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Coregistration

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https://www.readbyqxmd.com/read/29130334/pulsed-epr-imaging-applications-in-the-studies-of-tumor-physiology
#1
Shun Kishimoto, Ken-Ichiro Matsumoto, Keita Saito, Ayano Enomoto, Shingo Matsumoto, James Mitchell, Nallathamby Devasahayam, Murali C Krishna
SIGNIFICANCE: Electron Paramagnetic Resonance imaging (EPRI) is a powerful technique capable of generating images of tissue oxygenation using exogenous paramagnetic probes such as trityl radicals or nitroxyl radicals. Using principles similar to Magnetic Resonance Imaging (MRI) with field gradients, the spatial distribution of the paramagnetic probecan be generatedand,from its spectral features, spatial maps of oxygen can be obtained from live objects. In this review, two methods of signal acquisition, image formation/reconstruction will be described...
November 12, 2017: Antioxidants & Redox Signaling
https://www.readbyqxmd.com/read/29124128/vascular-deformation-mapping-vdm-of-thoracic-aortic-enlargement-in-aneurysmal-disease-and-dissection
#2
Nicholas S Burris, Benjamin A Hoff, Ella A Kazerooni, Brian D Ross
Thoracic aortic aneurysm is a common and lethal disease that requires regular imaging surveillance to determine timing of surgical repair and prevent major complications such as rupture. Current cross-sectional imaging surveillance techniques, largely based on computed tomography angiography, are focused on measurement of maximal aortic diameter, although this approach is limited to fixed anatomic positions and is prone to significant measurement error. Here we present preliminary results showing the feasibility of a novel technique for assessing change in aortic dimensions, termed vascular deformation mapping (VDM)...
September 2017: Tomography: a Journal for Imaging Research
https://www.readbyqxmd.com/read/29076331/an-evaluation-of-the-benefits-of-simultaneous-acquisition-on-pet-mr-coregistration-in-head-neck-imaging
#3
Serena Monti, Carlo Cavaliere, Mario Covello, Emanuele Nicolai, Marco Salvatore, Marco Aiello
Coregistration of multimodal diagnostic images is crucial for qualitative and quantitative multiparametric analysis. While retrospective coregistration is computationally intense and could be inaccurate, hybrid PET/MR scanners allow acquiring implicitly coregistered images. Aim of this study is to assess the performance of state-of-the-art coregistration methods applied to PET and MR acquired as single modalities, comparing the results with the implicitly coregistration of a hybrid PET/MR, in complex anatomical regions such as head/neck (HN)...
2017: Journal of Healthcare Engineering
https://www.readbyqxmd.com/read/29065582/an-evaluation-of-the-benefits-of-simultaneous-acquisition-on-pet-mr-coregistration-in-head-neck-imaging
#4
Serena Monti, Carlo Cavaliere, Mario Covello, Emanuele Nicolai, Marco Salvatore, Marco Aiello
Coregistration of multimodal diagnostic images is crucial for qualitative and quantitative multiparametric analysis. While retrospective coregistration is computationally intense and could be inaccurate, hybrid PET/MR scanners allow acquiring implicitly coregistered images. Aim of this study is to assess the performance of state-of-the-art coregistration methods applied to PET and MR acquired as single modalities, comparing the results with the implicitly coregistration of a hybrid PET/MR, in complex anatomical regions such as head/neck (HN)...
2017: Journal of Healthcare Engineering
https://www.readbyqxmd.com/read/29040022/added-value-of-a-single-fast-20-second-deep-inspiration-breath-hold-acquisition-in-fdg-pet-ct-in-the-assessment-of-lung-nodules
#5
Nicolas Balamoutoff, Benjamin Serrano, Florent Hugonnet, Nicolas Garnier, Benoît Paulmier, Marc Faraggi
Purpose To compare the accuracy of a single 20-second deep-inspiration breath hold (DIBH) in fluorodeoxyglucose (FDG) positron emission tomography (PET)/computed tomography (CT) to that with conventional free-breathing (FB) whole-body PET/CT for the assessment, characterization, and quantification of lung lesions in terms of the blurring effect of respiratory motion. Materials and Methods Institutional review board approval was obtained, and the requirement to obtain informed consent was waived. A preclinical study was performed in a test population of 19 patients to evaluate the feasibility and consistency of DIBH techniques compared with phase-based respiratory gating (PBRG)...
