Download or read book chographie de contraste written by Francois Tranquart and published by Springer Science & Business Media. This book was released on 2007-12-22 with total page 311 pages. Available in PDF, EPUB and Kindle. Book excerpt: La mise à disposition des agents de contraste ultrasonores a introduit une nouvelle dimension dans l’examen échographique avec la possibilité d’une exploration en temps réel de la cinétique de prise de contraste de lésions variées. Les indications potentielles de ces microbulles touchent la quasi-totalité des organes profonds et superficiels, mais également les possibilités d’études pharmacologiques pour la néo-angiogenèse ou le guidage thérapeutique par méthodes physiques. Enfin de nouvelles applications se font jour dans le domaine des produits ciblés et le transport de principes actifs. Il nous est apparu opportun de tenter de faire le point sur ce monde en mouvement au travers d’une collaboration intense entre les diverses équipes impliquées et reconnues dans ce domaine et dont malheureusement, seulement certaines sont ici représentées. Nous souhaitons que cet ouvrage soit un point de référence actuel de l’échographie de contraste, point qui demandera certainement à évoluer dans les prochaines années. Il démontre avec force que les ultrasons peuvent jouer un rôle très important dans l’imagerie moderne tant diagnostique que thérapeutique en raison de leur performance diagnostique mais également de leur caractère non invasif. Nous espérons que vous prendrez autant de plaisir à y rechercher l’information utile que nous en avons eu à découvrir une imagerie fonctionnelle ultrasonore en temps réel et écrire ces différents chapitres.

Download or read book Les produits de contraste en chographie written by Frédéric Cyril Verez and published by . This book was released on 2000 with total page 106 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Download or read book Ultrasound contrast agents written by Gaio Paradossi and published by Springer Science & Business Media. This book was released on 2010-07-16 with total page 199 pages. Available in PDF, EPUB and Kindle. Book excerpt: Recent advancements in nano/micro materials and related characterization approaches allow the design of a new type of ultrasound contrast agents (UCAs) with enhanced multifunctional behaviour. This is chance is also supported by the recent achievements in modelling and signal processing. This book provides the state of art of the research activity of two successful European projects, TAMIRUT and SIGHT, addressing an integrated system, encompassing the contrast agent, the hardware equipment and the processing strategies, as a key tool for a combined diagnostic and therapeutic approaches (theranostics) in medical ultrasound. The work provides a highlight of the state of art in the research of novel ultrasound contrast agents (UCAs). Main progresses on the multifunctional aspects of next-generation UCAs concern targeting and drug release properties, perfusion and biointerface behaviour, ultrasound scattering performance, signal processing, electronic equipment.

Download or read book Produits de contraste ultrasonore evaluation acoustique in vitro et application written by Ayache Bouakaz and published by . This book was released on 1996 with total page 0 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Download or read book Contrast Enhanced Ultrasound written by Alexander N. Sencha and published by Springer Nature. This book was released on 2022-06-28 with total page 356 pages. Available in PDF, EPUB and Kindle. Book excerpt: This book provides a comprehensive analysis of the value of contrast-enhanced ultrasound (CEUS) in the diagnosis of a wide variety of pathologies. Sonography reliably identifies a wide range of diseases, and the efficacy of modern ultrasound has dramatically improved with contrast enhancement. This book covers almost all aspects of CEUS starting from basic principles and ending with features of its application in individual organs. In particular, it explores the diseases of abdominal, retroperitoneal, and pelvic organs as well as superficial structures, highlighting the characteristic features of typical findings. Focal lesions are discussed in depth, with attention to their early detection and differential diagnosis. Besides, a practical approach to the stratification of the risk of malignancies is provided. The authors summarized their own experience with CEUS in oncology, hepatology, gynecology, urology, endocrinology, and other fields of medicine. The role of CEUS in differential diagnosis of various disorders of the female reproductive system is comprehensively discussed as well. The presentation is clear and concise, and richly illustrated. The book will be a helpful tool for both residents and practitioners approaching ultrasound diagnostics, as well for more experienced radiologists and other professionals.

