X-ray diagnosis apparatus comprising judging circuitry to judge whether a voltage should be applied to a grid of an X-ray tube and grid controlling circuitry

1. An X-ray diagnosis apparatus, comprising:

an X-ray tube configured to radiate X-rays, the X-ray tube including a grid;

judging circuitry configured to judge whether a voltage should be applied to the grid or not, in accordance with a radiation condition; and

grid controlling circuitry configured to, when the judging circuitry has determined that the voltage should be applied, apply the voltage to the grid,

wherein the judging circuitry determines that the voltage should be applied when an X-ray tube voltage and an X-ray tube current serving as the radiation condition are both lower than respective threshold values that are set in advance.

2. An X-ray diagnosis apparatus, comprising:

an X-ray tube configured to radiate X-rays, the X-ray tube including a grid;

an X-ray detector configured to detect the X-rays that have passed through a patient;

setting circuitry configured to set a radiation condition based on detection data of the X-rays detected by the X-ray detector,

judging circuitry configured to judge whether a voltage should be applied to the arid or not, in accordance with the radiation condition set by the setting circuitry, and

grid controlling circuitry configured to, when the judging circuitry has determined that the voltage should be applied, apply the voltage to the grid.

3. The X-ray diagnosis apparatus according to claim 2 , wherein

the setting circuitry is further configured to set the radiation condition for an image taking process performed on the patient, based on the detection data of the X-rays detected by the X-ray detector during a fluoroscopy process performed on the patient, and

the judging circuitry is further configured to judge whether the voltage should be applied to the grid of the X-ray tube or not during the image taking process performed on the patient, in accordance with the radiation condition set by the setting circuitry.

4. The X-ray diagnosis apparatus according to claim 2 , wherein

the setting circuitry is further configured to set the radiation condition for each of pulses of the X-rays radiated in a series of multiple-time radiations, and

when the X-rays are radiated based on the radiation condition every time the radiation condition is set by the setting circuitry, the judging circuitry is configured to judge whether the voltage should be applied or not in accordance with the radiation condition.

5. The X-ray diagnosis apparatus according to claim 4 , further comprising:

controlling circuitry configured to, during a pulse fluoroscopy process, implement a mode in which pulses of X-rays are generated in series for a predetermined time period without applying the voltage, wherein

the setting circuitry is further configured to set the radiation condition for each of the pulses of the X-rays radiated in the series of multiple-time radiations in the mode.

6. The X-ray diagnosis apparatus according to claim 5 , wherein the controlling circuitry is further configured to start the mode when the pulse fluoroscopy process is started.

7. The X-ray diagnosis apparatus according to claim 5 , wherein, during the pulse fluoroscopy process, the controlling circuitry is further configured to start the mode in response to an instruction from an operator.

8. The X-ray diagnosis apparatus according to claim 5 , wherein, when having received a predetermined instruction that is set in advance, the controlling circuitry is further configured to start the mode when the pulse fluoroscopy process is started.