Download or read book Motion Correction of Positron Emission Tomography Data by a Magnetic Resonance Imaging Derived Model written by Thomas Küstner and published by . This book was released on 2017 with total page pages. Available in PDF, EPUB and Kindle. Book excerpt:

Download or read book Motion Correction in Thoracic Positron Emission Tomography written by Fabian Gigengack and published by Springer. This book was released on 2014-09-10 with total page 98 pages. Available in PDF, EPUB and Kindle. Book excerpt: Respiratory and cardiac motion leads to image degradation in Positron Emission Tomography (PET), which impairs quantification. In this book, the authors present approaches to motion estimation and motion correction in thoracic PET. The approaches for motion estimation are based on dual gating and mass-preserving image registration (VAMPIRE) and mass-preserving optical flow (MPOF). With mass-preservation, image intensity modulations caused by highly non-rigid cardiac motion are accounted for. Within the image registration framework different data terms, different variants of regularization and parametric and non-parametric motion models are examined. Within the optical flow framework, different data terms and further non-quadratic penalization are also discussed. The approaches for motion correction particularly focus on pipelines in dual gated PET. A quantitative evaluation of the proposed approaches is performed on software phantom data with accompanied ground-truth motion information. Further, clinical applicability is shown on patient data. The book concludes with an outlook of recent developments and potential future advances in the field of PET motion correction.

Download or read book PET MRI Advances in Instrumentation and Quantitative Procedures An Issue of PET Clinics E Book written by Habib Zaidi and published by Elsevier Health Sciences. This book was released on 2016-04-05 with total page 129 pages. Available in PDF, EPUB and Kindle. Book excerpt: This issue of PET Clinics focuses on PET/MRI: Advances in Instrumentation and Quantitative Procedures. Articles will include: Advances in clinical PET/MRI instrumentation; Magnetic resonance imaging-guided attenuation correction of positron emission tomography data in PET/MRI; Magnetic resonance imaging-guided partial volume correction of positron emission tomography data in PET/MRI; Magnetic resonance imaging-guided derivation of the input function for PET kinetic modeling; Innovations in small-animal PET/MRI instrumentation; Dual-modal PET/MRI molecular imaging probes; Magnetic resonance imaging-guided motion compensation of positron emission tomography data in PET/MRI; Attenuation correction for MR coils in combined PET/MR imaging; and more!

Download or read book Magnetic Resonance Imaging Based Correction and Reconstruction of Positron Emission Tomography Images written by Jonathan David Oakley and published by . This book was released on 2000 with total page 267 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Download or read book Hybrid MR PET Imaging written by N Jon Shah and published by Royal Society of Chemistry. This book was released on 2018-12-04 with total page 430 pages. Available in PDF, EPUB and Kindle. Book excerpt: The combination of two leading imaging techniques – magnetic resonance imaging and positron emission tomography – is poised to have a large impact and has recently been a driver of research and clinical applications. The hybrid instrument is capable of acquiring both datasets simultaneously and this affords a number of advantages ranging from the obvious, two datasets acquired in the time required for one, through to novel applications. This book describes the basics of MRI and PET and then the technical issues and advantages involved in bringing together the two techniques. Novel applications in preclinical settings, human imaging and tracers are described. The book is for students and scientists entering the field of MR–PET with an MRI background but lacking PET or vice versa. It provides practical details from experts working in the area.

Download or read book PET MRI written by Ignasi Carrio and published by Springer Science & Business Media. This book was released on 2013-12-09 with total page 165 pages. Available in PDF, EPUB and Kindle. Book excerpt: In compiling this textbook on the exciting novel imaging modality of PET/MRI, the editors have brought together a truly international group of experts in the field. The book is divided into two parts. The first part covers methodology and equipment and includes chapters on basic molecular medicine, contrast agents, MR attenuation and validation, and quantitative MRI and PET motion correction. The second part of the book focuses on clinical applications in oncology, cardiology, and neurology. Imaging of major neoplasms is covered in a series of individual chapters. Further chapters address functional and metabolic cardiovascular examinations and major central nervous system applications such as brain tumors and dementias. This book will be of interest to all radiologists and nuclear medicine physicians who wish to learn more about the latest developments in this important emerging imaging modality and its applications.