Download or read book Contrast Enhanced Ultrasound in Clinical Practice written by Thomas Albrecht and published by Springer Science & Business Media. This book was released on 2005-01-12 with total page 76 pages. Available in PDF, EPUB and Kindle. Book excerpt: The value of ultrasound contrast agents (USCA) in everyday clinical practice depends on the pharmacokinetics, the signal processing, and the contrast-specific imaging modalities. Second-generation USCA, are blood pool agents that do not leak into the organ tissue to be examined but remain in the intravascular compartment increasing the Doppler signal amplitude during their dynamic vascular phase. Taking advantage of the stability of their microbubbles, they can withstand the acoustic pressure of insonation much better than first-generation contrast media, which results in an increased half-life of the agent and, consequently, in a prolonged diagnostic window. Concomitant with the improvement of contrast agents, different contrast-specific imaging modalities have been developed which, used in combination with USCA and a low mechanical index, allow continuous real-time grey-scale imaging. These recent technical improvements have opened new possibilities in the use of USCA in a variety of indications. Written by internationally renowned experts, the contributions gathered in this book give an overview of current and possible future new applications of USCA in routine and clinical practice.

Download or read book PRODUITS DE CONTRASTE ULTRASONORE written by AYACHE.. BOUAKAZ and published by . This book was released on 1996 with total page 231 pages. Available in PDF, EPUB and Kindle. Book excerpt: IL EST EN GENERAL PLUS DELICAT POUR UN RADIOLOGUE D'INTERPRETER DES IMAGES ULTRASONORES QUE DES IMAGES ISSUES D'AUTRES MODALITES D'IMAGERIE. IL N'EXISTE EN EFFET PAS DE REPERES EXPLICITES SUR L'IMAGE ULTRASONORE. DANS CE CAS ET COMME CELA EXISTE DEJA POUR LES AUTRES TECHNIQUES D'IMAGERIE, L'UTILISATION DE PRODUITS DE CONTRASTE PEUT ETRE ENVISAGEE. TYPIQUEMENT, L'ECHOGRAPHIE DE CONTRASTE CONSISTE A INJECTER DANS LA CIRCULATION SANGUINE DES MICROPARTICULES GAZEUSES QUI CONSTITUENT DES DIFFUSEURS DES ONDES ULTRASONORES, DANS LE BUT D'AMELIORER L'ECHOGENEITE DE CERTAINES STRUCTURES DU CORPS HUMAIN. ON PROPOSE DANS LA PREMIERE PARTIE DE CE TRAVAIL UNE APPROCHE BIBLIOGRAPHIQUE THEORIQUE PERMETTANT LA CARACTERISATION ACOUSTIQUE DES PRODUITS DE CONTRASTE. EN MEME TEMPS, UN BANC DE MESURE EXPERIMENTAL EST DEVELOPPE ET MIS AU POINT POUR QUANTIFIER LES PROPRIETES ULTRASONORES DES PRODUITS DE CONTRASTE IN VITRO. LES PRODUITS SONT CARACTERISES PAR LE COEFFICIENT DE REFLEXION, LE COEFFICIENT D'ATTENUATION ET LE RAPPORT REFLEXION/ATTENUATION (SCATTERING TO ATTENUATION RATIO - STAR). LES CONDITIONS EXPERIMENTALES CORRESPONDENT A LA REALITE CLINIQUE. LA CONNAISSANCE DE CES PARAMETRES EST ESSENTIELLE POUR UNE EXPLOITATION EFFICACE ET APPROPRIEE DES PRODUITS. ON PRESENTE PAR LA SUITE UNE METHODE PERMETTANT DE DEDUIRE L'APPORT EN NIVEAU DE GRIS DU PRODUIT DE CONTRASTE SUR L'IMAGE ECHOGRAPHIQUE PAR RAPPORT A L'APPORT DES TISSUS BIOLOGIQUES. ON DEDUIT AINSI LES VALEURS OPTIMALES DE CET APPORT POUR AVOIR UN REHAUSSEMENT VISUEL SATISFAISANT SUR L'IMAGE. ON PRESENTE ENFIN UNE NOUVELLE APPLICATION ECHOGRAPHIQUE AVEC PRODUIT DE CONTRASTE: ECHOGRAPHIE ENDOVASCULAIRE DE CONTRASTE. L'INJECTION D'UN AGENT DE CONTRASTE DANS UNE ARTERE S'AVERE TRES BENEFIQUE POUR LA MISE EN EVIDENCE DE SA PAROI

