CAJ | 학술논문

目的：探讨低浓度等渗对比剂联合应用80 kV 和自适应统计迭代重建(ASiR)技术,对支气管动脉(BA)CT 血管成像(CTA)的价值。方法随机选取本院40例欲行 CT 增强检查的肺癌患者,18.5 kg/m2≤体质量指数(BMI)≤25 kg/m2。随机分为80 kV、260 mA 及120 kV、150 mA 2组,每组20例,其中80 kV 组为低浓度等渗对比剂(Visipaque 270 mg I/mL),50% ASiR；120 kV 组为高浓度对比剂(Ultravist 370 mg I/mL),滤波反投影(FBP)。比较2组中 BA 的 CT 值、图像噪声(SD)、信噪比(SNR)、对比噪声比(CNR)及有效辐射剂量(ED)。所得结果应用 SPSS 17.0软件采用独立样本 t 检验两两比较,P <0.05有统计学意义。结果80 kV 组的 CT 值(317.33 HU±70.44 HU)高于120 kV 组(256.39 HU±37.38 HU),差异有统计学意义(P <0.05)；80 kV 组 SD、ED 及剂量长度乘积(DLP)[SD (7.55±1.51)HU；ED (1.74±0.14)mSv；DLP (124.94±9.9)mGy/cm]低于120 kV 组[SD (9.36±1.26)HU；ED (3.20±0.35)mSv；DLP (228.82±25.13)mGy/cm],差异有统计学意义(P<0.05)；80 kV 组的 CNR 和 SNR(CNR 59.71±17.36；SNR 44.01±14.71)均优于120 kV 组(CNR 37.61±6.16；SNR 27.75±4.72),差异有统计学意义(P <0.05)。80 kV 组图像质量主观评分(3.73±0.66)略低于120 kV 组(3.81±0.59),但差异无统计学意义(t =-0.558,P >0.05)。结论对于 BMI 在正常范围内的患者,采用低浓度等渗对比剂联合80 kV 和 ASiR 技术行 BA CTA 检查,可在保证 BA 图像质量的同时显著降低有效辐射剂量47%,降低碘用量27%。
목적：탐토저농도등삼대비제연합응용80 kV 화자괄응통계질대중건(ASiR)기술,대지기관동맥(BA)CT 혈관성상(CTA)적개치。방법수궤선취본원40례욕행 CT 증강검사적폐암환자,18.5 kg/m2≤체질량지수(BMI)≤25 kg/m2。수궤분위80 kV、260 mA 급120 kV、150 mA 2조,매조20례,기중80 kV 조위저농도등삼대비제(Visipaque 270 mg I/mL),50% ASiR；120 kV 조위고농도대비제(Ultravist 370 mg I/mL),려파반투영(FBP)。비교2조중 BA 적 CT 치、도상조성(SD)、신조비(SNR)、대비조성비(CNR)급유효복사제량(ED)。소득결과응용 SPSS 17.0연건채용독립양본 t 검험량량비교,P <0.05유통계학의의。결과80 kV 조적 CT 치(317.33 HU±70.44 HU)고우120 kV 조(256.39 HU±37.38 HU),차이유통계학의의(P <0.05)；80 kV 조 SD、ED 급제량장도승적(DLP)[SD (7.55±1.51)HU；ED (1.74±0.14)mSv；DLP (124.94±9.9)mGy/cm]저우120 kV 조[SD (9.36±1.26)HU；ED (3.20±0.35)mSv；DLP (228.82±25.13)mGy/cm],차이유통계학의의(P<0.05)；80 kV 조적 CNR 화 SNR(CNR 59.71±17.36；SNR 44.01±14.71)균우우120 kV 조(CNR 37.61±6.16；SNR 27.75±4.72),차이유통계학의의(P <0.05)。80 kV 조도상질량주관평분(3.73±0.66)략저우120 kV 조(3.81±0.59),단차이무통계학의의(t =-0.558,P >0.05)。결론대우 BMI 재정상범위내적환자,채용저농도등삼대비제연합80 kV 화 ASiR 기술행 BA CTA 검사,가재보증 BA 도상질량적동시현저강저유효복사제량47%,강저전용량27%。
Objective To evaluate the value of low concentration of isotonic contrast agent combined with 80 kV and adaptive statistical itera-tive reconstruction (ASiR)technique for bronchial artery with CT angiography (CTA).Methods 40 patients (18.5 kg/m2 ≤ body mass index(BMI)≤25 kg/m2 )with lung cancer were randomly divided into two groups and performed enhanced chest CT examina-tion.20 patients (low concentration group)were scanned with Visipaque 270mg I/mL,scanning protocol of (80 kV,260 mA)and other 20 patients (high concentration group)were scanned with Ultravist 370 mg I/mL,scanning protocol of (120 kV,1 50 mA). The CT value,signal noise (SD),signal-to-noise ratio (SNR),contrast-to-noise ratio (CNR)and effective dose (ED)of the two groups were compared and analyzed statistically.Differences between the two groups were determined with t test(P <0.05).Results The mean CT value of the low concentration group (31 7.33 HU±70.44 HU)was higher than that of the high concentration group (256.39 HU±37.38 HU)(P <0.05).SD,ED and dose length product (DLP)of the low concentration group (SD:7.55 ±1.51 HU;ED:1.74±0.14 mSv;DLP:124.94±9.9 mGy/cm)were lower than those of the high concentration group (SD:9.36±1.26 HU;ED:3.20±0.35 mSv;DLP:228.82±25.13 mGy/cm)(P <0.05).CNR and SNR of the low concentration group (CNR:59.71± 17.36;SNR:44.01±14.71)were higher than those of the high concentration group (CNR:37.61±6.16;SNR:27.75±4.72)(P <0.05).The subjective scores of the two groups were (3.73±0.66)and (3.81±0.59),respectively,with no statistical difference.Conclusion For the patients with normal body mass index ,it can reduce 47% radiation dose and 27% iodine dosage using low concentration of isotonic contrast agent combined with 80kV and ASiR technique for bronchial artery CTA,while maintaining similar excellent image quality.