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Author: R.P. van Wijk van Brievingh
Publisher: Springer Science & Business Media
ISBN: 940118075X
Category : Medical
Languages : en
Pages : 212
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Book Description
2. Vidicor 3. Anacor 4. Digicor 5. Magnetic Recording of the Videosignal VI. GEOMETRIC MODEL I. Introduction 2. Survey of Models 3. Preparation of Casts 4. Index of Irregularity 5. In Vitro Tests VII. DETECTION OF THE VENTRICULAR CONTOUR I. Introduction 2. Semi-automatic Methods 3. The Influence of the Trained Operator 4. Conclusions VIII. DATA CONVERSION 1. Introduction 2. Light-pen System and Contour Memory 3. Digicor 4. Evaluation Procedure 5. Data Presentation IX. SOFTWARE SYSTEM 1. Introduction 2. Modular Structure 3. Data Conversion 4. Volume Calculation 5. Data Presentation 6. Special Programs X. IN VIVO TESTS 1. Introduction 2. Materials and Methods 3. Results XI. UNCERTAINTY ANALYSIS I. Introduction 2. Uncertainty Intervals for Relevant Variables Propagation 3. of Uncertainty 4. Uncertainty Interval in the Result XII. DISCUSSION XIII. APPENDIX 1. Glossary 2. Dedvations 3. Results XIV. REFERENCES 1. Literature 2. Internal Reports ACKNOWLEDGEMENTS VIII Illustrations Figure Block-diagram of Instrumentation 12 1. 1 Central Synchronization 17 2. 1 2. 2 Effect of Scattered Radiation (Biplane) 18 Block-diagram of X-ray/TV-system 2. 3 21 2. 4 Test-object for OTF-measurement 25 Spatial Responses and Optical Transfer Functions 2. 5 26 Deviation from Isoplanasy and Influence of Additional Equipment 2. 6 28 2. 7 Temporal Modulation Transfer Function Curves 31 2. 8 Biplane Projections 33 2. 9 X-ray Aiming Device 36 2. 10 Calibration Curve 37 3. 1 Concentration vs. Tube Voltage Curves 45 3. 2 Markers and Applicators 48 3. 3.
Author: R.P. van Wijk van Brievingh
Publisher: Springer Science & Business Media
ISBN: 940118075X
Category : Medical
Languages : en
Pages : 212
Get Book Here
Book Description
2. Vidicor 3. Anacor 4. Digicor 5. Magnetic Recording of the Videosignal VI. GEOMETRIC MODEL I. Introduction 2. Survey of Models 3. Preparation of Casts 4. Index of Irregularity 5. In Vitro Tests VII. DETECTION OF THE VENTRICULAR CONTOUR I. Introduction 2. Semi-automatic Methods 3. The Influence of the Trained Operator 4. Conclusions VIII. DATA CONVERSION 1. Introduction 2. Light-pen System and Contour Memory 3. Digicor 4. Evaluation Procedure 5. Data Presentation IX. SOFTWARE SYSTEM 1. Introduction 2. Modular Structure 3. Data Conversion 4. Volume Calculation 5. Data Presentation 6. Special Programs X. IN VIVO TESTS 1. Introduction 2. Materials and Methods 3. Results XI. UNCERTAINTY ANALYSIS I. Introduction 2. Uncertainty Intervals for Relevant Variables Propagation 3. of Uncertainty 4. Uncertainty Interval in the Result XII. DISCUSSION XIII. APPENDIX 1. Glossary 2. Dedvations 3. Results XIV. REFERENCES 1. Literature 2. Internal Reports ACKNOWLEDGEMENTS VIII Illustrations Figure Block-diagram of Instrumentation 12 1. 1 Central Synchronization 17 2. 1 2. 2 Effect of Scattered Radiation (Biplane) 18 Block-diagram of X-ray/TV-system 2. 3 21 2. 4 Test-object for OTF-measurement 25 Spatial Responses and Optical Transfer Functions 2. 5 26 Deviation from Isoplanasy and Influence of Additional Equipment 2. 6 28 2. 7 Temporal Modulation Transfer Function Curves 31 2. 8 Biplane Projections 33 2. 9 X-ray Aiming Device 36 2. 10 Calibration Curve 37 3. 1 Concentration vs. Tube Voltage Curves 45 3. 2 Markers and Applicators 48 3. 3.
