Patent ID: 6834994
Filing Date: 2004-12-28
Classification: A61B,G01N

Abstract:
An X-ray imaging apparatus comprising:an X-ray generator configured to irradiate an X-ray to a subject; an X-ray detector configured to detent the X-ray irradiated from said X-ray generator and transmitted through said subject; an arc arm configured to oppositely support said X-ray generator and said X-ray detector; an arm driving unit configured to rotate said arm in a rotation area around said subject, the rotation area including a constant velocity area where said arm is rotated at an approximate constant velocity and an acceleration/deceleration area near at least one of a start position and a stopping position of rotation of said arm; a timing control unit configured to control the X-ray generator to irradiate the X-ray at a first interval in the constant velocity area and irradiate the X-ray at a second interval that is different from the first interval in the acceleration/deceleration area; and an image memory unit configured to store a first mask image corresponding to the X-ray irradiated at the first interval and a second mask image corresponding to the X-ray irradiated at the second interval before injecting a contrast medium into said subject, and store a first contrast image corresponding to the X-ray irradiated at the first interval and a second contrast image corresponding to the X-ray irradiated at the second interval after injecting said contrast medium, and a subtraction unit configured to perform subtraction processing on the first mask image and the first contrast image and perform subtraction processing on the second mask image and the second contrast image.