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 to segmental anatomy of the lung
Large (>75%), moderate (25~75%), small (<25%)
A branching lung network model
(MRI-based)

2. 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

3. V/Q scan Normal 99mTc-MAA perfusion & 81mKr ventillation
Matching perfusion & ventillation defect
Scintigraphic image of
pulmonary embolism

6. Perfusion Scintigraphy planar technique

7. Perfusion Scintigraphy planar technique

8. Perfusion Scintigraphy SPECT technique

9. Lung uptake ratio before planned pulmonectomy

10. Ventilation Scintigraphy planar technique

11. Pulmonary artery agenesia

12. 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