keyword
MENU ▼
Read by QxMD icon Read
search

Image registration

keyword
https://www.readbyqxmd.com/read/28102961/assessing-the-use-of-4dct-ventilation-in-pre-operative-surgical-lung-cancer-evaluation
#1
Yevgeniy Vinogradskiy, Matthew Jackson, Leah Schubert, Bernard Jones, Richard Castillo, Edward Castillo, Thomas Guerrero, John Mitchell, Chad Rusthoven, Moyed Miften, Brian Kavanagh
PURPOSE: A primary treatment option for lung cancer patients is surgical resection. Patients who have poor lung function prior to surgery are at increased risk of developing serious and life-threatening complications after surgical resection. Surgeons use nuclear medicine ventilation-perfusion (VQ) scans along with pulmonary function test (PFT) information to assess a patient's pre-surgical lung function. The nuclear medicine images and pre-surgery PFTs are used to calculate percent predicted postoperative (%PPO) PFT values by estimating the amount of functioning lung tissue that would be lost with surgical resection...
January 2017: Medical Physics
https://www.readbyqxmd.com/read/28102960/nine-degrees-of-freedom-flexmap-for-a-cone-beam-computed-tomography-imaging-device-with-independently-movable-source-and-detector
#2
Peter Keuschnigg, Daniel Kellner, Karl Fritscher, Andrea Zechner, Ulrich Mayer, Philipp Huber, Felix Sedlmayer, Heinz Deutschmann, Philipp Steininger
PURPOSE: Couch-mounted cone-beam computed tomography (CBCT) imaging devices with independently rotatable x-ray source and flat-panel detector arms for acquisitions of arbitrary regions of interest (ROI) have recently been introduced in image-guided radiotherapy (IGRT). This work analyzes mechanical limitations and gravity-induced effects influencing the geometric accuracy of images acquired with arbitrary angular constellations of source and detector in nonisocentric trajectories, which is considered essential for IGRT...
January 2017: Medical Physics
https://www.readbyqxmd.com/read/28102945/learning-based-deformable-image-registration-for-infant-mr-images-in-the-first-year-of-life
#3
Shunbo Hu, Lifang Wei, Yaozong Gao, Yanrong Guo, Guorong Wu, Dinggang Shen
PURPOSE: Many brain development studies have been devoted to investigate dynamic structural and functional changes in the first year of life. To quantitatively measure brain development in such a dynamic period, accurate image registration for different infant subjects with possible large age gap is of high demand. Although many state-of-the-art image registration methods have been proposed for young and elderly brain images, very few registration methods work for infant brain images acquired in the first year of life, because of (a) large anatomical changes due to fast brain development and (b) dynamic appearance changes due to white-matter myelination...
January 2017: Medical Physics
https://www.readbyqxmd.com/read/28102196/whole-brain-3d-mapping-of-human-neural-transplant-innervation
#4
Jonas Doerr, Martin Karl Schwarz, Dirk Wiedermann, Anke Leinhaas, Alina Jakobs, Florian Schloen, Inna Schwarz, Michael Diedenhofen, Nils Christian Braun, Philipp Koch, Daniel A Peterson, Ulrich Kubitscheck, Mathias Hoehn, Oliver Brüstle
While transplantation represents a key tool for assessing in vivo functionality of neural stem cells and their suitability for neural repair, little is known about the integration of grafted neurons into the host brain circuitry. Rabies virus-based retrograde tracing has developed into a powerful approach for visualizing synaptically connected neurons. Here, we combine this technique with light sheet fluorescence microscopy (LSFM) to visualize transplanted cells and connected host neurons in whole-mouse brain preparations...
January 19, 2017: Nature Communications
https://www.readbyqxmd.com/read/28101733/3d-absorbed-dose-distribution-estimated-by-monte-carlo-simulation-in-radionuclide-therapy-with-a-monoclonal-antibody-targeting-synovial-sarcoma
#5
David Sarrut, Jean-Noël Badel, Adrien Halty, Gwenaelle Garin, David Perol, Philippe Cassier, Jean-Yves Blay, David Kryza, Anne-Laure Giraudet
BACKROUND: Radiolabeled OTSA101, a monoclonal antibody targeting synovial sarcoma (SS) developed by OncoTherapy Science, was used to treat relapsing SS metastases following a theranostic procedure: in case of significant (111)In-OTSA101 tumor uptake and favorable biodistribution, patient was randomly treated with 370/1110 MBq (90)Y-OTSA101. Monte Carlo-based 3D dosimetry integrating time-activity curves in VOI was performed on (111)In-OTSA101 repeated SPECT/CT. Estimated absorbed doses (AD) in normal tissues were compared to biological side effects and to the admitted maximal tolerated absorbed dose (MTD) in normal organs...
December 2017: EJNMMI Physics
https://www.readbyqxmd.com/read/28101411/simultaneous-multimodal-ophthalmic-imaging-using-swept-source-spectrally-encoded-scanning-laser-ophthalmoscopy-and-optical-coherence-tomography
