Apparatus and method for compensation of movements of a target volume during ion beam irradiation
First Claim
1. Apparatus for compensation of three-dimensional movements of a target volume (1) on a patient support apparatus (2) during ion beam irradiation using a raster scanning apparatus (3),wherein a compensation apparatus comprises:
- a position location and tracking system (4) which detects the three-dimensional movements of the target volume (1), anda depth modulator (6) which re-adjusts the depth of penetration w of the ion beam (5),the raster scanning apparatus (3), which deflects the ion beam (5) transversely and which is in operative connection with a location measurement, control and read-out module (SAMO) and a module for changing the beam excursion (SAMS), whereinthe position location and tracking system (4) is in operative connection with a movement measurement, control and read-out module SAMB;
and the depth modulator (6) is in operative connection with the movement measurement, control and read-out module SAMB,and the movement measurement, control and read-out module (SAM B) comprising a microprocessor having a memory,and the memory comprising data of a model of a structure of healthy tissue that covers the target volume (1) in the upstream direction of the beam, and the microprocessor comprising computational components which break down the detected movements of the target volume (1) vectorially into longitudinal and transverse components relative to the ion beam (5) and which compare the longitudinal components with the stored model for correction of the depth of penetration w of the ion beam (5).
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Abstract
The invention relates to an apparatus and method for compensation of three-dimensional movements of a target volume (1) during ion beam irradiation. For the purpose, the apparatus comprises a position location and tracking system (4) for detecting the movements and a depth modulator (6) for modifying the depth of penetration of the ion beam. For the purpose of compensation, the movements are divided vectorially into a transverse component and a longitudinal component. The transverse component is compensated from irradiation point to irradiation point using the raster scanning apparatus (3) and the longitudinal component is compensated from irradiation point to irradiation point using the depth modulator (6) by means of the fact that, in addition to the change in the location of the target volume, the change in the structure of healthy tissue covering the target volume is, in the preliminaries to irradiation, detected and modelled and stored in the form of a look-up table in a memory of a movement measurement, control and read-out module SAMB and compared with the actual values during irradiation.
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Citations
38 Claims
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1. Apparatus for compensation of three-dimensional movements of a target volume (1) on a patient support apparatus (2) during ion beam irradiation using a raster scanning apparatus (3),
wherein a compensation apparatus comprises: -
a position location and tracking system (4) which detects the three-dimensional movements of the target volume (1), and a depth modulator (6) which re-adjusts the depth of penetration w of the ion beam (5), the raster scanning apparatus (3), which deflects the ion beam (5) transversely and which is in operative connection with a location measurement, control and read-out module (SAMO) and a module for changing the beam excursion (SAMS), wherein the position location and tracking system (4) is in operative connection with a movement measurement, control and read-out module SAMB; and the depth modulator (6) is in operative connection with the movement measurement, control and read-out module SAMB, and the movement measurement, control and read-out module (SAM B) comprising a microprocessor having a memory, and the memory comprising data of a model of a structure of healthy tissue that covers the target volume (1) in the upstream direction of the beam, and the microprocessor comprising computational components which break down the detected movements of the target volume (1) vectorially into longitudinal and transverse components relative to the ion beam (5) and which compare the longitudinal components with the stored model for correction of the depth of penetration w of the ion beam (5). - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12)
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13. Apparatus for modifying the depth of penetration of an ion beam in dependence upon movement of a patient on a patient support apparatus of a therapy facility, comprising
a position location and tracking system (4) for monitoring movements of the patient, a depth modulator for adjusting the depth of penetration of the ion beam into the patient, and a movement measurement and control unit which is connected to the position location and tracking system (4) and to the depth modulator and which receives information relating to the movement of the patient from the position location and tracking system (4) and controls the depth modulator for modifying the depth of penetration, wherein the movement measurement and control unit comprises a microprocessor having a memory, and the memory comprising data of a model of a structure of healthy tissue that covers the target volume in the upstream direction of the beam, and the microprocessor, with the aid of the model and the information relating to the movement of the patient, so controlling the depth modulator that the depth of penetration of the ion beam is adjusted to a target volume element in the patient irrespective of the movement of the patient, especially irrespective of the movement of the healthy tissue relative to the target volume.
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33. Method for compensation of three-dimensional movements of a target volume (1) on a patient couch (2) during ion beam irradiation using a raster scanning apparatus (3), the method comprising the following method steps:
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detecting a structure of healthy tissue covering the target volume (1) in the upstream direction of the beam; producing a digital model of the detected structure of the covering healthy tissue; storage of the model in a memory of the movement measurement, control and readout module (SAMB); positioning of the target volume (1) on a patient couch (2) in a treatment room (18); detecting three-dimensional movements of the target volume (1) in real time during the irradiation procedure by means of a position location and tracking system (4); vectorially dividing the movements into longitudinal and transverse components; compensating the transverse components of the movements by corrective control of raster scanning magnets (7, 8) of the raster scanning apparatus (3); compensating the longitudinal components of the movements by comparison with data of the stored model and comparison-based modification of the settings of a depth modulator (6). - View Dependent Claims (34, 35, 36, 37, 38)
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Specification