Background and purpose: 18F-flurodeoxyglucose (18F-FDG) positron emission tomography and computed tomography (PET/CT) is a common method for the diagnosis of malignant tumors with distant metastases. However the detection of lung metastases. especially small lesions. is still unsatisfactory. https://www.allfixelectricales.shop/product-category/rcd-mains-extension-lead/