#6
Joseph D Malone, Mohamed T El-Haddad, Ivan Bozic, Logan A Tye, Lucas Majeau, Nicolas Godbout, Andrew M Rollins, Caroline Boudoux, Karen M Joos, Shriji N Patel, Yuankai K Tao
Scanning laser ophthalmoscopy (SLO) benefits diagnostic imaging and therapeutic guidance by allowing for high-speed en face imaging of retinal structures. When combined with optical coherence tomography (OCT), SLO enables real-time aiming and retinal tracking and provides complementary information for post-acquisition volumetric co-registration, bulk motion compensation, and averaging. However, multimodality SLO-OCT systems generally require dedicated light sources, scanners, relay optics, detectors, and additional digitization and synchronization electronics, which increase system complexity...
January 1, 2017: Biomedical Optics Express
https://www.readbyqxmd.com/read/28101408/in-vivo-visualization-and-ex-vivo-quantification-of-experimental-myocardial-infarction-by-indocyanine-green-fluorescence-imaging
#7
Dmitry Sonin, Garry Papayan, Evgeniia Pochkaeva, Svetlana Chefu, Sarkis Minasian, Dmitry Kurapeev, Jarle Vaage, Nickolay Petrishchev, Michael Galagudza
The fluorophore indocyanine green accumulates in areas of ischemia-reperfusion injury due to an increase in vascular permeability and extravasation of the dye. The aim of the study was to validate an indocyanine green-based technique of in vivo visualization of myocardial infarction. A further aim was to quantify infarct size ex vivo and compare this technique with the standard triphenyltetrazolium chloride staining. Wistar rats were subjected to regional myocardial ischemia (30 minutes) followed by reperfusion (n = 7)...
January 1, 2017: Biomedical Optics Express
https://www.readbyqxmd.com/read/28097525/automated-bone-segmentation-and-surface-evaluation-of-a-small-animal-model-of-post-traumatic-osteoarthritis
#8
Austin J Ramme, Kevin Voss, Jurinus Lesporis, Matin S Lendhey, Thomas R Coughlin, Eric J Strauss, Oran D Kennedy
MicroCT imaging allows for noninvasive microstructural evaluation of mineralized bone tissue, and is essential in studies of small animal models of bone and joint diseases. Automatic segmentation and evaluation of articular surfaces is challenging. Here, we present a novel method to create knee joint surface models, for the evaluation of PTOA-related joint changes in the rat using an atlas-based diffeomorphic registration to automatically isolate bone from surrounding tissues. As validation, two independent raters manually segment datasets and the resulting segmentations were compared to our novel automatic segmentation process...
January 17, 2017: Annals of Biomedical Engineering
https://www.readbyqxmd.com/read/28095486/three-dimensional-assessment-of-temporomandibular-joint-using-mri-cbct-image-registration
#9
Mohammed A Q Al-Saleh, Kumaradevan Punithakumar, Manuel Lagravere, Pierre Boulanger, Jacob L Jaremko, Paul W Major
PURPOSE: To introduce a new approach to reconstruct a 3D model of the TMJ using magnetic resonance imaging (MRI) and cone-beam computed tomography (CBCT) registered images, and to evaluate the intra-examiner reproducibility values of reconstructing the 3D models of the TMJ. METHODS: MRI and CBCT images of five patients (10 TMJs) were obtained. Multiple MRIs and CBCT images were registered using a mutual information based algorithm. The articular disc, condylar head and glenoid fossa were segmented at two different occasions, at least one-week apart, by one investigator, and 3D models were reconstructed...
2017: PloS One
https://www.readbyqxmd.com/read/28095460/fecal-fat-analyses-in-chronic-pancreatitis-importance-of-fat-ingestion-before-stool-collection
#10
Friedemann Erchinger, Trond Engjom, Palwasha Jurmy, Erling Tjora, Odd Helge Gilja, Georg Dimcevski
OBJECTIVE: Quantitative determination of fecal fat still is the gold standard for measuring malabsorption. We evaluated the importance of standardized food intake before and under the collection of feces. MATERIAL AND METHODS: In a project, evaluating patients with suspected chronic pancreatitis (CP) and healthy volunteers (HC), stools were collected for 72 hours coupled to registration of nutritional intake over five consecutive days. Patient groups were created by a modified Layer score, which includes imaging findings, clinical parameters and pancreas function testing...
2017: PloS One
https://www.readbyqxmd.com/read/28093683/simple-clinical-score-to-predict-24-week-survival-times-in-patients-with-inoperable-malignant-distal-biliary-obstruction-as-a-tool-for-selecting-palliative-metallic-or-plastic-stents
#11
Pimsiri Sripongpun, Siriboon Attasaranya, Naichaya Chamroonkul, Theerapong Sookpaisal, Uthai Khow-Ean, Aroon Siripun, Chanon Kongkamol, Teerha Piratvisuth, Bancha Ovartlarnporn
