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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
#1
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
https://www.readbyqxmd.com/read/28087898/editorial-comment-to-assessing-clinically-significant-prostate-cancer-diagnostic-properties-of-multiparametric-magnetic-resonance-imaging-compared-to-three-dimensional-transperineal-template-mapping-histopathology
#2
Claudia Kesch, Boris A Hadaschik, Jan P Radtke
No abstract text is available yet for this article.
January 13, 2017: International Journal of Urology: Official Journal of the Japanese Urological Association
https://www.readbyqxmd.com/read/28086899/evaluations-of-diffusion-tensor-image-registration-based-on-fiber-tractography
#3
Yi Wang, Yu Shen, Dongyang Liu, Guoqin Li, Zhe Guo, Yangyu Fan, Yilong Niu
BACKGROUND: Diffusion Tensor Magnetic Resonance Imaging (DT-MRI, also known as DTI) measures the diffusion properties of water molecules in tissues and to date is one of the main techniques that can effectively study the microstructures of the brain in vivo. Presently, evaluation of DTI registration techniques is still in an initial stage of development. METHODS AND RESULTS: In this paper, six well-known open source DTI registration algorithms: Elastic, Rigid, Affine, DTI-TK, FSL and SyN were applied on 11 subjects from an open-access dataset, among which one was randomly chosen as the template...
January 10, 2017: Biomedical Engineering Online
https://www.readbyqxmd.com/read/28048088/su-f-t-47-mri-t2-exclusive-based-planning-using-the-endocavitary-interstitial-gynecological-benidorm-applicator-a-proposed-tps-library-and-preplan-efficient-methodology
#4
J Richart, A Otal, S Rodriguez, M Santos, J Perez-Calatayud
PURPOSE: ABS and GEC-ESTRO have recommended MRI T2 for image guided brachytherapy. Recently, a new applicator (Benidorm Template, TB) has been developed in our Department (Rodriguez et al 2015). TB is fully MRI compatible because the Titanium needles and it allows the use of intrauterine tandem. Currently, TPS applicators library are not currently available for non-rigid applicators in case of interstitial component as the TB.The purpose of this work is to present the development of a library for the TB, together with its use on a pre-planning technique...
June 2016: Medical Physics
https://www.readbyqxmd.com/read/28047587/th-cd-207a-01-evaluation-of-lung-tumor-motion-management-strategy-with-dynamic-mri
#5
R Farah, S Park, S Shea, E Tryggestad, J Wong, R Hales, J Lee
PURPOSE: The purpose of this study is to develop a method to track and examine the correlation between the 3D motion of a lung tumor and an external surrogate with dynamic MRI. METHODS: Dynamic MRI was obtained from lung cancer patients. To examine the motion correlation between external surrogates and the tumor, we placed four fiducials on the patient's chest at different locations. We acquired a contiguous multi-slice 2D cine MRI (sagittal) to capture the lung and whole tumor, followed by a two-slice 2D cine MRI (sagittal) to simultaneously track the tumor and fiducials...
June 2016: Medical Physics
https://www.readbyqxmd.com/read/28035663/using-deep-learning-to-segment-breast-and-fibroglanduar-tissue-in-mri-volumes
#6
Mehmet Ufuk Dalmş, Geert Litjens, Katharina Holland, Arnaud Setio, Ritse Mann, Nico Karssemeijer, Albert Gubern-Mérida
PURPOSE: Automated segmentation of breast and fibroglandular tissue (FGT) is required for various computer-aided applications of breast MRI. Traditional image analysis and computer vision techniques, such atlas, template matching or edge and surface detection have been applied to solve this task. However, applicability of these methods is usually limited by the characteristics of the images used in the study datasets, while breast MRI vary with respect to the different MRI protocols used, in addition to the variability in breast shapes...
December 30, 2016: Medical Physics
https://www.readbyqxmd.com/read/28028199/idiosyncratic-patterns-of-representational-similarity-in-prefrontal-cortex-predict-attentional-performance
#7
Jeongmi Lee, Joy J Geng
: The efficiency of finding an object in a crowded environment depends largely on the similarity of non-targets to the search target. Models of attention theorize that the similarity is determined by representations stored within an "attentional template" held in working memory. However, the degree to which the contents of the attentional template are individually-unique and where those idiosyncratic representations are encoded in the brain, are unknown. We investigated this problem using representational similarity analysis (RSA) of human fMRI data to measure the common and idiosyncratic representations of famous face morphs during an identity categorization task; data from the categorization task were then used to predict performance on a separate identity search task...
