CAJ | 학술논문

目的：探讨自动管电压选择技术(ATVS)在不同体质量指数(BMI)患者腹部增强 CT 扫描中的应用价值。方法160例腹部增强 CT 扫描患者按扫描时间随机分为实验组80例(自动管电压选择技术)和对照组80例(常规120 kVp),再根据 BMI 值分为4个亚组(A：BMI<18.5 kg/m2；B：BMI 18.5~23.9 kg/m2；C：BMI 24~28.9 kg/m2；D：BMI ≥29 kg/m2)。对各组图像质量进行评分,并采用秩和检验进行比较；记录动脉期和静脉期图像的噪声及各部位对比噪声比(CNR),并采用方差分析进行比较；观察对照组和实验组的辐射剂量,并采用 t 检验进行比较。结果实验组78.75%患者管电压自动调节为100 kVp,分布于 A~D 亚组,分别占60%(6/10),80%(24/30),90%(27/30),60%(6/10),平均 BMI(23.71±3.19)kg/m2。实验组 A~C 亚组有效剂量较对照组分别下降约35.09%、27.61%、19.08%(t=3.829、4.389、2.238,P =0.005、<0.001、0.025)。实验组图像噪声较对照组稍增高,但总体图像质量可接受。结论自动管电压选择技术可降低 BMI<28.9 kg/m2患者腹部增强 CT 扫描的辐射剂量。
목적：탐토자동관전압선택기술(ATVS)재불동체질량지수(BMI)환자복부증강 CT 소묘중적응용개치。방법160례복부증강 CT 소묘환자안소묘시간수궤분위실험조80례(자동관전압선택기술)화대조조80례(상규120 kVp),재근거 BMI 치분위4개아조(A：BMI<18.5 kg/m2；B：BMI 18.5~23.9 kg/m2；C：BMI 24~28.9 kg/m2；D：BMI ≥29 kg/m2)。대각조도상질량진행평분,병채용질화검험진행비교；기록동맥기화정맥기도상적조성급각부위대비조성비(CNR),병채용방차분석진행비교；관찰대조조화실험조적복사제량,병채용 t 검험진행비교。결과실험조78.75%환자관전압자동조절위100 kVp,분포우 A~D 아조,분별점60%(6/10),80%(24/30),90%(27/30),60%(6/10),평균 BMI(23.71±3.19)kg/m2。실험조 A~C 아조유효제량교대조조분별하강약35.09%、27.61%、19.08%(t=3.829、4.389、2.238,P =0.005、<0.001、0.025)。실험조도상조성교대조조초증고,단총체도상질량가접수。결론자동관전압선택기술가강저 BMI<28.9 kg/m2환자복부증강 CT 소묘적복사제량。
Objective The purpose of this study was to evaluate the effect of patient’s body mass index on applications of auto-matic tube voltage selection (ATVS)for contrast-enhanced abdominal CT.Methods 1 60 patients underwent contrast-enhanced ab-dominal CT scan were assigned into the study group (ATVS technique)and the control group (120 kVp)with equal size (both n =80)according to the scanning mode.The two groups were both divided into four subgroups according to BMI (A:BMI <18.5 kg/m2 ;B:BMI 18.5~23.9 kg/m2 ;C:BMI 24~28.9 kg/m2 ;D:BMI ≥29 kg/m2 ).Image quality were assessed and compared with Rank-sum test.Analysis of variance was used to compare differences in mean contrast-to-noise ratio (CNR)and image noise a-mong the two groups.Two sample t tests were used to compare the radiation dose.Results In the study group,tube voltage of 100 kVp were selected highest(78.75%)and distributed from subgroups A to D,accounting for 60%,80%,90% and 60% respectively, with average BMI of (23.71±3.1 9)kg/m2 .Compared to control group,the effective dose of study group from subgroups A to C re-duced by 35.09%,27.61% and 1 9.08% respectively(t=3.829,4.389,2.238,P =0.005,<0.001,0.025).Despite the higher image noise in study group,the overall image quality was acceptable.Conclusion The contrast-enhanced abdominal CT with AVTS technique can reduce radiation dose in patients with BMI smaller than 28.9 kg/m2 .