Asymmetric dual-mode ionization systems and methods

[0006]In one embodiment, an ionization chamber measurement system can include a high-voltage supply, a readout plate, a first high-voltage plate, a second high-voltage plate, a switch matrix and an ion charge measurement circuit. The high-voltage supply can be configured to generate a high-voltage potential. The first high-voltage plate can be disposed to form a first active volume between the first high-voltage plate and the readout plate. The second high-voltage plate can be disposed to form a second active volume between second high-voltage plate and the readout plate. The switch matrix can be configured to couple the high-voltage potential to the first high-voltage plate during a first mode, and to couple the high-voltage potential to the second high-voltage plate during a second mode. The ion charge measurement circuit can be coupled to the readout plate. A radiation stream can be configured to pass through the first and second active volumes. The ion charge measurement circuit can be configured to measure ions generated by the radiation stream passing through the first active volume during the first mode and to measure ions generated by the radiation stream passing through the second active volume during the second mode.

[0007]In another embodiment, a dual-mode ionization measurement method can include receiving an indication of a first mode or a second mode. In the first

In cancerous tumors, ionizing radiation can damage t