Passive twin-layer spatial-temporal phase-interference compensator for improved ultrasound propagation: A computer-simulation and experimental study in acrylic step-wedge samples

Langton, Christian

doi:10.1016/j.apacoust.2017.06.026

Cited by 4 publications

(4 citation statements)

References 15 publications

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“…If it not possible to obtain a UPIC material that has the same ultrasound velocity as the test sample material, then a twin-layer UPIC is required to meet the criteria of consistent propagation path-length (z o ) and consistent transit time (t o ) across the sample [9]. Two simultaneous equations are solved, for path-length and transit time respectively, utilising two UPIC materials whose velocity are respectively greater-than (v u1 ), and less-than (v u2 ), the sample material velocity (v s ).…”

Section: Scenario 2: Upic Materials Velocity Cannot Match Single Mate...mentioning

confidence: 99%

“…As previously reported [9], the thickness of the first UPIC layer is calculated from equation (8), where t s-max is the maximum transit time through the sample alone.…”

Section: Scenario 2: Upic Materials Velocity Cannot Match Single Mate...mentioning

confidence: 99%

“…Most recently, the author has introduced a 'passive' means aimed to reduce ultrasound wave degradation through complex tissue structures. The ultrasound phase-interference compensator (UPIC) consists of an additional 3D-printed material layer positioned between the ultrasound transducer and test sample [7]. The UPIC concept is fundamentally simple, it creates an environment of constant path-length (spatial criterion, z o ) and constant transit time (temporal criterion, t o ) throughout the test sample.…”

Section: Introductionmentioning

confidence: 99%

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Design of a 3D-printed ultrasound phase-interference compensator (UPIC) for various test sample environment scenarios

Langton¹

2019

Biomed. Phys. Eng. Express

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For ultrasound propagation through a complex tissue composite such as the skull, phase-interference induced wave degradation may occur due to anatomical variations in shape and composition. A fundamentally simplistic passive twin-layer ultrasound phase-interference compensator (UPIC) has recently been introduced, creating an environment of constant path-length (spatial criterion) and constant transit time (temporal criterion) throughout the test sample. The aim of this Note was to develop UPIC designs for various test sample environment scenarios ranging from both sample and UPIC created from the same 3D print material, a single sample material whose ultrasound velocity may not be matched by a 3D print material, to a multi-material compartment sample of complex shape. A simplified solution is presented where a rectangular analysis region may be defined. Future clinical development of the UPIC concept could utilise conventional DICOM-format x-ray CT and MR image data within the design process.

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Section: Scenario 2: Upic Materials Velocity Cannot Match Single Mate...mentioning

confidence: 99%

“…As previously reported [9], the thickness of the first UPIC layer is calculated from equation (8), where t s-max is the maximum transit time through the sample alone.…”

Section: Scenario 2: Upic Materials Velocity Cannot Match Single Mate...mentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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Design of a 3D-printed ultrasound phase-interference compensator (UPIC) for various test sample environment scenarios

Langton¹

2019

Biomed. Phys. Eng. Express

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“…A novel ‘passive’ approach has recently been proposed in which constant transit time may be achieved by incorporating an additional material layer. 10 Hence, this ultrasound phase-interference compensator (UPIC) provides a solution based on variable propagation rather than variable transmission of ultrasound pulses. It is hypothesised that the ‘passive’ UPIC concept offers a broad utility, where it may be applied to single element and linear-array ultrasound transducers of any frequency and dimension, along with utility to both pulse-echo-mode diagnostic imaging and transmission-mode therapeutic transcranial applications.…”

Section: Introductionmentioning

confidence: 99%

A 3D-printed passive ultrasound phase-interference compensator for reduced wave degradation in cancellous bone – an experimental study in replica models

2018

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The current ‘active’ solution to overcome the impediment of ultrasound wave degradation associated with transit-time variation in complex tissue structures, such as the skull, is to vary the transmission delay of ultrasound pulses from individual transducer elements. This article considers a novel ‘passive’ solution in which constant transit time is achieved by propagating through an additional material layer positioned between the ultrasound transducer and the test sample. To test the concept, replica models based on four cancellous bone natural tissue samples and their corresponding passive ultrasound phase-interference compensator were 3D-printed. Normalised broadband ultrasound attenuation was used as a quantitative measure of wave degradation, performed in transmission mode at a frequency of 1 MHz and yielding a reduction ranging from 57% to 74% when the ultrasound phase-interference compensator was incorporated. It is suggested that the passive compensator offers a broad utility and, hence, it may be applied to any ultrasound transducer, of any complexity (single element or array), frequency and dimension.

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Sub-transducer element spatial resolution ultrasound wavefront modification using passive twin-layer compensators

et al. 2018

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Passive twin-layer spatial-temporal phase-interference compensator for improved ultrasound propagation: A computer-simulation and experimental study in acrylic step-wedge samples

Cited by 4 publications

References 15 publications

Design of a 3D-printed ultrasound phase-interference compensator (UPIC) for various test sample environment scenarios

Design of a 3D-printed ultrasound phase-interference compensator (UPIC) for various test sample environment scenarios

A 3D-printed passive ultrasound phase-interference compensator for reduced wave degradation in cancellous bone – an experimental study in replica models

Sub-transducer element spatial resolution ultrasound wavefront modification using passive twin-layer compensators

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