chest wall tissue strain value. Data are expressed as the median and interquartile range. PV_max: Peak pleural line velocity; CV_max: Peak chest wall tissue velocity; PS_max: Peak pleural line strain value; CS_max: Peak chest wall tissue strain value.

Figure 6 Receiver operating characteristic analysis of the extracted measurements obtained by tissue Doppler imaging. PV_max: Peak pleural line velocity; CV_max: Peak chest wall tissue velocity; PS_max: Peak pleural line strain value; CS_max: Peak chest wall tissue strain value.