الفهرس 
Introduction
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Abstract
Pulmonary embolism is one of the most common emergencies and is considered one of the life threatening conditions. Its diagnosis is considered slightly difficult due to wide spectrum of non-specific signs and symptoms.
So, any pregnant patient, a patient with impaired kidney function or a patient known to have allergy to iodinated contrast are contraindicated to do contrast enhanced CTPA to diagnosis of PE .
Non-contras Magnetic resonance pulmonary angiography (MRPA) is a new method with advantage of radiation avoidance and without the using of nephrotoxic contrast material.
The aim of our study was to assess of the sensitivity and specificity of MRI with non-contrast MRPA in detection of acute PE in comparison with CTPA.
In our study, radiologists interpreted and analyzed the imaging data of 50 patients who met the inclusion criteria and performed non-contrast MRPA.
The main, lobar , segmental and subsegmental branches were observed and recorded as positive and negative for PE using the CTPA as the reference modality.
Results were collected and compared together and the sensitivity and specificity of the MRPA were calculated according to the site of the PE either main pulmonary artery , lobar , segmental or subsegmental branches.
We conclude that the non-contrast MRPA has a reasonable sensitivity and specificity in the diagnosis of PE especially in major pulmonary branches (100 %). So, it can be used as an alternative to the CTPA especially when the CTPA and the use of gadolinium are contraindicated.
Also , We conclude that non contrast MRI offers a means of diagnosing PE without intravenous contrast material or radiation, although further study is necessary before it can be considered a routine tool in the evaluation of the patient with suspected PE. It is our hope that with the increased availability of MRI in the emergency setting and growing concern over radiation exposure, this technique will be used in patients with contraindications to ionizing radiation or intravenous contrast.