October 17, 2017: Radiology
https://www.readbyqxmd.com/read/29036058/nonrigid-synthetic-aperture-radar-and-optical-image-coregistration-by-combining-local-rigid-transformations-using-a-kohonen-network
#6
Mehdi Salehpour, Alireza Behrad
This study proposes a new algorithm for nonrigid coregistration of synthetic aperture radar (SAR) and optical images. The proposed algorithm employs point features extracted by the binary robust invariant scalable keypoints algorithm and a new method called weighted bidirectional matching for initial correspondence. To refine false matches, we assume that the transformation between SAR and optical images is locally rigid. This property is used to refine false matches by assigning scores to matched pairs and clustering local rigid transformations using a two-layer Kohonen network...
October 1, 2017: Journal of the Optical Society of America. A, Optics, Image Science, and Vision
https://www.readbyqxmd.com/read/29021314/augmented-3d-venous-navigation-for-neuroendovascular-procedures
#7
Raphaël Blanc, Robert Fahed, Pascal Roux, Stanislas Smajda, Gabriele Ciccio, Jean-Philippe Desilles, Hocine Redjem, Mikael Mazighi, Humain Baharvahdat, Michel Piotin
BACKGROUND: Endovascular venous access is increasingly used for the treatment of many cerebrovascular diseases. The quality of venous roadmapping through arterial injection can be problematic because of contrast media dilution, slow flow velocity, and unilateral opacification of the venous system. OBJECTIVE: To describe our experience with the VesselNavigator (Philips Healthcare, Best, The Netherlands) in performing live 3D roadmapping for intracranial venous procedures...
October 11, 2017: Journal of Neurointerventional Surgery
https://www.readbyqxmd.com/read/28940997/real-time-optical-coherence-tomography-coregistration-with-angiography-in-percutaneous-coronary-intervention-impact-on-physician-decision-making-the-optico-integration-study
#8
David M Leistner, Matthias Riedel, Lisa Steinbeck, Barbara E Stähli, Georg M Fröhlich, Alexander Lauten, Carsten Skurk, Hans-Christian Mochmann, Laura Lübking, Ursula Rauch-Kröhnert, Renate B Schnabel, Dirk Westermann, Stefan Blankenberg, Ulf Landmesser
AIMS: Intracoronary optical coherence tomography (OCT) imaging allows for high-resolution characterization of coronary lesions. Difficulties in matching cross-sectional OCT-images with angiographic lesion localization may limit optimal clinical utilization. We sought to prospectively assess the impact of a novel system of real-time OCT coregistration with angiography (ACR) on physician decision-making during percutaneous coronary interventions (PCI). METHODS AND RESULTS: Strategy for PCI (stent - length, - diameter, - strategy, landing zone) and PCI-optimization (stent-malappostion, -underexpansion, edge-dissections, geographical mismatch) was prospectively assessed in 50 patients with 58 coronary lesions after (I) angiography, (II) OCT imaging, and (III) ACR...
September 20, 2017: Catheterization and Cardiovascular Interventions
https://www.readbyqxmd.com/read/28901055/phantom-based-image-quality-test-methods-for-photoacoustic-imaging-systems
#9
William C Vogt, Congxian Jia, Keith A Wear, Brian S Garra, T Joshua Pfefer
As photoacoustic imaging (PAI) technologies advance and applications arise, there is increasing need for standardized approaches to provide objective, quantitative performance assessment at various stages of the product development and clinical translation process. We have developed a set of performance test methods for PAI systems based on breast-mimicking tissue phantoms containing embedded inclusions. Performance standards for mature imaging modalities [magnetic resonance imaging (MRI), computed tomography (CT), and ultrasound] were used to guide selection of critical PAI image quality characteristics and experimental methods...
September 2017: Journal of Biomedical Optics
https://www.readbyqxmd.com/read/28862352/geometric-distortion-correction-in-prostate-diffusion-weighted-mri-and-its-effect-on-quantitative-apparent-diffusion-coefficient-analysis
#10
Gabriel Nketiah, Kirsten M Selnaes, Elise Sandsmark, Jose R Teruel, Brage Krüger-Stokke, Helena Bertilsson, Tone F Bathen, Mattijs Elschot
PURPOSE: To evaluate the effect of correction for B0 inhomogeneity-induced geometric distortion in echo-planar diffusion-weighted imaging on quantitative apparent diffusion coefficient (ADC) analysis in multiparametric prostate MRI. METHODS: Geometric distortion correction was performed in echo-planar diffusion-weighted images (b = 0, 50, 400, 800 s/mm(2) ) of 28 patients, using two B0 scans with opposing phase-encoding polarities. Histology-matched tumor and healthy tissue volumes of interest delineated on T2 -weighted images were mapped to the nondistortion-corrected and distortion-corrected data sets by resampling with and without spatial coregistration...
