One of the most important issues in the field of radiotherapy is the correct distribution of the dose around the volume of interest or planning target volume (PTV). For making this possible the exact isodose in a treatment plan has to cover the PTV, so it is used the wedge which is a part of the linear accelerator head. Wedge plays the role of a filter and usually it is called wedge filter. The wedge filter is in use almost in all treatment plans, for all the parts of the body. In this paper it is consider the use of the wedge filter for treatment of rectum tumors.
The process starts with the scanning of the patient and the deliantion of the interest’s volums in the Monaco system. In the following the imagins have been sent in the treatment planning system for making the nesessary plans for treatment of the rectum. Two plans were done, one with the use of the wedge and the other without using it. The dose volume histogram helps for compering the results of the plans. The best conformity of the isodoses it was for the plan with the use of wedge through volume of interest, which is planning target volume (PTV).
Ellis F, and Miller H. The use of wedge filters in deep x-ray therapy. British Journal of Radiology 17:904 (1944).
NIH consensus conference Adjuvant therapy for patients with colon and rectal cancer. JAMA. 1990;264:1444–50. [PubMed]
Swedish Rectal Cancer Trial. Cedermark B, Dahlberg M, et al. Improved survival with preoperative radiotherapy in resectable rectal cancer. N Engl J Med. 1997;336:980–7. [PubMed]
P. Cherry, A. Duxbury (1998). Practical radiotherapy physics and equipment, 139. Cambridge University Press.
Stephens RJ, Thompson LC, Quirke P, et al. Impact of short-course preoperative radiotherapy for rectal cancer on patients' quality of life: data from the Medical Research.
W. Parker, H. Patrocinio (2005). Clinical treatment planning in external photon beam radiotherapy. In: Radiation Oncology Physics: a handbook for teachers and students (E. B. Podgorsak. (Ed)), 219. International Atomic Energy Agency, Vienna.
This work is licensed under a Creative Commons Attribution 4.0 International License.