BACKGROUND AND AIM: Endoscopic biliary drainage (EBD) is the mainstay treatment for inoperable malignant distal biliary obstruction (MDBO). Some authorities suggest that metallic stents are more cost-effective than plastic stents in patients with expected survival of at least 6 months. However, studies attempting to define the predictive factors for such survival times are limited. This study aims to develop a scoring system for predicting a survival time of <24 weeks in these patients...
January 17, 2017: Journal of Gastrointestinal Cancer
https://www.readbyqxmd.com/read/28093049/efficient-variational-approach-to-multimodal-registration-of%C3%A2-anatomical%C3%A2-and%C3%A2-functional-intra-patient-tumorous-brain-data
#12
Alvar-Ginés Legaz-Aparicio, Rafael Verdú-Monedero, Jorge Larrey-Ruiz, Juan Morales-Sánchez, Fernando López-Mir, Valery Naranjo, Ángela Bernabéu
This paper addresses the functional localization of intra-patient images of the brain. Functional images of the brain (fMRI and PET) provide information about brain function and metabolism whereas anatomical images (MRI and CT) supply the localization of structures with high spatial resolution. The goal is to find the geometric correspondence between functional and anatomical images in order to complement and fuse the information provided by each imaging modality. The proposed approach is based on a variational formulation of the image registration problem in the frequency domain...
November 29, 2016: International Journal of Neural Systems
https://www.readbyqxmd.com/read/28092638/mr-elastography-to-measure-the-effects-of-cancer-and-pathology-fixation-on-prostate-biomechanics-and-comparison-with-t-1-t-2-and-adc
#13
Deirdre M McGrath, Jenny Lee, Warren D Foltz, Navid Samavati, Theo van der Kwast, Michael A S Jewett, Peter Chung, Cynthia Ménard, Kristy K Brock
MRI is under evaluation for image-guided intervention for prostate cancer. The sensitivity and specificity of MRI parameters is determined via correlation with the gold-standard of histopathology. Whole-mount histopathology of prostatectomy specimens can be digitally registered to in vivo imaging for correlation. When biomechanical-based deformable registration is employed to account for deformation during histopathology processing, the ex vivo biomechanical properties are required. However, these properties are altered by pathology fixation, and vary with disease...
February 7, 2017: Physics in Medicine and Biology
https://www.readbyqxmd.com/read/28092584/temporally-coherent-illumination-normalization-for-indocyanine-green-video-angiography
#14
Wei-Yang Lin, Shu-Fu Chou, Chia-Ling Tsai, Shih-Jen Chen
Indocyanine green (ICG) angiography is an imaging method for Doctors to observe choroidal abnormalities in human eyes. The ICG angiograms typically exhibit inhomogeneous illumination which poses serious difficulties for the development of computer-aided diagnostic tools. In this paper, we propose a novel illumination normalization method to alleviate the inhomogeneous illumination in ICG video angiograms. In particular, we first align the viewpoint of the input ICG video angiogram using an image registration method...
January 16, 2017: IEEE Journal of Biomedical and Health Informatics
https://www.readbyqxmd.com/read/28092560/diffeomorphic-multi-frame-non-rigid-registration-of-cell-nuclei-in-2d-and-3d-live-cell-images
#15
Marco Tektonidis, Karl Rohr
To gain a better understanding of cellular and molecular processes it is important to quantitatively analyze the motion of subcellular particles in live cell microscopy image sequences. Since generally the subcellular particles move and cell nuclei move as well as deform, it is important to decouple the movement of particles from that of the cell nuclei using nonrigid registration methods. We have developed a diffeomorphic multi-frame approach for non-rigid registration of cell nuclei in 2D and 3D live cell fluorescence microscopy images...
January 16, 2017: IEEE Transactions on Image Processing: a Publication of the IEEE Signal Processing Society
https://www.readbyqxmd.com/read/28092527/block-matching-distortion-correction-of-echo-planar-images-with-opposite-phase-encoding-directions
#16
Renaud Hedouin, Olivier Commowick, Elise Bannier, Benoit Scherrer, Maxime Taquet, Simon Warfield, Christian Barillot
By shortening the acquisition time of MRI, Echo Planar Imaging (EPI) enables the acqui- sition of a large number of images in a short time, com- patible with clinical constraints as required for diffusion or functional MRI. However such images are subject to large, local distortions disrupting their correspondence with the underlying anatomy. The correction of those distortions is an open problem, especially in regions where large deformations occur. We propose a new block-matching registration method to perform EPI distortion correction based on the acquisition of two EPI with opposite phase encoding directions (PED)...
