Usefulness of triphasic CT aortic angiography in acute and surveillance: Our experience in the assessment of acute aortic dissection and endoleak

Abdominal vessel depiction on virtual triphasic spectral detector CT: initial clinical experience

“…Majority of routine abdominopelvic CT scans are performed as monophasic examinations, yet acquisition of additional unenhanced and arterial phase images may be required for specific indications such as renal donor evaluation or dedicated vascular assessment (e.g., for evaluation of endoleaks of abdominal aortic aneurysm repair or active bleeding) [6,16]. Whereas the use of DECT-derived VNC and VMI has mostly been investigated separately [8,11,14,[17][18][19] while the combination of these reconstructions for abdominal vessel assessment in spectral detector CT (SDCT) has not been studied yet.…”

Relationships between patient characteristics and contrast agent dose for successful computed tomography venography with a body-weight-tailored contrast protocol

“…However, previous reports have suggested the usefulness of computed tomography angiography (CTA) for the evaluation of vascular stenosis and vascular dissection. [ 5 , 6 ] Generally, venous enhancement is significantly lower than arterial enhancement on enhanced CT, and the degree of venous enhancement on CT venography (CTV) is important for a DVT diagnosis. Earlier reports suggested that higher venous attenuation on CTV images can be achieved with a high concentration of iodine contrast medium, a larger volume of contrast medium, or with low tube-voltage- or optimal scan-delay techniques.…”

Image Predictors of Treatment Outcome after Thoracic Aortic Dissection Repair

“…Two contrast-enhanced acquisitions would be optimal in most cases to evaluate the dynamics of flow in the true and false lumina. Increasing the frequency of dataset acquisition by using time-resolved CT angiographic protocols has been suggested to enhance the delayed fillings between the true and false lumina, to evaluate the degree of true lumen collapse, to demonstrate dynamic occlusion of aortic branches, and to measure perfusion delay in arteries originating from the false lumen (12,13). In the clinical setting, routine application of time-resolved CT angiography is limited because of the radiation exposure imposed by long anatomic coverage and the fact that time-resolved MR angiography or volumetric phase mapping may provide better dynamic information, when indicated.…”

“…Certain important predictive parameters of descending aorta enlargement need to be specifically addressed at follow-up imaging studies (18)(19)(20). These imaging risk factors predictive of the enlargement of the descending aorta are (a) a large primary intimal tear (>10 mm) in the proximal descending aorta; (b) a descending aortic diameter of more than 35 mm; (c) a false lumen diameter of more than 22 mm in the proximal descending aorta; (d) a false lumen diameter of more than two-thirds of the total descending aortic diameter; (e) a partially thrombosed distal false lumen, as opposed to a patent or completely thrombosed false lumen; (f) a distal suture line leak (in a primarily repaired type A dissection); and (g) helical flow in the false lumen (11)(12)(13)21). The extent of the aortic dissection and the involvement of supra-aortic branches have also been described as predictive of secondary aortic dilatation (20).…”