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A VQ scan involves two types of scans: ventilation and perfusion. The ventilation scan shows where air flows in your lungs. The perfusion scan shows where blood flows in your lungs. ... Both scans use radioisotopes (a low-risk radioactive substance). For the ventilation scan, you inhale a small amount of radioisotope gas.
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www.nhlbi.nih.gov/health/dci/Diseases/lvq/lvq_whatis.ht...
www.nhlbi.nih.gov/health/dci/Diseases/lvq/lvq_whatis.html
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Ventilation-Perfusion Scan or "V-Q Scan" ... The ventilation-perfusion scan is a nuclear scan so named because it studies both airflow (ventilation) and blood flow (perfusion) in the lungs. The initials V-Q are used in mathematical equations that calculate airflow and blood flow.
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www.health.harvard.edu/diagnostic-tests/ventilation-per...
www.health.harvard.edu/diagnostic-tests/ventilation-perfusion-scan.htm
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During the perfusion scan, a health care provider injects radioactive albumin into your vein. You are placed on a movable table that is under the arm of a scanner. The machine scans your lungs as blood flows through them to find the location of the radioactive particles.
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www.umm.edu/ency/article/003828.htm
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The PPV of a very low probability interpretation of the V/Q scans was 36 of 440 patients (8.2%). Among patients with suspected pulmonary embolism who had a low clinical probability objective clinical assessment and a very low probability V/Q scan, the PPV was 8 of 259 patients (3.1%). Among women 40 y, the PPV of the...
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jnm.snmjournals.org/cgi/content/abstract/48/9/1411
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Image interpretations of CTA, DSA, and V/Q scans were based on agreement of two PIOPED II readers from centers other than that at which the image was obtained. They were given only the imaging studies with no other clinical or imaging information.
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jnm.snmjournals.org/cgi/content/full/48/9/1411
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V/Q Scans — Not Obsolete Just Yet ... In this study, V/Q scanning had excellent specificity and reasonable sensitivity, making it an appropriate imaging procedure for evaluation of pulmonary embolism in patients for whom CT angiography is contraindicated...
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general-medicine.jwatch.org/cgi/content/full/2008/313/5
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In this paper a fully automatic method for the diagnosis of pulmonary embolism from V/Q-scans is presented. Image analysis is applied to the ventilation and the perfusion images obtained in the V/Q-scan.
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www.maths.lth.se/matstat/staff/attila/MEDIA.html
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However, there is an increased of incidence of diagnosis of PE using CTPA compared to V/Q scan, which raises the question whether these excess emboli detected need antocoagulation therapy or not and may need to unnecessary anticoagulation. ... » CT Pulmonary Angiography and V/Q Lung Scans Similarly Accurate for Excluding P...
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medicine.com.my/wp/?p=2916
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There is a small exposure to radiation from the radioisotope. The radioisotopes used during scans are short-lived. All of the radiation leaves the body in a few days. However, as with any radiation exposure, caution is advised for pregnant or breast-feeding women.
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www.nlm.nih.gov/medlineplus/ency/article/003828.htm
www.nlm.nih.gov/medlineplus/ency/article/003828.htm
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