Quantification analysis of pleural line movement for the diagnosis of pneumothorax

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).