CAJ | 학술논문

目的：探讨能谱 CT 小剂量对比剂团注试验法（test bolus）在肺动脉 CT 血管造影术（CTA）成像中的可行性。方法收集43例怀疑肺动脉栓塞的患者行肺动脉 CTA。按登记号尾数单双数分为研究组23例、对照组20例。研究组采用能谱扫描模式，使用小剂量对比剂团注试验法；对照组使用常规剂量对比剂智能动态跟踪（smartprep）技术。研究组采用最佳对比噪声比（CNR）技术，两组分别测量肺动脉主干及左、右肺动脉干 CT 值并进行比较。采用5分法对图像质量评分并比较。结果研究组与对照组肺动脉主干 CT 值分别为（387．92±48．18）Hu、（326．95±48．51）Hu，差异有统计学意义（P ＝0．000）。左肺动脉干 CT 值分别为（390．19±57．91）Hu、（341．04±34．95）Hu，差异有统计学意义（P ＝0．002）。右肺动脉干 CT 值分别为（398．02±55．35）Hu、（312．15±40．16）Hu，差异有统计学意义（P ＝0．000）。图像质量评分分别为（4．61±0．66）分、（3．90±1．02）分，差异有统计学意义（P ＝0．009）。结论能谱 CT 小剂量对比剂团注试验法肺动脉CTA 能够提高图像质量，同时减少对比剂用量。
목적：탐토능보 CT 소제량대비제단주시험법（test bolus）재폐동맥 CT 혈관조영술（CTA）성상중적가행성。방법수집43례부의폐동맥전새적환자행폐동맥 CTA。안등기호미수단쌍수분위연구조23례、대조조20례。연구조채용능보소묘모식，사용소제량대비제단주시험법；대조조사용상규제량대비제지능동태근종（smartprep）기술。연구조채용최가대비조성비（CNR）기술，량조분별측량폐동맥주간급좌、우폐동맥간 CT 치병진행비교。채용5분법대도상질량평분병비교。결과연구조여대조조폐동맥주간 CT 치분별위（387．92±48．18）Hu、（326．95±48．51）Hu，차이유통계학의의（P ＝0．000）。좌폐동맥간 CT 치분별위（390．19±57．91）Hu、（341．04±34．95）Hu，차이유통계학의의（P ＝0．002）。우폐동맥간 CT 치분별위（398．02±55．35）Hu、（312．15±40．16）Hu，차이유통계학의의（P ＝0．000）。도상질량평분분별위（4．61±0．66）분、（3．90±1．02）분，차이유통계학의의（P ＝0．009）。결론능보 CT 소제량대비제단주시험법폐동맥CTA 능구제고도상질량，동시감소대비제용량。
Objective To discuss the feasibility of test bolus (TB)by using low dose contrast agent with spectral CT imaging in CTPA.Methods 43 patients with suspected pulmonary embolism (PE)underwent CTPA were randomly divided into the study group(n =23)and the control group(n =20).The study group using spectrum scanning pattern with small dose of contrast agent injection test method.The control group used conventional dose of contrast medium intelligent dynamic tracing (smartprep)technology.The optimal CNR was used in experimental group.The CT values of main pulmonary artery (MPA),left pulmonary artery (LPA),and right pulmonary artery (RPA)were measured and compared in the two groups,respectively.The image quality was evaluated and compared with 5-point scale.Result The CT values of MPA in experimental group and control group were (387.923 ± 48.184)Hu,and(326.95 ±48.51)Hu ,respectively.The CT values of LPA in experimental group and control group were (390.19 ±57.91)Hu,and(341.04 ±34.95)Hu,respectively.The CT values of RPA in experimental group and control group were (398.02 ±55.35)Hu,and(312.15 ±40.16)Hu,respectively.The average scores of experimental group and control group were (4.61 ±0.66)and(3.90 ±1.02)respectively.The Differences were statistically signifi-cant(P =0.000,0.002,0.000,0.009 respectively).Conclusion Energy spectrum CT with small dose of contrast a-gent injection test pulmonary artery CTA may improve the image quality of CTPA and decrease the dose of contrast agent.