CAJ | 학술논문

目的探索不同CT扫描参数对人体同一种组织CT值的影响.方法通过在同一台CT机上,分别改变其中1个扫描参数,如X线管电压、毫安秒和重建函数等,而保持其他扫描参数不变,多次扫描标准体模,测量和分析体模中不同物质的CT值.结果 X线管电压的改变对物质的CT值影响具有显著意义.聚乙烯、聚碳酸酯、有机玻璃的CT值与管电压成正相关;聚四氟乙烯的CT值与管电压成负相关.毫安秒和重建函数对CT值的影响差异无统计学意义.结论同一个人体组织在不同的X线管电压条件下CT值是变化的.因此,在临床影像诊断和放疗中应该考虑图像扫描参数的设置对诊断和治疗结果的影响.
목적 탐색불동CT소묘삼수대인체동일충조직CT치적영향.방법 통과재동일태CT궤상,분별개변기중1개소묘삼수,여X선관전압、호안초화중건함수등,이보지기타소묘삼수불변,다차소묘표준체모,측량화분석체모중불동물질적CT치.결과 X선관전압적개변대물질적CT치영향구유현저의의.취을희、취탄산지、유궤파리적CT치여관전압성정상관;취사불을희적CT치여관전압성부상관.호안초화중건함수대CT치적영향차이무통계학의의.결론 동일개인체조직재불동적X선관전압조건하CT치시변화적.인차,재림상영상진단화방료중응해고필도상소묘삼수적설치대진단화치료결과적영향.
Objective To study the effects on tissue CT number caused by scan protocols.Methods The phantom was repeatedly scanned in different protocols by changing only one of parameters,such as X-ray tube voltage,mAs and recon kernel,while other parameters were ketp unchanged.The CT number of different materials in phantom were measured and analyzed.Results The CT numbers of tissues changed remarkably with the tube voltage and had different relativity for different tissues.The CT numbers had positive correlation with kV for such maierials as polyethyle,lexan,perspex,but for teflon the correlation was negative.The mAs and recon kernel had no effects on CT number.Conclusions The CT number of tissue changes with scanning X-ray tube voltage,so the setting of scan parameters should be taken into account in image diagnosis and radiotherapy.