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You searched for subject:(Elasticity imaging techniques). Showing records 1 – 3 of 3 total matches.

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University of Michigan

1. Lubinski, Mark Alexander. Speckle tracking techniques for ultrasound elasticity imaging.

Degree: PhD, Medical imaging, 1998, University of Michigan

The fundamental goal of elasticity imaging is to detect changes in soft tissue elasticity which are related to pathological processes. To reconstruct images of elastic modulus deep within the body, mechanical displacement and strain fields must be measured. Using controlled deformations at the body surface and ultrasound imaging, the motion of the tissue can be estimated using speckle tracking algorithms. Traditional ultrasound tracking methods are examined and new methods are presented which account for the specific needs of elasticity imaging. In ultrasound elasticity imaging, strain decorrelation is a major source of error in displacements estimated using correlation techniques. This error can be significantly decreased by both reducing the correlation integration time and filtering the correlation functions prior to displacement estimation. High resolution, high signal-to-noise ratio (SNR) strain estimates can be computed using small correlation kernels (on the order of the correlation width of the ultrasound signal) and correlation filtering. Since errors in displacement and strain estimates depend on the magnitude of the induced strain, strain SNR will be a function of the applied deformation. By applying continuous deformation and capturing data in real-time, the surface displacement providing the highest strain SNR can be selected retrospectively. A method to adaptively optimize strain SNR over the image plane using retrospective processing is presented. Using the incompressibility property of soft tissue, lateral displacements can be reconstructed from axial strain measurements. Due to anisotropy in spatial frequencies, axial displacements are much more accurate than lateral ones. Incompressibility processing greatly improves the accuracy and SNR of lateral displacement measurements compared with more traditional speckle tracking. To test the accuracy and precision of these algorithms, experimental elasticity imaging systems were constructed to apply controlled deformations and collect ultrasound data. Results from simulations and experiments on gelatin phantoms are presented. The potential application of these methods to diagnose kidney transplant rejection is examined. Initial studies from gelatin phantoms with embedded ex vivo kidneys are presented, in which a cross-linking agent was used to modify kidney elasticity. The results suggest that ultrasound elasticity imaging is possible in complex structures such as the kidney using these speckle tracking techniques. Advisors/Committee Members: O'Donnell, Matthew (advisor).

Subjects/Keywords: Elasticity; Imaging; Speckle; Techniques; Tracking; Ultrasound

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APA · Chicago · MLA · Vancouver · CSE | Export to Zotero / EndNote / Reference Manager

APA (6th Edition):

Lubinski, M. A. (1998). Speckle tracking techniques for ultrasound elasticity imaging. (Doctoral Dissertation). University of Michigan. Retrieved from http://hdl.handle.net/2027.42/131040

Chicago Manual of Style (16th Edition):

Lubinski, Mark Alexander. “Speckle tracking techniques for ultrasound elasticity imaging.” 1998. Doctoral Dissertation, University of Michigan. Accessed January 22, 2021. http://hdl.handle.net/2027.42/131040.

MLA Handbook (7th Edition):

Lubinski, Mark Alexander. “Speckle tracking techniques for ultrasound elasticity imaging.” 1998. Web. 22 Jan 2021.

Vancouver:

Lubinski MA. Speckle tracking techniques for ultrasound elasticity imaging. [Internet] [Doctoral dissertation]. University of Michigan; 1998. [cited 2021 Jan 22]. Available from: http://hdl.handle.net/2027.42/131040.

Council of Science Editors:

Lubinski MA. Speckle tracking techniques for ultrasound elasticity imaging. [Doctoral Dissertation]. University of Michigan; 1998. Available from: http://hdl.handle.net/2027.42/131040


Universidade Estadual de Campinas

2. Mendes, Leandro César, 1984-. Performance diagnóstica da elastografia transitória para o estadiamento de fibrose e esteatose em pacientes com hepatite C crônica : Diagnostic performance of transient elastography for fibrosis and steatosis staging in chronic hepatitis C: Diagnostic performance of transient elastography for fibrosis and steatosis staging in chronic hepatitis C.

