Dose rate monitor, system and method
AssigneeVarian Medical Systems, Inc.
InventorsReza Alibazi Behbahani, Flavio Poehlmann-Martins
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Abstract
A radiotherapy dose rate monitor system includes an emitting electrode configured to be impinged by radiotherapy radiation; a collecting electrode configured to form an electrical circuit with said emitting electrode, a current measurement device configured to measure a current through said emitting and collecting electrodes indicative of a dose of said radiotherapy radiation, and a chamber enclosing a gas. Emission of secondary electrons from the emitting electrode provides a majority of the current.
Claims22
A radiotherapy dose rate monitor system comprising:
- an emitting electrode configured to be impinged by radiotherapy radiation;
- a collecting electrode configured to form an electrical circuit with said emitting electrode;
- a current measurement device configured to measure a current through said emitting and collecting electrodes indicative of a dose of said radiotherapy radiation;
- a chamber enclosing a gas, and
- wherein emission of secondary electrons from said emitting electrode provides a majority of said current.
A radiotherapy dose rate monitor system comprising:
- a gas enclosed between a complementary pair of electrodes,
- wherein said dose rate monitor system is operable to measure current corresponding to a radiation dose rate,
- wherein said dose rate monitor system is operable in a first mode or a second mode,
- wherein in said first mode less than 20 percent of said current is due to collection of electron/ion pairs at said electrodes due to ionization of said gas and
- wherein in said second mode less than 20 percent of said current is due to collection of secondary electrons.
A radiotherapy dose rate monitor system comprising:
- a monitor chamber comprising:
- a first electrode;
- a second electrode;
- a sidewall coupling said first and second electrodes;
- a gas contained within said monitor chamber;
- a voltage source functionally coupled to said first and second electrodes;
- a current sensor configured to measure a current through said first and second electrodes,
- wherein said current is indicative of a radiation dose passing through said monitor chamber, and
- wherein said radiotherapy dose rate monitor system is configured to measure radiotherapy dose rates of greater than or equal to 40 Gy/s to an accuracy of better than 98% during patient treatment.
Dependencies are inferred from the claim text.