Medical panoramic radiographing device

Claim 1

A medical panoramic radiographing device comprising a panoramic radiographing main body (1), a horizontal rotary arm (21) which is supported by the main body (1) to rotate horizontally, an X-ray source (22) which is held at one end of said arm (21), an X-ray film holder (23) which includes an X-ray film (231) and is held at the other end of said arm (21) in an opposed relation with respect to said X-ray source (22), an X-ray tomography mechanism (2) which irradiates an X-ray beam from the X-ray source (22) to the X-ray film (231) in a substantially perpendicular direction while the movement speed of the X-ray source (22) is synchronous with that of the X-ray film (231) as the rotary arm (21) rotates, and a patient positioning means (3) which is disposed between the X-ray source (22) and the film holder (23), said medical panoramic radiography device being characterized in that said medical panoramic radiographing device further comprises a radiographing mode selection means (4) which is used to select a panoramic radiographing mode or jaw joint radiographing mode otolaryngological region radiographing mode, an X-ray irradiation timing determination means (5) which is used to determine an X-ray irradiation timing appropriate to the rotation position of the rotary arm (21) in the radiographing mode selected by said selection means (4), and an X-ray film movement pattern determination means (6) which is used to determine the movement pattern regarding said movement timing and speed of the X-ray film (231) in said radiographing mode selected by said selection means (4) and wherein: said tomographing mechanism (2) and/or the patient positioning means (3) are movable back and forth by a moving mechanism (7) and said moving mechanism (7) is activated in said radiographing mode selected by said radiographing mode selection means (4); the appropriate movement distance of said moving mechanism (7) to be activated in said radiographing mode selected by said radiographing mode selection means (4) is determined by a back and forth movement distance determining means (8); and said back and forth movement distance determination means (8) compares the detection position data detected by a position detection sensor (81), which detects the relative position of the dental arch of the patient being held by said patient positioning means (3) to the panoramic radiographing main body (1), with the relative position data of the tomographic region drawn by said tomographing mechanism (2) to the panoramic radiographing main body (1), and issues a command signal to said moving mechanism (7).