ventilation – perfusion (v/q) scintigraphy segmental defect occlusion of a branch of a branch of...
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![Page 1: Ventilation – perfusion (V/Q) scintigraphy Segmental defect Occlusion of a branch of a branch of the pulmonary artery Wedge shape and pleural based Conforms](https://reader035.vdocuments.us/reader035/viewer/2022080914/56649f465503460f94c682c8/html5/thumbnails/1.jpg)
Ventilation – perfusion (V/Q) scintigraphy
Segmental defect• Occlusion of a branch of a branch of the pulmonary
artery• Wedge shape and pleural based• Conforms to segmental anatomy of the lung• Large (>75%), moderate (25~75%), small (<25%)
A branching lung network model (MRI-based)
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Ventilation – perfusion scintigraphy
V / Q match• Both scintigrams are abnormal in the same
area, defects of equal size
V / Q mismatch• Abnormal perfusion in the area of normal
ventilation or much larger perfusion abnormality than ventilation defect
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V/Q scan
Matching perfusion & ventillation defect
Scintigraphic image ofpulmonary embolism
Normal 99mTc-MAA perfusion& 81mKr ventillation
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Perfusion Scintigraphy planar technique
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Perfusion Scintigraphy planar technique
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Perfusion Scintigraphy SPECT technique
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Lung uptake ratio before plannedpulmonectomy
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Ventilation Scintigraphy planar technique
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Pulmonary artery agenesia
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Dynamic inhalation lung scintigraphy (DIS)
Normal DTPA clearance
Faster DTPA clearance
Enhanced 99mTc DTPA clearance:• smoking (reversible)• alveolitis• sarcoidosis• pneumonitis• flame inhalation• interstitial pneumonia• lung manifestations of immunological diseases