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Scatter Correction For Spectral Computed Tomography
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Book Synopsis Scatter Correction for Spectral Computed Tomography by : Odran Pivot
Download or read book Scatter Correction for Spectral Computed Tomography written by Odran Pivot and published by . This book was released on 2019 with total page 113 pages. Available in PDF, EPUB and Kindle. Book excerpt: Scattered radiation is a major cause of bias, loss of contrast and artifacts in x-ray computed tomography (CT). Many correction methods have been proposed for conventional CT (using energy-integrating detectors) but it is still an open research topic in the field of spectral CT, a novel imaging technique based on the use of energy-selective photon counting detectors. The main objective of the present thesis was to investigate scatter correction techniques adapted to spectral CT. The chosen solution refines a scatter correction method developed for integration-mode CT which uses a semi-transparent primary modulator mask. The attenuation of the primary modulator mask is first compensated for with a correction matrix which takes advantage of the spectral information. The other contributions are a scatter model based on B-splines allowing an accurate representation of scatter maps with the aid of a very few parameters and a cost function which takes into account the structures of the mask and the object. The accuracy of the correction matrix, the scatter model and the whole proposed scatter correction process were tested on simulated data considering photon counting detectors with various numbers of energy bins and have shown a significant bias reduction, contrast enhancement and artifact removal. In addition, physical experiments were performed using a parallel fan-beam set-up with a commercial energy-resolved detector. The method was successfully validated in the case of two phantoms dedicated to medical image quality measurements, with a remarkable improvement.
Book Synopsis Dual-window Scatter Correction in Quantitative Single-photon-emission Computed Tomography by : Jian-qiao Luo
Download or read book Dual-window Scatter Correction in Quantitative Single-photon-emission Computed Tomography written by Jian-qiao Luo and published by . This book was released on 1993 with total page 326 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Author :Björn J. Heismann Publisher :SPIE-International Society for Optical Engineering ISBN 13 :9780819492579 Total Pages :0 pages Book Rating :4.4/5 (925 download)
Book Synopsis Spectral Computed Tomography by : Björn J. Heismann
Download or read book Spectral Computed Tomography written by Björn J. Heismann and published by SPIE-International Society for Optical Engineering. This book was released on 2012 with total page 0 pages. Available in PDF, EPUB and Kindle. Book excerpt: Computed tomography (CT) is a widely used x-ray scanning technique. In its prominent use as a medical imaging device, CT serves as a workhorse in many clinical settings throughout the world. It provides answers to urgent diagnostic tasks such as oncology tumor staging, acute stroke analysis, or radiation therapy planning. Spectral Computed Tomography provides a concise, practical coverage of this important medical tool. The first chapter considers the main clinical motivations for spectral CT applications. In Chapter 2, the measurement properties of spectral CT systems are described. Chapter 3 provides an overview of the current state of research on spectral CT algorithms. Based on this overview, the technical realization of spectral CT systems is evaluated in Chapter 4. Device approaches such as DSCT, kV switching, and energy-resolving detectors are compared. Finally, Chapter 5 summarizes various algorithms for spectral CT reconstructions and spectral CT image postprocessing, and links these algorithms to clinical use cases
Book Synopsis Scatter Correction in Single Photon Emission Computed Tomography by : Darin Steven O'Keeffe
Download or read book Scatter Correction in Single Photon Emission Computed Tomography written by Darin Steven O'Keeffe and published by . This book was released on 1990 with total page pages. Available in PDF, EPUB and Kindle. Book excerpt:
Book Synopsis Physics and Computational Methods for X-ray Scatter Estimation and Correction in Cone-beam Computed Tomography by : Gregory James Bootsma
Download or read book Physics and Computational Methods for X-ray Scatter Estimation and Correction in Cone-beam Computed Tomography written by Gregory James Bootsma and published by . This book was released on 2013 with total page pages. Available in PDF, EPUB and Kindle. Book excerpt:
Book Synopsis Correction of Scattered Radiation in Multi-energy Radiography and Tomography by : Artur Sossin
