Surgery – Diagnostic testing – Detecting nuclear – electromagnetic – or ultrasonic radiation
Patent
1997-10-20
1999-10-26
Jaworski, Francis J.
Surgery
Diagnostic testing
Detecting nuclear, electromagnetic, or ultrasonic radiation
A61B 806
Patent
active
059719273
ABSTRACT:
An interested region including an interested blood vessel of a subject is scanned by a plurality of ultrasonic waves so as to receive a plurality of echo signals. A plurality of Doppler signals is detected from the echo signals in connection with a plurality of sample points in the interested region. An average frequency of the blood current of the interested blood vessel, variance, and power are calculated based on the Doppler signals. A sample point positioned on the interested blood vessel is picked up from the plurality of samples every time phase based on the average frequency or power. A time curve is formed based on at least one of the average frequency of the picked up sample point, the variance, and power. Thereby, it is possible to compensate for the state that a sample volume is detached from the interested blood vessel as in the conventional case. After plural Doppler images were in a Doppler memory by `Freeze` operation, a ROI is set on the memorized images and a spectrum Doppler image for blood vessels in the ROI is formed. The ROIs are set on images while confirming moving blood vessels. A change of the velocity of the vessels is observed. Indexes such as an RI (Resistance Index) are calculated and help a diagnosis.
REFERENCES:
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patent: 5485844 (1996-01-01), Uchibori
patent: 5551434 (1996-09-01), Iinuma
Imam Ali M.
Jaworski Francis J.
Kabushiki Kaisha Toshiba
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