Variation in the number of sequences, dose-length product (DLP) and volume weighted Computed Tomographic dose index (CTDIvol) recorded for selected CT scanning examinations performed in a Western Australian tertiary hospital over a three month period in 2011.

1Where applicable values are generated using summed value for cases where multiple sequences were recorded.1. 若适用，针对已记录多条序列的场景，相关数值通过对各序列的数值求和生成。