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US 11,073,623 B2Granted
Radiation measuring instrument and radiation imaging apparatus
AssigneeShimadzu Corporation
InventorSoichiro Kashiwa
Life of this patent
Estimating the term…
Abstract
The radiation measuring instrument is configured such that a control unit (12) corrects radiation dose information according to a measured value of a barometer (13) based on both a first ionization current caused by electrons generated by interaction between radiation and air and a second ionization current caused by electrons generated by interaction between the radiation and an incident-side electrode (11b).
Claims5
A radiation measuring instrument comprising:
- an ionization chamber including an incident-side electrode provided at an incident port on which radiation is incident and an exit-side electrode provided at an exit port, the ionization chamber being configured to measure an ionization current generated by radiation transmitted through the incident-side electrode;
- a barometer configured to measure atmospheric pressure in the ionization chamber;
- and
- a control unit configured to obtain radiation dose information based on the ionization current,
- wherein the control unit is configured to correct the radiation dose information according to a measured value of the barometer based on both a first ionization current caused by electrons generated by interaction between radiation and air and a second ionization current caused by electrons generated by interaction between the radiation and the incident-side electrode.
2 more elements
A radiation imaging apparatus comprising:
- a radiation irradiation unit configured to irradiate a subject with radiation;
- a radiation detection unit configured to detect radiation transmitted through the subject;
- and
- a radiation measuring instrument arranged between the radiation irradiation unit and the radiation detection unit, the radiation measuring instrument being configured to measure a radiation dose of the radiation emitted from the radiation irradiation unit,
- wherein the radiation measuring instrument includes:
- an ionization chamber including an incident-side electrode provided at an incident port on which radiation is incident and an exit-side electrode provided at an exit port, the ionization chamber being configured to measure an ionization current generated by radiation transmitted through the incident-side electrode;
- a barometer configured to measure atmospheric pressure in the ionization chamber;
- and
- a control unit configured to obtain radiation dose information based on the ionization current,
- wherein the control unit is configured to correct the radiation dose information according to a measured value of the barometer based on both a first ionization current caused by electrons generated by interaction between radiation and air and a second ionization current caused by electrons generated by interaction between the radiation and the incident-side electrode.
7 more elements
Dependencies are inferred from the claim text.