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Timothy J. Hall, Ph.D.
Breast Elastography
Timothy J. Hall, Ph.D.
03/09/2009 | Time : 31 min
About This Lecture:

Topics mentioned in this video : Breast Cancer statistics, Mechanical (stiffness) changes accompany pathologic changes, Breast Elastography, Elasticity Theory on 1-D, Hooke’s Law and Newton’s Second Law of Motion, Elasticity Theory in 3-D, Stress is the average force per unit area acting on a volume element of a material, Strain is the relative displacement of a material, Change in length per unit length, Elasticity imaging systems on market display mechanical strain, Elasticity in breast imaging – commercial systems used, Criteria for Interpretation, Lesion size ratio, Area Ratio equal to or less than 1 for benign lesions, Area Ratio > 1 for cancers, Lesion shape same as for B mode for benign, Lesion shape different from B mode for malignant, Lesion boundary more clearly defined in elasticity image, Breast elasticity imaging – Broadly Applicable?, Invasive Lobular Carcinoma breast elasticity imaging, Most work has focused in differentiation between solid lesions, Can elastography help define cysts?, Characterisic bull’s-eye pattern indicates a cyst, E-mod imaging adds new information not otherwise available, E-mode imaging increases ability to assess risk of malignancy, Often highest quality of E-mode images obtained with minimal pressure, E-mode can help define lesion boundary, Deformation-Dependent Contrast, E-Mode Image Contrast, Imaging Elastic nonlinearity, Secant Modulus, Imaging Elastic nonlinearity, Small Strain Shear Modulus, Nonlinear Stiffening, 3D RF Acquisition, Mechanically rocked 1D curved linear array, Fully populated 2D Array, CMUT array (“silicon transducer”), Summary of Ongoing Developments, Several available approaches to display elastic nonlinearity, Movies of strain imaging with large deformation, Movies of secant modulus are quantitative, Nonlinear modulus estimation provides quantitative summary images, Extensions to 3-D imaging

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Keywords : 1-D, 3D RF Acquisition, Breast Elastography, bull’s-eye pattern, CMUT array, Deformation-Dependent Contras, Elasticity Theory in 3-D, Elasticity Theory, Elasticity, Elastography, E-mod imaging, E-Mode Image Contrast, e-mode, Hooke’s Law, Imaging Elastic nonlinearity, Lesion boundary definition, Lesion size ratio, mechanical strain, Newton’s Second Law of Motion, Nonlinear Stiffening, Secant Modulus, silicon transducer, Small Strain Shear Modulus, Stiffness imaging, Strain imaging, Strain, Stress

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