Question: Ventilation-Perfusion Scan Injected Or Inhaled Radioisotopes Readily Provide Information About Pulmonary Blood Flow And Ventilation. Imaging Of The Gamma Radiation From These Isotopes Produces A Picture Showing The Distribution Of Blood Flow And Ventilation Throughout Both Lungs.12 This Test Involves Two Separate Imaging Exams: One For Ventilation With …

Ventilation-Perfusion Scan Injected or inhaled radioisotopes readily provide information about pulmonary blood flow and ventilation. Imaging of the gamma radiation from these isotopes produces a picture showing the distribution of blood flow and ventilation throughout both lungs.12 This test involves two separate imaging exams: one for ventilation with inhaled radioisotopes, and one for perfusion with intravenous radioisotopes. Indications for a ventilation- perfusion scan (VQ scan) include the diagnosis of a suspected pulmonary embolus and the assessment of regional lung function.35 KNOWLEDGE CHECK QUESTIONS True or False: An upper airway obstruction may be apparent on an anteroposterior neck x-ray view. True or False: The lungs appear more radiopaque than normal when the CXR is underexposed. True or False: CT scan slices are 1-2 mm in thickness True or False: Ultrasonography cannot be used on patients with metal implants. True or False: A pulmonary embolus may be identified using a VQ scan.