Ultrasound intensity determining method and apparatus
First Claim
1. A method of determining the ultrasound attenuation coefficient of tissue comprising the steps of providing an ultrasound field intensity measuring transducer sized for insertion into the vicinity of a treatment site, providing an ultrasound field generating transducer, determining the free field intensity created by the generating transducer in response to various generating transducer exciting signal levels, determining the measuring transducer output in the free field in response to various generating transducer exciting signal levels, inserting the measuring transducer into the vicinity of the treatment site, positioning the generating transducer to create an ultrasound field at the treatment site, determining the distance from the generating transducer to the measuring transducer, applying an exciting signal to the generating transducer, determining the measuring transducer output, and determining the attenuation coefficient of the tissues between the generating transducer and the measuring transducer.
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Abstract
A method of treatment by ultrasound comprises providing a first, ultrasound field intensity-to-voltage transducer sized for insertion into the vicinity of a treatment site and a second ultrasound treatment transducer. The free field intensities created by the second transducer in response to various second transducer exciting signal levels are determined. The first transducer outputs in the free field in response to various second transducer exciting signal levels are also determined. The first transducer is inserted into the vicinity of the treatment site, and the second transducer is positioned to create an ultrasound field at the treatment site. The distance from the second transducer to the first transducer is determined. An exciting signal is applied to the second transducer. The output of the first transducer is determined. The level of the exciting signal applied to the second transducer, the determined distance and the first transducer output are employed to determine the attenuation coefficient of the tissues between the second transducer and the first transducer.
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Citations
11 Claims
- 1. A method of determining the ultrasound attenuation coefficient of tissue comprising the steps of providing an ultrasound field intensity measuring transducer sized for insertion into the vicinity of a treatment site, providing an ultrasound field generating transducer, determining the free field intensity created by the generating transducer in response to various generating transducer exciting signal levels, determining the measuring transducer output in the free field in response to various generating transducer exciting signal levels, inserting the measuring transducer into the vicinity of the treatment site, positioning the generating transducer to create an ultrasound field at the treatment site, determining the distance from the generating transducer to the measuring transducer, applying an exciting signal to the generating transducer, determining the measuring transducer output, and determining the attenuation coefficient of the tissues between the generating transducer and the measuring transducer.
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