The value of high pitch technology of dual-source CT in postoperative follow-up of endovascular graft exclusion to aortic dissection / 实用放射学杂志

ABSTRACT

Objective To evaluate the characteristics and the value of dual-source CT single-energy high pitch scanning technology in postoperative follow-up of endovascular graft exclusion to DeBakey Ⅲ aortic dissection.Methods All of 58 patients with endovas-cular graft exclusion to Debakey Ⅲ aortic dissection underwent dual-source CT checkup.30 patients (group A)were scanned with single-energy high pitch technology,voltage 120 kV,pitch 3.2;28 patients (group B)were scanned with dual-energy standard pitch technology,voltage 100 kV and 140 kV,pitch 1.0;both groups were used CareDose4D technology to automatically track the cur-rent.Image post-processing was completed at the workstation.The stent condition,endoleak and residual dissection were observed and analyzed.The differences of image quality and radiation dose between two scanning modes were compared.Results All of 58 cases,postoperative conditions to 9 cases were perfect,the proportion was 1 5.52%;43 cases were with distal residual dissection,the proportion is 74.14%;and 12 cases were accompanied with endoleaks,the proportion was 20.69%.The endoleaks manifestation in-cluded punctuate,band-like,and patchy high density around the stent in enhanced images.The difference of scan length between group A and group B was not statistically significant,the image quality of both groups met excellent standard .The acquisition time and effective radiation dose to group A were 1/4 and 56% of group B respectively.the differences of both groups were statistically significant.Conclusion Dual-source CT with single-energy high pitch scanning technology can ensure image quality and significantly reduce the effective radiation dose,it is a more advantageous scanning mode.