CT nyocha bụ ngwa nchọpụta ọrịa na-arụ ọrụ zuru oke. Ọ bụ usoro onyogho ahụike nke na-eji kọmpụta haziri nke ọtụtụ nyocha X-ray ewepụtara site n'akụkụ dị iche iche iji mepụta onyonyo (cross-section) nke ahụ (virtual 'iberibe') nke ahụ, na-enye onye ọrụ ohere ịhụ n'ime ahụ n'egbughị ya.