The Physiology Department at the College of Medicine, University of Baghdad, discussed on Thursday, August 10, 2023, the master's thesis for the student (Isma'il Muhammad Abdullah) titled 'Assessment of the Effect of Computed Tomography on Blood Components for Cancer Patients.' The examining committee was composed under the supervision of Dr. A'idah Zaki Al-Qaisi, chaired by Dr. Najib Hasan Muhammad, and included the membership of Dr. Na'man Salman Daoud and Ms. Mayada Hasan Raheef. The aim of the thesis is to evaluate the impact of X-rays emitted from the CT scanner and laser radiation individually on blood components of cancer patients when exposed to X-rays after being examined using the CT scanner. It also studies the effect of the laser on the blood of cancer patients upon exposure. The study concluded that the impact of X-rays (ionizing radiation) on blood components is minimal, and this effect occurs as a result of injecting the patient with the necessary contrast material for the examination. Furthermore, the study demonstrated a weak effect of the laser on blood components as it is non-ionizing radiation. The researcher compared the impact of ionizing radiation represented by X-rays with the impact of non-ionizing radiation represented by the laser on blood components of cancer patients.