Computed tomography, also known as CT scan, is a significant advancement over conventional radiology. The term “computed” stands for calculation and “tomography” stands for sectioning a part of the anatomy, using X-rays, and displaying the image of that section (Jung, Prog Med Phys 32:117, 2021). The CT scan consists of a gantry with a wide bore, which houses an X-ray tube. The tube faces the couch on which the patient lies. Behind this couch and within the CT gantry (housing), are an array of photoelectric detectors which are on the opposite side of the X-ray tube, facing it. A finely collimated X-ray beam passes through the part of the body being examined. This X-ray beam is attenuated to varying degrees by the structures in the body part,it traverses through on its way to the photoelectric detectors. The photoelectric detectors light up to different degrees, producing light energy which is converted into electrical energy. This electrical energy carries data of the structure traversed by the X-ray beam. The data which is in the form of attenuation differences between various tissues encountered in the scanned field (and measured in Hounsfield units—HU), is converted into an image through a complicated process using mathematical principles.