Download or read book Motion compensated Image Reconstruction for Magnetic Resonance MR Imaging and for Simultaneous Positron Emission Tomography MR Imaging written by Christopher M. Rank and published by . This book was released on 2016 with total page pages. Available in PDF, EPUB and Kindle. Book excerpt:

Download or read book MR assisted PET Data Optimization for Simultaneous Dual modality Imaging in Dementia written by Kevin Tze-Hsiang Chen and published by . This book was released on 2017 with total page 155 pages. Available in PDF, EPUB and Kindle. Book excerpt: Recent advances have allowed the hardware integration of positron emission tomography (PET) and magnetic resonance imaging (MRI). The spatiotemporally correlated data acquisition opened up opportunities for numerous applications. Furthermore, the MRI data can be utilized to improve the PET scanner performance. While PET has many advantages, including the fact that it could provide a quantitative means to assess in vivo biological processes, its accuracy is confounded by several factors. For example, attenuation correction is required to account for the interactions of the annihilation photons in the subject; motion correction is needed to minimize image degradation due to subject movements; partial volume effects correction is required due to the relatively limited spatial resolution. Although many applications could benefit from these methodological improvements, in this thesis we focused on dementia. MRI and PET are widely used and provide complementary information in the assessment of these patients. Equally important, dementia is a great test situation for these methodological developments because the confounding factors mentioned above are especially pronounced in this patient population. In this work, we developed a unified protocol to address these limitations, an approach we termed MR-assisted PET data optimization. Specifically, we first developed methods to derive head attenuation maps from the morphological MR images. Next, we used temporally-correlated MR data for PET motion compensation and spatially-correlated MR data for anatomy-aided reconstruction. Finally, we demonstrated that after applying these tools to data acquired in dementia patients the PET data quantification was positively impacted and the image quality improved substantially..

Download or read book PET MRI in Oncology written by Andrei Iagaru and published by Springer. This book was released on 2018-01-23 with total page 435 pages. Available in PDF, EPUB and Kindle. Book excerpt: In this book, experts from premier institutions across the world with extensive experience in the field clearly and succinctly describe the current and anticipated uses of PET/MRI in oncology. The book also includes detailed presentations of the MRI and PET technologies as they apply to the combined PET/MRI scanners. The applications of PET/MRI in a wide range of oncological settings are well documented, highlighting characteristic findings, advantages of this dual-modality technique, and pitfalls. Whole-body PET/MRI applications and pediatric oncology are discussed separately. In addition, information is provided on PET technology designs and MR hardware for PET/MRI, MR pulse sequences and contrast agents, attenuation and motion correction, the reliability of standardized uptake value measurements, and safety considerations. The balanced presentation of clinical topics and technical aspects will ensure that the book is of wide appeal. It will serve as a reference for specialists in nuclear medicine and radiology and oncologists and will also be of interest for residents in these fields and technologists.

Download or read book Clinical PET and PET CT written by H. Jadvar and published by Springer Science & Business Media. This book was released on 2006-01-20 with total page 277 pages. Available in PDF, EPUB and Kindle. Book excerpt: A practical manual covering the full spectrum of PET and PET/CT imaging, now in common clinical practice, this book includes images of normal variants, artifacts, and pathologic conditions. Indications for and the relative clinical value of PET in the armamentarium of diagnostic medical imaging are reviewed. The information in the book is organized to be brief, concise, easy-to-understand and readily accessed. This book is intended for all health practitioners who need a concise reference and review of PET imaging indications, protocols and clinical applications. It will be useful to radiologists, nuclear medicine physicians, and clinicians who refer their patients to PET Centers for diagnostic imaging, including neurologists, neurosurgeons, psychiatrists, cardiologists, internists, and oncologists. Radiologic and nuclear medicine technologists, and physicians in training will also benefit from this work.