January 9, 2017: IEEE Transactions on Medical Imaging
https://www.readbyqxmd.com/read/28092517/transformations-based-on-continuous-piecewise-affine-velocity-fields
#17
Oren Freifeld, Soren Hauberg, Kayhan Batmanghelich, John W Fisher
We propose novel finite-dimensional spaces of well-behaved Rn → Rn transformations. The latter are obtained by (fast and highly-accurate) integration of continuous piecewise-affine velocity fields. The proposed method is simple yet highly expressive, effortlessly handles optional constraints (e.g., volume preservation and/or boundary conditions), and supports convenient modeling choices such as smoothing priors and coarse-to-fine analysis. Importantly, the proposed approach, partly due to its rapid likelihood evaluations and partly due to its other properties, facilitates tractable inference over rich transformation spaces, including using Markov-Chain Monte-Carlo methods...
January 11, 2017: IEEE Transactions on Pattern Analysis and Machine Intelligence
https://www.readbyqxmd.com/read/28091728/value-of-nonrigid-registration-of-pre-procedure-mr-with-post-procedure-ct-after-radiofrequency-ablation-for-hepatocellular-carcinoma
#18
Juil Park, Jeong Min Lee, Dong Ho Lee, Ijin Joo, Jeong Hee Yoon, Jin Young Park, Ernst Klotz
PURPOSE: To evaluate the value of pre-radiofrequency ablation (RFA) MR and post-RFA CT registration for the assessment of the therapeutic response of hepatocellular carcinoma (HCC). MATERIALS AND METHODS: A total of 178 patients with single HCC who received RFA as an initial treatment and had available pre-RFA MR and post-RFA CT images were included in this retrospective study. Two independent readers (one experienced radiologist, one inexperienced radiologist) scored the ablative margin (AM) of treated tumors on a four-point scale (1, residual tumor; 2, incomplete AM; 3, borderline AM; 4, sufficient AM), in two separate sessions: (1) visual comparison between pre-and post-RFA images; (2) with addition of nonrigid registration for pre- and post-RFA images...
January 13, 2017: Cardiovascular and Interventional Radiology
https://www.readbyqxmd.com/read/28090802/functional-deficits-induced-by-cortical-microinfarcts
#19
Philipp M Summers, David A Hartmann, Edward S Hui, Xingju Nie, Rachael L Deardorff, Emilie T McKinnon, Joseph A Helpern, Jens H Jensen, Andy Y Shih
Clinical studies have revealed a strong link between increased burden of cerebral microinfarcts and risk for cognitive impairment. Since the sum of tissue damage incurred by microinfarcts is a miniscule percentage of total brain volume, we hypothesized that microinfarcts disrupt brain function beyond the injury site visible to histological or radiological examination. We tested this idea using a mouse model of microinfarcts, where single penetrating vessels that supply mouse cortex were occluded by targeted photothrombosis...
January 1, 2017: Journal of Cerebral Blood Flow and Metabolism
https://www.readbyqxmd.com/read/28090441/principal-component-analysis-t1%C3%AF-voxel-based-relaxometry-of-the-articular-cartilage-a-comparison-of-biochemical-patterns-in-osteoarthritis-and-anterior-cruciate-ligament-subjects
#20
Valentina Pedoia, Colin Russell, Allison Randolph, Xiaojuan Li, Sharmila Majumdar
BACKGROUND: Quantitative MR, including T1ρ mapping, has been extensively used to probe early biochemical changes in knee articular cartilage of subjects with osteoarthritis (OA) and others at risk for cartilage degeneration, such as those with anterior cruciate ligament (ACL) injury and reconstruction. However, limited studies have been performed aimed to assess the spatial location and patterns of T1ρ. In this study we used a novel voxel-based relaxometry (VBR) technique coupled with principal component analysis (PCA) to extract relevant features so as to describe regional patterns and to investigate their similarities and differences in T1ρ maps in subjects with OA and subjects six months after ACL reconstruction (ACLR)...
December 2016: Quantitative Imaging in Medicine and Surgery
keyword
keyword
67331
1
2
Fetch more papers »
Fetching more papers... Fetching...
Read by QxMD. Sign in or create an account to discover new knowledge that matter to you.
Remove bar
Read by QxMD icon Read
×

Search Tips

Use Boolean operators: AND/OR

diabetic AND foot
diabetes OR diabetic

Exclude a word using the 'minus' sign

Virchow -triad

Use Parentheses

water AND (cup OR glass)

Add an asterisk (*) at end of a word to include word stems

Neuro* will search for Neurology, Neuroscientist, Neurological, and so on

Use quotes to search for an exact phrase

"primary prevention of cancer"
(heart or cardiac or cardio*) AND arrest -"American Heart Association"