PROBLEM TO BE SOLVED: To provide a medical X-ray imaging system, which includes an X-ray detection part having two kinds of imaging means so constructed as to prevent a removed holder part from hindering a patient or the like after one of the imaging means is removed.SOLUTION: The medical X-ray imaging system includes an X-ray emitting means 2 to emit an X-ray to an object O, the X-ray detection means 1 to detect X-ray transmitted through the object O, and a rotating means 3 to rotate the X-ray emitting means 2 and the X-ray detection means 1 opposedly. The X-ray detection means 1 includes a first sensor part 10, a second sensor part 11, a first holder part 20 to hold the first sensor part 10, a second holder part 21 to hold the second sensor part 11, a detachment/attachment means to detachably attach the first sensor part 10 to the first holder part 20, and a storage means 13 to store the first holder part 20 in the second holder part 21 when the first sensor part 10 is removed from the first holder part 20.COPYRIGHT: (C)2009,JPO&INPIT【課題】2種類の撮像手段を有するX線検出部において、一方の撮像手段を取り外した際でも、取り外されたホルダー部が患者等に邪魔にならないよう構成する。【解決手段】被写体Oに対してX線を照射するX線照射手段2と、被写体Oを透過したX線を検出するX線検出手段1と、X線照射手段2およびX線検出手段1を対向して旋回する旋回手段3とを備え、X線検出手段1が、第1センサー部10および第2センサー部11を備え、第1センサー部10を保持する第1ホルダー部20と、第2センサー部11を保持する第2ホルダー部21と、第1センサー部10を第1ホルダー部20に対して着脱自在にする着脱手段と、第1センサー部10を第1ホルダー部20から取り外した際に、第1ホルダー部20を第2ホルダー部21に格納可能とする格納手段13を備えた。【選択図】図2