CAJ | 학술논문

目的研究计算机X射线摄影(CR)中剂量指示值与受检者入射体表剂量之间的关系,建立受检者入射体表剂量的估算方法.方法以Kodak的CR系统为研究对象,基于理论推导建立受检者入射体表剂量估算模型,通过实验测量确定模型中的重要参数,建立由剂量指示值估算入射体表剂量的方法,并通过实验验证其有效性.结果用本研究建立的模型计算出的受检者入射体表剂量与实测值之比的平均值为0.97,95％可信区间为0.77～1.18；在比较不同X射线摄影系统时,发现计算值与实测值之间的差异没有统计学意义.结论本研究建立的由剂量指示值估算受检者入射体表剂量的模型,可用于快速评估计算机X射线摄影所致受检者的入射体表剂量.
목적 연구계산궤X사선섭영(CR)중제량지시치여수검자입사체표제량지간적관계,건립수검자입사체표제량적고산방법.방법 이Kodak적CR계통위연구대상,기우이론추도건립수검자입사체표제량고산모형,통과실험측량학정모형중적중요삼수,건립유제량지시치고산입사체표제량적방법,병통과실험험증기유효성.결과 용본연구건립적모형계산출적수검자입사체표제량여실측치지비적평균치위0.97,95％가신구간위0.77～1.18；재비교불동X사선섭영계통시,발현계산치여실측치지간적차이몰유통계학의의.결론 본연구건립적유제량지시치고산수검자입사체표제량적모형,가용우쾌속평고계산궤X사선섭영소치수검자적입사체표제량.
Objective To study the relationship between the dose indicator of computed radiography (CR) and the entrance surface dose (ESD),and to build a model for estimating ESD based on this relationship.Methods Taking Kodak CR system as the research object,a theoretical model for estimating the ESD was established according to theoretical derivations,and the key parameters in the model were determined through experiments in a CR system.Further experiments in another CR system were also conducted to verify the model.Results The ESDs were not only dependent on the dose indicator provided by the CR system,but also influenced by other factors,such as tube potential,patient's body thickness and energy response of the imaging plate.The estimation results of the model agreed well with the experiment results,and the relative deviation was confirmed within 20％.Conclusions The dose indicator based model can provide a relatively fast and easy way for evaluating the doses of patients undergoing X-ray diagnoses with the CR system.