CAJ | 학술논문

目的研究婴儿头颅CT检查中使用铋屏蔽材料降低眼晶状体受照剂量的效果及对图像质量的影响.方法使用适合患儿使用的自制铋屏蔽防护眼罩、婴儿体模,采用热释光探测器测量受照剂量.CT扫描条件选择120 kV、130 mA轴位扫描,分别进行铋屏蔽和无屏蔽两组模体测试,比较模体内相当于晶状体位置的受照剂量;应用同样CT扫描参数,对临床疑为颅内出血的99例患儿佩戴铋屏蔽眼罩后进行头部扫描,由2名高年资医生分别进行图像质量评估,并比较评分的一致性.结果体模实验显示,无屏蔽时眼罩后方区域吸收剂量为25 mGy,经铋防护眼罩屏蔽后眼罩后方的吸收剂量为17 mGy,降低辐射剂量32％.佩戴铋屏蔽眼罩对患儿头部CT图像质量无明显影响.结论在婴儿头颅CT扫描中使用铋屏蔽防护眼罩,可明显降低眼晶状体放射吸收剂量,同时对CT图像质量的影响是可接受的.
목적 연구영인두로CT검사중사용필병폐재료강저안정상체수조제량적효과급대도상질량적영향.방법 사용괄합환인사용적자제필병폐방호안조、영인체모,채용열석광탐측기측량수조제량.CT소묘조건선택120 kV、130 mA축위소묘,분별진행필병폐화무병폐량조모체측시,비교모체내상당우정상체위치적수조제량;응용동양CT소묘삼수,대림상의위로내출혈적99례환인패대필병폐안조후진행두부소묘,유2명고년자의생분별진행도상질량평고,병비교평분적일치성.결과 체모실험현시,무병폐시안조후방구역흡수제량위25 mGy,경필방호안조병폐후안조후방적흡수제량위17 mGy,강저복사제량32％.패대필병폐안조대환인두부CT도상질량무명현영향.결론 재영인두로CT소묘중사용필병폐방호안조,가명현강저안정상체방사흡수제량,동시대CT도상질량적영향시가접수적.
Objective To explore the benefit from eye-lens dose reduction and the impact on the clinical imaging quality using orbital bismuth shield in infant head CT.Methods According to the width and length of the patients' eyes,the eye-shield was modified for infant sizes.An infant head CTDI phantom was scanned twice with and without eye-lens bismuth shielding.The infant CT head protocols were 120 kV,130 mA with axial sequential scanning.The thermoluminescence detectors (TLD) were used to detect the organ dose of eye lens.Ninety-nine infant cases clinically suspected intracranial hemorrhage were scanned with the same CT scanning protocol.Two senior radiologists scored the image quality and evaluated the consistency of scores.Results The radiation dose for eye-lens was reduced by 32％ on phantom test.The rate of accepted imaging was 92％ and κappa value between two radiologists was 0.78.Conclusions The eye-shield could reduce doses to eve-lens significantly in infant head CT scanning with acceptable image quality.