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Author: Tiantian Xu Publisher: ISBN: 9781267542731 Category : Blood flow Languages : en Pages : 150
Book Description
Cardiovascular disease is the leading cause death in the United States. Although emergency surgery and medicine can be used for cardiovascular disease treatment, the survivors will suffer for it afterwards. Ultrasound blood flow measurement provides a noninvasive way for cardiovascular diseases diagnosis. In this dissertation, three algorithms for blood flow velocity measurements were investigated and optimized. Feature tracking has been previously proposed for vector velocity measurement. In Chapter 3, the optimal amplitude and time thresholds for feature extraction were investigated to minimize flow estimate variance while providing sufficient spatial and temporal coverage of flow area. A new method of lateral blood flow velocity measurement was investigated in Chapter 4 using the observation that the speckle pattern corresponding to blood reflectors stretches if the blood is moving in the same direction as the electronically-controlled transducer line selection in a 2-D image. The results demonstrated that there is a linear relationship between the speckle size and blood flow velocity, which can be used for ultrasound blood flow velocity measurement. To improve the lateral blood flow estimation performance using speckle size estimation, the relationship between blood flow velocity estimation for flow purely lateral to the ultrasound beam and flow gradient, random scatterer movement and ROI size was investigated and quantitatively assessed in Chapter 5. By changing the ROI sizes, the results showed that different optimal ROI sizes exist in different flow profile regarding the flow gradient and random scatterer movement. The method of blood flow velocity estimation using speckle size estimation was further tested in vivo with jugular vein blood flow from human subjects in Chapter 6. The results showed that speckle size estimation has a comparable estimation performance to spectral Doppler with potential time savings. Finally, a two-dimensional blood flow velocity estimation algorithm using apparent speckle pattern angle was proposed in Chapter 7. The apparent angle of speckle pattern changes with different scan velocities due to mis-registration between the ultrasound beam and scatterers. Results showed that this algorithm can resolve the amplitude and angle of the blood flow simultaneously.
Author: Josef F. Bille Publisher: Springer ISBN: 3030166384 Category : Medical Languages : en Pages : 407
Book Description
This open access book provides a comprehensive overview of the application of the newest laser and microscope/ophthalmoscope technology in the field of high resolution imaging in microscopy and ophthalmology. Starting by describing High-Resolution 3D Light Microscopy with STED and RESOLFT, the book goes on to cover retinal and anterior segment imaging and image-guided treatment and also discusses the development of adaptive optics in vision science and ophthalmology. Using an interdisciplinary approach, the reader will learn about the latest developments and most up to date technology in the field and how these translate to a medical setting. High Resolution Imaging in Microscopy and Ophthalmology – New Frontiers in Biomedical Optics has been written by leading experts in the field and offers insights on engineering, biology, and medicine, thus being a valuable addition for scientists, engineers, and clinicians with technical and medical interest who would like to understand the equipment, the applications and the medical/biological background. Lastly, this book is dedicated to the memory of Dr. Gerhard Zinser, co-founder of Heidelberg Engineering GmbH, a scientist, a husband, a brother, a colleague, and a friend.
Author: Yasushi Takeda Publisher: Springer Science & Business Media ISBN: 4431540261 Category : Technology & Engineering Languages : en Pages : 278
Book Description
The ultrasonic velocity profile (UVP) method, first developed in medical engineering, is now widely used in clinical settings. The fluid mechanical basis of UVP was established in investigations by the author and his colleagues with work demonstrating that UVP is a powerful new tool in experimental fluid mechanics. There are diverse examples, ranging from problems in fundamental fluid dynamics to applied problems in mechanical, chemical, nuclear, and environmental engineering. In all these problems, the methodological principle in fluid mechanics was converted from point measurements to spatio-temporal measurements along a line. This book is the first monograph on UVP that offers comprehensive information about the method, its principles, its practice, and applied examples, and which serves both current and new users. Current users can confirm that their application configurations are correct, which will help them to improve the configurations so as to make them more efficient and effective. New users will become familiar with the method, to design applications on a physically correct basis for performing measurements accurately. Additionally, the appendix provides necessary practical information, such as acoustic properties.
Author: I. Zalud Publisher: Springer Science & Business Media ISBN: 3540289038 Category : Medical Languages : en Pages : 625
Book Description
Expanded and updated edition highlighting current standards and breakthroughs in the technology of Doppler ultrasound Includes latest advances in 3D and color doppler and 4D fetal echocardiography Includes more than 500 illustrations, including more than 150 in color
Author: Jørgen Arendt Jensen
Author: Jørgen Arendt Jensen
Author: Godwin Yat-Wah Liu
Author: James Meyer Griffith
Author: Tiantian Xu
Author: Josef F. Bille
Author: 
Author: Katherine Whittaker Ferrara
Author: Yasushi Takeda
Author: Hideyuki Hasegawa
Author: I. Zalud