Precision Targeting Lowers Risk While Directing Higher Dose Of Radiation At Tumors
2/13/2007 United Kingdom press release Medical News Today (ww.medicalnewstoday.com) A new radiation treatment system at Rush University Medical Center addresses two important aspects of cancer treatment simultaneously with one device: confirming the exact location of a tumor during each treatment session and then delivering treatment. This approach is known as image guide radiation therapy (IGRT). The TomoTherapy Hi-Art System combines 3-D imaging from computerized tomography (CT scanning) with precisely targeted radiation beams. Because of the remarkable accuracy of the system it is possible to direct a higher dose of radiation at a tumor with a lower risk of affecting surrounding tissues and organs. Precise patient positioning is crucial for effective radiation treatment. With the TomoTherapy system, CT scan slices are taken through the area being treated as the patient lies on the treatment table. These slices are used to image the location of the tumor and to make immediate adjustments, if needed, to make sure the radiation is directed exactly to where it should be. "This is extremely useful since a patient's tumor position may change slightly from session to session," said Dr. Ross Abrams, chairman, department of Radiation Oncology at Rush. Immediately after determining the correct position, the TomoTherapy system delivers a very sophisticated form of intensity modulated radiation therapy (IMRT). As the patient slowly moves continuously through a rotating ring, the radiation beam makes a spiral pattern around the patient. Each time the linear accelerator, the mechanism that creates the radiation beam, comes around it is directing the [...]