SPIE Medical Imaging最新文献_第10页

Ultrasound perfusion signal processing for tumor detection 超声灌注信号处理用于肿瘤检测

SPIE Medical Imaging Pub Date : 2016-04-01 DOI: 10.1117/12.2214345

MinWoo Kim, C. Abbey, M. Insana

引用次数: 0

Towards predictive diagnosis and management of rotator cuff disease: using curvelet transform for edge detection and segmentation of tissue 对肩袖疾病的预测诊断和治疗:使用曲波变换进行边缘检测和组织分割

SPIE Medical Imaging Pub Date : 2016-04-01 DOI: 10.1117/12.2217125

Vipul Pai Raikar, D. Kwartowitz

{"title":"Towards predictive diagnosis and management of rotator cuff disease: using curvelet transform for edge detection and segmentation of tissue","authors":"Vipul Pai Raikar, D. Kwartowitz","doi":"10.1117/12.2217125","DOIUrl":"https://doi.org/10.1117/12.2217125","url":null,"abstract":"Degradation and injury of the rotator cuff is one of the most common diseases of the shoulder among the general population. In orthopedic injuries, rotator cuff disease is only second to back pain in terms of overall reduced quality of life for patients. Clinically, this disease is managed via pain and activity assessment and diagnostic imaging using ultrasound and MRI. Ultrasound has been shown to have good accuracy for identification and measurement of rotator cuff tears. In our previous work, we have developed novel, real-time techniques to biomechanically assess the condition of the rotator cuff based on Musculoskeletal Ultrasound. Of the rotator cuff tissues, supraspinatus is the first that sees degradation and is the most commonly affected. In our work, one of the challenges lies in effectively segmenting and characterizing the supraspinatus. We are exploring the possibility of using curvelet transform for improving techniques to segment tissue in ultrasound. Curvelets have been shown to give optimal multi-scale representation of edges in images. They are designed to represent edges and singularities along curves in images which makes them an attractive proposition for use in ultrasound segmentation. In this work, we present a novel approach to the possibility of using curvelet transforms for automatic edge and feature extraction for the supraspinatus.","PeriodicalId":228011,"journal":{"name":"SPIE Medical Imaging","volume":"34 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2016-04-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"133063254","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: 3

In vivo small animal lung speckle imaging with a benchtop in-line XPC system 台式联机XPC系统在体内小动物肺斑点成像

SPIE Medical Imaging Pub Date : 2016-04-01 DOI: 10.1117/12.2217267

A. Garson, S. Gunsten, S. Vasireddi, S. Brody, M. Anastasio

引用次数: 0

Sub-mSV breast XACT scanner: concept and design 低于msv乳房XACT扫描仪:概念和设计

SPIE Medical Imaging Pub Date : 2016-04-01 DOI: 10.1117/12.2211079

Shanshan Tang, L. Ren, Pratik Samant, Jian Chen, Hong Liu, L. Xiang

{"title":"Sub-mSV breast XACT scanner: concept and design","authors":"Shanshan Tang, L. Ren, Pratik Samant, Jian Chen, Hong Liu, L. Xiang","doi":"10.1117/12.2211079","DOIUrl":"https://doi.org/10.1117/12.2211079","url":null,"abstract":"Excessive exposure to radiation increases the risk of cancer. We present the concept and design of a new imaging paradigm, X-ray induced acoustic computed tomography (XACT). Applying this innovative technology to breast imaging, one single X-ray exposure can generate a 3D acoustic image, which dramatically reduces the radiation dose to patients when compared to beast CT. A theoretical model is developed to analyze the sensitivity of XACT. A noise equivalent pressure model is used for calculating the minimal radiation dose in XACT imaging. Furthermore, K-Wave simulation is employed to study the acoustic wave propagation in breast tissue. Theoretical analysis shows that the X-ray induced acoustic signal has a 100% relative sensitivity to the X-ray absorption (given that the percentage change in the X-ray absorption coefficient yields the same percentage change in the acoustic signal amplitude), but not to X-ray scattering. The final detection sensitivity is primarily limited by the thermal noise. The radiation dose can be reduced by a factor of 100 compared with the newly FDA approved breast CT. Reconstruction result shows that breast calcification with diameter of 80 μm can be observed in XACT image by using ultrasound transducers with 5.5 MHz center frequency. Therefore, with the proposed innovative technology, one can potentially reduce radiation dose to patient in breast imaging as compared with current x-ray modalities.","PeriodicalId":228011,"journal":{"name":"SPIE Medical Imaging","volume":"539 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2016-04-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"116592099","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: 3