Download or read book Development of a Motion Correction and Partial Volume Correction Algorithm for High Resolution Imaging in Positron Emission Tomography written by Shailendra Hemun Segobin and published by . This book was released on 2012 with total page pages. Available in PDF, EPUB and Kindle. Book excerpt:

Download or read book Comprehensive Head Motion Correction For Functional Magnetic Resonance Imaging written by Zahra Faraji-Dana and published by . This book was released on 2017 with total page pages. Available in PDF, EPUB and Kindle. Book excerpt: Head motion artifacts are major confounds that limit use of functional magnetic resonance imaging (fMRI) in neuroscience research and clinical settings. Prospective motion correction is a promising candidate solution for head motion in fMRI that ideally allows the image plane to remain fixed with respect to the moving head (i.e., in the moving reference frame). Prospective motion correction has been shown to correct successfully for rigid body movement artifacts, but residual geometric distortion due to dynamic magnetic field nonuniformities and dynamic changes in receiver coil sensitivity profiles in the moving reference frame still remain a problem. This thesis focuses on three objectives. First, I investigated and corrected for the influence of respiratory effects on the performance of dynamic geometric correction using Phase Labeling for Additional Coordinate Encoding (PLACE). It was demonstrated that PLACE combined with the dynamic off-resonance in k-space (DORK) method, and temporal averaging substantially improved fMRI data quality in comparison to the results obtained by standard processing and static geometric distortion correction. Second, I verified that appreciable signal artifacts occur due to coil sensitivity changes in fMRI maps in presence of overt head motion with prospective motion correction using Prospective Acquisition CorrEction (PACE) technique [1]. Sensitivity map compensations were shown to suppress these artifacts and provide improved fMRI results Third, I studied signal artifacts resulted from the head motion between the coil sensitivity map measurement (i.e., the calibration step) and data acquisition for fMRI with parallel-imaging reconstruction methods using two parallel imaging schemes: sensitivity encoding (SENSE) and generalized autocalibrating partially parallel acquisitions (GRAPPA) with acceleration factors 2 and 4. Coil sensitivity map compensations were shown to improve fMRI results obtained with PACE in the presence of overt head motion compared to those obtained with no overt head motion. Overall, prospective motion correction, integrated dynamic geometric distortion correction, and coil sensitivity map correction present an appealing compound approach for suppressing rigid and non-rigid motion artifacts during fMRI. This thesis has developed robust and comprehensive head motion correction strategies that ultimately will expand the patient populations for which fMRI can be performed robustly.

Download or read book Motion Correction Techniques for Magnetic Resonance Imaging written by Edward Brian Welch and published by . This book was released on 2003 with total page 318 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Download or read book Motion Correction and Reduction Techniques in Magnetic Resonance Imaging written by Hope Waggener Korin and published by . This book was released on 1991 with total page 334 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Download or read book Hybrid Cardiac Imaging written by Stephan G. Nekolla and published by . This book was released on 2022 with total page 0 pages. Available in PDF, EPUB and Kindle. Book excerpt: This clinically oriented book provides an up-to-date review on the various hybrid imaging modalities that may be employed for the purpose of cardiac imaging. After discussion of generic aspects of hybrid imaging, SPECT/CT, PET/CT, and PET/MRI are each considered in depth. In addition, information is provided on upcoming technologies, such as dedicated so-called fast cardiac cameras (CZT detector technology) and novel probes and radiotracers. A wide variety of topics are addressed, including important technological aspects, possible applications, imaging protocols, peculiarities of the available modalities, radiation exposure, and dose reduction. Last but not least, an estimation of the cost efficiency of dedicated and hybrid imaging devices in cardiology is provided and possible scenarios with respect to health care economics are envisioned. Hybrid Cardiac Imaging will be of particular value for nuclear medicine specialists, cardiologists, and radiologists and will also be of interest to medical physicists, medical technicians, and cardiothoracic surgeons. .

