Jessen K A, Shrimpton P C, Geleijns J, Panzer W, Tosi G
Department of Medical Physics, Aarhus University Hospital, Denmark.
Appl Radiat Isot. 1999 Jan;50(1):165-72. doi: 10.1016/s0969-8043(98)00024-4.
The complex conditions of irradiation in computed tomography (CT), involving highly-collimated X-ray beams, necessitate the use of specially-defined dose descriptors such as the computed tomography dose index (CTDI). When used in a weighted form (CTDIW), this concept can describe the absorbed dose from a single slice in standard head and body phantoms. The model can easily be extended to characterise patient exposure for a complete examination by means of the reference dose quantity dose-length product (DLP). Effective dose can also be estimated from DLP, when required.
计算机断层扫描（CT）中的复杂照射条件，包括高度准直的X射线束，使得必须使用专门定义的剂量描述符，如计算机断层扫描剂量指数（CTDI）。当以加权形式（CTDIW）使用时，这个概念可以描述标准头部和体模中单个切片的吸收剂量。通过参考剂量量剂量长度乘积（DLP），该模型可以很容易地扩展以表征完整检查时的患者照射情况。如有需要，也可以从DLP估计有效剂量。
