Film phantom for three-dimensional dosimetry
First Claim
1. A film phantom system for recording and verifying three-dimensional dose distributions, the film phantom system comprising:
- a body of tissue-equivalent material, the body surrounding a cavity capable of receiving a stack of sheets of film separated by tissue-equivalent spacers;
the cavity having walls, the walls including at least one translucent area which extends through at least one opaque area of the walls, the at least one translucent area configured to intersect edges of different sheets of film in a stack of sheets of film in the chamber at different locations.
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Abstract
A method and system for recording and verifying three-dimensional dose distributions a film phantom uses a phantom which includes a cavity for receiving film sheets. A three-dimensional radiation dose described by a stereotactic radiosurgery plan can be delivered to the phantom while the cavity is loaded with film. The film can be developed to provide multiple dose images. Thereafter, based on the multiple dose images, a measured three-dimensional dose distribution map is obtained. The phantom may have a pattern of translucent areas which expose fiducial marks on the film. The fiducial marks may be used to determine a position and orientation of the film relative to the phantom.
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Citations
24 Claims
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1. A film phantom system for recording and verifying three-dimensional dose distributions, the film phantom system comprising:
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a body of tissue-equivalent material, the body surrounding a cavity capable of receiving a stack of sheets of film separated by tissue-equivalent spacers;
the cavity having walls, the walls including at least one translucent area which extends through at least one opaque area of the walls, the at least one translucent area configured to intersect edges of different sheets of film in a stack of sheets of film in the chamber at different locations. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13)
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14. A method of recording and verifying three-dimensional dose distributions, the method comprising:
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providing a phantom including a tissue equivalent body surrounding a cavity;
loading multiple layers of film separated by multiple spacers having tissue-equivalent characteristics into the cavity;
delivering radiation to the body including the multiple layers of film;
before, during or after delivering the radiation to the body, allowing light to pass through translucent areas in walls of the cavity to expose a pattern of fiducial marks on edges of the multiple layers of film, the pattern being different for each of the multiple layers of film;
removing the multiple layers of film from the cavity;
obtaining multiple dose images based on the multiple layers of film;
using the patterns of fiducial marks exposed on the edges of the multiple layers of film to arrange the multiple dose images in sequence. - View Dependent Claims (15, 16, 17, 18, 19, 20, 21, 22, 23, 24)
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Specification