This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: Respiratory System, Subject name: Radiology
The most accurate imaging for the diagnosis of pulmonary embolism is - 
Select and explain. 
A. CT SCAN of chest, B. MRI of chest, C. X - ray chest, D. CT pulmonary angiography
D: CT pulmonary angiography
Answer: D: CT pulmonary angiography 
Explanation: Ans. is 'd' i.e., CT pulmonary angiography o Invasive pulmonary angiography is the most accurate method for diagnosis of PE, it is an invasive procedure. # Investigation of choice for PE - Chest CT with contrast (especially MDCTA) # Investigation of 2nd choice - Lung scan (V/Q scan) # Best investigation for PE - Chest CT with contrast (MDCTA) # Most accurate investigation for PE - Invasive pulmonary angiography # Gold - standard test for PE - Invasive pulmonary angiography # Screening test for PE - D-dimer assay