Scattering-compensated cone beam x-ray luminescence computed tomography 散射补偿锥束x射线发光计算机断层扫描

SPIE Medical Imaging Pub Date : 2016-04-01 DOI: 10.1117/12.2214919

Peng Gao, Junyan Rong, Huangsheng Pu, Wenlei Liu, Qimei Liao, Hongbing Lu

引用次数: 0

An evolutionary Bayesian search scheme for ultrasound modulated optical tomography 超声调制光学层析成像的进化贝叶斯搜索方案

SPIE Medical Imaging Pub Date : 2016-04-01 DOI: 10.1117/12.2214730

M. Venugopal, D. Roy, R. Vasu

{"title":"An evolutionary Bayesian search scheme for ultrasound modulated optical tomography","authors":"M. Venugopal, D. Roy, R. Vasu","doi":"10.1117/12.2214730","DOIUrl":"https://doi.org/10.1117/12.2214730","url":null,"abstract":"Ultrasound modulated optical tomography (UMOT) combines high optical contrast with high ultrasound resolution to image soft tissues. A focused ultrasound beam introduced to a specific region of interest (ROI) in the object modulates the mean position of the scattering centers locally. This in turn modulates the overall decay of the specific intensity of an incident coherent light beam as it passes through the insonified region. The inverse problem of UMOT aims to recover the mean-squared displacements of the scattering centers from the measured amplitude autocorrelation of light. We propose an evolutionary Bayesian search scheme to invert the measurements through repeated solves of the correlation diffusion equation so as to drive the resultant measurement-prediction misfit to a zero-mean Brownian process. The discretized parameter vector evolves as a stochastic process with respect to an iteration variable and follows a recursive prediction-update algorithm. The conventional multiplicative-weight-based Bayesian update schemes suffer from sample degeneracy and are consequently ill-equipped to solve large dimensional problems in imaging. The key idea of this work is to incorporate a derivative-free additive correction to the predicted parameter process via a gain term that is functionally analogous to the weights. The numerical results for simulated data indicate that the proposed scheme substantively improves the reconstruction accuracy vis-à-vis a popularly adopted regularized Gauss-Newton approach. The advantage of a derivative-free scheme is particularly highlighted in cases characterized by low sensitivity of measurements to variations in the parameters. Moreover, the proposed scheme circumvents the tedious Jacobian calculations involved in a Gauss-Newton approach.","PeriodicalId":228011,"journal":{"name":"SPIE Medical Imaging","volume":"67 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2016-04-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"132947792","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: 0

Analog gradient beamformer for a wireless ultrasound scanner 用于无线超声扫描仪的模拟梯度波束形成器

SPIE Medical Imaging Pub Date : 2016-04-01 DOI: 10.1117/12.2216238

Tommaso Di Ianni, M. Hemmsen, J. Bagge, H. Jensen, N. Vardi, J. Jensen

{"title":"Analog gradient beamformer for a wireless ultrasound scanner","authors":"Tommaso Di Ianni, M. Hemmsen, J. Bagge, H. Jensen, N. Vardi, J. Jensen","doi":"10.1117/12.2216238","DOIUrl":"https://doi.org/10.1117/12.2216238","url":null,"abstract":"This paper presents a novel beamformer architecture for a low-cost receiver front-end, and investigates if the image quality can be maintained. The system is oriented to the development of a hand-held wireless ultrasound probe based on Synthetic Aperture Sequential Beamforming, and has the advantage of effectively reducing circuit complexity and power dissipation. The array of transducers is divided into sub-apertures, in which the signals from the single channels are aligned through a network of cascaded gradient delays, and summed in the analog domain before A/D conversion. The delay values are quantized to simplify the shifting unit, and a single A/D converter is needed for each sub-aperture yielding a compact, low-power architecture that can be integrated in a single chip. A simulation study was performed using a 3:75MHz convex array, and the point spread function (PSF) for different configurations was evaluated in terms of lateral full-width-at-half-maximum (FWHM) and −20 dB cystic resolution (CR). Several setups were simulated varying the sub-aperture size N and the quantization step, and design constraints were obtained comparing the PSF to that of an ideal non-quantized system. The PSF is shown for N = 32 with a quantization step of 12 ns. For this configuration, the FWHM is degraded by 0.25% and the CR is 8.70% lower compared to the ideal situation. The results demonstrate that the gradient beamformer provides an adequate image quality, and open the way to a fully-integrated chip for a compact, low-cost, wireless ultrasound probe.","PeriodicalId":228011,"journal":{"name":"SPIE Medical Imaging","volume":"5 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2016-04-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"121995225","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: 5

