V/Q NORMAL IMAGES  (Prepared by: Dr Alejandra Jiménez)

Male 46 year old with high risk for pulmonary embolism (PE). Ventilation-Perfusion Scintigraphy  Study shows homogeneous perfusion in the parenchyma with mild irregularity at the hilum, and the same in ventilation phase. There are no segmental or subsegmental defects. (Coronal slices).
 

Ventilation-Perfusion lung imaging is widely used as the initial screening examination in the diagnosis of PE. This study has a high negative predictive value (NPV) : almost 100%. These is no statistically significant overall diference in diagnostic perfomance between helical  CT and V/Q Scintigraphy
 

References:

1 McDonald WBG et al. Diagnosis of pulmonary embolism: Ventilation perfusion scintigraphy versus helical computed tomography pulmonary angiography. Australasian Radiology (2005) 49: 32-38.

2 Biello DR et al. Ventilation-Perfusion Studies in Suspected Pulmonary Embolism.AJR  1979; 133: 1033-1037.

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