| CPC G16H 40/60 (2018.01) [G06F 3/016 (2013.01); G06F 3/02 (2013.01); G06F 3/0346 (2013.01)] | 20 Claims |

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1. A method for controlling a radiotherapy device, comprising:
obtaining a first user input;
determining whether the first user input satisfies a trigger condition;
in response to determining that the first user input satisfies the trigger condition, causing handheld device to enter a control state;
obtaining a tilt state of the handheld device; and
controlling, based on the tilt state, a motion state of at least one of a treatment bed and a gantry of the radiotherapy device, the motion state including at least one of a motion direction and a motion speed.
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