Surgery – Truss – Pad
Patent
1995-11-13
1997-05-13
Jaworski, Francis
Surgery
Truss
Pad
A61B 800
Patent
active
056283199
DESCRIPTION:
BRIEF SUMMARY
BACKGROUND OF THE INVENTION
1. Field of the Invention
The invention relates to a method and a device for non-destructive testing of objects using ultrasonics, whereby ultrasonic pulses are introduced by an ultrasonic testing head into the respective object, and whereby ultrasonic waves are emitted by the object in response to the ultrasonic pulses introduced and are then picked up by an ultrasonic testing head and converted into electrical signals of a signal sequence.
2. Prior Art
In medical technology, an ultrasonic examination method for diagnostic purposes is known in which ultrasonic vibrations are introduced into a body to be examined that then generates ultrasonic echoes which are converted by an ultrasonic converter into electrical signals. The radiation direction of the ultrasonic vibrations is gradually changed in identical angular steps using mechanical or electronic means. An examination area in the body is limited by the two outer radiation directions. The ultrasonic echoes reflected along the paths preset by the radiation directions are converted into a sequence of measurement values that represent the reflection properties of the examination area at various measurement points that are associated with picture points of an ultrasonic image displayed on a monitor. For each picture point of the ultrasonic image, a picture value is calculated by interpolation of the measured values of those measurement points adjacent to the picture point as a result of the geometrical association between the examined area and the ultrasonic image (DE 36 40 882 A1).
In medical technology, a method is also known for delay determination of ultrasonic pulses passing through an examined area and converted by an ultrasonic converter into an electrical measurement signal. After emission of the ultrasonic pulse, the time that passes until the measurement signal has reached a preset threshold is measured. The measurement signal is amplified and fed to an analog/digital converter working with a predetermined sampling rate. The sample values of the analog/digital converter are stored. An excerpt from the measurement signal formed by a sequence of sample values is compared with an identical-length excerpt of a reference signal stored as a sequence of reference values. The excerpt of the reference signal and if necessary that of the measurement signal are displaced one node at a time until the displaced sections match up best when they are again compared with one another. The delay is determined by a digital processor, which can also have controlling function, by correction of the period thus ascertained. The sequence of reference values, which is if possible precisely proportional to the sample values of the excerpt, is found with a function which is a yardstick for the divergence of the measurement signal excerpt scaled with one factor from a correspondingly long excerpt of the reference signal (DE 32 42 284 A1).
Also known is an ultrasonic imaging device for medical diagnostic technology, having an ultrasonic converter that introduces an ultrasonic beam into a body in order to achieve sector sampling. The ultrasonic converter converts ultrasonic echo waves into echo signals that are sampled in intervals that are shorter than the division of the pixels or picture elements. The measurement values sampled along each sampling line are stored as pixel data. The data disposed at those points of two adjacent sampling lines that are identically spaced from a beam emission point are used to obtain interpolation data (DE 36 32 813 A1).
In a known method for determining the amplitude and the amplitude position of the maximum of a correlation signal, a correlator is supplied with a digitalized picture signal and a digitalized reference image. The correlator generates the correlation signal, which is passed to a memory with maximum detector that calculates the amplitude and the amplitude position. The calculated values are then interpolated in order to determine the real maximum of more closely approximated values (DE 38 12 195 A1).
REFERENCES:
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A. Klauer and M. Pandit, "Messignalverarbeitung mit hochaflosender AD-Wandlung", Technisches Messen tm, 52. Jahrgang, Heft Nov. 1985.
A. Duschek, "Vorlesungen uber hohere Mathematik", Unveranderter Nachdruck der dritten, verbesserten Auflage, Springer-Verlag, 1965.
ROS et al: "Digital techniques improve range measurements with ultasound snesor", Sensors and actuators A, vol. A32, No. 1/3, Apr. 1992, pp. 550-554 XP287373.
Koch Roman
Kreutter Thomas
Jaworski Francis
Nukem GmbH
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