1. A method of verifying a patient identity, comprising the steps of: providing a reference image of a patient to whom a radiotherapy is intended; obtaining an image of an individual who is to receive the radiotherapy; comparing the obtained image of the individual with the reference image of the patient; confirming or negating the individual to be the patient intended based on the comparison of the obtained image of the individual with the reference image of the patient; and generating an output signal confirming or negating the verification, and/or warning signal if patient's variance exceeds a threshold, wherein the image of the individual is acquired in a treatment room in which the radiotherapy is to be provided; and the image of the individual is obtained using X-ray radiography, computed tomography (CT) imaging, magnetic resonance imaging (MRI), positron emission tomography (PET) imaging, single photon emission computed tomography (SPECT) imaging, or ultrasound (US) imaging.