December 27, 2016: Journal of Neuroscience: the Official Journal of the Society for Neuroscience
https://www.readbyqxmd.com/read/28017737/application-of-polymer-sensitive-mri-sequence-to-localization-of-eeg-electrodes
#8
Russell Butler, Guillaume Gilbert, Maxime Descoteaux, Pierre-Michel Bernier, Kevin Whittingstall
BACKGROUND: The growing popularity of simultaneous electroencephalography (EEG) and functional magnetic resonance imaging (fMRI) opens up the possibility of imaging EEG electrodes while the subject is in the scanner. Such information could be useful for improving the fusion of EEG-fMRI datasets. NEW METHOD: Here, we report for the first time how an ultra-short echo time (UTE) MR sequence can image the materials of an MR-compatible EEG cap, finding that electrodes and some parts of the wiring are visible in a high resolution UTE...
December 23, 2016: Journal of Neuroscience Methods
https://www.readbyqxmd.com/read/28008429/applications-of-patient-specific-3d-printing-in-medicine
#9
Martin Heller, Heide-Katharina Bauer, Elisabeth Goetze, Matthias Gielisch, Klaus E Roth, Philipp Drees, Gerrit S Maier, Bernhard Dorweiler, Ahmed Ghazy, Meik Neufurth, Werner E G Müller, Heinz C Schröder, Xiaohong Wang, Christian-Friedrich Vahl, Bilal Al-Nawas
Already three decades ago, the potential of medical 3D printing (3DP) or rapid prototyping for improved patient treatment began to be recognized. Since then, more and more medical indications in different surgical disciplines have been improved by using this new technique. Numerous examples have demonstrated the enormous benefit of 3DP in the medical care of patients by, for example, planning complex surgical interventions preoperatively, reducing implantation steps and anesthesia times, and helping with intraoperative orientation...
2016: International Journal of Computerized Dentistry
https://www.readbyqxmd.com/read/28008425/quantitative-pet-mri-evaluation-and-application-in-dementia
#10
Yongxia Zhou
A recently introduced integrated scanner combining simultaneous positron emission tomography (PET) and magnetic resonance imaging (MRI) (PET/MRI) acquisition presents a unique set of opportunities for neuroimaging research and dementia in particular [1]. Among these, the intrinsic co-registration of the images has the potential to reduce errors in multi-modality image registration, which could lead to better quantification of longitudinal volumetric changes in neuroanatomical features that are important for assessing disease progression...
June 2016: Jacobs J Med Diagn Med Imaging
https://www.readbyqxmd.com/read/27995072/application-of-texture-analysis-to-dat-spect-imaging-relationship-to-clinical-assessments
#11
Arman Rahmim, Yousef Salimpour, Saurabh Jain, Stephan A L Blinder, Ivan S Klyuzhin, Gwenn S Smith, Zoltan Mari, Vesna Sossi
Dopamine transporter (DAT) SPECT imaging is increasingly utilized for diagnostic purposes in suspected Parkinsonian syndromes. We performed a cross-sectional study to investigate whether assessment of texture in DAT SPECT radiotracer uptake enables enhanced correlations with severity of motor and cognitive symptoms in Parkinson's disease (PD), with the long-term goal of enabling clinical utility of DAT SPECT imaging, beyond standard diagnostic tasks, to tracking of progression in PD. Quantitative analysis in routine DAT SPECT imaging, if performed at all, has been restricted to assessment of mean regional uptake...
2016: NeuroImage: Clinical
https://www.readbyqxmd.com/read/27994534/influence-of-group-on-individual-subject-maps-in-spm-voxel-based-morphometry
#12
Andrew M Michael, Eli Evans, Gregory J Moore
Voxel based morphometry (VBM) is a widely utilized neuroimaging technique for spatially normalizing brain structural MRI (sMRI) onto a common template. The DARTEL technique of VBM takes into account the spatial intensity distribution of sMRIs to construct a study specific group template. The group template is then used to create final individual normalized tissue maps (FINTM) for each subject in the group. In this study, we investigate the effect of group on FINTM, i.e., we evaluate the variability of a constant subject's FINTM when other subjects in the group are iteratively changed...
