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CT扫描

ID: ANH12068chis
医学动画文字记录:CT扫描,也称为CAT扫描或计算机轴向断层扫描,是一种无痛诊断检查,通过x射线和计算机生成人体骨骼和组织的横切面图像。如果怀疑有以下情况时,医生可能会建议你做CT扫描:血栓、骨折、恶性肿瘤、感染、内伤和出血,以及出现心脏和血管疾病的体征。CT扫描可以辅助医生确定手术、活组织检查或放射治疗的正确位置,检查癌症或心脏病的治疗效果,以及检查手术后的情况。CT扫描仪是一个大的方形或圆形x线机,中心有一个通道。在CT扫描过程中,你躺在可以缓慢穿过通道的扫描床上。当你穿过通道时,一个称为机架的大环会绕着你的身体旋转。机架包括释放x射线的x线球管,以及检测人体吸收辐射量的探测器。当机架旋转时,x射线光束将从不同角度捕捉身体的大量视图。探测器把数据发送到计算机上,计算机生成人体骨骼和软组织的横截面图像。扫描可以让医生看到体内的情况,辅助医生确定治疗方案或了解治疗进展。在某些情况下,检查前可能需要口服、注射对比剂或进行钡灌肠,使医生更易于看到身体的某些部位。如果口服对比剂,食管或胃会被突出显示。如果注射对比剂,血管、胆囊、肝脏或尿道会被突出显示。如果进行钡灌肠,大肠会被突出显示。检查结束后,你就可以恢复正常活动了。如果使用了对比剂,大量饮水有助于肾脏清除对比剂。
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