2014 IEEE International Ultrasonics Symposium最新文献_第9页

Design of a fatty plaque phantom for validation of strain imaging 用于应变成像验证的脂肪斑块模体设计

2014 IEEE International Ultrasonics Symposium Pub Date : 2014-10-23 DOI: 10.1109/ULTSYM.2014.0654

R. W. Boekhoven, M. Rutten, F. N. van de Vosse, R. Lopata

{"title":"Design of a fatty plaque phantom for validation of strain imaging","authors":"R. W. Boekhoven, M. Rutten, F. N. van de Vosse, R. Lopata","doi":"10.1109/ULTSYM.2014.0654","DOIUrl":"https://doi.org/10.1109/ULTSYM.2014.0654","url":null,"abstract":"Prior to clinical application of novel techniques such as vascular elastography and photo acoustic imaging, validation studies are of great importance. Gelatin, agar and polyvinyl-alcohol (PVA) phantoms are commonly used. However, more realistic phantoms are needed with complex geometry and different constituents with known properties. For this purpose, a fatty plaque phantom (fPP) was designed. A 15 weight percent (wt%) PVA solution was made, and 1 wt% of silica scatters were added (3 8 nm). The solution was poured in to a custom made mold, acquiring the fPP in four freeze/thaw cycles. B-mode data were acquired using a MyLab70 (Esaote, NL), while being pressurized from 0-80 mmHg. The phantom was imaged using a 3D echo-CT strain imaging method [1], [2], to determine 3D geometry, distension and radial strains. In accordance with the distension data, higher radial strains were found at the lipid inclusion location. In future work, strain data will be compared to numerical models that match the phantoms and experimental conditions to validate the strains measured. Additional stiffening of the PVA using a coagulation bath will be explored, by doing so, increasing the systolic pressure allowed.","PeriodicalId":153901,"journal":{"name":"2014 IEEE International Ultrasonics Symposium","volume":"56 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2014-10-23","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"126631154","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 4

In vivo radial and longitudinal carotid artery plaque strain estimation via ultrasound-based speckle tracking 基于超声斑点跟踪的体内颈动脉径向和纵向斑块应变估计

2014 IEEE International Ultrasonics Symposium Pub Date : 2014-10-23 DOI: 10.1109/ULTSYM.2014.0129

E. Widman, K. Caidahl, M. Larsson

引用次数: 0

Effects of FBAR resonator dissipated power on discrete oscillator phase noise FBAR谐振腔耗散功率对离散振荡器相位噪声的影响

2014 IEEE International Ultrasonics Symposium Pub Date : 2014-10-23 DOI: 10.1109/ULTSYM.2014.0024

R. Parker, L. Callaghan, F. Bi, S. Ortiz, Frank Ha, N. Kumbhat, Jeff LaTourrette, M. Unkrich, Choon Chowe Chen, G. Ong

引用次数: 2

RF-based motion estimation using non-rigid image registration techniques: In-silico and in-vivo feasibility 使用非刚性图像配准技术的基于射频的运动估计:在硅和体内的可行性

2014 IEEE International Ultrasonics Symposium Pub Date : 2014-10-23 DOI: 10.1109/ULTSYM.2014.0568

B. Heyde, M. Alessandrini, L. Tong, J. D’hooge

{"title":"RF-based motion estimation using non-rigid image registration techniques: In-silico and in-vivo feasibility","authors":"B. Heyde, M. Alessandrini, L. Tong, J. D’hooge","doi":"10.1109/ULTSYM.2014.0568","DOIUrl":"https://doi.org/10.1109/ULTSYM.2014.0568","url":null,"abstract":"US deformation techniques can roughly be divided in block matching (BM) and non-rigid image registration (NRIR). Motion can be extracted from the radio-frequency (RF) signals, from their envelope, or from the B-mode data. RF-based BM is known to outperform B-mode tracking in a small displacement setting, whereas NRIR has only been applied to B-mode data. The aim of this study was to test the feasibility of RF-based NRIR in-silico and in-vivo. First, synthetic 2D images of a phantom with a soft inclusion undergoing an axial compression (0.25%) were simulated. Its performance was assessed by varying the inclusion thickness (range: 2-20 mm in 2 mm steps) and stiffness (resulting strain range: 0.50%-1.50% in 0.25% steps). Both RF and envelope tracking were better at identifying smaller and more subtle inclusions compared to B-mode tracking (down to 8 mm and 6 mm resp.). Furthermore, when tracking the RF instead of their envelope, inclusion borders were more sharply defined (border size 2.57 mm vs 4.88 mm, p<;0.001) and strain errors in the inclusion were lower (0.08% vs 0.10%; p<;0.05). Next, NRIR was used to track the septum of a healthy volunteer from high frame rate US recordings (436 Hz), and compared against a recent RF-based BM method. In-vivo tracking revealed that RF-based BM and RF-based NRIR performed similarly, both producing physiological axial velocity and strain curves. The lateral components could only be estimated using NRIR.","PeriodicalId":153901,"journal":{"name":"2014 IEEE International Ultrasonics Symposium","volume":"15 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2014-10-23","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"122257040","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 2

