lung imaging

Lung imaging includes pulmonary perfusion imaging (Pulmonary Perfusionlmaging), pulmonary ventilation imaging (Pulmonary Ventilationlmaging), and lung tumor imaging. Pulmonary perfusion imaging showed blood perfusion of lung tissue, and the commonly used imaging agent was Tc-labeled macroglobulin (Tc-MAA). After intravenous injection of Tc-MAA37MBq (containing 0.5 mg of MAA, about 200,000-500,000 diameters of 10-60 μm particles), it can be temporarily temporarily embolized in the pulmonary capillary bed, the number of local embolization particles and the amount of blood perfusion there. In proportion, because the capillaries account for only a few hundred thousandth of the total number of capillaries, it does not cause changes in cardiopulmonary hemodynamics and lung function. It is usually imaged immediately after injection. The normal lung image is clear and the radioactivity distribution is basically uniform. The blood flow at the tip of the lung is low due to gravity, and the radioactivity is relatively sparse. Lung ventilation imaging reflects the filling of the alveoli in the respiratory tract and throughout the lung. The subject inhales a radioactive gas such as Xe or a Tc aerosol in a closed system, and performs imaging after filling the airway and the alveoli. Normal people show a uniform distribution of radioactivity in the airway and lungs. When the airway is narrowed or blocked, or there is exudate or collapse in the alveoli, the ventilation or ventilation space is reduced, and radioactivity is reduced or abnormal. Lung tumor imaging uses an imaging agent such as Tc-glucose hydrochloride or Ca which is less concentrated in normal lung tissue but can be concentrated in lung cancer cells. After intravenous injection, lung cancer lesions can be clearly imaged, and benign tumors are also slightly concentrated, but the amount of aggregation is lower than that of malignant tumors. Basic Information Specialist Category: Respiratory Examination Category: Radionuclide Applicable gender: whether men and women apply fasting: not fasting Analysis results: Below normal: Normal value: no Above normal: negative: 1. Pulmonary perfusion imaging shows the perfusion of lung tissue. The normal lung image is clear, the radioactivity distribution is basically uniform, the blood flow at the tip of the lung is low due to gravity, and the radioactivity is relatively sparse. 2. Lung ventilation imaging reflects the filling of the alveoli in the respiratory tract and all parts of the lung. The normal person is characterized by uniform distribution of radioactivity in the airway and lung. 3, lung tumor imaging, lung injection lesions can be clearly imaged after intravenous injection, benign tumors also have mild concentration, but the amount of aggregation is lower than malignant tumors. Positive: 1. Diagnosis and curative effect observation of pulmonary embolism. In the early stage of pulmonary embolism, pulmonary perfusion imaging and ventilation imaging results may not match, that is, local perfusion defects occur and ventilation is normal. Simple lung perfusion imaging also has a certain significance for the diagnosis of pulmonary embolism. It is generally considered that the sensitivity is 70-80% and the specificity is about 80%. If there are multiple typical lung segment radioactive defect areas, the possibility of pulmonary embolism is almost 100%. 2. Lung ventilation imaging of chronic obstructive pulmonary disease manifests as diffuse radioactivity reduction and/or defect. If the radioactivity of the lung perfusion image is reduced at the same time, it indicates that the lesion has damaged the pulmonary capillary bed and the anterior capillary artery. 3. Lung cancer assisted diagnosis, surgical selection and estimation of residual lung function. Pro-tumor imaging has unique diagnostic value for peripheral lung cancer, which is difficult to diagnose with X-ray films and difficult to achieve by bronchoscopy. Direct compression or infiltration of adjacent lung vessels by lung cancer lesions can result in reduced blood flow in the perfusion zone. Pulmonary perfusion imaging before surgery can be used to determine the extent of tumor infiltration and the extent of pulmonary vascular involvement based on the size of the radioactive reduction zone. Tips: Pay attention to rest before inspection to prevent fatigue. Normal value 1. Pulmonary perfusion imaging shows the perfusion of lung tissue. The normal lung image is clear, the radioactivity distribution is basically uniform, the blood flow at the tip of the lung is low due to gravity, and the radioactivity is relatively sparse. 