1. A method of controlling a position of a radiation treatment system, comprising: capturing, by a processor, a first image of a patient on a first axis and a second axis using a first camera and capturing a second image of the patient on the second axis and a third axis using a second camera; acquiring, by the processor, a third image of the patient captured using the first camera and a fourth image of the patient captured using the second camera during previous radiation treatment; calculating, by the processor, a first position change of the patient on the first axis and the second axis using the first image and the third image and calculating a second position change of the patient on the second axis and the third axis using the second image and the fourth image; calculating, by the processor, a third position change of the patient along the third axis using a difference between a first number of reference pixels and a second number of reference pixels, wherein the first number of reference pixels is defined as a number of pixels between first reference points in the first image and the second number of reference pixels is defined as a number of pixels between the first reference points in the third image; verifying by the processor, the second position change of the patient on the third axis using the third position change; and controlling, by the processor, a position of the patient using the first position change and the second position change so that the position of the patient is identical to a position of the patient during previous radiation treatment.