CAJ | 학술논문

目的探讨猪食管异物低剂量多排螺旋CT扫描及后处理技术应用的可行性.方法利用猪食管、块状猪肉、鱼刺及鸡碎骨模拟人颈段食管异物模型,在不同扫描条件(管电流50、100、200、400 mA与管电压80、100、120 kV相互组合)进行多排螺旋CT扫描,比较各组的主、客观图像质量、有效辐射剂量和异物检出率.结果不同层厚的各组图像主观评价一致性良好,随图像重建层厚增加异物边缘显示圆滑、模糊,食管周围结构平滑、清晰.重建层厚为2 mm时,相同管电压下,随管电流降低,异物CT值变化不明显,信噪比、对比信噪比变化明显;而相同管电流下,随管电压降低,异物CT值呈升高趋势、信噪比及对比信噪比呈下降趋势;相同管电压条件下,随着管电流的降低,有效辐射剂量相邻组间降低48.8％～50.0％;而相同管电流条件下,随着管电压的降低,有效辐射剂量相邻组间降低37.7％～50.0％;低管电压/管电流组合能更大幅度地降低有效辐射剂量.各组对异物的检出率均为100％.结论联合降低管电压及管电流的低剂量MSCT扫描能用于猪食管异物的诊断.
목적 탐토저식관이물저제량다배라선CT소묘급후처리기술응용적가행성.방법 이용저식관、괴상저육、어자급계쇄골모의인경단식관이물모형,재불동소묘조건(관전류50、100、200、400 mA여관전압80、100、120 kV상호조합)진행다배라선CT소묘,비교각조적주、객관도상질량、유효복사제량화이물검출솔.결과 불동층후적각조도상주관평개일치성량호,수도상중건층후증가이물변연현시원활、모호,식관주위결구평활、청석.중건층후위2 mm시,상동관전압하,수관전류강저,이물CT치변화불명현,신조비、대비신조비변화명현;이상동관전류하,수관전압강저,이물CT치정승고추세、신조비급대비신조비정하강추세;상동관전압조건하,수착관전류적강저,유효복사제량상린조간강저48.8％～50.0％;이상동관전류조건하,수착관전압적강저,유효복사제량상린조간강저37.7％～50.0％;저관전압/관전류조합능경대폭도지강저유효복사제량.각조대이물적검출솔균위100％.결론 연합강저관전압급관전류적저제량MSCT소묘능용우저식관이물적진단.
Objective To assess the feasibility of multi-slice spiralCT (MSCT) with low radiation dose in detecting foreign body in esophagus in pigs.Methods The fish and chicken bones were fixed in one section of pig esophagus, which was inserted in one piece of pork to establish a model of foreign body in esophagus.The pork was scanned using MSCT with different scanning conditions (tube current: 50, 100, 200, 400 mA;tube voltage: 80, 100, 120 kV).The subjective and objective image quality, radiation dose and detection rate of forgeign body were compared among different scanning condition groups.Results The subjective evaluation of image quality had good consistency between two valuators for all the scanning condition groups and different layer thickness.With increase of layer thickness, the border of the forgeign body was gradually evasive and fuzzy, the surround structure of esophagus was gradually smooth and distinct.Under the same voltage, the CT value of forgeign body was not significantly changed, the signal-to-noise ratio (SNR) and contrast-to-noise (CNR) were significantly changed with reduction of the current in 2 mm image;under the same current, the CT value of forgeign body was significantly increased, while the SNR and CNR were significantly decreased along with reduction of the current.Under the same voltage, the effective radiation dose was decreased by 48.8％-50.0％ in one group than that in the adjacent group along with reduction of the current;under the same current, the effective radiation dose was decreased by 37.7％-50.0％ in one group than that in the adjacent group reduction of the voltage.Combination of low tube voltage and low tube current most greatly reduced the effective radiation dose.The detect rate of foreign body were 100％ in all the groups.Condusion MSCT with low tube voltage and low tube currents can effectively diagnose the foreign body in esophagus in pigs.