IMRT, IGRT, SBRT - Advances in the Treatment Planning and Delivery of Radiotherapy

Editor(s): Meyer J.L. (San Francisco, Calif.) 
Kavanagh B.D. (Aurora, Colo.) 
Purdy J.A. (Sacramento, Calif.) 
Timmerman R. (Dallas, Tex.) 
Table of Contents
Vol. 40, No. , 2007
Section title: I. IMRT and IGRT Techniques and Technology
Front Radiat Ther Oncol. Basel, Karger, 2007, vol. 40, pp 59-71

Four-Dimensional Imaging and Treatment Planning of Moving Targets

Chen G.T.Y. · Kung J.H. · Rietzel E.
Department of Radiation Oncology, Massachusetts General Hospital, Boston, Mass. , USA

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Four-dimensional CT acquisition is commercially available, and provides important information on the shape and trajectory of the tumor and normal tissues. The primary advantage of four-dimensional imaging over light breathing helical scans is the reduction of motion artifacts during scanning that can significantly alter tumor appearance. Segmentation, image registration, visualization are new challenges associated with four-dimensional data sets because of the overwhelming increase in the number of images. Four-dimensional dose calculations, while currently laborious, provide insights into dose perturbations due to organ motion. Imaging before treatment (image guidance) improves accuracy of radiation delivery, and recording transmission images can provide a means of verifying gated delivery.

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