THESIS ON ULTRASOUND ELASTOGRAPHY

PV loop measurement requires the introduction of a pressure or pressure-volume catheter into the left ventricle. Comparison of sonoelastography guided biopsy with systematic biopsy: The semiquantitative method is penalized by a lack of standardization and represents only an indirect measure [35]. Mean score of elasticity was significantly higher in malignant lesions score 4. The technique is typically performed with ultrasound, but researches with Magnetic resonance imaging are also ongoing. Finally, SWEI derived measurements of diastolic function were compared to the gold standard PV measurements of cardiac diastolic function including end diastolic stiffness and the relaxation time constant. Questo articolo rivisita le basi tecniche, i criteri interpretativi delle immagini, i principali studi clinici e le possibili cause di errore.

All items in Spectrum are protected by copyright, with all rights reserved. Elastography is performed in the same clinical setting with conventional B-mode breast ultrasonography. Pathology of cervical lymph nodes. Fat-lesion ratio in breast elastography. These novel techniques developed in this thesis research have great potentials to substantially improve the performance of ultrasound SWE and widen its spectrum of clinical applications. However, the reported data are not comparable due to the use of different cut-off levels. Acoustic radiation force ARF based ultrasound elastography techniques were developed in early s and have been used to measure the static stiffness of tissue.

Elastogram, is an image of relative hardness and hltrasound practical point thfsis viewthe numerical value of tissue elasticity cannot be reconstructed because the amount of pressure applied is unknown so that interpretation of the image is done at visual basics by colored scale and gray scale not at numerical basics.

In view of the high sensitivity in the characterization of lesions, the variability between the different centers revealed an interoperator variability linked to individual differences in the examination technique.

Ultrasound Elastography: Direct Strain Estimation

Sonoelastography, Breast elastography, Breast lesions. So that, in clinical practice, sonography practitioners preferred to use both methods in real time.

thesis on ultrasound elastography

To overcome these limitations and obtain a more accurate characterization of breast lesions, Elastgraphy elastography was introduced. Observations of tissue response to acoustic radiation force: The stiffness of malignant lesions may be influenced by an intra and extranodular desmoplastic reaction, by neoplastic infiltration of the interstitial tissue e.

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Khodadadi, Hossein Ultrasound Elastography: In sonographic elastography, image representation of tissue hardness can be obtained using a conventional sonography machine with special software and a conventional ultrasound probe.

Finally, SWEI derived measurements of diastolic function were compared to the gold standard PV measurements of cardiac diastolic function including end diastolic stiffness and the relaxation time constant.

And most important and annoying for both the patient elastograpyh the doctor detecting either those enlarge lymph nodes are benign or malignant. However, the method has certain limitations, as it is an exclusively qualitative method which may be influenced by histotype and lesion size, it is an operator-dependent technique which requires special training, and the use of semi-quantitative indices does not improve the performance of the method and does not reduce interoperator variability.

Another is quantitative, as used in shear wave elastography, which employs a primary acoustic impulse focused on a region of interest where it generates pressure waves in transverse propagation able to deform the tissues.

J Mammary Gland Biol Neoplasia. Quantitative evaluation is based on a calculation of the mean value of Young’s modulus in the areas of greater stiffness.

thesi Pirandello 31, Varese, Italy. Supplementary data The following is the Supplementary data related to this article: It should kept in mind that fibroadenomas may be less recognizable in the ARFI images as compared to the corresponding US images; in many cases fibroadenomas elastgraphy be distinguished from the surrounding tissue, but in some cases they may appear stiffer or less stiff than the adjacent tissue [33].

Real time tissue elasticity imaging using the combined autocorrelation method. Viscoelastic imaging of breast tumor microenvironment with ultrasound.

Breast elastography: A literature review

Cervical lymph elastograhpy metastases: Qualitative and semiquantitative evaluations of solid breast lesions by sonoelastography. The effectiveness of the proposed methods is investigated through simulation data, phantom experiments, and in vivo patient data.

Elnakib, Heba Mohamed Ahmed. This thesis research identified the key challenges that reside in the shear wave generation, shear elasticity map reconstruction, shear wave detection and SWE implementation of ultrasound SWE, and proposed four novel techniques including Comb-push Ultrasound Shear Elastography CUSEfast shear compounding, shear wave detection with harmonic imaging, and Time Aligned Sequential Tracking TAST to address these challenges, respectively.

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Breast elastography: A literature review

Elasfography overall goal of the research reported in this thesis, therefore, is to overcome these technical challenges and make ultrasound SWE a faster and better approach. This article has been cited by other articles in PMC. Usually the lesion gives a mixture of the different colour which by using a scoring system could be given of a degree of stiffness and thus determines the probability of malignancy. Several studies have been performed on elastography aiming to improve ultrasound specificity in differentiating between benign and malignant lesions hence help to reduce the number of unnecessary biopsies.

Thus by measuring tissue stiffness we can estimate the probability of malignancy, but elasticity imaging is more sensitive and less subjective than palpation. Skip to main content. With regard to shear wave elastography of the breast, different pressure wave propagation velocities have been observed in various tissues.

SWEI was used to detect the passive effect of thesi perfusion on cardiac compliance and the relationship between perfusion pressure and stiffness was characterized. Elastosonography in the diagnosis of the nodular breast lesions: The first part of this thesis propose a new method which adaptively adjusts the level and orientation of the smoothing strain images using two different mechanisms.

Breast elastography has recently been subject to substantial attention as it has proven to reach an adequate specificity and a high negative predictive value in combination with US.

thesis on ultrasound elastography

The waves travel faster in stiff tissues than in non-stiff tissues [25].

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