A Comparison Between Urethane and Gel Test Objects for Ultrasound Imaging Performance Testing

Ultrasound ◽  
2007 ◽  
Vol 15 (2) ◽  
pp. 105-108 ◽  
Author(s):  
Hannah L. Green ◽  
Nicholas J. Dudley ◽  
Nicholas M. Gibson
Keyword(s):  
Ultrasound Imaging ◽  
Performance Testing ◽  
Imaging Performance ◽  
Test Objects

scholarly journals The Imaging Performance of Diagnostic Ultrasound Scanners Using the Edinburgh Pipe Phantom to Measure the Resolution Integral – 15 Years of Experience

2020 ◽  
Author(s):  
Carmel M. Moran ◽  
Scott Inglis ◽  
Karne McBride ◽  
Christopher Mcleod ◽  
Stephen D. Pye
Keyword(s):  
Clinical Practice ◽  
Ultrasound Imaging ◽  
Figure Of Merit ◽  
Integral Characteristic ◽  
Depth Of Field ◽  
Single Element ◽  
Effective Metric ◽  
Two Parameters ◽  
Imaging Performance ◽  
Single Figure

AbstractThe grayscale imaging performance of a total of 368 different scanner/transducer combinations from 39 scanner manufacturers measured over a period of 15 years is presented. Performance was measured using the resolution integral, a single figure-of-merit to quantify ultrasound imaging performance. The resolution integral was measured using the Edinburgh Pipe Phantom. Transducers included single element, linear, phased, curvilinear and multi-row arrays. Our results demonstrate that the resolution integral clearly differentiates between transducers with varying levels of performance. Two further parameters were also derived from the resolution integral: characteristic resolution and depth of field. We demonstrate that these two parameters can successfully characterize individual transducer performance and differentiate between transducers designed for different clinical and preclinical applications. In conclusion, the resolution integral is an effective metric to quantify and monitor grayscale imaging performance in clinical practice.

scholarly journals Impact of Aperture, Depth, and Acoustic Clutter on the Performance of Coherent Multi-Transducer Ultrasound Imaging

2020 ◽  
Vol 10 (21) ◽  
pp. 7655
Author(s):  
Laura Peralta ◽  
Alessandro Ramalli ◽  
Michael Reinwald ◽  
Robert J. Eckersley ◽  
Joseph V. Hajnal
Keyword(s):  
Image Quality ◽  
Ultrasound Imaging ◽  
Imaging System ◽  
Spatial Location ◽  
Single Probe ◽  
Deep Imaging ◽  
Effective Aperture ◽  
Imaging Performance ◽  
Image Performance ◽  
Higher Sensitivity

Transducers with a larger aperture size are desirable in ultrasound imaging to improve resolution and image quality. A coherent multi-transducer ultrasound imaging system (CoMTUS) enables an extended effective aperture through the coherent combination of multiple transducers. In this study, the discontinuous extended aperture created by CoMTUS and its performance for deep imaging and through layered media are investigated by both simulations and experiments. Typical image quality metrics—resolution, contrast and contrast-to-noise ratio—are evaluated and compared with a standard single probe imaging system. Results suggest that the image performance of CoMTUS depends on the relative spatial location of the arrays. The resulting effective aperture significantly improves resolution, while the separation between the arrays may degrade contrast. For a limited gap in the effective aperture (less than a few centimetres), CoMTUS provides benefits to image quality compared to the standard single probe imaging system. Overall, CoMTUS shows higher sensitivity and reduced loss of resolution with imaging depth. In general, CoMTUS imaging performance was unaffected when imaging through a layered medium with different speed of sound values and resolution improved up to 80% at large imaging depths.

scholarly journals Piezocomposite transducer design and performance for high resolution ultrasound imaging transducers

2019 ◽  
Vol 08 (03) ◽  
pp. 1950013 ◽  
Author(s):  
F. L. Hanse Wampo ◽  
R. P. Lemanle Sanga ◽  
P. Maréchal ◽  
G. E. Ntamack
Keyword(s):  
Ultrasound Imaging ◽  
Analytical Models ◽  
Experimental Measurements ◽  
Electromechanical Properties ◽  
Trade Off ◽  
New Material ◽  
Transducer Design ◽  
And Performance ◽  
Imaging Performance ◽  
Analytical Homogenization

