Radiation Therapy: CT Scan Simulation |
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In some situations, a special computerized tomographic (CT) scanner will be used along with simulation to help plan some radiation therapy treatments. In these instances, the CT scanning process will be performed in the Radiation Oncology Department several days prior to the simulation. Information from the CT scan is used to precisely locate the treatment fields. The CT scanner is specially designed to work with the other equipment in the Department, and is not a replacement for other diagnostic scans you may have received.
At the end of the simulation visit, it is necessary to put marks on you to outline the treatment field(s). These marks are in the form of very small tattoos, which are dots the size of a pinpoint or freckle, made using India ink. The process of tattooing causes some temporary discomfort. Generally, between 4 and 8 tattoo marks are placed, but sometimes more or less are necessary. In some treatment plans, a second set of tattoos may be necessary. While the tattoos are permanent, because of their very small size, they are not very noticeable. By using the tattoos, it will be possible for you to bathe or shower on a daily basis without worrying about removing these important marks that show where the radiation treatments are to be delivered. Also, if any additional radiation therapy is needed in the future, the tattoos serve as a permanent record of previous treatments. In very rare instances, tattoos will not be used.
The actual administration of the radiation treatment usually takes only about 5 to 10 minutes. Factors that affect the total length of the treatment include the complexity of your treatment, the particular machine on which you are being treated and how quickly you can be positioned properly for treatment. On average, most patients spend a total of 20 to 30 minutes in the Department per day receiving their treatment.
