1. Department of Radiology, The Affiliated Hospital of Xuzhou Medical University, Xuzhou Jiangsu 221002, China; 2. Department
of Radiology, The Affiliated Huai'an Hospital of Xuzhou Medical University, Huai’an Jiangsu 223002, China
Abstract:Objective To explore the feasibility and value of double low model for superior mesenteric artery CTA in patients with
medium and small body mass index. Methods A total of 80 patients who underwent superior mesenteric artery CTA examination
between September 2017 and March 2018 were prospectively analyzed. They were randomly divided into two groups (conventional
group and double low group), with 40 cases in each group receiving routine and double low scheme scanning, respectively. In the
conventional group, the tube voltage was 120 kV, 250 mA, 320 mgI/mL iodobutol, while in the double low group, the tube voltage
was 80 kV, automatic tube current 40-440 mA, and 270 mgI/mL iodoxacol. The total amount of contrast agent was calculated according to
the patient's weight (1.0 mL/kg), and the injection rate was 3.5 mL/s. Routine and double low program scans were performed respectively. The
image quality was evaluated subjectively, and CT values of the right renal artery level abdominal aorta, superior mesenteric artery,
and left lateral spinal muscle were measured, and the signal-to-noise ratio (SNR), contrast to noise ratio (CNR), and image sensitivity
of the superior mesenteric artery and radiation dose and iodine load in patients were calculated. Wilcoxon rank sum test and independent
sample t test were used. Results There was no statistically significant difference in subjective ratings of images between the two
groups (P<0.05). There was no significant difference in CT value between the two groups of contrast agents (P<0.05). The concentration of
contrast agent, iodine flow rate and total iodine intake were reduced by 15.63% (50/320), 15.63% (175/1120) and 15.98% (3.09/19.34),
respectively. The differences were statistically significant (P<0.05). The CT value of the superior mesenteric artery and the abdominal
aorta were respectively increased by 43.03% (132.45/307.79) and 47.12% (152.01/322.58), and the differences were statistically significant
(P<0.05). The SNR, CNR and figure of merit (FOM) of the two groups increased by 19.16% (1.23/6.42), 28.11% (1.47/5.23) and
623.56% (11.91/1.91), and the differences were statistically significant (P<0.05). There were no statistical differences between the
two groups of personality parameters (sex ratio, age, weight, BMI) and scanning range. The CTDIvol (mGy), DLP (mGy·cm) and ED(mSv) of the two groups were reduced by 76.76% (11.43/14.89), 77.91% (599.82/769.81) and 77.92% (9/11.55), and there was
a statistical difference (P<0.05). Conclusion The low-ray dose and low-concentration contrast medium are feasible for superior
mesenteric artery CTA in patients with medium and small body mass index. The requirements of clinical diagnosis of superior
vascular image can be obtained, and greatly reduce inspectors effective radiation dose, iodine flow rate, total iodine intake and
nephrotoxicity.
陈万洪1,2,单奔2,徐敏2,林千早2,周寒松2,徐凯1. 双低模式在中小体质指数患者肠系膜上动脉CTA中的应用研究[J]. 中国医疗设备, 2019, 34(4): 91-94.
CHEN Wanhong1,2, SHAN Ben2, XU Min2, LIN Qianzao2, ZHOU Hansong2, XU Kai1. Application Research of Double-Low Model in Superior Mesenteric Artery CTA in Medium
and Small Body Mass Index Patients. China Medical Devices, 2019, 34(4): 91-94.