在临床上,虽然 CT 检查只占 X 线检查的5%,但却占医疗 X 线检查总辐射量的1/3～2/3,其中诊断性 X 线检查尤甚,并在不断上升,尤其是多期螺旋 CT 扫描技术的应用(动脉期、静脉期、延迟期),病人的受辐射量成倍增加,损害健康、诱发癌症的几率也明显增高。特别是儿童对 X 线较成人敏感,更易受害。近年英国学者估计,美国约有500名15岁以下儿童有可能首接由 CT 扫描引发癌症,以上数字令人担忧。 Clinically, although the CT examination only accounts for 5% of the X-ray examination, it accounts for 1/3 to 2/3 of the total radiation dose of medical X-ray examination. Diagnostic X-ray examination is even worse, and it is increasing. It is the application of multi-phase spiral CT scanning technology (arterial phase, venous phase, and delay phase). The radiation dose of the patient is exponentially increased, and the risk of damaging health and inducing cancer is also significantly higher. Especially children are more sensitive to X-ray than adults. In recent years, British scholars have estimated that the number of children under the age of 15 in the United States may be the first to cause cancer by CT scans. The above figures are worrying.