Abstract：Objective To explore the clinical value of 70 kVp tube voltage combined with high-strength deep learning image
reconstruction (DLIR-H) technology in reducing both radiation and contrast doses in coronary CT angiography (CCTA). Methods A total
of 72 patients required to undergo CCTA were prospectively enrolled and randomly divided into two groups A and B, with 36 cases
in each group. Group A (n=36) used the new scan protocol: 70 kV, smart mA adjustment technolegy, noise index (NI) of 30 HU,
contrast dose of 16 mgI/(kg·s), DLIR-H reconstruction. Group B used the conventional scan protocol: 120 kV, smart mA
adjustment technolegy, NI of 22 HU, contrast dose of 32 mgI/(kg·s), 50% ASIR-V reconstruction. The contrast injection rate was
adjusted for 10 s injection duration. The image quality of the two groups were evaluated subjectively and objectively. The subjective
image quality was evaluated by 5-point system (5=best). Image noise, contrast-noise-ratio (CNR) and signal-noise-ratio (SNR) for
vessels were measured to evaluate the objective image quality. Results The image quality in the two groups fully met the diagnostic
requirements. The subjective score of image quality in group A was better than that in group B, and the difference was statistically
significant (P<0.001). The standard deviation of background noise in group A (12.36±2.86) was significantly lower than those in
group B (19.06±2.43), and the difference was statistically significant (P<0.001). The SNR in right coronary artery (RCA), left
anterior descending (LAD) and left circumflex (LCX) in group A (36.40±11.71, 35.01±10.95, 35.32±11.33) were significantly
higher than those in group B (20.77±3.76, 20.33±3.46, 20.15±3.34). The differences were statistically significant (P<0.001). The
CNR of RCA, LAD and LCX in group A (48.47±13.61, 47.08±12.72, 47.38±13.12) were significantly higher than those in group
B (26.25±4.79, 25.82±4.54, 25.64±4.15), the differences were statistically significant (P<0.001). The average contrast dose were
(22.87±4.06) mL and radiation dose was (0.82±0.15) mSv in group A, which were 53% and 63.2% reduction compared with the
(48.64±7.09) mL and (2.23±0.93) mSv in group B, respectively. Conclusion The use of 70 kVp tube voltage combined with
DLIR-H algorithm for CCTA in normal size patients significantly reduces radiation dose and contrast medium dose while improves
image quality compared with the conventional scan protocol.
文雨婷，李万江，李真林，潘雪琳，帅桃，刘嘉丽. 超低管电压联合DLIR-H算法在冠脉CT血管成像“双低”扫描中的应用价值[J]. 中国医疗设备, 2022, 37(2): 78-81.
WEN Yuting, LI Wanjiang, LI Zhenlin, PAN Xuelin, SHUAI Tao, LIU Jiali. Application Value of Ultra Low Tube Voltage Combined with DLIR-H Algorithm in Reducing
both Radiation and Contrast Doses in Coronary CT Angiography. China Medical Devices, 2022, 37(2): 78-81.
