Abstract: An asymmetric dual-mode ionization chamber measurement system can include a first high-voltage plate, a second high-voltage plate and a readout plate. The first high-voltage plate can be disposed from the readout plate by a first active volume. The second high-voltage plate can be disposed from the readout plate by a second active volume. A high-voltage potential can be coupled to the first high-voltage plate during a first mode, and to the second high-voltage plate during a second mode. Ion pairs generated by a radiation stream passing through the first active volume during the first mode and the second active volume during the second mode can be measured at the readout plate to determine a radiation rate of the ionizing radiation. The asymmetric dual-mode ionization chamber measurement system can advantageously measure different radiation streams that have significantly different ranges of radiation rates flux.

Abstract: Techniques for closed-loop feedback beam control in particle therapy delivery system can include receiving treatment plan beam parameters, receiving a determined output beam current of a present spot, generating an adjusted source beam current set point based on the treatment plan beam parameters and the determined output beam current of the present spot, and adjusting an output beam current of the present spot based on the adjusted source beam current.

Abstract: An asymmetric dual-mode ionization chamber measurement system can include a first high-voltage plate, a second high-voltage plate and a readout plate. The first high-voltage plate can be disposed from the readout plate by a first active volume. The second high-voltage plate can be disposed from the readout plate by a second active volume. A high-voltage potential can be coupled to the first high-voltage plate during a first mode, and to the second high-voltage plate during a second mode. Ion pairs generated by a radiation stream passing through the first active volume during the first mode and the second active volume during the second mode can be measured at the readout plate to determine a radiation rate of the ionizing radiation. The asymmetric dual-mode ionization chamber measurement system can advantageously measure different radiation streams that have significantly different ranges of radiation rates flux.

Abstract: An asymmetric dual-mode ionization chamber measurement system can include a first high-voltage plate, a second high-voltage plate and a readout plate. The first high-voltage plate can be disposed from the readout plate by a first active volume. The second high-voltage plate can be disposed from the readout plate by a second active volume. A high-voltage potential can be coupled to the first high-voltage plate during a first mode, and to the second high-voltage plate during a second mode. Ion pairs generated by a radiation stream passing through the first active volume during the first mode and the second active volume during the second mode can be measured at the readout plate to determine a radiation rate of the ionizing radiation. The asymmetric dual-mode ionization chamber measurement system can advantageously measure different radiation streams that have significantly different ranges of radiation rates flux.

Abstract: An asymmetric dual-mode ionization chamber measurement system can include a first high-voltage plate, a second high-voltage plate and a readout plate. The first high-voltage plate can be disposed from the readout plate by a first active volume. The second high-voltage plate can be disposed from the readout plate by a second active volume. A high-voltage potential can be coupled to the first high-voltage plate during a first mode, and to the second high-voltage plate during a second mode. Ion pairs generated by a radiation stream passing through the first active volume during the first mode and the second active volume during the second mode can be measured at the readout plate to determine a radiation rate of the ionizing radiation. The asymmetric dual-mode ionization chamber measurement system can advantageously measure different radiation streams that have significantly different ranges of radiation rates flux.