Accuracy and sources of error for an angle independent volume flow estimator 不依赖角度的容积流量估计器的精度和误差来源

2014 IEEE International Ultrasonics Symposium Pub Date : 2014-10-23 DOI: 10.1109/ULTSYM.2014.0425

Jonas Jensen, J. B. Olesen, P. Hansen, M. Nielsen, J. Jensen

{"title":"Accuracy and sources of error for an angle independent volume flow estimator","authors":"Jonas Jensen, J. B. Olesen, P. Hansen, M. Nielsen, J. Jensen","doi":"10.1109/ULTSYM.2014.0425","DOIUrl":"https://doi.org/10.1109/ULTSYM.2014.0425","url":null,"abstract":"This paper investigates sources of error for a vector velocity volume flow estimator. Quantification of the estimator's accuracy is performed theoretically and investigated in vivo. Womersley's model for pulsatile flow is used to simulate velocity profiles and calculate volume flow errors in cases of elliptical vessels and not placing the transducer at the vessel center. Simulations show, i.e., that volume flow is underestimated with 5 %, when the transducer is placed 15 % from the vessel center. Twenty patients with arteriovenous fistulas for hemodialysis are scanned in a clinical study. A BK Medical UltraView 800 ultrasound scanner with a 9 MHz linear array transducer is used to obtain Vector Flow Imaging sequences of a superficial part of the fistulas. Cross-sectional diameters of each fistula are measured on B-mode images by rotating the scan plane 90 degrees. The major axis of the fistulas was on average 8.6 % larger than the minor axis, so elliptic dimensions should be taken into account in volume flow estimation. The ultrasound beam was on average 1.5 ± 0.8 mm off-axis, corresponding to 28.5 ± 11.3 % of the major semi-axis of a fistula, and this could result in 15 % underestimated volume flow according to the simulation. Volume flow estimates were corrected for the beam being off-axis, but was not able to significantly decrease the error relative to measurements with the reference method.","PeriodicalId":153901,"journal":{"name":"2014 IEEE International Ultrasonics Symposium","volume":"14 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2014-10-23","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"116047275","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 6

A mechanism of ultrasound balloon rupture for fetal surgery 胎儿手术超声球囊破裂的机制

2014 IEEE International Ultrasonics Symposium Pub Date : 2014-10-23 DOI: 10.1109/ULTSYM.2014.0539

Tomoo Sato, S. Osawa, H. Yamashita, H. Ohtake, J. Yonai, Hiroyasu Sasaki, T. Mochizuki, T. Chiba

引用次数: 0

Liver elasticity imaging using external Vibration Multi-directional Ultrasound Shearwave Elastography (EVMUSE) 体外振动多向超声剪切波弹性成像(EVMUSE)

2014 IEEE International Ultrasonics Symposium Pub Date : 2014-10-23 DOI: 10.1109/ULTSYM.2014.0240

Heng Zhao, P. Song, Duane D. Meixner, R. Kinnick, M. Callstrom, William Sanchez, M. Urban, A. Manduca, J. Greenleaf, Shigao Chen