Degree: 2018, Universidade Estadual de Campinas

Abstract: Vibration controlled transient elastography (VCTE) is one of the most validated noninvasive test modalities for liver fibrosis staging and steatosis grading in chronic hepatitis C (CHC), however, diagnostic performance indicators may have been hampered by an imperfect gold standard. Considerable inter and intraobserver variability may hinder the accuracy for liver biopsy and, therefore, its comparators. Moreover, VCTE results are internally validated solely on the basis of variability and success rate and lack reproducible quality indicators. In this study we aimed to evaluate different aspects regarding diagnostic performance of VCTE and factors associated with accuracy. Adult patients with CHC were prospectively enrolled from an outpatient university hospital viral hepatitis clinic for consecutive liver biopsy and VCTE. Anthropomorphic, clinical and biochemical data were analysed along with technical factors for possible association with accuracy, including elastogram quality. Liver biopsies underwent both conventional histological examination by an experienced hepatopathologist and digital morphometric analysis. Controlled Attenuation Parameter results from VCTE measurements were recorded and studied in comparison with digital morphometric quantification in liver biopsy fragments and for possible association with elastogram quality. In a preliminary analysis, 182 adult patients with a median age of 55 years and median body mass index of 26.71 kg/m2 were analyzed. On conventional histological examination of LB, 56% of patients had significant levels of fibrosis... The abstract is available with the full electronic document Advisors/Committee Members: UNIVERSIDADE ESTADUAL DE CAMPINAS (CRUESP), Stucchi, Raquel Silveira Bello, 1958- (advisor), Vigani, Aline Gonzalez (coadvisor), Universidade Estadual de Campinas. Faculdade de Ciências Médicas (institution), Programa de Pós-Graduação em Clínica Médica (nameofprogram), Ferraz, Maria Lucia Cardoso Gomes (committee member), Carvalho Filho, Roberto José de (committee member), Sevá-Pereira, Tiago (committee member), Mazo, Daniel Ferraz de Campos (committee member).

Subjects/Keywords: Hepatite C; Técnicas de imagem por elasticidade; Fibrose; Fígado gorduroso; Diagnóstico; Hepatitis C; Elasticity imaging techniques; Fibrosis; Fatty liver; Diagnosis

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APA · Chicago · MLA · Vancouver · CSE | Export to Zotero / EndNote / Reference Manager

APA (6th Edition):

Mendes, Leandro César, 1. (2018). Performance diagnóstica da elastografia transitória para o estadiamento de fibrose e esteatose em pacientes com hepatite C crônica : Diagnostic performance of transient elastography for fibrosis and steatosis staging in chronic hepatitis C: Diagnostic performance of transient elastography for fibrosis and steatosis staging in chronic hepatitis C. (Thesis). Universidade Estadual de Campinas. Retrieved from http://repositorio.unicamp.br/jspui/handle/REPOSIP/332467

Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation

Chicago Manual of Style (16th Edition):

Mendes, Leandro César, 1984-. “Performance diagnóstica da elastografia transitória para o estadiamento de fibrose e esteatose em pacientes com hepatite C crônica : Diagnostic performance of transient elastography for fibrosis and steatosis staging in chronic hepatitis C: Diagnostic performance of transient elastography for fibrosis and steatosis staging in chronic hepatitis C.” 2018. Thesis, Universidade Estadual de Campinas. Accessed January 22, 2021. http://repositorio.unicamp.br/jspui/handle/REPOSIP/332467.

Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation

MLA Handbook (7th Edition):

Mendes, Leandro César, 1984-. “Performance diagnóstica da elastografia transitória para o estadiamento de fibrose e esteatose em pacientes com hepatite C crônica : Diagnostic performance of transient elastography for fibrosis and steatosis staging in chronic hepatitis C: Diagnostic performance of transient elastography for fibrosis and steatosis staging in chronic hepatitis C.” 2018. Web. 22 Jan 2021.

Vancouver:

Mendes, Leandro César 1. Performance diagnóstica da elastografia transitória para o estadiamento de fibrose e esteatose em pacientes com hepatite C crônica : Diagnostic performance of transient elastography for fibrosis and steatosis staging in chronic hepatitis C: Diagnostic performance of transient elastography for fibrosis and steatosis staging in chronic hepatitis C. [Internet] [Thesis]. Universidade Estadual de Campinas; 2018. [cited 2021 Jan 22]. Available from: http://repositorio.unicamp.br/jspui/handle/REPOSIP/332467.

Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation

Council of Science Editors:

Mendes, Leandro César 1. Performance diagnóstica da elastografia transitória para o estadiamento de fibrose e esteatose em pacientes com hepatite C crônica : Diagnostic performance of transient elastography for fibrosis and steatosis staging in chronic hepatitis C: Diagnostic performance of transient elastography for fibrosis and steatosis staging in chronic hepatitis C. [Thesis]. Universidade Estadual de Campinas; 2018. Available from: http://repositorio.unicamp.br/jspui/handle/REPOSIP/332467

Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation


Universidade Estadual de Campinas

3. Müller, Cristina Emöke Erika, 1978-. Pontos-gatilho e índice de resistência pela elastografia ultrassonográfica em adultos jovens com dor miofascial das regiões de cabeça, pescoço e ombros = Trigger points and ultrasound elastography strain ratio in young adults with head, neck and shoulder myofascial pain: Trigger points and ultrasound elastography strain ratio in young adults with head, neck and shoulder myofascial pain.

