Commissioning of Total Skin Electron Therapy (TSET) Technique

摘要：

　　Total skin electron therapy (TSET) is a special radiotherapeutic technique used to treat a variety of cutaneous malignancies where most or all of the skin is involved.The aim of the treatment is to irradiate the whole skin to a uniform dose profile within±10%,both circumferentially around the patient as well as along the patients length,while sparing the underlying organs.At King Fahd Specialist Hospital - Dam- mam,two irradiation techniques using a 6 MeV high dose rate (888 MU/min) electron beam from a Clinac 2300CD (Varian Medical Systems.Inc.,Palo Alto,Ca,USA) are being investi- gated.For both techniques,the patient stands on a stationary platform 30 cm above the ground at a Source-to-Skin distance of 400 cm and is irradiated in six different positions to cover all parts of the body.Production of a flat beam profile in the first technique is based on a dual field irradiation with fields aiming above and below the mid-horizontal level.In the second technique,a flat beam is obtained using a custom made flatten- ing filter with a single large field.We are in the process of designing and testing a filter for the production of flat beam profile.Percentage depth dose curves at 100 cm and at 400 cm were measured using a Markus parallel plate ionization cham- ber and beam profiles were measured using 20 MOSFET dosimeters.We have measured the beam output for the single stationary dual beams and the unfiltered single field beam.We have also measured an effective output correction factor that relates the output at a point from all 6 irradiation posi- tions to that from a single irradiation position.

关键词： Total skin electron therapy beam profile per- cent depth dose flattening filter source-to-skin distance

作者: M.S.Z.ulHassan I.AIDahlawi N.Maalej W.Abdel-Rahman

作者单位: Department of Physics, King Fahd University of Petroleum and Minerals, Dhahran, Saudi Arabia Department of Radiation Oncology, King Fahd Specialist Hospital, Dammam, Saudi Arabia

会议类型: 国际会议

会议名称: World Congress on Medical Physics and Biomedical Engineering (2012年医学物理及生物医学工程国际会议(IFMBE))

会议地点: 北京

会议语种:英文

页码: 1899-1902

在线出版日期: 2012-05-26（万方平台首次上网日期，不代表论文的发表时间）