PROBLEM TO BE SOLVED: To more accurately synchronize the ejection of a contrast agent and the radiography and to inhibit ineffective irradiation by directly observing the contrast agent ejected from an ejection port of a contrast agent ejection part at the distal end of a catheter.SOLUTION: The radiation imaging system is provided comprising the contrast agent ejection part for ejecting the contrast agent into a subject a contrast agent detection part for detecting the contrast agent ejected into the subject from the contrast agent ejection part and an imaging control part for performing the radiation imaging of the subject if the contrast agent detection part detects the contrast agent. With this structure, the dose of radiation exposure of the subject can be reduced by reducing the ineffective irradiation.COPYRIGHT: (C)2009,JPO&INPIT【課題】カテーテル先端の造影剤噴出部の噴出口から噴出する造影剤を直接観測して、造影剤の噴出と放射線撮影とのより高精度な同期を図って、無効な放射線照射の抑制を図る。【解決手段】検体内に造影剤を噴出する造影剤噴出部と、造影剤噴出部から検体内に噴出した造影剤を検出する造影剤検出部と、造影剤検出部が造影剤を検出した場合に検体の放射線撮像を実行させる撮像制御部と、を備える放射線撮像システムを提供する。これにより、無効な放射線照射を少なくして被験者の被爆量を減少する。【選択図】図1