Download or read book Correction of Scattered Radiation in Multi-energy Radiography and Tomography written by Artur Sossin and published by . This book was released on 2019 with total page 193 pages. Available in PDF, EPUB and Kindle. Book excerpt: X-ray imaging coupled with recently emerged energy-resolved photon counting detectors provides the ability to differentiate material components and to estimate their respective thicknesses. However, such techniques require highly accurate images. The presence of scattered radiation leads to a loss of spatial contrast and, more importantly, a bias in radiographic material imaging and computed tomography (CT). Additionally, artifacts are also introduced in the case of the latter. The main aim of the present thesis was to develop a scatter correction approach adapted for multi-energy imaging. In order to achieve this task, a secondary objective was also set. Namely, the conception and validation of a simulation tool capable of providing energy-resolved scatter simulations in a reasonable time. Once validated through simulations and experimentally, this tool gave the ability to study the behavior of scattered radiation both in spatial and energy domains. Based on the conducted scatter analysis, a Partial Attenuation Spectral Scatter Separation Approach (PASSSA) adapted for multi-energy imaging was developed. The evaluation of PASSSA in radiographic mode through simulations and experiments revealed noteworthy results both in terms of image contrast improvement and scatter induced bias reduction. Additionally, simulation studies examined the performance of the developed approach in CT, where PASSSA also proved to be quite effective at correcting scatter induced distortions. Moreover, the performance improvement in the context of basis material decomposition in radiography after applying the designed method was also analyzed. It was concluded that the application of PASSSA results in a substantial improvement in basis material thickness estimation. Finally, based on the obtained simulated and experimental method evaluation results an analysis of perspective developments was also conducted.
Book Synopsis Scattering Correction in Cone Beam Tomography Using Continuously Thickness-adapted Kernels by : Navnina Bhatia
Download or read book Scattering Correction in Cone Beam Tomography Using Continuously Thickness-adapted Kernels written by Navnina Bhatia and published by . This book was released on 2016 with total page 0 pages. Available in PDF, EPUB and Kindle. Book excerpt: Advanced Cone Beam Computed Tomography (CBCT) typically uses a divergent conebeam source and a large area detector. As a result, there an inevitable increase in the size area of illumination causing an increase in the intensity of X-ray scatter signal, both from the object and the detector. This leads to the violation of prime assumption of reconstruction process which is based on straight line integrals path followed by the photons. Consequently scatter artifacts appear in the reconstruction images as steaks, cupping effect and thus produce wrong reconstruction values. Due to the severity of the reconstruction artifact caused by scatter, many scatter corrections methods have been adopted in literature. The first part of this study, reviews most of the existing scatter correction methods. The effect of scattering becomes more prominent and challenging in case of X-ray source of high energy which is used in industrial Non Destructive Testing (NDT), due to higher scatter to primary ratio (SPR). Therefore, in this study, we propose a continuously thickness-adapted deconvolution approach based on improvements in the Scatter Kernel Superposition (SKS) method. In this method, the scatter kernels are analytically parameterized over the whole thickness range of the object under study to better sample the amplitude and shape of kernels with respect to the thickness. The method is tested for both homogeneous and heterogeneous objects as well as simulated and experimental data. Another important aspect of this study is the comprehensive evaluation of contribution of the detector scatter performed using continuous method by separating the contribution of scatter due to the object and the detector. This is performed by modeling the scatter kernels using a four-Gaussian model. In the first approach, we performed this evaluation based on simulation of kernels from Monte Carlo simulations and the corrections are performed on typical industrial experimental data. The results obtained prove that the scatter correction only due to the object is not sufficient to obtain reconstruction image, free from artifacts, as the detector also scatters considerably. In order to prove this point experimentally and to have a better modeling of the detector, we describe a method based on combination of experiments and simulations to calculate the scatter kernels. The results obtained also prove, the contribution of the detector scattering becomes important and the PSF of the detector is not constant as considered in the studies so far, but it varies to a great extend with the energy spectrum.