2. Lung ventilation imaging reflects the filling of the alveoli in the respiratory tract and all parts of the lung. The normal person is characterized by uniform distribution of radioactivity in the airway and lung. 3, lung tumor imaging, lung injection lesions can be clearly imaged after intravenous injection, benign tumors also have mild concentration, but the amount of aggregation is lower than malignant tumors. Clinical significance Abnormal results: 1. Diagnosis and curative effect observation of pulmonary embolism. In the early stage of pulmonary embolism, pulmonary perfusion imaging and ventilation imaging results may not match, that is, local perfusion defects occur and ventilation is normal. Simple lung perfusion imaging also has a certain significance for the diagnosis of pulmonary embolism. It is generally considered that the sensitivity is 70-80% and the specificity is about 80%. If there are multiple typical lung segment radioactive defect areas, the possibility of pulmonary embolism is almost 100%. 2. Lung ventilation imaging of chronic obstructive pulmonary disease manifests as diffuse radioactivity reduction and/or defect. If the radioactivity of the lung perfusion image is reduced at the same time, it indicates that the lesion has damaged the pulmonary capillary bed and the anterior capillary artery. 3. Lung cancer assisted diagnosis, surgical selection and estimation of residual lung function. Pro-tumor imaging has unique diagnostic value for peripheral lung cancer, which is difficult to diagnose with X-ray films and difficult to achieve by bronchoscopy. Direct compression or infiltration of adjacent lung vessels by lung cancer lesions can result in reduced blood flow in the perfusion zone. Pulmonary perfusion imaging before surgery can be used to determine the extent of tumor infiltration and the extent of pulmonary vascular involvement based on the size of the radioactive reduction zone. People who need to be examined: Patients with pulmonary embolism, lung disease and lung tumors can be examined. Positive results may be diseases: elderly patients with lung cancer, idiopathic pulmonary fibrosis, pulmonary arteriovenous tumors Taboo before inspection: Generally no special preparation is required. Requirements for examination: Intravenous injection of tracer for 40 minutes after examination. Inspection process Pulmonary perfusion imaging showed blood perfusion of lung tissue, and the commonly used imaging agent was Tc-labeled macroglobulin (Tc-MAA). After intravenous injection of Tc-MAA37MBq (containing 0.5 mg of MAA, about 200,000-500,000 diameters of 10-60 μm particles), it can be temporarily temporarily embolized in the pulmonary capillary bed, the number of local embolization particles and the amount of blood perfusion there. In proportion, because the capillaries account for only a few hundred thousandth of the total number of capillaries, it does not cause changes in cardiopulmonary hemodynamics and lung function. It is usually imaged immediately after injection. The normal lung image is clear and the radioactivity distribution is basically uniform. The blood flow at the tip of the lung is low due to gravity, and the radioactivity is relatively sparse. Lung ventilation imaging reflects the filling of the alveoli in the respiratory tract and throughout the lung. The subject inhales a radioactive gas such as Xe or a Tc aerosol in a closed system, and performs imaging after filling the airway and the alveoli. Normal people show a uniform distribution of radioactivity in the airway and lungs. When the airway is narrowed or blocked, or there is exudate or collapse in the alveoli, the ventilation or ventilation space is reduced, and radioactivity is reduced or abnormal. Lung tumor imaging uses an imaging agent such as Tc-glucose hydrochloride or Ca which is less concentrated in normal lung tissue but can be concentrated in lung cancer cells. After intravenous injection, lung cancer lesions can be clearly imaged, and benign tumors are also slightly concentrated, but the amount of aggregation is lower than that of malignant tumors. Not suitable for the crowd Inappropriate people: no special requirements. Adverse reactions and risks Nothing.