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Positron emission tomography (PET) using 18F-fluorodeoxyglucose (FDG) has not been widely used in China for expensive cost ($1200). Dual-head coincidence single photon emission computed tomography (DHC-SPECT) can depict many of the lesions depicted with a PET scanner in the lungs, which is used in place of PET-CT for discriminating malignant from benign pulmonary nodules in many studies. However, DHC-SPECT has inevitable false-negative results because the sensitivity for small lesions less than 2.0 cm is limited, and has high false-positive rate for active inflammatory nodules. Furthermore,DHC-SPECT also has a considerably higher cost ($300 in China) than other imaging examination.