Download or read book Acoustic Characterization of Contrast Agents for Medical Ultrasound Imaging written by L. Hoff and published by Springer Science & Business Media. This book was released on 2013-06-29 with total page 218 pages. Available in PDF, EPUB and Kindle. Book excerpt: Contrast agents for medical ultrasound imaging is a field of growing interest. A large amount of literature has been published on the medical applications of such contrast agents. However, there is no textbook giving a broad overview of the physics and acoustics of the agents. This monograph aims to fill this gap. The book is written by a physicist, from a physics point of view, and it tries to draw links from the physics and acoustics to the medical imaging methods, but medical applications are mainly included for background information. The book consists of nine chapters. The first three chapters give a broad overview of the acoustic theory for bubble-sound interaction, both linear and nonlinear. Most contrast agents are stabilized in a shell, and this shell can have a strong influence on the interaction between the bubbles and the ultrasound. The effect of the shell is given special attention, as this is not easily found in other bubble literature. The following chapters, 4, 5, 6, and 7, describe experimental and theoretical methods used to characterize the acoustic properties of the agents, and results of studies on some agents. Chapter 8 shows how the theory and the experimental results can be combined and used to model various phenomena by means of computer simulations. The main purpose of the simulations is to get insight into the mechanisms behind the described phenomena, not to get accurate predictions and values. The book is aimed at both newcomers into the field, as well as those who are more experienced but want better insight into the acoustics of the contrast bubbles.

Download or read book Contrast Media in Ultrasonography written by Emilio Quaia and published by Springer Science & Business Media. This book was released on 2005-03-08 with total page 452 pages. Available in PDF, EPUB and Kindle. Book excerpt: Examines in detail the different clinical applications of microbubble-based contrast agents. Explains the principles underlying the use of contrast-specific imaging techniques and the examination methodology. Contains numerous high-quality illustrations, including many in color. Written by recognized experts.

Download or read book Advances in Echo Imaging Using Contrast Enhancement written by N.C. Nanda and published by Springer Science & Business Media. This book was released on 2013-04-17 with total page 399 pages. Available in PDF, EPUB and Kindle. Book excerpt: This book will familiarize the reader with recent advances in echo imaging technology with special emphasis on echo enhancing agents. Several important strides have been made in this field during the past few years, especially in the contrast enhancement of conventional and color Doppler images. The book begins with chapters on the history of contrast echocardiography, the principles of contrast echo and descriptions of new contrast agents capable of transpulmonary passage following intravenous injection. Safety issues in contrast echocardiography are also discussed. The second section of the book deals with clinical uses of echo contrast agents. Their usefulness in the identification of cardiac structures and assessment of pathological lesions using both transthoracic and transesophageal echocardiography are fully discussed. Technical and practical considerations in the use of various contrast agents are also described. The use of contrast echo in the identification of cardiac sources of embolism as well as possible mechanisms and clinical significance of spontaneous contrast echoes are also covered. Six chapters fully discuss the basics of contrast enhancement of conventional and color Doppler images and its clinical utility in the noninvasive assessment of pulmonary artery pressure, regurgitant and stenotic lesions and in the delineation of coronary arteries. Another chapter describes the non-cardiac applications of the echo contrast enhancement technique. The final section of the book investigates the role of echo contrast enhancement in quantitative cardiovascular analysis.

Download or read book APPORT DE L ECHOGRAPHIE DOPPLER COULEUR AVEC INJECTION DE PRODUIT DE CONTRASTE ULTRASONORE DANS L EXAMEN DES PETITS MELANOMES MALINS DE LA CHOROIDE written by STEPHAN.. BARUDIO and published by . This book was released on 1999 with total page pages. Available in PDF, EPUB and Kindle. Book excerpt:

Download or read book Enhancing the Role of Ultrasound with Contrast Agents written by Riccardo Lencioni and published by Springer Science & Business Media. This book was released on 2006-08-06 with total page 252 pages. Available in PDF, EPUB and Kindle. Book excerpt: This book provides an up-to-date overview on the clinical value of contrast agents in ultrasound. The volume moves from a background section on technique and methodology to the main sections on the clinical application of contrast ultrasound in the liver and in vascular diseases. A final section discusses results and prospects of contrast ultrasound modality in the other fields.

Download or read book Imagerie de contraste ultrasonore avec transducteurs capacitifs micro usin s written by Anthony Novell and published by . This book was released on 2011 with total page 0 pages. Available in PDF, EPUB and Kindle. Book excerpt: Les produits de contraste ultrasonore constituent un véritable apport pour l'imagerie échographique et sont aujourd'hui utilisés en clinique pour l'évaluation de la perfusion cardiaque ou encore la détection de tumeurs. Depuis quelques années, les transducteurs capacitifs micro-usinés (cMUTs) se présentent comme une alternative intéressante aux transducteurs piézoélectriques classiques et offrent certains avantages comme une large bande passante. Nous proposons dans cette thèse d'évaluer le potentiel de cette technologie pour l'imagerie de contraste. Dans un premier temps, notre étude s'est orientée vers l'adaptation des cMUTs à l'imagerie non linéaire. Ensuite, de nouvelles méthodes de détection de contraste, basées sur le comportement spécifique des microbulles, ont été développées pour exploiter les avantages de la technologie cMUT. Comparés aux méthodes conventionnelles, les résultats obtenus montrent une meilleure visualisation des agents de contraste par rapport aux tissus environnants. L'utilisation de cMUTs améliore l'efficacité de ces méthodes démontrant, ainsi, leur intérêt pour l'imagerie de contraste.

