Lateral pulmonary perfusion imaging

Lateral lung perfusion imaging quantitative analysis is a method for evaluating pulmonary artery pressure. The position change of patients with pulmonary hypertension has little effect on the changes of blood flow in the lung field. Therefore, the degree of pulmonary hypertension can be determined by quantitative analysis of lateral perfusion lung imaging. Basic Information Specialist Category: Respiratory Examination Category: Radionuclide Applicable gender: whether men and women apply fasting: not fasting Analysis results: Below normal: Less than 4 mm Hg usually indicates poor filling of the heart chamber or insufficient blood volume. Normal value: Lateral lung perfusion imaging: 6-10mmHg Above normal: Above 12 mm Hg usually indicates right heart dysfunction. negative: Positive: Tips: Pay attention to normal eating habits before check, pay attention to personal hygiene. Normal value The normal value is 6~10mmHg. Less than 4 mmHg usually indicates poor filling of the heart chamber or insufficient blood volume, and above 12 mmHg usually indicates right heart dysfunction. Clinical significance Pulmonary hypertension is one of the major complications of cardiopulmonary disease. Abnormal results: myocardial perfusion imaging cardiomyocytes have selective uptake of certain radionuclides or labeled compounds, and the amount of uptake is directly proportional to myocardial perfusion. Coronary stenosis to a certain extent (more than 50%), local myocardial blood flow decreased, so the tracer intake in this area decreased, showing a sparse or defective area of ​​radioactivity. People who need to be examined: patients with cardiopulmonary diseases such as myocardial ischemia and acute myocardial infarction. Low results may be diseases: high pulmonary hypertension results may be diseases: myocardial infarction precautions Forbidden before examination: Pay attention to normal eating habits and pay attention to personal hygiene. Requirements for inspection: Actively cooperate with the doctor. Inspection process The maintenance of normal human pulmonary circulation is mainly related to pulmonary artery and venous pressure and blood flow. These are affected by hydrostatic force. When the body position changes, the effect of gravity directly leads to the change of hydrostatic force, that is, the blood flow can be caused when the body position changes. Redistribution. The position change of patients with pulmonary hypertension has little effect on the changes of blood flow in the lung field. Therefore, the degree of pulmonary hypertension can be determined by quantitative analysis of lateral perfusion lung imaging. The general patient first took the left lateral position, intravenous injection of 99Tcm-MAA, using ROI technology to calculate the ratio of right lung to left lung radioactivity count (Lt) in the left lateral position; then take the right lateral position, the same dose of 99Tcm-MAA, In the same method, the two lungs were counted, and the two lung counts in the left lateral position were subtracted, and the two lung counts in the right lateral position were obtained. Then, the right lung and left lung radioactivity were obtained in the right lateral position. Count the ratio of t (Rt) and finally calculate the Rt/Lt value. At pulmonary hypertension, the Rt/Lt value decreases, and the diagnostic reference value is Rt/Lt value <1.64. Not suitable for the crowd Inappropriate crowd: No. Adverse reactions and risks Nothing.

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