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Fig. 3B. —65-year-old man with lung cancer without pulmonary emphysema. Relative enhancement map obtained after oxygen inhalation shows little enhancement of atelectatic lung and tumor. Area of decreased oxygen-enhancement in lateral peripheral portion of anterior segment of right upper lobe was also observed. This may be due to restricted physical motion. Maximum mean relative enhancement ratio by oxygen inhalation was 26.1%SI (percentage increase of signal intensity).

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