Author: H. Just
Publisher: Springer Science & Business Media
ISBN: 3662008203
Category : Medical
Languages : en
Pages : 474
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Book Description
With contributions by numerous experts
Author: P.W. Serruys
Publisher: Springer Science & Business Media
ISBN: 9401583587
Category : Medical
Languages : en
Pages : 754
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Book Description
Quantitative coronary angiography has become an invaluable tool for the interventional cardiologist, providing objective and reproducible measurements of coronary artery dimensions, which can be used to study progression or regression of coronary atherosclerosis, as well as the immediate and long term effects of percutaneous interventions. Until recently, this powerful imaging technology was confined to a small number of so-called high level institutions. Fortunately, with the development of digital cardiac imaging equipment and adaptation of cine-angiographically based computer software for on-line use in the catheterization room, quantitative coronary angiography is now available to all interventionalists. This book is a timely guide for the impending QCA user, providing practical as well as theoretical and scientific information. A comprehensive evaluation of the clinical usefulness of QCA is covered, from the fundamental principles through experimental validation studies, application to clinical trials of a wide range of pharmacological and interventional therapies in the full spectrum of clinical presentation of coronary disease syndromes, evaluation of the therapeutic efficacy of various new devices for coronary intervention, together with extensive presentation of its physiological, functional and anatomical correlations, by comparison with other intracoronary measurement and imaging techniques. In addition, evolving theories and concepts in the ever topical `restenosis phenomenon' after percutaneous intervention, based on serial QCA studies, are presented and discussed and a potentially unifying methodological approach to further study of this ubiquitous problem is offered. This book, thanks to the collaboration of many experts in the field of intracoronary imaging and measurement, provides stimulating, interesting and practical information, both for the academic scientist and practising clinician.
Author: Johan H. C. Reiber
Publisher: Springer Science & Business Media
ISBN: 940111854X
Category : Medical
Languages : en
Pages : 617
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Book Description
In this fourth book in the series on quantitative coronary arteriography (QCA) with the earlier three volumes published in 1986, 1988 and 1991, the latest developments in this exciting field are covered. Both the methodolog ical and clinical application aspects of these advances are presented in a comprehensive manner in a total of 37 chapters by world renowned experts. The book is subdivided into a total of eight parts, beginning with the more methodological issues, such as QCA and other modalities (3 chapters), cine film versus digital arteriography (3 chapters), quality control in QCA (4 chapters), and coronary blood flow and flow reserve (3 chapters). Since QCA has been well established as the technique for the assessment of regression and progression in atherosclerotic disease, and of restenosis after recanaliz ation procedures, major clinical trials in both groups are described extensively by their principal investigators in a total of 11 chapters. In addition, the QCA results after the application of various recanalization techniques are presented in another eight chapters. In the last part the experiences with various intracoronary prostheses with the emphasis on QCA are discussed in five chapters. This large increase in application oriented chapters means that QCA is well alive and gaining momentum. Although the accuracy and precision of the analytical methods steadily improve with the increasing complexity of the algorithms, there is still always the human factor involved in these processes in terms of frame selection, segment definition, etc.
Author: Johan Janssen
Publisher:
ISBN: 9789023223924
Category : Angiography, Digital subtraction
Languages : en
Pages : 124
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Book Description
Author: Johan H. C. Reiber
Publisher: Springer Science & Business Media
ISBN: 9400942397
Category : Medical
Languages : en
Pages : 473
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Book Description
In recent years there has been an increasing interest in quantitative analysis of coronary cineangiograms and already for a longer time of left ventricular cin eangiograms. The needfor quantitationofcoronary arterialdimensions has been stimulated by the introduction ofnew therapeutic procedures in the catheteriza tionlaboratory, suchas the balloon dilatationtechnique (PTCA) and thromboly tic therapy, by the need to study the vasoactive responses of pharmaceutical agents, and also by the desire to study the progressive nature ofcoronary artery disease with the ultimate goal to find ways to bring a halt to the progression of coronary atherosclerosis or even achieve regression of the disease. Parallel with these clinical developments, rapid technical developments in computerarchitect ures and semiconductor memories have made it possible to digitize and store cineframesor selected portions thereof in image processors and to analyze these pictorial data quantitatively at affordable prices. More than 15 years of research have been directed by various groups towards the semi- or fully-automated delineation of the left ventricular boundaries on a frame-to-frame basis. Yet not a single system with fully-automated capability is commercially available. In the mean time many different left ventricular wall motion models have been developed, again with little consensuson which model is to be preferred as no golden standard exists.