Download or read book Partial volume Correction for High resolution Positron Emission Tomography Using Cortical Surface Information written by Thomas Funck and published by . This book was released on 2014 with total page pages. Available in PDF, EPUB and Kindle. Book excerpt: " Images from high resolution brain positron emission tomography (PET) scanners (CTI/Siemens HRRT) can measure differences in neuroreceptor concentrations in the gray matter that are related to cytoarchitectonic differences. However, the loss of resolution due to the PET imaging process results in partial-volume effects (PVE) that obscure the true radiotracer distribution. Although several partial-volume correction algorithms exist, these frequently require severely limiting assumptions. We developed a new iterative deconvolution algorithm for the partial-volume correction of PET images that aims to overcome the limitations of previous methods. The proposed method does so using two innovative techniques. One is the incorporation anatomic information from a cortical gray matter surface representation, extracted from magnetic resonance imaging (MRI). The second is the use of anatomically constrained smoothing to attenuate noise in the image. This method was validated using simulated and clinical data. The results show that our method consistently recovers accurate radiotracer concentrations on simulated data sets and produces similar, though slightly overestimated, results on the real clinical data when compared to the gold-standard partial-volume correction method. " --

Download or read book Detection and Correction of Patient Motion in Magnetic Resonance Imaging written by Murat Aksoy and published by . This book was released on 2010 with total page pages. Available in PDF, EPUB and Kindle. Book excerpt: Due to the sequential nature of magnetic resonance imaging (MRI) data acquisition, correction of image artifacts originating from involuntary patient motion is essential for reliable diagnostic quality. Especially during MRI scans of certain patient populations such as children, elderly or patients with certain medical conditions (e.g. stroke, Parkinson's), motion correction methods must be incorporated into the MR imaging protocol for adequate image quality. With increased demands for higher resolution or time-resolved examinations (e.g. functional MRI), examination times also increase and even willing patients might have trouble staying still during the course of the examination. The first part of this thesis provides a method for retrospective correction of head motion artifacts using a multi-shot spiral-in \ & out readout and parallel-imaging based iterative image reconstruction. The spiral-in part provided a low resolution image that was used for measurement of head motion. Due to rotational motion, locally undersampled areas appear in MR acquisition space (i.e., k-space), which violate the Nyquist theorem and cause artifacts even after motion correction. These artifacts were addressed through the data redundancy provided by multiple receiver channels that is present in modern receiver coils and an iterative conjugate-gradient based reconstruction. This method was then applied to diffusion tensor imaging (DTI) with multi-shot readout. Since DTI uses directional gradients to encode diffusion, rotational motion causes the image contrast to change, and it becomes incorrect to combine data with varying diffusion encodings on them. To address this issue, a non-linear conjugate gradient based reconstruction is presented and it is shown that this method provided more accurate description of white matter pathways compared to traditional methods. In the second part of this thesis, a prospective motion correction system using an optical tracking device is presented. Such systems are preferable compared to retrospective navigator-based methods due to various reasons, such as ability to perform motion correction independent of the MR data acquisition and immunity to spin history effects. The system proposed used a single camera mounted on the head coil and a self-encoded checkerboard marker mounted on the patient's forehead. Results on structural and diffusion imaging revealed that prospective motion correction outperforms retrospective navigator-based schemes. In the last part of the thesis, entropy-based retrospective autofocusing was used in combination with motion data obtained from prospective tracking to remove residual motion artifacts in the images. This method was especially useful for removing errors caused by inaccurate cross-calibration between the scanner and camera frame-of-references. It was also shown that prospective tracking can be the enabling technology for autofocusing in 3D acquisitions.