الفهرس 
AbstractOnly 14 pages are availabe for public view
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Abstract
The thesis is located on 192 pages and contains 210 recent references. The results were recorded in 48 tables and 97 graphs. The thesis is concerned with studying the safety and accuracy of radiation doses administered to cancer patients using modern techniques called intensity-modulated radiotherapy (IMRT). The thesis contains (5) chapters, the first chapter is concerned with the introduction and presentation of previous research and studies that aimed to ascertain the quality of radiotherapy for cancer patients and detect errors that may occur during the delivery of radiation doses, in addition to listing the purpose of the study and exploring other physical aspects that may cause errors. In calculating and distributing radiation doses of modern techniques are used. The second chapter contains an explanation and conclusion of all the theories and equations that were used in the study to evaluate the errors that result from radiation doses. As for the third chapter, all the devices that were used in the study were presented, from a computed tomography (CT) device and a linear accelerator that emits high-energy X-rays with a power of up to 6 million volts and other devices for measuring and calculating radiation doses, as well as displaying the practical methods used In the different measurements, the fourth chapter includes the results that were reached, which presented the intro graphs and tables of the effect of the physical variables of the CT scan device and their impact on the distribution of radiation doses to patients. The results also reviewed the comparisons made between simulation algorithms, radiological measurements of therapeutic doses, and what is calculated by radiotherapy planning devices. The fifth chapter discusses the results and compares them with previous studies. The results showed that there is a clear effect of the physiological factors such as the change of current and the electrical potential difference of the CT scan device on the patient’s diagnostic image data, and the consequent errors in calculating the radiation dose given to patients, which were clearly demonstrated in cancerous diseases that contained high tissue density, such as ( high dense bone). Also, the use of algorithms can verify the radiative distribution. The thesis also concluded that by using the different evaluation methods in the manner addressed, it would detect errors in the distribution of radiation dose and verify the safety of radiotherapy delivered to cancer patients.