Radiation treatment apparatus

1. A radiation treatment apparatus comprising:

an accelerator that emits a charged particle beam;

a time measurement unit that measures an emission time of the charged particle beam of the accelerator;

a first control unit that controls the accelerator based on the emission time measured by the time measurement unit; and

an emission determination unit that determines whether or not the accelerator is emitting the charged particle beam while the first control unit is controlling the accelerator,

wherein the time measurement unit adds a time, for which a result of a determination performed by the emission determination unit is that the accelerator is emitting the charged particle beam, to the emission time of the charged particle beam of the accelerator and does not add a time, for which the result of the determination performed by the emission determination unit is that the accelerator is not emitting the charged particle beam, to the emission time of the charged particle beam of the accelerator.

2. The radiation treatment apparatus according to claim 1 ,

wherein the emission determination unit determines whether or not the charged particle beam is being emitted based on information indicating a state of generation of the charged particle beam in the accelerator.

3. The radiation treatment apparatus according to claim 2 ,

wherein the accelerator includes a generation source that generates a charged particle, and

wherein the emission determination unit determines whether or not the accelerator is emitting the charged particle beam based on information indicating a state of generation of the charged particle at the generation source.

4. The radiation treatment apparatus according to claim 2 ,

wherein the accelerator includes a stopper that is provided on a trajectory of the charged particle beam and controls passage and blockage of the charged particle beam by being opened and closed, and

wherein the emission determination unit determines whether or not the accelerator is emitting the charged particle beam based on information indicating an opening and closing state of the stopper.

5. The radiation treatment apparatus according to claim 2 ,

wherein the accelerator includes a signal source that outputs high-frequency electric power, and

wherein the emission determination unit determines whether or not the accelerator is emitting the charged particle beam based on information indicating a state of the high-frequency electric power.

6. The radiation treatment apparatus according to claim 1 , further comprising:

a plurality of charged particle beam measurement units that are provided in a beam path of the charged particle beam and measure a state of the charged particle beam; and

a plurality of second control units that control the accelerator based on a result of measurement performed by the plurality of charged particle beam measurement units,

wherein the first control unit and the plurality of second control units control the accelerator independently of each other.

7. The radiation treatment apparatus according to claim 1 ,

wherein the accelerator includes an interlock that regulates emission of the charged particle beam, and

wherein the time measurement unit continues measurement of the emission time in a case where the interlock does not regulate the emission of the charged particle beam and ends the measurement of the emission time in a case where the interlock regulates the emission of the charged particle beam.