Degree: 2017, Universidade Estadual de Campinas

Abstract: Chronic soft tissue pain syndromes and myofascial pain are responsible for serious impact on function and disability, which are determined by the presence of myofascial trigger points (MTrP). Tension-type headache (TTH) is the most frequent headache in adults in often associated with MTrP of head and neck muscles. New features have been tested for MTrP complementary diagnosis, such as two-dimensional ultrasonography and ultrasound elastography (ELASTO). The aim of this study was to access clinical outcomes from young adults looking forward the frequency of MTrP and muscle tenderness related to pain complaints of myofascial origin on the head, neck and shoulders regions. An observational cross-section study was carried on, with the sample consisted of 15 men and 17 women, aged between 19 and 35 years (25.78±3.93), BMI of 18.07 to 29,98 Kg/m2 (23.00±3.22). Data were collected concerning general info, two-dimensional ultrasound, ELASTO strain ratio (SR), pain pressure threshold (PPT) trough digital algometer, pain intensity trough Visual Analogue Scale (VAS), manual palpation of MTrP and TTH classification. Women had statistically significant more pain in other parts of the body than men and higher pain intensity through VAS. PPT was significantly lower in active than latent MTrP group for both right and left trapezius. PPT in the left trapezius muscle were lower and concerning SR, statistically significant higher values were found in the active MTrP group, indicating that the most sensitive muscle presented the highest stiffness. Women with pain of myofascial origin felt it in greater intensity and associated with other parts of the body frequently than men. ELASTO and algometry were effective in greater muscle stiffness and lower PPT values identification in muscles with active MTrP Advisors/Committee Members: UNIVERSIDADE ESTADUAL DE CAMPINAS (CRUESP), Gavião, Maria Beatriz Duarte, 1955- (advisor), Universidade Estadual de Campinas. Faculdade de Odontologia de Piracicaba (institution), Programa de Pós-Graduação em Biologia Buco-Dental (nameofprogram), Pedroni, Cristiane Rodrigues (committee member), Corazza, Adalberto Vieira (committee member), Castelo, Paula Midori (committee member), Carvalho, Polliane Morais de (committee member).

Subjects/Keywords: Dor crônica; Pontos-gatilho; Síndromes da dor miofascial; Cefaleia do tipo tensional; Técnicas de imagem por elasticidade; Chronic pain; Trigger points; Myofascial pain syndromes; Tension-type headache; Elasticity imaging techniques

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APA · Chicago · MLA · Vancouver · CSE | Export to Zotero / EndNote / Reference Manager

APA (6th Edition):

Müller, Cristina Emöke Erika, 1. (2017). Pontos-gatilho e índice de resistência pela elastografia ultrassonográfica em adultos jovens com dor miofascial das regiões de cabeça, pescoço e ombros = Trigger points and ultrasound elastography strain ratio in young adults with head, neck and shoulder myofascial pain: Trigger points and ultrasound elastography strain ratio in young adults with head, neck and shoulder myofascial pain. (Thesis). Universidade Estadual de Campinas. Retrieved from http://repositorio.unicamp.br/jspui/handle/REPOSIP/330291

Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation

Chicago Manual of Style (16th Edition):

Müller, Cristina Emöke Erika, 1978-. “Pontos-gatilho e índice de resistência pela elastografia ultrassonográfica em adultos jovens com dor miofascial das regiões de cabeça, pescoço e ombros = Trigger points and ultrasound elastography strain ratio in young adults with head, neck and shoulder myofascial pain: Trigger points and ultrasound elastography strain ratio in young adults with head, neck and shoulder myofascial pain.” 2017. Thesis, Universidade Estadual de Campinas. Accessed January 22, 2021. http://repositorio.unicamp.br/jspui/handle/REPOSIP/330291.

Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation

MLA Handbook (7th Edition):

Müller, Cristina Emöke Erika, 1978-. “Pontos-gatilho e índice de resistência pela elastografia ultrassonográfica em adultos jovens com dor miofascial das regiões de cabeça, pescoço e ombros = Trigger points and ultrasound elastography strain ratio in young adults with head, neck and shoulder myofascial pain: Trigger points and ultrasound elastography strain ratio in young adults with head, neck and shoulder myofascial pain.” 2017. Web. 22 Jan 2021.

Vancouver:

Müller, Cristina Emöke Erika 1. Pontos-gatilho e índice de resistência pela elastografia ultrassonográfica em adultos jovens com dor miofascial das regiões de cabeça, pescoço e ombros = Trigger points and ultrasound elastography strain ratio in young adults with head, neck and shoulder myofascial pain: Trigger points and ultrasound elastography strain ratio in young adults with head, neck and shoulder myofascial pain. [Internet] [Thesis]. Universidade Estadual de Campinas; 2017. [cited 2021 Jan 22]. Available from: http://repositorio.unicamp.br/jspui/handle/REPOSIP/330291.

Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation

Council of Science Editors:

Müller, Cristina Emöke Erika 1. Pontos-gatilho e índice de resistência pela elastografia ultrassonográfica em adultos jovens com dor miofascial das regiões de cabeça, pescoço e ombros = Trigger points and ultrasound elastography strain ratio in young adults with head, neck and shoulder myofascial pain: Trigger points and ultrasound elastography strain ratio in young adults with head, neck and shoulder myofascial pain. [Thesis]. Universidade Estadual de Campinas; 2017. Available from: http://repositorio.unicamp.br/jspui/handle/REPOSIP/330291

Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation

.