{"title":"Liver elasticity imaging using external Vibration Multi-directional Ultrasound Shearwave Elastography (EVMUSE)","authors":"Heng Zhao, P. Song, Duane D. Meixner, R. Kinnick, M. Callstrom, William Sanchez, M. Urban, A. Manduca, J. Greenleaf, Shigao Chen","doi":"10.1109/ULTSYM.2014.0240","DOIUrl":"https://doi.org/10.1109/ULTSYM.2014.0240","url":null,"abstract":"Shear wave speed can be used to assess tissue elasticity, which is associated with tissue health. Ultrasound shear wave elastography techniques based on measuring the propagation speed of the shear waves induced by acoustic radiation force are becoming promising alternatives to biopsy in liver fibrosis staging. However, shear waves generated by such methods are typically very weak. Therefore, the penetration may become problematic, especially for overweight or obese patients. In this study, we developed a new method called External Vibration Multi-directional Ultrasound Shearwave Elastography (EVMUSE), in which external vibration from a loudspeaker was used to generate a multi-directional shear wave field. A directional filter was then applied to separate the complex shear wave field into several shear wave fields propagating in different directions. A two-dimensional (2D) shear wave speed map was reconstructed from each individual shear wave field, and a final 2D shear wave speed map was constructed by compounding these individual wave speed maps. The method was validated using two homogeneous phantoms and one multi-purpose phantom. Ten patients undergoing liver Magnetic Resonance Elastography (MRE) were also studied with EVMUSE to compare results between the two methods. Phantom results showed EVMUSE was able to quantify tissue elasticity accurately with good penetration. In vivo EVMUSE results were well correlated with MRE results, indicating the promise of using EVMUSE for liver fibrosis staging.","PeriodicalId":153901,"journal":{"name":"2014 IEEE International Ultrasonics Symposium","volume":"1 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2014-10-23","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"130127297","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 1

Elastic modulus contrast enhancement in shear wave imaging using mechanical nonlinearity: In vitro tissue mimicking phantom study 弹性模量增强剪切波成像使用力学非线性:体外组织模拟幻影研究

2014 IEEE International Ultrasonics Symposium Pub Date : 2014-10-23 DOI: 10.1109/ULTSYM.2014.0582

D. Park, Kang Kim

{"title":"Elastic modulus contrast enhancement in shear wave imaging using mechanical nonlinearity: In vitro tissue mimicking phantom study","authors":"D. Park, Kang Kim","doi":"10.1109/ULTSYM.2014.0582","DOIUrl":"https://doi.org/10.1109/ULTSYM.2014.0582","url":null,"abstract":"Shear wave elasticity imaging (SWEI) has been widely used to assess the elasticity of tissues. However, the shear modulus estimated in SWEI is often less sensitive in some cases, especially to a subtle change of the stiffness that produces only small mechanical contrast to the background tissues. This small mechanical contrast can be enhanced if the tissues are compressed, exhibiting mechanical nonlinearity. In this study, we propose a new approach of nonlinear SWEI and evaluate its feasibility through experiments using a tissue mimicking phantom. SWEI was performed while a tissue mimicking phantom was continually deformed over a relatively large dynamic range of strains. A 1.5% agar mixed with 5% gelatin inclusion of a long cylinder (D: 8 mm, hard) embedded in 0.5% agar mixed with 5% gelatin phantom block (soft) was fabricated. The average shear modulus of the inclusion exhibited noticeable nonlinearity after >10% overall applied strain and sharply increased to 40 kPa at 30% overall applied strain. On the other hand, the average shear modulus of the surrounding phantom block increased almost linearly from 4 to 16 kPa over the same applied strain range. The elastic modulus contrast of the inclusion to the surrounding phantom block was increased from 0.40 at 0% overall applied strain to 1.52 at 30% applied strain, which displays detecting the inclusion better.","PeriodicalId":153901,"journal":{"name":"2014 IEEE International Ultrasonics Symposium","volume":"21 10","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2014-10-23","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"114000559","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 1

Speckle decorrelation of motion in Ultrasound Fourier images 超声傅里叶图像中运动的散斑去相关

2014 IEEE International Ultrasonics Symposium Pub Date : 2014-10-23 DOI: 10.1109/ULTSYM.2014.0296

Miaomiao Zhang, H. Liebgott, F. Varray, D. Friboulet, O. Bernard

引用次数: 0

Adapting amplitude modulation to plane-wave non-linear Doppler imaging 平面波非线性多普勒成像的调幅适应

2014 IEEE International Ultrasonics Symposium Pub Date : 2014-10-23 DOI: 10.1109/ULTSYM.2014.0432

C. Tremblay-Darveau, Ross Williams, Ze Zhang, L. Milot, M. Bruce, P. Burns

引用次数: 7