الفهرس 
Radiotherapy Patient WorkflowOnly 14 pages are availabe for public view
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Abstract
Radiotherapy is one of the most important therapeutic modalities
used to treat cancerous tumors. In radiation therapy, a cancer patient is
given a dose of ionizing radiation determined by the radiation oncologist,
and it is given to the patient by directing the radiation beams from outside
the body (External Beam Radiotherapy “EBRT”) to an area previously
determined by the radiation oncologist by drawing the outer bounders of
the treatment volumes (tumors) through computed tomography (CT)
images, which were previously taken to the patient as the first step of
radiotherapy treatment process ”CT-Simulation”. During this scan, a
comfortable position of the patient is selected, which helps in establishing
the treatment plan, taking into account the capabilities of the radiotherapy
treatment machine, the location of the treated area inside the body, and the
healthy tissues surrounding it. The patient’s position during the treatment
must be the same as the patient’s position during simulation process.
The radiation fields are designed to treat the tumor(s) based on the
size and shape of the tumor(s). The success of the radiation treatment
depends on the accuracy of determining the target volumes being treated.
There are many factors influence the accuracy of radiation therapy
delivery. In addition to the experience and skills of the radiation oncologist
to determine the target(s) to be treated, the quality of the acquired different
image modalities which used to create the treatment plans play a role for
the accuracy of determining the target volumes. As the image quality
(resolution and contrast) is good, as the delineation of the target volumes be
more accurate. The geometrical accuracy is one of the most important
factors that affect the quality of radiotherapy. Radiotherapy is performed by
placing the patient on the couch of the radiotherapy machine and moving
the couch to adjust the center of rotation of the treatment device (isocenter).