Methods of in vivo radiation measurement
First Claim
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1. The method for in vivo monitoring of radiation applied to a patient, the method comprising the steps of:
- placing a radiation source at a fixed location inside the patient'"'"'s body;
inserting a radiation sensitive MOSFET inside the patient'"'"'s body in close proximity to said radiation source, said MOSFET having a threshold voltage that changes in accordance with the cumulative radiation dosage;
removing said MOSFET from the body after a period of radiation; and
measuring the change in threshold voltage caused by the radiation from said source after said MOSFET has been removed from the body.
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Abstract
Methods of and apparatus for in vivo radiation measurements relay on a MOSFET dosimeter of high radiation sensitivity with operates in both the passive mode to provide an integrated dose detector and active mode to provide an irradiation rate detector. A compensating circuit with a matched unirradiated MOSFET is provided to operate at a current designed to eliminate temperature dependence of the device. Preferably, the MOSFET is rigidly mounted in the end of a miniature catheter and the catheter is implanted in the patient proximate the radiation source.
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5 Claims
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1. The method for in vivo monitoring of radiation applied to a patient, the method comprising the steps of:
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placing a radiation source at a fixed location inside the patient'"'"'s body; inserting a radiation sensitive MOSFET inside the patient'"'"'s body in close proximity to said radiation source, said MOSFET having a threshold voltage that changes in accordance with the cumulative radiation dosage; removing said MOSFET from the body after a period of radiation; and measuring the change in threshold voltage caused by the radiation from said source after said MOSFET has been removed from the body. - View Dependent Claims (2, 3, 4, 5)
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Specification