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Computed Tomographic Angiography (CTA)의 검사 시 조영제 집적 정점시간에 영향을 미치는 특성 인자를 분석
손순룡(Soon Yong Son),최관우(Kwan Woo Choi),정회원(Hoi Woun Jeong),장서구(Seo Goo Jang),정재용(Jae Yong Jung),윤정수(Jung Soo Yun),김기원(Ki Won Kim),이영아(Young Ah Lee),손진현(Jin Hyun Son),민정환(Jung Whan Min) 대한방사선과학회(구 대한방사선기술학회) 2016 방사선기술과학 Vol.39 No.1
Computed tomographic angiography (CTA)의 (조영제 집적 정점시간에 영향을 미치는 특성 인자를 분석하여: analyzing factors influencing on the integrated bolus peak timing in contrast-enhanced) 개인별 정점시간을 계량적(Systems analysis)으로 산정해 검사에 직접 적용함으로써 예비검사(monitoring scan)에 의한 불필요한 방사선 피폭을 예방하는데 목적이 있다. CTA의 예비검사(monitoring scan)을 통해 얻은 조영제 집적 정점시간과 개인별 측정치들 간의 상관관계분석을 통해 영향인자를 파악한 다음, 다중선형회귀분석에 의한 회귀식으로 적정시간을 산출하였다. 결과로는 CTA의 평균 방사선 노출량은 716.53 mGy・cm였고, 예비검사(monitoring scan) 15.52 mGy (2 ~34 mGy)로 나타났다. 장기별 변환요소(conversion factor)를 적용한 결과, 전체 선량은 평균 1.5 mSv였고, 예비검사 선량은 0.23 mSv로 나타났다. 특성인자의 측정치와 조영제 정점시간의 상관관계분석 결과, 남성은 심박동수에서, 여성은 심박동수와 최저혈압, 혈당에서 음의 상관관계를 보였으며, 통계적으로 매우 유의하였다 (p<.01). 회귀분석결과, 남성은 심박동수가 한 단계 증가할 때마다 -0.160배로, 여성은 최저혈압과 심박동수, 혈당에 따라 각각 -0.004, -0.174, -0.006배로 유의하게 감소하였다. 실측한 조영제 정점시간과 회귀식에 의해 산출된 정점시간의 일치도 검사에서 남여 대상자 모두에서 일치도가 매우 높았다. 본 연구에서는 검사 전에 환자 개인별 조영제 집적 정점시간을 산정하여 적용하면 예비검사를 생략함으로 써 불필요한 방사선피폭을 예방할 수 있을 것으로 사료된다. The objective of this study was to analyze the factors influencing integrated bolus peak timing in contrast-enhanced computed tomographic angiography (CTA) and to determine a method of calculating personal peak time. The optimal time was calculated by performing multiple linear regression analysis, after finding the influence factors through correlation analysis between integrated peak time of contrast medium and personal measured value by monitoring CTA scans. The radiation exposure dose in CTA was 716.53 mGy・cm and the radiation exposure dose in monitoring scan was 15.52 mGy (2 - 34 mGy). The results were statistically significant (p < .01). Regression analysis revealed, a -0.160 times decrease with a one-step increase in heart rate in male, and -0.004, -0.174, and 0.006 times decrease with one-step in DBP, heart rate, and blood sugar, respectively, in female. In a consistency test of peak time by calculating measured peak time and peak time by using the regression equation, the consistency was determined to be very high for male and female. This study could prevent unnecessary dose exposure by encouraging in clinic calculation of personal integrated peak time of contrast medium prior to examination.
김진윤,박선규,윤정수,김항중 대한마취과학회 1995 Korean Journal of Anesthesiology Vol.28 No.5
The proliferation of high-technology infusion devices has greatly influenced the practice of anesthesia by allowing precise delivery intraoperatively and postoperatively of intravenous anesthetics, analgesics, and vasopressors. During continuous drug administration to pediatric patients, unfavorable pharmacologic effects have occured. These effects were attributed to variations in flow from infusion devices. The intent of this investigation was to evaluate the influence of infusion devices on the accuracy and continuity effused fluid. Hartmann's solution was run through eight infusion pump at 5, 10, 15, 20, 25, 30, 40, 60, 80 and 100ml/hr. The volume of the fluid was measured for one hour at each flow rate using a infusion device analyzer(IDA-2) in vitro. Flow accuracy(ml/hr) was calculated by dividing the effused volume by the effusion time ; this value was subsequently expressed as a percentage of the desired flow rate. Flow continuity was expressed by the coefficient of variance(CV); analysis of variance with SAS was used for comparisons. Results were as follows ; 1) The flow accuracy values ranged from 98.8% to 114.2% of the desired rate. 2) Seven infusion pumps had flow rates within 5% of the desired rates at each flow rate but one pump had more than 10% of desired rate. 3) Each of the respective infusion pumps produced various levels of flow continuity and ranged from 0.7% to 2.5%(CV value). Conclusion , further evaluations are needed to differentiate continuity from other infusion devices(e.g., syringe infusion pump) in vitro and evaluations are needed to define the clinical significance in vivo. Future use of flow-rate data will likely be of significant value in establishing policies and procedures for the utilization of infusion devices and guidelines for product selection.