Radiant energy – Radiation controlling means
Reexamination Certificate
2005-05-10
2005-05-10
Wells, Nikita (Department: 2881)
Radiant energy
Radiation controlling means
C250S503100, C250S496100, C250S515100, C250S397000, C378S147000
Reexamination Certificate
active
06891178
ABSTRACT:
A method is provided for determining the positional accuracy of leaves of a multileaf collimator for delivering doses of radiation to a particular spatial location for treatment purpose. The method could be implemented as routine quality assurance check of the multileaf collimator leaf positioning errors. The method includes producing a first field and producing a second field, which is different from the first field. A dosimeter means is included for measuring a radiation dose difference or ratio between the first field and the second field at at least one spatial location. The dose difference or ratio is then used to determine the positional accuracy of the leaves by comparing with a known relationship between leaf positional errors and relative dosimeter outputs. The method provides a more simplified, accurate, efficient and reliable method over currently used methods.
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Lumen Intellectual Property Services Inc.
The Board of Trustees of the Lealand Stanford Junior University
Wells Nikita
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