Radiation imaging apparatus and method for controlling radiation imaging apparatus

A radiation imaging apparatus comprising:

• a radiation source configured to irradiate a subject with radiation;
• a two-dimensional detection device configured to detect the radiation having passed through the subject;
• and
• a grid portion configured to eliminate scattered rays of the radiation, which is mounted on an image-receiving surface of the two-dimensional detection device,
• wherein the radiation source is arranged via a first sub-arm that is rotatably connected to a frame of an arm at the inside from one end portion of the frame,
• a radiation source shift unit, which is provided between the radiation source and the first sub-arm, configured to move the radiation source to the first sub-arm,
• wherein the radiation source shift unit moves the radiation source in the direction orthogonal to a stripe direction of a grid portion of the two-dimensional detection device to allow the radiation source to align with the imaging axis passing through the center of the two-dimensional detection device changed by the movement of the second sub-arm.

A radiation imaging comprising:

• a radiation source configured to irradiate a subject with radiation;
• a two-dimensional detection device configured to detect the radiation having passed through the subject;
• and
• a grid portion configured to eliminate scattered rays of the radiation, which is mounted on an image-receiving surface of the two-dimensional detection device,
• wherein the radiation source is arranged via a first sub-arm that is rotatably connected to a frame of an arm at the inside from one end portion of the frame,
• wherein the frame of the arm is a semicircular frame having a central point located along an imaging axis,
• wherein, when an angle α from a crossing portion of the imaging axis, which links the two-dimensional detection device and the radiation source, and the arm to the connection portion between the first sub-arm and the arm or to the connection portion between the second sub-arm and the arm at the central point of the semicircular frame of the arm is defined as α, the inequality of α1=<α=<α2 is established, and
• when a lower limit of an imaging distance due to the grid portion, which is provided on the image-receiving surface of the two-dimensional detection device to eliminate the scattered rays of the radiation, is defined as f1, the radius of the semicircular frame of the arm is defined as R, the distance from the connection portion between the sub-arm and the arm to the connection portion between the sub-arm and the two-dimensional detection device or the radiation source is defined as L1, L1 is defined as a smallest value satisfying the following equations (1) and (2) below, and the distance from the connection portion between the sub-arm and the arm to the crossing portion is defined as L2, the equations of:
• L1=L2 (1)
• 2R=f1+L1×cos(α1) (2)
• f1=R×(1+cos(α2)) (3)
• are satisfied.

A control method in a radiation imaging apparatus that includes:

• a radiation source configured to irradiate a subject with radiation;
• a two-dimensional detection device configured to detect the radiation having passed through the subject;
• a grid portion configured to eliminate scattered rays of the radiation, which is mounted on an image-receiving surface of the two-dimensional detection device,
• wherein the radiation source and the two-dimensional detection device are arranged to face each other across a C-arm, wherein the radiation source is arranged via a first sub-arm that is rotatably connected to the frame of the arm at the inside from one end portion of the frame, and the two-dimensional detection device is arranged via a second sub-arm that is rotatably connected to the frame of the arm at the inside from the other end portion of the frame,
• a radiation source shift unit, which is provided between the radiation source and the first sub-arm, configured to move the radiation source to the first sub-arm, and
• a detection device shift unit, which is provided between the two-dimensional detection device and the second sub-arm, configured to move the two-dimensional detection device to the second sub-arm,
• the method comprising:
• shifting the radiation source by the radiation source shift unit, according to rotation of the first sub-arm, to move the radiation source in the direction orthogonal to a stripe direction of the grid portion to allow the radiation source to align with an imaging axis linking the radiation source and the two-dimensional detection device, or
• shifting the two-dimensional detection device by the detection device shift unit, according to rotation of the second sub-arm, to move the two-dimensional detection device in the direction orthogonal to a stripe direction of the grid portion to allow the two-dimensional detection device to align with an imaging axis linking the two-dimensional detection and the radiation source.

A non-transitory computer-readable storage medium storing a program that controls a radiation imaging apparatus that includes:

• a radiation source configured to irradiate a subject with radiation;
• a two-dimensional detection device configured to detect the radiation having passed through the subject;
• a grid portion configured to eliminate scattered rays of the radiation, which is mounted on an image-receiving surface of the two-dimensional detection device, wherein the radiation source and the two-dimensional detection device are arranged to face each other across a C-arm, wherein the radiation source is arranged via a first sub-arm that is rotatably connected to the frame of the C-arm at the inside from one end portion of the frame, and the two-dimensional detection device is arranged via a second sub-arm that is rotatably connected to the frame of the C-arm at the inside from the other end portion of the frame,
• a radiation source shift unit, which is provided between the radiation source and the first sub-arm, configured to move the radiation source to the first sub-arm, and
• a detection device shift unit, which is provided between the two-dimensional detection device and the second sub-arm, configured to move the two-dimensional detection device to the second sub-arm,
• the program comprising:
• computer-executable instructions for shifting the radiation source by the radiation source shift unit, according to rotation of the first sub-arm, to move the radiation source to align with an imaging axis linking the radiation source and the two-dimensional detection device, or
• computer-executable instructions for shifting the two-dimensional detection device by the detection device shift unit, according to rotation of the second sub-arm, to move the two-dimensional detection device in the direction orthogonal to a stripe direction of the grid portion to allow the two-dimensional detection device to align with an imaging axis linking the two-dimensional detection device and the radiation source.