Author: S. Sideman
Publisher: Springer Science & Business Media
ISBN: 9400949928
Category : Medical
Languages : en
Pages : 448
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Book Description
The ultrasound velocity tomography allows measurement of cardiac geometries for various phases in the cardiac cycle. The present tomograph makes reconstruc tions at intervals of 20 ms. Because of a lack of clear (intramural) landmarks (except the roots of the papillairy muscle), it is difficult to pinpoint spatial trajectories of particular points in the heart. Therefore, a second method was developed of injecting radiopaque markers in the heart and following their motion patterns during the cardiac cycle with help of a biplane X-ray equipment. The data obtained with both methods can be implemented in our finite element model of the heart to compute intramural stresses and strains. The results obtained sofar with the extended Darcy equation to account for the interaction of blood rheology and tissue mechanics look promising. Further testing with more sophisticated subjects than mentioned in Figure 9 is required before it will be implemented in our finite element model of the heart. We conclude that analysis of regional cardiac function, including regional myocardial blood flow, requires still a major research effort but the results obtained sofar justify, to our opinion, a continuation in this direction. Acknowledgement The authors acknowledge Dr. C. Borst and coworkers for doing the animal experiments and prof. Van Campen and dr. Grootenboer for their participation is some aspects of this work.
Author: Johan H. C. Reiber
Publisher: Springer Science & Business Media
ISBN:
Category : Medical
Languages : en
Pages : 448
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Book Description
This volume is the fifth in a series on quantitative coronary arteriography (QCA). The following topics, which all currently are and continue to be issues of extensive discussions in the research and clinical communities, are covered in great detail in this volume: endothelial function; comparisons between digital and cine coronary arteriography; inter-laboratory variation between QCA Core Laboratories; the developments in digital archival media; intracoronary pressure, coronary blood flow and flow reserve; quantitative and qualitative features in regression/progression studies; QCA in recanalization studies; and finally the current position of rivalling modalities as coronary angioscopy, intraluminal imaging with ultrasound and fluorescence spectroscopy.
Author: J. Meyer
Publisher: Springer Science & Business Media
ISBN: 9400967209
Category : Medical
Languages : en
Pages : 269
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Book Description
Many noninvasive examination methods of the heart have not held out against the invasive methods, which modern cardiac therapy, surgically or with catheterization, requires. They have disappeared completely or are only used by isolated groups of researchers. However, there is an obvious tendency to apply the invasive procedures as the last diagnostic possibility. In the attempt to select clinically relevant methods, the expert authors of this book demonstrate that echocardiography, expanded with contrast and Doppler, has been developed into one of the most important noninvasive methods. The results with tissue characterization show that the possibilities of this method have not yet been fully explored. Nuclear procedures are widely used, although they should only be applied in direct connection with clinical cardiology. The new lead methods of the ecg, such as ecg-mapping, show that standard electrocardiography of electrical functions is not yet fully exploited. The rapidly developing method of computer tomography is also being applied to cardiology. Since nuclear magnetic resonance requires extensive equipment con struction, its future is as yet unsure. Of course, a book like this does not intend to treat the subject of noninvasive cardiology in extensive detail. Established methods like standard electrocardio graphy, phonocardiography and sphygmography are not discussed. The aim of this book is rather to demonstrate the trend of present developments in the field. LIST OF CONTRIBUTORS Ameling, W., Rogowski-Institut fUr Elektronik, Rheinisch-Westfalische Technische Hochschule, Goethestrasse 27/29, D-5100 Aachen, FRG. Bachmann, K., Medizinische Poliklinik, Universitat Eriangen-NUrnberg, Ostliche Stadtmauerstrasse 29, D-8520 Erlangen, FRG.
Author: Johan H. C. Reiber
Publisher: Springer Science & Business Media
ISBN: 9400913095
Category : Medical
Languages : en
Pages : 309
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Book Description
There are few techniques that have influenced therapeutic strategies in modem cardiology to a similar extent as coronary arteriography. Bypass surgery as well as transluminal coronary angioplasty would not have been possible without coronary angiography serving as a 'midwife' in their evolu tion. Despite the widespread and long-standing use in clinical practice, however, the interpretation of coronary angiograms has not changed very much since the early days. Most angiogr~s are still reviewed in a visual and semi-quantitative and thus often very subjective way. In the face of an almost exploding field for interventional catheterization including thrombolysis, balloon dilatation, and other rapidly evolving techniques for transluminal revascularization or recanalization, a more detailed and quantitative analysis of coronary arteriograms is urgently required. In addition to the delineation of coronary morphology, we need dynamic and functional information about flow and perfusion to understand the physiological significance of anatomic abnormalities. Coronary arteriography contains and can provide most of this information. With the application of appropriate techniques, it can be made available in the catheterization laboratory even during the patient's investiga tion, thus facilitating and improving clinical decision making. Objective and reproducible analysis will furthermore enhance our understanding about the pathophysiology of coronary disease.
