Patent ID: 11944845
Assignee: VARIAN MEDICAL SYSTEMS PARTICLE THERAPY GMBH & CO. KG
Field: Medical technology (Instruments)
Classification: CPC A  G  H | IPC A

Claim 8:
9. An asymmetric dual-mode ionization measurement method comprising:
coupling a high-voltage potential to a first high-voltage plate of an ionization chamber in a first mode, wherein the first high-voltage plate is separated from a readout plate by a first gap;
coupling the high-voltage potential to a second high-voltage plate of the ionization chamber in a second mode, wherein the second high-voltage plate is separated from the readout plate by a second gap;
passing an ionizing radiation having a first density range through the ionization chamber in the first mode;
passing an ionizing radiation have a second density range through the ionization chamber in the second mode;
measuring ion charge generated by the ionizing radiation on the readout plate in the first mode;
measuring the ion charge generated by the ionizing radiation on the readout plate in the second mode; and
outputting a measurement of a radiation rate of the ionizing radiation determined as a function of the measured ion charge and a state of an ionization mode signal.