Download or read book Imagerie des produits de contraste ultrasonore written by Laurent Gerfault and published by . This book was released on 2000 with total page 206 pages. Available in PDF, EPUB and Kindle. Book excerpt: A l'instar des autres méthodes d'imagerie (IRM, Rayons X), l'échographie est devenue une imagerie de contraste. Elle consiste en l'amélioration des performances de l'imagerie classique par injection intraveineuse d'un produit de contraste, constitué par une population de microparticules gazeuses (diamètre inférieur à 10 pm). L'agent de contraste ultrasonore est strictement vasculaire, il permet d'augmenter l'intensité vidéo sur 1 'image écho graphique et le signal Doppler des zones vascularisées dans le but d'améliorer la visualisation de structures internes du corps humain et d'aborder l'imagerie fonctionnelle telle que la perfusion myocardique. Les performances acoustiques in vitro de ces produits sont avérées. Cependant, l'utilisation de ceux ci dans le corps humain n'a pas permis d'obtenir la même efficacité. Ainsi, ce travail à pour but de mieux connaître le produit et ses interactions avec le milieu intracorporel. Les int1uences du milieu (filtrage pulmonaire, dilution du bolus de l'agent de contraste, diffusion du gaz interne des particules, pression cardiaque, ...) et de l'onde acoustique sont abordées pour connaître les modifications physiques du produit in vivo. L'impact de ces paramètres physiques sur la réponse acoustique des particules est étudié à partir d'un modèle acoustique linéaire dont nous précisons le domaine de validité. L'évaluation clinique se réalisant sur l'image échographique, nous présentons une simulation des signaux échographiques des produits de contraste. Cette approche qualitative est complétée par une approche quantitative portant sur la mesure de la perfusion. En premier lieu, nous comparons un modèle basé sur la mécanique des fluides, décrivant la dilution d'un bolus d'agent, à des mesures acoustiques effectuées sur un système circulant tubulaire. En second lieu, nos conclusions sur ce fantôme sont appliquées à l'étude de la perfusion myocardique sur des cœurs isolés de porcs.

Download or read book Contrast Enhanced Ultrasound of Liver Diseases written by L. Solbiati and published by Springer Science & Business Media. This book was released on 2012-12-06 with total page 140 pages. Available in PDF, EPUB and Kindle. Book excerpt: In the last few years, the development of sonographic contrast agents - or "microbubbles" - has stimulated increasingly intensive studies on the rela tionships between ultrasound and contrast media. As a result, "contrast -spe cific" hardware and software systems have been introduced by different ultra sound manufacturers with impressive speed. This has finally led to the birth of a very new imaging modality -"contrast-enhanced sonography" (CEUS). Since 1999, the introduction of second-generation contrast agents has represented a decisive step towards the extensive clinical use of CEUS and has simultaneously made obsolete most, if not all, scientific publications available so far. This book is, to our knowledge, the first to deal entirely with second generation contrast agents and the most updated contrast-specific software for noncardiologic uses. The reasons why the liver has been chosen as the only "target" of the book are easily understandable by radiologists and hepatologists alike. The study of vascularity is the only purpose of CEUS, and the liver has a unique vascular system, with two different inflow systems resulting in a single outflow. Furthermore, the pathologically different focal liver lesions (FLLs) are mostly characterized by different "models" of vascularity: CEUS can mimic contrast enhanced computed tomography and magnetic resonance imaging, basing differential diagnosis on the morphological and temporal characteristics of enhancement, but with the additional unique advantage of the study being done in real-time.

Download or read book D tection Et Caract risation de la Destruction Des Microbulles de Produit de Contraste Ultrasonore written by Azzdine Yahya Ammi and published by . This book was released on 2006 with total page 146 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Download or read book Ultrasound Contrast Agents written by Barry B. Goldberg and published by CRC Press. This book was released on 1996-11-14 with total page 196 pages. Available in PDF, EPUB and Kindle. Book excerpt: The development and improvement of ultrasound contrst agents has greatly aided sonographers in the evaluation of a variety of diseases and disorders. This work sets out to familiarize the reader with the principles and practicalities of contrast agents of different chemical composition, and with which agent to use for each specific body system.