Dynamic programming on a tree for ultrasound elastography 基于树的超声弹性成像动态规划

SPIE Medical Imaging Pub Date : 2016-04-01 DOI: 10.1117/12.2217345

R. Shams, M. Boily, P. Martineau, H. Rivaz

引用次数: 1

Novel automatic detection of pleura and B-lines (comet-tail artifacts) on in vivo lung ultrasound scans 新的自动检测胸膜和b线(彗星尾伪影)在体内肺超声扫描

SPIE Medical Imaging Pub Date : 2016-04-01 DOI: 10.1117/12.2216499

Ramin Moshavegh, K. Hansen, Hasse Møller Sørensen, M. Hemmsen, C. Ewertsen, M. Nielsen, J. Jensen

{"title":"Novel automatic detection of pleura and B-lines (comet-tail artifacts) on in vivo lung ultrasound scans","authors":"Ramin Moshavegh, K. Hansen, Hasse Møller Sørensen, M. Hemmsen, C. Ewertsen, M. Nielsen, J. Jensen","doi":"10.1117/12.2216499","DOIUrl":"https://doi.org/10.1117/12.2216499","url":null,"abstract":"This paper presents a novel automatic method for detection of B-lines (comet-tail artifacts) in lung ultrasound scans. B-lines are the most commonly used artifacts for analyzing the pulmonary edema. They appear as laser-like vertical beams, which arise from the pleural line and spread down without fading to the edge of the screen. An increase in their number is associated with presence of edema. All the scans used in this study were acquired using a BK3000 ultrasound scanner (BK Ultrasound, Denmark) driving a 192-element 5:5 MHz wide linear transducer (10L2W, BK Ultrasound). The dynamic received focus technique was employed to generate the sequences. Six subjects, among those three patients after major surgery and three normal subjects, were scanned once and Six ultrasound sequences each containing 50 frames were acquired. The proposed algorithm was applied to all 300 in-vivo lung ultrasound images. The pleural line is first segmented on each image and then the B-line artifacts spreading down from the pleural line are detected and overlayed on the image. The resulting 300 images showed that the mean lateral distance between B-lines detected on images acquired from patients decreased by 20% in compare with that of normal subjects. Therefore, the method can be used as the basis of a method of automatically and qualitatively characterizing the distribution of B-lines.","PeriodicalId":228011,"journal":{"name":"SPIE Medical Imaging","volume":"115 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2016-04-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"132072642","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: 19

Single element ultrasonic imaging of limb geometry: an in-vivo study with comparison to MRI 肢体几何的单元素超声成像:与MRI比较的体内研究

SPIE Medical Imaging Pub Date : 2016-04-01 DOI: 10.1117/12.2216542

Xiang Zhang, J. Fincke, B. Anthony

{"title":"Single element ultrasonic imaging of limb geometry: an in-vivo study with comparison to MRI","authors":"Xiang Zhang, J. Fincke, B. Anthony","doi":"10.1117/12.2216542","DOIUrl":"https://doi.org/10.1117/12.2216542","url":null,"abstract":"Despite advancements in medical imaging, current prosthetic fitting methods remain subjective, operator dependent, and non-repeatable. The standard plaster casting method relies on prosthetist experience and tactile feel of the limb to design the prosthetic socket. Often times, many fitting iterations are required to achieve an acceptable fit. Use of improper socket fittings can lead to painful pathologies including neuromas, inflammation, soft tissue calcification, and pressure sores, often forcing the wearer to into a wheelchair and reducing mobility and quality of life. Computer software along with MRI/CT imaging has already been explored to aid the socket design process. In this paper, we explore the use of ultrasound instead of MRI/CT to accurately obtain the underlying limb geometry to assist the prosthetic socket design process. Using a single element ultrasound system, multiple subjects' proximal limbs were imaged using 1, 2.25, and 5 MHz single element transducers. Each ultrasound transducer was calibrated to ensure acoustic exposure within the limits defined by the FDA. To validate image quality, each patient was also imaged in an MRI. Fiducial markers visible in both MRI and ultrasound were used to compare the same limb cross-sectional image for each patient. After applying a migration algorithm, B-mode ultrasound cross-sections showed sufficiently high image resolution to characterize the skin and bone boundaries along with the underlying tissue structures.","PeriodicalId":228011,"journal":{"name":"SPIE Medical Imaging","volume":"165 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2016-04-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"123385397","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: 7