Be able to indicate the affected part where the operator supposes on the simulation picture, the x-ray CT scan simulator and the x-ray CT device where the simulation where the precision which also supposition of new affected part occurrence includes is high is possible are offered. The simulated affected part setting device and the description above which set the picture enclosure and the target noise value setting device which sets the noise set point of the desire picture and the condition of the simulated affected part where the operator supposes for housing the standard picture on the basis of the condition of target noise value and the simulated affected part which are set the picture display which indicates the simulation picture formation device which forms the simulation picture which includes the simulated affected part making use of the aforementioned standard picture and the simulation picture which includes the aforementioned simulated affected part and, it has.操作者が想定する病巣をシミュレーション画像上に表示でき、新たな病巣発生の想定も含めた精度の高いシミュレーションが可能なX線CTスキャンシミュレータ、X線CT装置を提供する。 基準画像を格納する画像格納装置と、所望画像のノイズ目標値を設定する目標ノイズ値設定装置と、操作者が想定する模擬病巣の条件を設定する模擬病巣設定装置と、前記設定された目標ノイズ値と模擬病巣の条件に基づき前記基準画像を用いて模擬病巣を含んだシミュレーション画像を生成するシミュレーション画像生成装置と、前記模擬病巣を含んだシミュレーション画像を表示する画像表示装置と、を備える。
