الفهرس | Only 14 pages are availabe for public view |
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 92 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 . |