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

Claim 13:
14. A radiation therapy system comprising:
a particle or energy source;
a beam transport system coupled to the particle or energy source;
a beam applicator coupled to the beam transport system; and
an ionization chamber measurement system coupled to the beam applicator, wherein the ionization chamber measurement system includes
a high-voltage supply configured to generate a high-voltage potential,
a readout plate,
a first high-voltage plate disposed to form a first active volume between the first high-voltage plate and the readout plate,
a second high-voltage plate disposed to form a second active volume between the second high-voltage plate and the readout plate,
a switch matrix configured to selectively couple the high-voltage potential to the first high-voltage plate in a first mode, and couple the high-voltage potential to the second high-voltage plate in a second mode, and
an ion charge measurement circuit coupled to the readout plate, the ion charge measurement circuit configured to measure ions generated by ionizing radiation passing through the first active volume in the first mode and to measure ions generated by the ionizing radiation passing through the second active volume in the second mode.