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TY - CONF AU - Yakovlev, I.A. AU - Akulinichev, S.V. AU - Gavrilov, Y.K. AU - Ilich, R.D. ED - Kuzin, Maxim ED - Schaa, Volker RW TI - The Way To Improve Conformity Of Proton Therapy J2 - Proc. of RuPAC2016, St. Petersburg, Russia, November 21-25, 2016 C1 - St. Petersburg, Russia T2 - Russian Particle Accelerator Conference T3 - 25 LA - english AB - In the case of small tumors the pencil beam width may be comparable with the target size. In these cases the application of classic method of passive beam scattering with a one-stage formation of dose distribution may be reasonable. However, the last method in its standard implementation fails to provide the dose conformity: either the maximal dose exceeds the tumor volume on its proximate site or the dose deviates too much within the tumor. In order to overcome this shortcoming of the passive scattering method, we suggest a new construction of a two-component ridge filter (the corresponding patent is pending). We have performed a series of calculations with the Monte-Carlo code SRNA in order to find the optimal construction from the point of view of dose delivery accuracy and of the device manufacturability. With that ridge filter the 95% isodose does not notably leave the tumor volume. The usual 'wings' of isodoses on proximate side are now absent and the volume of irradiated healthy tissue is significantly reduced. The experimental tests with proton beams are now in progress. PB - JACoW CP - Geneva, Switzerland SP - 464 EP - 466 KW - proton KW - target KW - scattering KW - radiation KW - ion DA - 2017/02 PY - 2017 SN - 978-3-95450-181-6 DO - 10.18429/JACoW-RuPAC2016-WEPSB045 UR - http://jacow.org/rupac2016/papers/wepsb045.pdf ER -