Simplified controls for implementing depth-based gain control in ultrasound systems

Abstract

An improved approach for implementing depth-based gain control is implemented by adjusting the gain at each depth in the image based on a family of stored curves, with each curve in the family specifying the gain adjustment for all depths as a function of depth. A user interface enables the user to select an entire curve at once (as opposed to the prior art approach of using a set of individuallyand independently adjustable gain controls for each depth range). The selected curve is then used to modify the gain adjustment provided by the default time gain compensation (TGC) curve.

Description

[0001] Cross References to Related Applications [0002] This application claims priority to US Provisional Application No. 60 / 886,481, filed January 24, 2007, the contents of which are hereby incorporated by reference. Background technique [0003] Conventional ultrasound machines operate by sending pulses of ultrasound energy, then receiving ultrasound return signals that have been reflected from the relevant anatomy, and processing the return signals into images. Due to the finite velocity of sound, return signals arriving first correspond to shallower depths, while return signals arriving later in time correspond to deeper depths. Since ultrasound energy is attenuated both on its way from the transducer to the target area and on its way back to the transducer from the target area, many prior art systems compensate for this by using Time Gain Compensation (TGC). Attenuation to provide additional amplification for later arriving signals corresponding to deeper depths. Sin...

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Problems solved by technology

[0004] However, since the materials through which ultrasonic energy travels in real-world applications are typically inhomogeneous, the actual attenuation experienced by the ultrasonic energy will generally not be a linear function of distance

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