Development of a Rotating X-ray Shutter for Coronary Angiography Using Synchrotron Radiation

Abstract

The first clinical examination using a two-dimensional imaging system of coronary angiography with monochromated synchrotron radiation was carried out at the National Laboratory for High Energy Physics in May 1996. A rotating X-ray shutter was developed to produce a pulsed X-ray beam with 2-6 ms of beam spill to suppress image blurring, at a frequency of 30 Hz. A performance test of the X-ray shutter using synchrotron radiation was carried out, and it was verified that the shutter had satisfactory specifications for clinical applications. With this X-ray shutter the monitored radiation dose in clinical examinations was consistent with theoretical expectations and kept within a reasonable level of radiation protection.

Development of a compact x-ray particle image velocimetry for measuring opaque flows

“…[16][17][18][19] Among them, the rotating-disk-type chopper 20,21 and the solenoid-driven-type shutter can be candidates in the compact x-ray PIV system. For a rotating-disktype chopper, the disk configuration is almost fixed and the transmission frequency is controlled by adjusting the rotation speed of the disk.…”

Development of a two-dimensional imaging system for clinical applications of intravenous coronary angiography using intense synchrotron radiation produced by a multipole wiggler

“…For the purpose of reducing the X-ray exposure dose to patients as much as possible, a high-speed X-ray shutter and a high-speeddriven aluminium ®lter were placed before the crystal. The highspeed X-ray shutter chosen is of the stainless-steel rotating-drum type, having an aperture for the transmission of the radiation beam; three kinds of apertures corresponding to 2, 4, 6 ms were prepared (Oku et al, 1998). By employing this type of high-speed X-ray shutter, the generation of pulse-like radiation at a rate of 30 s À1 or 15 s À1 is feasible.…”