الفهرس 
TitleOnly 14 pages are availabe for public view
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Abstract
The goal of radiation therapy is to administer a therapeutic dose of radiation to a target while limiting the side effects caused by delivering the dose to surrounding tissues and vital organs
IGRT refers to usage of different imaging techniques in order to correct possible setup errors in positioning of the patient thus improving precision and accuracy for delivering of radiation treatment.
CBCT-based x-ray technology enables the visualization of internal anatomy with its ability for penetration. The increased frequency of imaging by CBCT, increases the quantity of radiation dose delivered to patients with increasing the possibility for secondary cancers.
Catalyst scanning system based on optical visible light without any additional radiation exposure for patient positioning with visual user assistance in identification of positioning accurately with interfractional movements control and automated respiratory gating.
In the present study, 252 sessions were imaged using Catalyst and CBCT to determine the position of the patient to assess the interchangeability of the two methods while receiving radiotherapy sessions.
Our result showed that:
In lateral degree, there is a non-significant difference between the Catalyst and the CBCT (P=0.175).
In Longitudinal degree, there is a non-significant difference between the Catalyst and the CBCT (P= 0.296).
In vertical degree, there is a non-significant difference between the Catalyst and the CBCT (P= 0.110).
Summary, Conclusion &Recommendation
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In Rotation degree, there is a non-significant difference between the Catalyst and the CBCT (P= 0.936).
In Roll degree, there is a non-significant difference between the Catalyst and the CBCT (P= 0.527)
In Pitch degree, there is a non-significant difference between the Catalyst and the CBCT (P= 0.270).
Conclusion
from this study, it could be concluded that:
There is a non-significant difference between CBCT and Catalyst in all six degrees of deviation in patient positioning (Lateral, Longitudinal, Vertical, Rotation, Roll and Pitch).
Optical light scanner system Catalyst is compatible with Cone beam computed tomography CBCT, so Catalyst is reliable and feasible Image-guided radiation therapy for daily patient positioning without any need for daily additional radiation exposure.
Recommendations
Based on this study, it could be recommended that:
Using optical light scanner system Catalyst for daily patient positioning instead of Cone beam computed tomography CBCT.
Upgrading the Catalyst system from one to three camera scanners with open masks in head and neck cancer patients are good choices to enhance the patient positioning and the comfort of the patient.
The use of Cone beam computed tomography CBCT periodically to confirm the effectiveness of the optical light scanner system Catalyst in patient positioning.