CT pulmonary angiography (CTPA) is currently considered as the first-line modality and the reference standard for PE diagnosis due to its high diagnostic accuracy (8,9). Radiation burden is very favourable (1.1–1.5 mSv) compared with CTPA and makes the VQ scan very useful in pregnancy and younger patients. When used with conventional pulmonary angiography, CTPA helps show the extent of disease and can contribute to operability assessment. CT pulmonary angiography (CTPA) will show filling defects within the pulmonary vasculature with acute pulmonary emboli. Computed tomography pulmonary angiography (CTPA) is used for diagnosis. It is often believed to be overutilised with few recent studies showing a yield of less than 2%. from CT pulmonary angiography and scintigraphy. Pregnant and postpartum women are two to four times as likely as nonpregnant patients have venous thromboembolism [1–3].Deep venous thrombosis (DVT) is more common than PE, and postpartum women are at higher risk than pregnant women [].Ultrasound is well-established as the technique of choice for diagnosing DVT. Computed tomography pulmonary angiography (CTPA) is the radiological diagnostic method. In chronic PE, pulmonary angiography is used for surgical planning prior to pulmonary endarterectomy. It is a preferred choice of imaging in the diagnosis of PE due to its minimally invasive nature for the patient, whose only requirement for the scan is an intravenous line. It is regarded as a highly
sensitive and specific test for pulmonary embolism.
3. In the last decade, computed tomographic pulmonary angiography (CTPA) was introduced as an alternative noninvasive test to diagnose pulmonary embolism. CT pulmonary arteriography (CTPA) is evolving as the predominant noninvasive modality for the diagnosis of pulmonary embolism. The role of diagnostic imaging in PE is being increasingly undertaken by computed tomography pulmonary angiography (CTPA). Spiral computed tomography pulmonary angiography (CTPA) is the most frequently used imaging modality for detecting PE in modern clinical practice. Diagnostic algorithms using either CTPA or V/Q scanning have proven to be comparably safe to exclude the diagnosis of pulmonary embolism. Ventilation–perfusion (V/Q) scintigraphy has a high sensitivity to detect embolic disease but its value has been challenged with the emergence of multidetector CT pulmonary angiography (CTPA). Objectives: Pulmonary thromboembolism (PTE) is an emergent disease with high mortality. Step by step tutorial on how to interpret a CT Pulmonary Angiogram (aka CTPA or PE Study). Pulmonary angiography can be used in a diagnostic dilemma, although CTA is the clinically preferred method. Results: Of the 161 professionals surveyed, 93 (58%) appreciated correctly that V/Q scintigraphy delivers a higher fetal dose than does CT pulmonary angiography. Introduction. Further imaging may be necessary, either repeating CTPA with an increased delay or pulmonary angiography. This study aimed to determine the overall positivity rate of CTPA examinations and understand the factors that affect the yield of the CTPA examination. It is not the gold standard investigation, but is becoming more widely accepted as the standard non-invasive investigation of choice for determining the presence or absence of emboli (clots) in the pulmonary (lung) vessels. As documented in the Royal College of Radiologists referral guidelines (Ref. The emergency physician does not want to miss possible pulmonary embolism (PE) but is concerned about ordering computed tomography pulmonary angiography (CTPA) or a ventilation-perfusion (VQ) scan.