Current status of ventilation-perfusion scintigraphy for suspected pulmonary embolism

20170301
First Author: Metter DF, Last Author: Freeman LM
"The optimal tracer for ventilation studies is Technegas, an ultra fine dispersion of 99mTc-labeled carbon. [...] Its main advantage is greater percentage deposition in the alveolar spaces and less undesirable adherence to the central airways, compared with droplet radioaerosols."
AJR Am J Roentgenol 2017; 208(3): 489-494