The Diagnositic Value Of64Spiral CT Angiography In Assessing Aortic Dissection

ObjectiveTo investigate the value of64-slice spiral CT angiography(CTA) in diagnosising ofaortic dissection(AD) and the Clinical application before rinterventional operation.MethodsSixty-five patients with clinically proved aortic dissection were retrospectivlyanalysed. All those raw datas was performed on the post-processing workstation forimage post-processing. For25patients with interventional therapy, we measure thedistance between the break and left subclavian artery and the maximum aortic diameterat the levels of the break, and those measurements were comparable with DSA-relateddata. All the AD information was diagnosed by two experienced radiologists, the datasof25patients with interventional treatment were assessed by two experiencedinterventional Radiologist.Results(1)65cases shows the rupture location,65cases of dissecting aneurysm of thefalse lumen can be displayed.(2)21DeBakey type I,1DeBakey type II and43DeBakey type III.4innominate artery,6left common carotid artery,6Left subclavianartery,11superior mesenteric artery,11celiac trunk artery,8right renal artery,9leftrenal artery and19iliac artery were involved respectively.(3) There was a significantdifference of mean CT value between true and false lumen(287.2±50and263.2±47.2,respectively). The distance between break and left subclavian artery was4.05±1.01cm and4.06±1.06cm derived from CTA and DSA,respectively. At the levelsof the break, the maximum aortic diameter was3.07±0.41cm and3.01±0.43cmmeasured by CTA and DSA. No statistically differenence was found by comparison oftwo methods. Conclusion64-slice spiral CT is of significant value in quick and accurate diagnosis of aorticdissection,it also can assess patients who were ready for interventionaloperation.Accurate measurements of the distance between left subclavian artery andaortic rupture, aortic diameter on break levels provides important imaging basics forclinical treatment.