Kabushiki Kaisha Toshiba

Tokyo Shibaura Denki Kabushiki Kaisha

Mitsuyoshi Matsubara

Yukinobu Ito

Masataka Arita

In a radiation image recording system for recording a processed image on a recording medium by frequency emphasis processing and gradation processing of radiation image data from an object to be examined, an image processing apparatus performs frequency emphasis processing and gradation processing of the radiation image data for a later image recording stage. The image processing apparatus calculates two unsharp mask data Sus1 and Sus2 for two different mask sizes, and substantially simultaneously forms two processed image data by frequency emphasis processing and gradation processing of the radiation image data using the unsharp mask data Sus1 and Sus2.

Image processing apparatus

A falling load type X-ray diagnostic apparatus comprises a low voltage power source, AC-DC converting means connected to the low voltage power source so as to apply a rectified low DC voltage, chopping means connected to the AC-DC converting means and chopping said DC voltage into a low AC voltage, high voltage applying means for transforming said low AC voltage into a high AC voltage, said high AC voltage being applied as a tube voltage to an X-ray tube from which X-rays are irradiated toward an object to be examined, means for controlling a filament heating power of the X-ray tube, programming means for supplying a control signal to said filament heating control means so as to reduce the emission current of said X-ray tube during the irradiation, and chopper control means for controlling the chopping ratio of said chopping means by evaluating said rectified DC voltage with a preset tube voltage generated in said programming means, said programming means compensating said tube voltage by receiving said control signal in such a manner that said tube voltage is maintained substantially constant during the irradiation by varying said preset tube voltage so as to control the chopping ratio based upon the reduction of the filament heating power for the X-ray tube.

Growing community of inventors

Tochigi, Japan

Mitsuyoshi Matsubara