CAJ | 학술논문

目的通过体模检测和病例检查的对照研究,比较计算机X射线摄影(computedradiography,CR)新旧两种不同成像板(IP)对影像质量和病人辐射的影响,探讨新旧IP的使用原则.方法对新旧IP进行常规暗噪声、均匀性和一致性、擦除完全性检测;根据阈值对比度-细节检测能力(代DD)技术,75 kV 时新旧IP对体模T0.16进行摄影,请3位观察者采用双盲法对所得影像进行观察评分,计算阈值检测指数HT(A);结合临床用相同曝光条件,不同的IP分别对膝关节、胸部、腰椎进行投照,请3位放射专家进行双盲阅片,评价影像质量.结果新旧IP在物理指标上基本相同,在相同曝光条件下,新IP的检测能力高于旧IP,当旧IP提高20%的辐射剂量后,旧IP检测能力接近新IP.结论随着IP使用次数的增加,需逐步提高曝光剂量才能保证影像质量;若保持原有剂量不变,IP的检测能力就会下降,将影响疾病的诊断.
목적 통과체모검측화병례검사적대조연구,비교계산궤X사선섭영(computedradiography,CR)신구량충불동성상판(IP)대영상질량화병인복사적영향,탐토신구IP적사용원칙.방법 대신구IP진행상규암조성、균균성화일치성、찰제완전성검측;근거역치대비도-세절검측능력(대DD)기술,75 kV 시신구IP대체모T0.16진행섭영,청3위관찰자채용쌍맹법대소득영상진행관찰평분,계산역치검측지수HT(A);결합림상용상동폭광조건,불동적IP분별대슬관절、흉부、요추진행투조,청3위방사전가진행쌍맹열편,평개영상질량.결과 신구IP재물리지표상기본상동,재상동폭광조건하,신IP적검측능력고우구IP,당구IP제고20%적복사제량후,구IP검측능력접근신IP.결론 수착IP사용차수적증가,수축보제고폭광제량재능보증영상질량;약보지원유제량불변,IP적검측능력취회하강,장영향질병적진단.
Objective To compare image quality and radiation dose of the new imaging plate (IP) with the used IP on computed radiography (CR),and to investigate the using principle in the two kinds of IP. Methods The dark noise, uniformity and erasure thoroughness of the new and the used IP were measured respectively.Based on threshold contrast-detail detectability(TCCD) technique,the phantom T0.16 photography was done at 75 kV,and with the two kinds of IP respectively.Three observers scored each image sequence using double blind method,calculated the threshold detection index (HT).The volunteers were randomly divided into three groups:the knee joint group,the chest group and the lumbar group.Each group had 50 cases and checked with the same condition as the phantom.Three radiologists using double blind method evaluated the imaging quality of knee joint,chest and lumbar.Results The physical characteristic indexes of the new and the used IP were similar to each other.Under the same condition,the detection ability of the new IP was better than that of the used one.When the dose of exposure was raised about 20%,the detection ability of the used IP was close to that of the new one.Conclusions The dose of exposure can be raised to keep the same imaging quality with the increase times of IP used.The detection ability of IP can decrease with the same dose as before,and the image quality decreases too.