Book Synopsis Correction Techniques in Emission Tomography by : Mohammad Dawood
Download or read book Correction Techniques in Emission Tomography written by Mohammad Dawood and published by CRC Press. This book was released on 2012-04-27 with total page 304 pages. Available in PDF, EPUB and Kindle. Book excerpt: Written by an interdisciplinary team of medical doctors, computer scientists, physicists, engineers, and mathematicians, Correction Techniques in Emission Tomography presents various correction methods used in emission tomography to generate and enhance images. It discusses the techniques from a computer science, mathematics, and physics viewpoint. The book gives a comprehensive overview of correction techniques at different levels of the data processing workflow. It covers nuclear medicine imaging, hybrid emission tomography (PET-CT, SPECT-CT, PET-MRI, PET-ultrasound), and optical imaging (fluorescence molecular tomography). It illustrates basic principles as well as recent advances, such as model-based iterative algorithms and 4D methods. An important aspect of the book is on new and sophisticated motion correction techniques in PET imaging. These techniques enable high-resolution, high-quality images, leading to better imaging analysis and image-based diagnostics. Reflecting state-of-the-art research, this volume explores the range of problems that occur in emission tomography. It looks at how the resulting images are affected and presents practical compensation methods to overcome the problems and improve the images.
Book Synopsis Quantitative Assessment of Scatter Correction Techniques Incorporated in Next Generation Dual-source Computed Tomography by : Sean David Mobberley
Download or read book Quantitative Assessment of Scatter Correction Techniques Incorporated in Next Generation Dual-source Computed Tomography written by Sean David Mobberley and published by . This book was released on 2013 with total page 75 pages. Available in PDF, EPUB and Kindle. Book excerpt: Density histograms were evaluated for the lung, tracheal, water and blood segments. Image data were obtained at 80, 100, 120, and 140 kVp in the SS mode (B35f kernel) and at 80, 100, 140, and 140-Sn (tin filtered) kVp in the DSDE mode (B35f and D30f kernels), in addition to variations in dose, rotation time, and pitch. To minimize the effect of cross-scatter, the phantom scans in the DSDE mode was obtained by reducing the tube current of one of the tubes to its minimum (near zero) value. When using image data obtained in the DSDE mode, the median HU values in the tracheal regions of all animals and the phantom were consistently closer to -1000 HU regardless of reconstruction kernel (chapters 3 and 4). Similarly, HU values of water and blood were consistently closer to their nominal values of 0 HU and 55 HU respectively.
Book Synopsis Scatter Correction of 4D Cone Beam Computed Tomography Images for Respiratory Phase-dependent Proton Dose Calculation by : Henning Peter Schmitz
Download or read book Scatter Correction of 4D Cone Beam Computed Tomography Images for Respiratory Phase-dependent Proton Dose Calculation written by Henning Peter Schmitz and published by . This book was released on 2023 with total page 0 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Book Synopsis Artifact Correction and Real-time Scatter Estimation for X-ray Computed Tomography in Industrial Metrology by : Joscha Maier
Download or read book Artifact Correction and Real-time Scatter Estimation for X-ray Computed Tomography in Industrial Metrology written by Joscha Maier and published by . This book was released on 2019* with total page 0 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Book Synopsis Photon Counting Computed Tomography by : Scott Hsieh
Download or read book Photon Counting Computed Tomography written by Scott Hsieh and published by Springer Nature. This book was released on 2023-05-27 with total page 271 pages. Available in PDF, EPUB and Kindle. Book excerpt: This book will provide readers with a good overview of some of most recent advances in the field of Photon Counting CT technology for X-ray medical imaging, especially as it pertains to new detectors. There will be a good mixture of general chapters in both technology and applications in CT medical imaging. The book will have an in-depth review of the research topics from world-leading specialists in the field. The conversion of the X-ray signal into analogue/digital value will be covered in some chapters. The authors also provide a review of CMOS chips for X-ray image sensors, methods of material discrimination and image reconstruction techniques. Covers a broad range of topics, including an introduction to novel spectral Computed Tomography; Includes in-depth analysis on how to optimize X-ray detection; Discusses analysis of electronics for X-ray detection.
