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Automatic Creation and Positioning of Particle Beams for Large Targets

IP.com Disclosure Number: IPCOM000202281D
Original Publication Date: 2010-Dec-13
Included in the Prior Art Database: 2010-Dec-13
Document File: 3 page(s) / 124K

Publishing Venue

Siemens

Related People

Juergen Carstens: CONTACT

Abstract

Due to their hardware characteristics, medical radiation treatment machines generally have a limited isofield. This field describes the maximum area of the patient’s body which can be exposed to the beams emitted by the radiation treatment machine. Because of these limitations, tumors with a size larger than the isofield can not be radiated at once, but need to be radiated various times by precisely positioned beams in order to have an impact on the entire tumor. Each of the beams used to treat the tumor has a certain isocenter, the point where the central beam of radiation passes. In order to treat the whole tumor, the treating clinician needs to manually adjust the isocenter and overlap beams to distribute the dose evenly. At the moment, there are computer based software solutions in existence, which provide automatic positioning for the isocenters of radiation beams. But these so called Treatment Planning Systems (TPS) are only able to do so for small sized tumors which do not exceed the size of isofield. The treatment of bigger tumors is very time consuming due to extensive manual adjustments. Therefore some hospitals are not treating affected patients currently.

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Automatic Creation and Positioning of Particle Beams for Large Targets

Idea: Murali Shettihalli, IN-Bangalore

Due to their hardware characteristics, medical radiation treatment machines generally have a limited isofield. This field describes the maximum area of the patient's body which can be exposed to the beams emitted by the radiation treatment machine. Because of these limitations, tumors with a size larger than the isofield can not be radiated at once, but need to be radiated various times by precisely positioned beams in order to have an impact on the entire tumor. Each of the beams used to treat the tumor has a certain isocenter, the point where the central beam of radiation passes. In order to treat the whole tumor, the treating clinician needs to manually adjust the isocenter and overlap beams to distribute the dose evenly.

At the moment, there are computer based software solutions in existence, which provide automatic positioning for the isocenters of radiation beams. But these so called Treatment Planning Systems (TPS) are only able to do so for small sized tumors which do not exceed the size of isofield. The treatment of bigger tumors is very time consuming due to extensive manual adjustments. Therefore some hospitals are not treating affected patients currently.

In the following a novel solution is proposed which consists in a software application for the automatic creation and positioning of radiation beams for the treatment of large tumors. As a first step, the proposed software projects the given contour points of the large tumor onto the isocenter plane as shown in Figure 1. The reduction from three to two dimensions is simplifying the following steps while the selection of the isocenter plane supports the understanding of the target's dimensions from the beams direction. In the next step, the contour points are converted onto a beam coordinate system. In this system, the minimum and maximum values in x-direction and y-direction are identified in order to find a boundary box bordering the tumor as shown in Figure 2. Since in most cases this first obtained...