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ULTRASOUND SIGNAL ACQUISITION WITH INTERFERENCE SUBTRACTION

IP.com Disclosure Number: IPCOM000236636D
Publication Date: 2014-May-07
Document File: 6 page(s) / 116K

Publishing Venue

The IP.com Prior Art Database

Abstract

The proposed technique relates to reduce switching glitches and other coherent noise components that are the same on repeated pulses. The proposed technique removes the switching glitches in two steps. In first step, a dark-frame is acquired and stored where all receive beams are received while no transmit is active. The dark-frame data do not contain echo signals but contain the switching glitches and random noise. Multiple dark-frame acquisitions and averaging reduce the random noise while keeping the switching glitches. The glitches occur at the same time and with same amplitude every time the dark frame is repeated. Second step is a subsequent normal ultrasound acquisition with transmit active. For every receive beam the corresponding dark-beam is subtracted. Subsequently, the switching glitches and coherent noise are removed.

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ULTRASOUND SIGNAL ACQUISITION WITH INTERFERENCE SUBTRACTION

BRIEF ABSTRACT

The proposed technique relates to reduce switching glitches and other coherent noise components that are the same on repeated pulses. The proposed technique removes the switching glitches in two steps. In first step, a dark-frame is acquired and stored where all receive beams are received while no transmit is active. The dark-frame data do not contain echo signals but contain the switching glitches and random noise. Multiple dark-frame acquisitions and averaging reduce the random noise while keeping the switching glitches. The glitches occur at the same time and with same amplitude every time the dark frame is repeated. Second step is a subsequent normal ultrasound acquisition with transmit active. For every receive beam the corresponding dark-beam is subtracted. Subsequently, the switching glitches and coherent noise are removed.

KEYWORDS

Switching glitches, dark-frame, noise, coherent noise ultrasound, subtraction, artifacts

DETAILED DESCRIPTION

Generally, receive electronics are compromised in performance in two dimensional (2D) arrays due to power and space limitations. For example, electronic switches within the receiver are used to adjust receiver gain or to generate time delays during sub-aperture beamforming. To minimize space required, electronic switches tend to be implemented in simpler forms than if they were implemented on a larger ultrasound console. Switching glitches appear in the received signal when the electronic switches are actively toggled during receive period. The switching glitches appear as horizontal lines in an image. Conventional techniques minimizes the switching glitches, however, due to space and power limitations switching glitches are not completely eliminated. Removal of the switching glitches is difficult and expensive.

Similar to the switching glitches, other noise components that repeat identically among ultrasound receive lines are often created by digital circuits coupling into the analog receive path. The activity of digital control circuits is usually identically repeated for ultrasound lines in the same direction. Noise created by these digital circuits appears similar in the ultrasound image as the switching glitches described above. The digital noise could also be eliminated by improved electrical design, e.g. better grounding techniques or better power supplies. However such improvements become either expensive or impossible given the limited physical space.

Hence there exists a need for an efficient technique to remove switching glitches.

The proposed technique relates to reducing switching glitches and other coherent noise. Since switching glitches and coherent noise appear similar and are removed with the same technique the following description will on mention switching glitches.

The technique removes switching glitches in two steps. In a first step, a dark-frame is acquired and stored where all receive beams are receiv...