Describe the physiological principles which underpin pulmonary embolism (PE) imaging with ventilation/perfusion (V/Q) scintigraphy. Contrast this with the diagnosis of PE by CT pulmonary angiography. What are the advantages and disadvantages of the two te

the question is Describe the physiological principles which underpin pulmonary embolism (PE) imaging with ventilation/perfusion (V/Q) scintigraphy. Contrast this with the diagnosis of PE by CT pulmonary angiography. What are the advantages and disadvantages of the two techniques (including SPECT and planar). Describe an algorithm which optimizes appropriate application of these techniques while minimising patient risk. referencing should be in Vancouver style and up-to-date. -All the part of question should be discussed.