Aims and objectives
Aortic computed tomography angiography (CTA) has become the standard of reference in the diagnosis and follow up of aortic diseases [1-3].
Time-resolved aortic CTA (TR-CTA) might offer more information regarding the dynamics of contrast enhancement in some pathologies,
such as dissections and endoleaks after endovascular repair.
there were still some disadvantages in the application of time-resolved technique in aortic CTA,
on a 1 st or 2 nd generation dual source CT,
such as limited...
Methods and materials
Patient population: 12 patients who were clinically referred to radiology department for aortic CTA were included in the study.
The patients were referred for follow up of aortic aneurysm,
or aortic dissection,
and had undergone an earlier bi-phase high-pitch dual source CTA within half a year. Data acquisition: All patients underwent a time-resolved aortic CTA (8 phases,
temporal resolution 2.5s/scan,
scan range 63cm,
40mL Ioversol 370mgI/ml and 50mL 0.9% saline,
Among 12 patients,
8 patients underwent TR-CTA for follow up of aortic aneurysm,
4 for follow up of dissection.
Totally 4 endoleaks were detected.
TR-CTA detected 2 endoleaks which were missed in high-pitch dual-source CTA,
which were both type II endoleaks.
Fig1-4 showed the dynamic filling of a type II endoleak in an 33-year-old female,
treated with a stent because of aortic dissection. Radiation dose: Mean ED of TR-CTA (7.81±0.00mSv) was higher than the bi-phase high-pitch CTA protocols...
TR-CTA consisting of whole aorta using a 3rd generation dual source CT can obtain a sufficient image quality with acceptable radiation dose,
and is feasible for follow-up of aortic aneurysm and aortic dissection.
MD Radiology department,
Peking Union Medical College Hospital 1 Shuaifuyuan ,
Dongcheng District Beijing,
China 100730 Phone: 8610 69159576 e-mail: firstname.lastname@example.org
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