X-ray imaging apparatus using X-ray planar detector

An X-ray imaging apparatus comprising:

• X-ray emission means for emitting X-rays onto a human body under examination;
• X-ray emission control means for outputting an X-ray emission signal which directs said X-ray emission means to emit said X-rays;
• a flat panel X-ray detector having a two-dimensional array of detector elements in lines and columns, each of said detector elements converts incident X-rays passed through said human body under examination into an electric signal and stores the electrical signal;
• readout means for reading out said electric signals from said detector elements in sequence and generating a frame signal representative of a frame;
• and
• X-ray image producing means for producing an X-ray image by adding frame signals the first of which represents the frame obtained at the start of the emission of X rays and the last of which represents the frame after the frame obtained at the termination of the emission of X rays.

An X-ray imaging apparatus comprising:

• X-ray emission means for emitting X-rays onto a human body under examination;
• X-ray emission control means for outputting an X-ray emission signal which directs said X-ray emission means to emit said X-rays;
• a flat panel X-ray detector having a two-dimensional array of detector elements in lines and columns, each of said detector elements converts incident X-rays passed through said human body under examination into an electric signal and stores the electric signal;
• readout means for reading in a sequence from said detector elements of all electric signals other than those representing frames after the frame obtained at the start of the emission of X-rays and before the frame obtained at the termination of the emission of X-rays;
• X-ray image producing means for adding a frame signal representing the frame obtained at the start of the emission of X-rays and frame signals representing the frames obtained after the termination of the emission of X-rays and for producing an X-ray image by summing electric signals read by said readout means during the frame at the start of the emission of X-rays and during the frame following the frame at the termination of the emission of X-rays;
• and
• readout stopping means for stopping said readout means from reading electric signals from each of said detector elements during successive frames from the frame following a frame at the start of the emission of X-rays to a frame at the termination of X-rays.

An X-ray imaging apparatus comprising:

• X-ray emission means for emitting X-rays onto a human body under examination;
• X-ray emission control means for outputting an X-ray emission signal which directs said X-ray emission means to emit said X-rays;
• a flat panel X-ray detector having a two-dimensional array of detector elements in lines and columns, each of said detector elements converts incident X-rays passed through said human body under examination into an electric signal and stores the electric signal;
• readout means for reading out electric signals from said detector elements in sequence and generating a frame signal representing a frame;
• mode-selecting means for selecting a first mode or a second mode;
• and
• X-ray image producing means for producing an X-ray image by adding frame signals;
• wherein when the first mode is selected, said readout means reads out electric signals from said detector elements in sequence and generates a frame signal representing a frame, and said X-ray image producing means adds frame signals the first of which represents the frame obtained at the start of the emission of X-rays and the last of which represents the frame next to the frame obtained at the termination of the emission of X-rays;
• and
• wherein when the second mode is selected, said readout means reads in sequence from said detector elements all electric signals other than those representing frames after the frame obtained at the start of the emission of X-rays and before the frame obtained at the termination of the emission of X-rays, and said X-ray image producing means adds a frame signal representing the frame obtained at the start of the emission of X-rays and frame signals representing the frames obtained after the termination of the emission of X-rays.