Continuous wave ultrasonic Doppler tomography

Liang, Haidong; Tsui, Chun Sing Louis; Halliwell, Michael; Wells, P.N.T.

doi:10.1098/rsfs.2011.0018

Cited by 6 publications

(3 citation statements)

References 25 publications

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“…As a result, the spectrum resolution for a single angle θ is equal to ∆f = 784 Hz. Due to the diameter of the imaging zone, the maximum Doppler frequency in this case is equal to f d max = 3984 Hz based on the formula (2). From this it follows that only 11 Doppler bands can be determined in this case.…”

Section: Basic Problems Of Dt Image Reconstructionmentioning

confidence: 97%

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Archives of Acoustics

Świetlik

Opieliński

2020

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The paper describes an innovative ultrasound imaging method called Doppler Tomography (DT), otherwise known as Continuous Wave Ultrasonic Tomography (CWUT). Thanks to this method, it is possible to image the tissue cross-section in vivo using a simple two-transducer ultrasonic probe and using the Doppler effect. It should be noted that DT significantly differs from the conventional ultrasound Doppler method of measuring blood flow velocity. The main difference is that when measuring blood flow, we receive information with an image of the velocity distribution in a given blood vessel (Nowicki, 1995), while DT allows us to obtain a cross-sectional image of stationary tissue structure. In the conventional method, the probe remains stationary, while in the DT method, the probe moves and the examined tissue remains stationary.This paper presents a method of image reconstruction using the DT method. First, the basic principle of correlation of generated Doppler frequencies with the location of inclusions from which they originate is explained. Then the exact process and algorithm in this method are presented. Finally, the impact of several key parameters on imaging quality is examined. As a result, the conclusions of the research allow to improve the image reconstruction process using the DT method.

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Section: Basic Problems Of Dt Image Reconstructionmentioning

confidence: 97%

“…Two types of geometry can be distinguished in which the ultrasonic probe can move (Liang et al, 2001;2011). It is worth noting that in both cases, the examined tissue as well as the moving probe are immersed in distilled water.…”

Section: Introductionmentioning

confidence: 99%

Archives of Acoustics

Świetlik

Opieliński

2020

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“…The second category consists of papers on technologies that are just now beginning to impact upon clinical practice: real-time quasi-static ultrasound elastography [12], acoustic radiation force-based elasticity imaging [13] and ultrasonic image analysis and image-guided interventions [14]. The third category consists of papers that discuss contemporary research, which is either not directly concerned with clinical studies (micro-ultrasound for preclinical imaging [15]), or which, although promising, is still seen as being some time away from having an impact: biomedical photoacoustic imaging [16], ultrasound-mediated optical tomography [17], continuous wave ultrasonic Doppler tomography [18] and thermal strain imaging [19]. Since the perceived safety of ultrasonic imaging is often cited as being one of its advantages over most other modalities, there is a paper in the final category that puts this into perspective: ultrasonic imaging: safety considerations [20].…”

Section: Introductionmentioning

confidence: 99%

Recent advances in biomedical ultrasonic imaging techniques

2011

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Nowadays in the UK, more than one quarter of all clinical imaging procedures use ultrasound and the number of ultrasonic scans that are performed each year exceeds all of those done by X-ray computed tomography, magnetic resonance imaging and radionuclide scanning combined [1]. Doubtless, the situation is similar in the rest of the world, but with ultrasound being even more used in lessdeveloped countries, because of its relatively low cost. Diagnostic ultrasound has come into its ascendency over the last 60 years, mutating from a laboratory curiosity being developed and promoted by very few innovative engineers and visionary clinicians (for instance, in the USA [2], in Japan (see [3]), in Sweden [4] and in the UK [5]) into an indispensible tool in modern routine clinical practice.Each of the wide range of different imaging modalities has its own individual characteristics. Usually in practice, the choice of the optimal modality is fairly obvious, because it depends on the clinical problem being investigated. Thus, for example, an X-ray is appropriate if a fracture is suspected, because X-rays are good at imaging bones. Likewise, for the management of cancer, positron emission tomography-a type of radionuclide scanning-can be invaluable because of its ability to visualize malignant tissue. The relative advantage of any particular modality lies essentially in the mechanism of the contrast in the images which it produces. In this respect, ultrasonic imaging is rather versatile. Primarily, the image contrast depends on differences in densities and speeds of sound, because these properties determine the scattering and reflectivity of tissue. In addition, flow, motion, strain and elasticity can be estimated ultrasonically and used to produce parametric images, for example, by colour maps superimposed on images of scattering and reflectivity. Moreover, ultrasonic imaging is fast and apparently safe, as well as being well liked by patients. Thus, the technology is particularly valuable in clinical practice in obstetrics and gynaecology, internal medicine, genitourinary studies, cardiology, vascular studies, dermatology and breast disease, but it is not of much use in the investigation of gas-containing or bony structures.Ultrasonic imaging is a mature medical technology, the evolution of which has been the result of many years of biomedical engineering and clinical research. Moreover, the level of contemporary research activity is great and it covers a vast range of emerging opportunities. Very many ultrasound papers appear in medical journals devoted to the various clinical specialties and these generally report on the expansion of the diagnostic horizons, which results from novel applications and observations with existingalbeit often new-technologies. In organizing this Theme Issue of Interface Focus, however, we sought to compile papers that would be representative of advances in the technologies themselves, sometimes even before their clinical potentials have been explored. Of course, our intention certainly was ...

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Analysis of the Possibility of Doppler Tomography Imaging in Circular Geometry

Świetlik

Opieliński

2018

Advances in Intelligent Systems and Computing

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Continuous wave ultrasonic Doppler tomography

Cited by 6 publications

References 25 publications

Archives of Acoustics

Archives of Acoustics

Recent advances in biomedical ultrasonic imaging techniques

Analysis of the Possibility of Doppler Tomography Imaging in Circular Geometry

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