Book Synopsis Compton Scattering Correction in the Quantification of Single Photon Emission Computed Tomography by : Qulu Chen
Download or read book Compton Scattering Correction in the Quantification of Single Photon Emission Computed Tomography written by Qulu Chen and published by . This book was released on 1991 with total page 344 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Book Synopsis Medical Imaging Systems by : Andreas Maier
Download or read book Medical Imaging Systems written by Andreas Maier and published by Springer. This book was released on 2018-08-02 with total page 263 pages. Available in PDF, EPUB and Kindle. Book excerpt: This open access book gives a complete and comprehensive introduction to the fields of medical imaging systems, as designed for a broad range of applications. The authors of the book first explain the foundations of system theory and image processing, before highlighting several modalities in a dedicated chapter. The initial focus is on modalities that are closely related to traditional camera systems such as endoscopy and microscopy. This is followed by more complex image formation processes: magnetic resonance imaging, X-ray projection imaging, computed tomography, X-ray phase-contrast imaging, nuclear imaging, ultrasound, and optical coherence tomography.
Book Synopsis Spectral, Photon Counting Computed Tomography by : Katsuyuki Taguchi
Download or read book Spectral, Photon Counting Computed Tomography written by Katsuyuki Taguchi and published by CRC Press. This book was released on 2020-07-14 with total page 446 pages. Available in PDF, EPUB and Kindle. Book excerpt: Spectral, Photon Counting Computed Tomography is a comprehensive cover of the latest developments in the most prevalent imaging modality (x-ray computed tomography (CT)) in its latest incarnation: Spectral, Dual-Energy, and Photon Counting CT. Disadvantages of the conventional single-energy technique used by CT technology are that different materials cannot be distinguished and that the noise is larger. To address these problems, a novel spectral CT concept has been proposed. Spectral Dual-Energy CT (DE-CT) acquires two sets of spectral data, and Spectral Photon Counting CT (PC-CT) detects energy of x-ray photons to reveal additional material information of objects by using novel energy-sensitive, photon-counting detectors. The K-edge imaging may be a gateway for functional or molecular CT. The book covers detectors and electronics, image reconstruction methods, image quality assessments, a simulation tool, nanoparticle contrast agents, and clinical applications for spectral CT.
Book Synopsis Industrial X-Ray Computed Tomography by : Simone Carmignato
Download or read book Industrial X-Ray Computed Tomography written by Simone Carmignato and published by Springer. This book was released on 2017-10-18 with total page 372 pages. Available in PDF, EPUB and Kindle. Book excerpt: X-ray computed tomography has been used for several decades as a tool for measuring the three-dimensional geometry of the internal organs in medicine. However, in recent years, we have seen a move in manufacturing industries for the use of X-ray computed tomography; first to give qualitative information about the internal geometry and defects in a component, and more recently, as a fully-quantitative technique for dimensional and materials analysis. This trend is primarily due to the ability of X-ray computed tomography to give a high-density and multi-scale representation of both the external and internal geometry of a component, in a non-destructive, non-contact and relatively fast way. But, due to the complexity of X-ray computed tomography, there are remaining metrological issues to solve and the specification standards are still under development. This book will act as a one-stop-shop resource for students and users of X-ray computed tomography in both academia and industry. It presents the fundamental principles of the technique, detailed descriptions of the various components (hardware and software), current developments in calibration and performance verification and a wealth of example applications. The book will also highlight where there is still work to do, in the perspective that X-ray computed tomography will be an essential part of Industry 4.0.
Author :Rutao Yao Publisher :National Library of Canada = Bibliothèque nationale du Canada ISBN 13 :9780612264052 Total Pages :294 pages Book Rating :4.2/5 (64 download)
Book Synopsis Development of Multispectral Scatter Correction Techniques for High-resolution Positron Emission Tomography [microform] by : Rutao Yao
Download or read book Development of Multispectral Scatter Correction Techniques for High-resolution Positron Emission Tomography [microform] written by Rutao Yao and published by National Library of Canada = Bibliothèque nationale du Canada. This book was released on 1997 with total page 294 pages. Available in PDF, EPUB and Kindle. Book excerpt:
![Download Development of Multispectral Scatter Correction Techniques for High-resolution Positron Emission Tomography [microform] PDF Online Free](https://books.google.com/books/content/images/frontcover/hLI9QwAACAAJ?fife=w200-h370)
