Cov hlua hlau yog ib qho khoom siv kho qhov muag electromechanical ntsia rau pem hauv ntej ntawm lub qhov rais tso zis ntawm X-ray tube los ua ke lub tes tsho.Nws lub luag haujlwm tseem ceeb yog los tswj cov irradiation teb ntawm X-ray raj tso zis kab, thiaj li txo qis X-ray duab thiab kuaj mob.Qhov projection ntau tuaj yeem zam qhov tsis tsim nyog koob tshuaj, thiab tuaj yeem nqus tau qee cov kab hluav taws xob tawg los txhim kho qhov cuam tshuam ntawm qhov pom tseeb.Tsis tas li ntawd, nws tseem tuaj yeem qhia qhov projection center thiab qhov loj ntawm qhov projection field.Hlau harness yog ib qho khoom siv tseem ceeb uas tsis muaj kev cuam tshuam rau X-ray projection thiab kev tiv thaiv.