September 1, 2017: Magnetic Resonance in Medicine: Official Journal of the Society of Magnetic Resonance in Medicine
https://www.readbyqxmd.com/read/28840171/estimation-of-subject-coregistration-errors-during-multimodal-preclinical-imaging-using-separate-instruments-origins-and-avoidance-of-artifacts
#11
Jean-Philippe Dillenseger, Christian Goetz, Amira Sayeh, Chris Healy, Isabelle Duluc, Jean-Noël Freund, André Constantinesco, Gaëlle Aubertin-Kirch, Philippe Choquet
We use high-resolution [Formula: see text] data in multiple experiments to estimate the sources of error during coregistration of images acquired on separate preclinical instruments. In combination with experiments with phantoms, we completed in vivo imaging on mice, aimed at identifying the possible sources of registration errors, caused either by transport of the animal, movement of the animal itself, or methods of coregistration. The same imaging cell was used as a holder for phantoms and animals. For all procedures, rigid coregistration was carried out using a common landmark coregistration system, placed inside the imaging cell...
July 2017: Journal of Medical Imaging
https://www.readbyqxmd.com/read/28815472/comparison-of-pet-ct-and-whole-mount-histopathology-sections-of-the-human-prostate-a-new-strategy-for-voxel-wise-evaluation
#12
F Schiller, T Fechter, C Zamboglou, A Chirindel, N Salman, C A Jilg, V Drendel, M Werner, P T Meyer, A-L Grosu, M Mix
BACKGROUND: Implementation of PET/CT in diagnosis of primary prostate cancer (PCa) requires a profound knowledge about the tracer, preferably from a quantitative evaluation. Direct visual comparison of PET/CT slices to whole prostate sections is hampered by considerable uncertainties from imperfect coregistration and fundamentally different image modalities. In the current study, we present a novel method for advanced voxel-wise comparison of histopathology from excised prostates to pre-surgical PET...
August 17, 2017: EJNMMI Physics
https://www.readbyqxmd.com/read/28799683/positron-emission-tomography-imaging-in-gliomas-applications-in-clinical-diagnosis-for-assessment-of-prognosis-and-of-treatment-effects-and-for-detection-of-recurrences
#13
REVIEW
W-D Heiss
Neuroimaging plays a significant role in the diagnosis of intracranial tumours, especially brain gliomas, and must consist of an assessment of location and extent of the tumour and of its biological activity. Therefore, morphological imaging modalities and functional, metabolic or molecular imaging modalities should be combined for primary diagnosis and for following the course and evaluating therapeutic effects. Magnetic resonance imaging (MRI) is the gold standard for providing detailed morphological information and can supply some additional insights into metabolism (MR spectroscopy) and perfusion (perfusion-weighted imaging) but still has limitations in identifying tumour grade, invasive growth into neighbouring tissue and treatment-induced changes, as well as recurrences...
August 11, 2017: European Journal of Neurology: the Official Journal of the European Federation of Neurological Societies
https://www.readbyqxmd.com/read/28752807/objective-assessment-of-listening-effort-coregistration-of-pupillometry-and-eeg
#14
Kelly Miles, Catherine McMahon, Isabelle Boisvert, Ronny Ibrahim, Peter de Lissa, Petra Graham, Björn Lyxell
Listening to speech in noise is effortful, particularly for people with hearing impairment. While it is known that effort is related to a complex interplay between bottom-up and top-down processes, the cognitive and neurophysiological mechanisms contributing to effortful listening remain unknown. Therefore, a reliable physiological measure to assess effort remains elusive. This study aimed to determine whether pupil dilation and alpha power change, two physiological measures suggested to index listening effort, assess similar processes...
January 2017: Trends in Hearing
https://www.readbyqxmd.com/read/28745021/the-impact-of-t1-versus-epi-spatial-normalization-templates-for-fmri-data-analyses
#15
Vince D Calhoun, Tor D Wager, Anjali Krishnan, Keri S Rosch, Karen E Seymour, Mary Beth Nebel, Stewart H Mostofsky, Prashanth Nyalakanai, Kent Kiehl
Spatial normalization of brains to a standardized space is a widely used approach for group studies in functional magnetic resonance imaging (fMRI) data. Commonly used template-based approaches are complicated by signal dropout and distortions in echo planar imaging (EPI) data. The most widely used software packages implement two common template-based strategies: (1) affine transformation of the EPI data to an EPI template followed by nonlinear registration to an EPI template (EPInorm) and (2) affine transformation of the EPI data to the anatomic image for a given subject, followed by nonlinear registration of the anatomic data to an anatomic template, which produces a transformation that is applied to the EPI data (T1norm)...
