A<unk><unk> <unk>  (otherwise known as V/Q<unk>  or lung scintigraphy) is a study which shows whether an area of the lung is being ventilated with oxygen and perfused with blood. In the setting of a pulmonary embolism (PE),<unk>  can be obstructed due to the formation of a clot. The<unk><unk> <unk>  is less commonly used due to the more widespread availability of computed tomography (CT) technology, however it may be useful in patients who have an allergy to iodinated contrast. It may also be useful in pregnant patients in an attempt to minimize radiation exposure.  The diagnostic value of the results of the V/Q<unk>  is improved when combined with the clinical pretest probability of PE. A high probability<unk>  coupled with a high clinical pretest probability of PE is diagnostic for PE, while a normal<unk>  regardless of the clinical pretest probability excludes PE. For the majority of the cases of suspected PE, however, the<unk><unk> <unk>  does not establish the diagnosis nor exclude PE and further tests are required.
Pulmonary embolism ventilation/perfusion scan
Pulmonary embolism compression ultrasonography
Pulmonary embolism MRI
Pulmonary embolism CT
Pulmonary embolism echocardiography
Farmer's lung CT
Pulmonary hypertension CT
Pulmonary nodule CT