A method of imaging a patient, in an apparatus comprising: a patient support on which the patient may be positioned, and a rotatable gantry supporting: a source of imaging radiation for generating a radiation beam towards the patient, and a detector for detecting the radiation beam after interaction with the patient, the detector operating in a continuous cyclical pattern of an exposure phase followed by a readout phase, the method comprising: for a first detector cycle, in which the gantry has a first angle of rotation, controlling the source of radiation to emit a first radiation beam pulse during the exposure phase, and reading out respective first imaging data during the readout phase; for a second, subsequent detector cycle, determining if the gantry has rotated through at least a threshold angular displacement relative to said first angle of rotation, if so, controlling the source of radiation to emit a second radiation beam pulse during the exposure phase, and reading out respective second imaging data during the readout phase. a patient support on which the patient may be positioned, and a rotatable gantry supporting: a source of imaging radiation for generating a radiation beam towards the patient, and a detector for detecting the radiation beam after interaction with the patient, the detector operating in a continuous cyclical pattern of an exposure phase followed by a readout phase, a source of imaging radiation for generating a radiation beam towards the patient, and a detector for detecting the radiation beam after interaction with the patient, the detector operating in a continuous cyclical pattern of an exposure phase followed by a readout phase, the method comprising: for a first detector cycle, in which the gantry has a first angle of rotation, controlling the source of radiation to emit a first radiation beam pulse during the exposure phase, and reading out respective first imaging data during the readout phase; for a second, subsequent detector cycle, determining if the gantry has rotated through at least a threshold angular displacement relative to said first angle of rotation, if so, controlling the source of radiation to emit a second radiation beam pulse during the exposure phase, and reading out respective second imaging data during the readout phase. for a first detector cycle, in which the gantry has a first angle of rotation, controlling the source of radiation to emit a first radiation beam pulse during the exposure phase, and reading out respective first imaging data during the readout phase; controlling the source of radiation to emit a first radiation beam pulse during the exposure phase, and reading out respective first imaging data during the readout phase; for a second, subsequent detector cycle, determining if the gantry has rotated through at least a threshold angular displacement relative to said first angle of rotation, if so, controlling the source of radiation to emit a second radiation beam pulse during the exposure phase, and reading out respective second imaging data during the readout phase. determining if the gantry has rotated through at least a threshold angular displacement relative to said first angle of rotation, if so, controlling the source of radiation to emit a second radiation beam pulse during the exposure phase, and reading out respective second imaging data during the readout phase.