November 2017: Human Brain Mapping
https://www.readbyqxmd.com/read/28744192/macroanatomical-landmarks-featuring-junctions-of-major-sulci-and-fissures-and-scalp-landmarks-based-on-the-international-10-10-system-for-analyzing-lateral-cortical-development-of-infants
#16
Daisuke Tsuzuki, Fumitaka Homae, Gentaro Taga, Hama Watanabe, Mie Matsui, Ippeita Dan
The topographic relationships between the macroanatomical structure of the lateral cortex, including sulci and fissures, and anatomical landmarks on the external surface of the head are known to be consistent. This allows the coregistration of EEG electrodes or functional near-infrared spectroscopy over the scalp with underlying cortical regions. However, limited information is available as to whether the topographic relationships are maintained in rapidly developing infants, whose brains and heads exhibit drastic growth...
2017: Frontiers in Neuroscience
https://www.readbyqxmd.com/read/28721357/whole-mouse-brain-imaging-using-optical-coherence-tomography-reconstruction-normalization-segmentation-and-comparison-with-diffusion-mri
#17
Joël Lefebvre, Alexandre Castonguay, Philippe Pouliot, Maxime Descoteaux, Frédéric Lesage
An automated massive histology setup combined with an optical coherence tomography (OCT) microscope was used to image a total of [Formula: see text] whole mouse brains. Each acquisition generated a dataset of thousands of OCT volumetric tiles at a sampling resolution of [Formula: see text]. This paper describes techniques for reconstruction and segmentation of the sliced brains. In addition to the measured OCT optical reflectivity, a single scattering photon model was used to compute the attenuation coefficients within each tissue slice...
October 2017: Neurophotonics
https://www.readbyqxmd.com/read/28675110/metabolic-regional-and-network-changes-in-alzheimer-s-disease-subtypes
#18
Karl Herholz, Cathleen Haense, Alex Gerhard, Matthew Jones, José Anton-Rodriguez, Shailendra Segobin, Julie S Snowden, Jennifer C Thompson, Christopher Kobylecki
Clinical variants of Alzheimer's disease (AD) include the common amnestic subtype as well as subtypes characterised by leading visual processing impairments or by multimodal neurocognitive deficits. We investigated regional metabolic patterns and networks between AD subtypes. The study comprised 9 age-matched controls and 25 patients with mild to moderate AD. Methods included clinical and neuropsychological assessment, high-resolution FDG PET and T1-weighted 3D MR imaging with PET-MR coregistration, grey matter segmentation, atlas-based regions-of-interest, linear mixed effects and regional correlation analysis...
January 1, 2017: Journal of Cerebral Blood Flow and Metabolism
https://www.readbyqxmd.com/read/28658939/use-of-stereovision-for-intraoperative-coregistration-of-a-spinal-surgical-field-a-human-feasibility-study
#19
S Scott Lollis, Xiaoyao Fan, Linton Evans, Jonathan D Olson, Keith D Paulsen, David W Roberts, Sohail K Mirza, Songbai Ji
BACKGROUND: The use of image guidance during spinal surgery has been limited by several anatomic factors such as intervertebral segment motion and ineffective spine immobilization. In its current form, the surgical field is coregistered with a preoperative computed tomography (CT), often obtained in a different spinal confirmation, or with intraoperative cross-sectional imaging. Stereovision offers an alternative method of registration. OBJECTIVE: To demonstrate the feasibility of stereovision-mediated coregistration of a human spinal surgical field using a proof-of-principle study, and to provide preliminary assessments of the technique's accuracy...
June 27, 2017: Neurosurgery
https://www.readbyqxmd.com/read/28643043/-18-f-florbetaben-pet-beta-amyloid-binding-expressed-in-centiloids
#20
Christopher C Rowe, Vincent Doré, Gareth Jones, David Baxendale, Rachel S Mulligan, Santiago Bullich, Andrew W Stephens, Susan De Santi, Colin L Masters, Ludger Dinkelborg, Victor L Villemagne
PURPOSE: The Centiloid (CL) method enables quantitative values from Aβ-amyloid (Aβ) imaging to be expressed in a universal unit providing pathological, diagnostic and prognostic thresholds in clinical practice and research and allowing integration of multiple tracers and methods. The method was developed for (11)C-PiB scans with zero CL set as the average in young normal subjects and 100 CL the average in subjects with mild Alzheimer's disease (AD). The method allows derivation of equations to convert the uptake value of any tracer into the same standard CL units but first requires head-to-head comparison with (11)C-PiB results...
November 2017: European Journal of Nuclear Medicine and Molecular Imaging
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