Pinggui Lei, Presenter: Nothing to Disclose

Xiaoying Wang MD, Abstract Co-Author: Nothing to Disclose

Yufeng Xu, Abstract Co-Author: Nothing to Disclose

Jianxin Liu, Abstract Co-Author: Nothing to Disclose

zhongxu bi, Abstract Co-Author: Nothing to Disclose

The purpose of this study was to assess the imaging quality and radiation dose of dual energy CTA of renal artery compared with a standard 120kVp acquisition in patients with renal mass

Twenty-nine consecutive patients performed renal artery CTA were analyzed retrospectively, and divided into DECT group and SECT group. Fifteen patients underwent DECT (tube voltages 80 and Sn140kVp) and were compared with 14 patients underwent standard SECT (120kVp) on the same dual-source scanner. CTDIvol and SSDE were recorded and calculated. Imaging quality was evaluated by two experienced radiologists. For qualitative assessment, whole quality of imaging, detail quality of imaging (sharpness of main renal artery , segmental vessels displayed in MPR and MIP, the relationship between renal lesion and vascular) were evaluated with 5 scale method (1=poor to 5=excellent). For quantitative assessment, CT values were measured in vascular lumen of aorta, renal arteries and psoas major at the almost same level. Background noise (BN) was measured as standard deviation of the surrounding air. CNR and SNR were calculated. P< 0.05 with statistical significant difference.

There was no significant difference for age, sex and weight. Both mean value of CTDIvol and SSDE of DECT group lower than those of SECT group [(9.15±2.20) mGy vs. (15.7±4.08) mGy, P< 0.05; (12.27±1.98) mGy vs. (21.21±4.38) mGy, P< 0.05]. Subjective evaluation for the whole quality of imaging, sharpness of vessels, the relationship between renal lesion and vascular, segmental vessels displayed in MPR and MIP between 2 groups (Z=-2.17, P＞0.05; Z=-2.17, P＞0.05; Z=-2.17, P＞0.05; Z=-2.64, P＞0.05; Z=-2.64, P＞0.05). CT values of abdominal aorta and renal artery in DECT group and SECT group were [(237±33) HU vs. (215±42) HU, P＞0.05)] and [(223±31) HU vs. (197±37) HU, P< 0.05). CNR and SNR were (25.38±7.94 vs. 19.02±5.25, P< 0.05) and (34.73±9.92 vs. 28.23±5.65, P< 0.05).

DE renal artery CTA  was  equivalent of standard SECT acquisitions and thus can be applied for routine diagnostic purpose in patient with renal mass, which provide satisfactory images with significant reduction of radiation exposure.

Dual-source dual-energy CT can achive acceptable image quality and reduce radiation dose compared with single energy CT, which helps its clinical diagnosis and treatment.

Lei, P, Wang, X, Xu, Y, Liu, J, bi, z, Radiation Dose and Imaging Quality of Dual Energy CT Angiography of Renal Artery Compared with a Standard 120kVp Acquisition in Patient with Renal Mass.  Radiological Society of North America 2014 Scientific Assembly and Annual Meeting, - ,Chicago IL. http://archive.rsna.org/2014/14013297.html