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Keywords:
Lung, Respiratory system, Computer applications, Digital radiography, Fluoroscopy, Computer Applications-Detection, diagnosis, Diagnostic procedure, Chronic obstructive airways disease, Obstruction / Occlusion, Image registration
Authors:
R. Tanaka1, S. Sanada1, K. Sakuta1, H. Kawashima1, Y. Kishitani2; 1Kanazawa/JP, 2Chuoh-ku/JP
DOI:
10.1594/ecr2015/C-0239
Results
In normal controls,
color map images showed a left-right symmetric distribution increasing from the lung apex to the bottom region of the lung,
showing statistically-significant difference (P<0.05).
In addition,
there was a high correlation in respiratory changes in pixel values among both lungs (r=0.97) (Fig.
4).
In contrast,
many abnormal cases showed a nonuniform distribution on color map images that differed from the normal pattern.
The areas with decreased changes in pixel values were confirmed to correspond to ventilation defect areas found on the pulmonary scintigrams.
Figure 5 shows the results of a patient with pleural adhesions in the left lung (72 year-old woman,
Case d in Fig.
4).
Lung scintigraphy showed marked reduction in ventilation in the left lung in comparison with the right lung.
Color map images also showed reduced changes in pixel value over the left lung.
Figure 6 shows the results in a patient with pleuropulmonary disease (74 year-old man,
Case b in Fig.
4).
This patient had reduced ventilation area in the right whole lung.
The abnormal area appeared reduced changes in pixel values on the color map images.
In the patients with bilateral impairments,
there was a high correlation in respiratory changes in pixel values among both lungs (r=0.97) (Fig.
4).
However,
in the patients with unilateral impairments,
there was significant difference in respiratory changes in pixel value between left and right lungs.
The respiratory changes in average pixel values measured in each lung showed deviations from the normal controls and patients with bilateral impairments in either of inspiratory or expiratory phases as shown in Fig.
4.