An imaging method for computer tomographic system includes following steps of: controlling a computer tomographic system to receive an input operation for configuring description data； selecting one of a plurality of imaging parameter sets respectively corresponding to different template data, wherein each imaging parameter set is used to maximize a contrast-to-noise ratio of the 3D imaging data being consistent with the corresponding template data； and, controlling the computer tomographic system to execute a 3D imaging operation according to the selected imaging parameter set for obtaining the 3D imaging data.本發明公開一種電腦斷層系統的造影方法，包括：控制電腦斷層系統接受描述操作以設定描述資料；於分別對應不同的模板資料的多個造影參數集中選擇符合的造影參數集，其中各造影參數集用於最大化符合各模板資料的3D造影資料的對比訊雜比；及，依據所選擇的造影參數集控制電腦斷層系統執行3D造影操作以獲得3D造影資料。本發明經由依據易於理解的描述操作來自動選擇複雜的造影參數集，可有效降低電腦斷層系統的操作難度。