Piezocomposite design for dedicated ultrasonic imaging applications requires precise homogenization models for predicting the electromechanical characteristics of the new material. Thus, several homogenization models have been developed. As part of this work, we applied several analytical homogenization models for piezocomposite of 2–2 and 1–3 connectivities. To validate these analytical models, a comparative study was made between various models and experimental measurements. As a result, these homogenized electromechanical properties are effectively used for the calculation and comparison of electroacoustic response for typical transducers aimed at ultrasound imaging applications. An optimal design of transducer aimed at ultrasound imaging applications is proposed as a dedicated imaging performance index, elaborated through a trade-off between sensitivity and bandwidth.

scholarly journals Optical design and imaging performance testing of a 96-mm diameter femtosecond laser microsurgery probe

2011 ◽  
Vol 19 (11) ◽  
pp. 10536 ◽  
Author(s):  
Christopher L. Hoy ◽  
Onur Ferhanoğlu ◽  
Murat Yildirim ◽  
Wibool Piyawattanametha ◽  
Hyejun Ra ◽  
...  
Keyword(s):  
Femtosecond Laser ◽  
Optical Design ◽  
Performance Testing ◽  
Laser Microsurgery ◽  
Imaging Performance

Improved Ultrasound Imaging Performance with Complex Cumulant Analysis

2022 ◽  
pp. 1-1
Author(s):  
Xin Liu ◽  
Boyi Li ◽  
Bo Pang ◽  
Chengcheng Liu ◽  
Yuexia Shu ◽  
...  
Keyword(s):  
Ultrasound Imaging ◽  
Cumulant Analysis ◽  
Imaging Performance

Bright-Field Images (Ctem) of Phase Objects at High Resolution

1976 ◽  
Vol 34 ◽  
pp. 490-491 ◽  
Author(s):  
Sumio Iijima
Keyword(s):  
High Resolution ◽  
Electron Beam Irradiation ◽  
Fine Particles ◽  
High Resolution Electron Microscopy ◽  
Good Test ◽  
Resolution Electron ◽  
Single Crystal Films ◽  
Crystal Films ◽  
By Products ◽  
Test Objects

We have developed a technique to prepare thin single crystal films of graphite for use as supporting films for high resolution electron microscopy. As we showed elsewhere (1), these films are completely noiseless and therefore can be used in the observation of phase objects by CTEM, such as single atoms or molecules as a means for overcoming the difficulties because of the background noise which appears with amorphous carbon supporting films, even though they are prepared so as to be less than 20Å thick. Since the graphite films are thinned by reaction with WO3 crystals under electron beam irradiation in the microscope, some small crystallites of WC or WC2 are inevitably left on the films as by-products. These particles are usually found to be over 10-20Å diameter but very fine particles are also formed on the film and these can serve as good test objects for studying the image formation of phase objects.

The influence of confocal microscope design on imaging performance

1993 ◽  
Vol 51 ◽  
pp. 144-145
Author(s):  
C J R Sheppard
Keyword(s):  
Image Quality ◽  
Fluorescence Imaging ◽  
Confocal Microscope ◽  
Industrial Applications ◽  
Three Dimensions ◽  
Design Parameters ◽  
Weak Signals ◽  
Size And Shape ◽  
Imaging Performance ◽  
Fundamental Limitation

The confocal microscope is now widely used in both biomedical and industrial applications for imaging, in three dimensions, objects with appreciable depth. There are now a range of different microscopes on the market, which have adopted a variety of different designs. The aim of this paper is to explore the effects on imaging performance of design parameters including the method of scanning, the type of detector, and the size and shape of the confocal aperture.It is becoming apparent that there is no such thing as an ideal confocal microscope: all systems have limitations and the best compromise depends on what the microscope is used for and how it is used. The most important compromise at present is between image quality and speed of scanning, which is particularly apparent when imaging with very weak signals. If great speed is not of importance, then the fundamental limitation for fluorescence imaging is the detection of sufficient numbers of photons before the fluorochrome bleaches.

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