Combined laser spirometer motion tracking system for radiotherapy
First Claim
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1. A respiration monitor comprising:
- a spirometer adapted to receive air flow from a patient'"'"'s lungs with breathing to provide an air flow signal;
a chest displacement sensor adapted to monitor displacement of the patient'"'"'s chest with breathing to provide a chest displacement signal;
a calibration circuit receiving the air flow signal and the chest displacement signal to provide a corrected respiration signal combining information from both the air flow signal and the chest displacement signal;
an integrator receiving the air flow signal to produce a lung volume signal; and
a baseline corrector receiving the lung volume signal and the chest displacement signal to correct an integration offset of the lung volume signal to produce the corrected respiration signal based on the chest displacement signal.
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Abstract
An improved non-invasive respiration monitor combines signals from a spirometer and laser chest displacement sensor to reduce signal error. The improved respirations signal can be used for position correction in radiation therapy and imaging applications and can be displayed to a user in breath control techniques.
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Citations
21 Claims
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1. A respiration monitor comprising:
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a spirometer adapted to receive air flow from a patient'"'"'s lungs with breathing to provide an air flow signal; a chest displacement sensor adapted to monitor displacement of the patient'"'"'s chest with breathing to provide a chest displacement signal; a calibration circuit receiving the air flow signal and the chest displacement signal to provide a corrected respiration signal combining information from both the air flow signal and the chest displacement signal; an integrator receiving the air flow signal to produce a lung volume signal; and a baseline corrector receiving the lung volume signal and the chest displacement signal to correct an integration offset of the lung volume signal to produce the corrected respiration signal based on the chest displacement signal. - View Dependent Claims (2, 3, 11)
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4. A respiration monitor comprising:
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a spirometer adapted to receive air flow from a patient'"'"'s lungs with breathing to provide an air flow signal; a chest displacement sensor adapted to monitor displacement of the patient'"'"'s chest with breathing to provide a chest displacement signal; a calibration circuit receiving the air flow signal and the chest displacement signal to provide a corrected respiration signal combining information from both the air flow signal and the chest displacement signal; an integrator receiving the air flow signal to produce a lung volume signal; and a model of the relationship between lung volume and chest displacement signal, the model receiving the chest displacement signal to provide a lung volume signal as the corrected respiration signal. - View Dependent Claims (5, 6, 7, 8, 9, 10)
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12. A method of generating a corrected respiration signal comprising the steps of:
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(a) monitoring a patient'"'"'s breathing with a spirometer adapted to receive air flow from a patient'"'"'s lungs to provide an air flow signal; (b) monitoring the patient'"'"'s breathing with a chest displacement sensor adapted to monitor displacement of the patient'"'"'s chest with breathing to provide a chest displacement signal; (c) combining the air flow signal and the chest displacement signal to provide a corrected respiration signal; (d) integrating the air flow signal to produce a lung volume signal; and (e) using the chest displacement signal to correct an integration offset of the lung volume signal to produce the corrected respiration signal. - View Dependent Claims (13, 14)
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15. A method of generating a corrected respiration signal comprising the steps of:
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(a) monitoring a patient'"'"'s breathing with a spirometer adapted to receive air flow from a patient'"'"'s lungs to provide an air flow signal; (b) monitoring the patient'"'"'s breathing with a chest displacement sensor adapted to monitor displacement of the patient'"'"'s chest with breathing to provide a chest displacement signal; (c) combining the air flow signal and the chest displacement signal to provide a corrected respiration signal; (d) integrating the air flow signal to produce a lung volume signal; and (e) applying the lung volume signal to a model of the relationship between the lung volume and chest displacement signals to provide a lung volume signal as the corrected respiration signal. - View Dependent Claims (16, 17, 18, 19, 20, 21)
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Specification