Konrad Engel, Eckhard Tabbert
Fast Simultaneous Angle, Wedge, and Beam Intensity Optimization in Inverse Radiotherapy Planning
Preprint series: Preprints aus dem Fachbereich Mathematik, Universität Rostock
92C50 Medical applications (general)
90C30 Nonlinear programming
PACS: 87.53.Tf
Abstract: We present a new very fast radiotherapy planning algorithm which
determines approximatively optimal gantry and table angles, kinds
of wedges, leaf positions and intensities simultaneously in a
global way. Other parameters are optimized locally, i.e.
independently of each other. The algorithm uses an elaborated
field management and field reduction. Beam intensities are
determined via a variant of a projected Newton method of
Bertsekas. The objective function is a standard piecewise
quadratic penalty function, but it is built with efficient upper
bounds which are calculated during the optimization process.
Instead of pencil beams basic leaf positions are included. The
algorithm is implemented in the new beam modelling and dose
optimization modul {\sc Homo OptiS}.
Keywords: 3D treatment planning, radiation therapy optimization, intensity modulated beams, beam orientation, beam weight, wedge