الفهرس 
ANATOMY OF THE AORTAOnly 14 pages are availabe for public view
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Abstract
Aortic dissection is considered the most common and lethal of the acute
aortic disorders , unless diagnosed and treated quickly, aortic dissections
are frequently fatal, and patients may die before receiving treatment .
Symptoms on presentation include chest pain radiating to the back ,
syncope ,and shortness of breath .so clinical presentation mimic
mycordial infarction , pulmonary embolism , and other conditions .
Initial chest X ray may revealed primitive data which guide the need for
further investigation .yet normal chest X ray do not exclude the presence
of aortic dissection .
MDCT allows scanning with greater speed and narrower collimation
compared with single-detector helical CT systems, which translates to
larger volumes of coverage with improved spatial resolution and provides
very high quality diagnostic images.
Multidetector-row CT aortography (MDCTA) possesses several
advantages over other modalities used to investigate thoracic aortic
disease, such as trans-esophageal echography, MR angiography, and
catheter angiography. Compared with trans-esophageal echography TEE ,
faster , easier , non invasive ,non operator dependent ,and available a
round the clock basis. Compared with MRA , faster ,easier ,and
available a round the clock basis. Compared with catheter angiography
SUMMARY AND CONCLUSION
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non invasive , faster, less costly , not require an angiographic team, and
luminal and extraluminal orientation .
The volumetric data obtained with MDCTA is readily processed using
two-dimensional, three-dimensional, or volume-rendering techniques to
provide angiogram-like images or images in any desired plane or
obliquity.
Although scan quality is usually excellent, special attention to various
technical parameters is required to optimize image quality. Familiarity
with diagnostic pitfalls and the common findings in aortic dissection is
necessary for accurate diagnosis.
MDCT is currently the imaging technique of choice for diagnosis and
evaluation of aortic dissection .