2016: Frontiers in Neuroscience
https://www.readbyqxmd.com/read/27988322/a-multi-centre-evaluation-of-eleven-clinically-feasible-brain-pet-mri-attenuation-correction-techniques-using-a-large-cohort-of-patients
#13
Claes N Ladefoged, Ian Law, Udunna Anazodo, Keith St Lawrence, David Izquierdo-Garcia, Ciprian Catana, Ninon Burgos, M Jorge Cardoso, Sebastien Ourselin, Brian Hutton, Inés Mérida, Nicolas Costes, Alexander Hammers, Didier Benoit, Søren Holm, Meher Juttukonda, Hongyu An, Jorge Cabello, Mathias Lukas, Stephan Nekolla, Sibylle Ziegler, Matthias Fenchel, Bjoern Jakoby, Michael E Casey, Tammie Benzinger, Liselotte Højgaard, Adam E Hansen, Flemming L Andersen
AIM: To accurately quantify the radioactivity concentration measured by PET, emission data need to be corrected for photon attenuation; however, the MRI signal cannot easily be converted into attenuation values, making attenuation correction (AC) in PET/MRI challenging. In order to further improve the current vendor-implemented MR-AC methods for absolute quantification, a number of prototype methods have been proposed in the literature. These can be categorized into three types: template/atlas-based, segmentation-based, and reconstruction-based...
December 14, 2016: NeuroImage
https://www.readbyqxmd.com/read/27979798/mri-atlas-based-measurement-of-spinal-cord-injury-predicts-outcome-in-acute-flaccid-myelitis
#14
D B McCoy, J F Talbott, Michael Wilson, M D Mamlouk, J Cohen-Adad, Mark Wilson, J Narvid
BACKGROUND AND PURPOSE: Recent advances in spinal cord imaging analysis have led to the development of a robust anatomic template and atlas incorporated into an open-source platform referred to as the Spinal Cord Toolbox. Using the Spinal Cord Toolbox, we sought to correlate measures of GM, WM, and cross-sectional area pathology on T2 MR imaging with motor disability in patients with acute flaccid myelitis. MATERIALS AND METHODS: Spinal cord imaging for 9 patients with acute flaccid myelitis was analyzed by using the Spinal Cord Toolbox...
December 15, 2016: AJNR. American Journal of Neuroradiology
https://www.readbyqxmd.com/read/27955940/magnetic-resonance-imaging-transrectal-ultrasound-fusion-focal-cryotherapy-of-the-prostate-a-prospective-development-study
#15
Massimo Valerio, Taimur Tariq Shah, Paras Shah, Neil Mccartan, Mark Emberton, Manit Arya, Hashim Uddin Ahmed
OBJECTIVES: The use of software-based magnetic resonance-transrectal ultrasound fusion to deliver focal therapy may increase the precision of treatment. This is a prospective development study assessing the feasibility of Magnetic resonance imaging-transrectal ultrasound (MRI-TRUS) fusion focal cryotherapy. METHODS AND MATERIALS: Consecutive patients undergoing focal cryotherapy were included in an academic registry (December 2013-June 2014). MRI-TRUS fusion focal cryotherapy was offered to men with visible clinically significant prostate cancer (Galil SeedNet system)...
December 7, 2016: Urologic Oncology
https://www.readbyqxmd.com/read/27942446/voxel-based-lesion-symptom-mapping-analysis-of-depressive-mood-in-patients-with-isolated-cerebellar-stroke-a-pilot-study
#16
Na Young Kim, Sang Chul Lee, Ji-Cheol Shin, Ji Eun Park, Yong Wook Kim
Post-stroke depression (PSD) is the most common neuropsychological sequela of stroke and occurs in approximately one-third of all stroke survivors. However, there are no well-established predictors of PSD. Depression in stroke patients is correlated with unfavorable outcomes. Meta-analyses of the relationship between PSD and lesion location have yielded contradictory results and have not adequately addressed the impact of cerebellar lesions. Furthermore, other brain regions associated with depression in patients with cerebellar stroke remain a matter of debate...
2017: NeuroImage: Clinical
https://www.readbyqxmd.com/read/27932248/effect-of-template-reporting-of-brain-mris-for-multiple-sclerosis-on-report-thoroughness-and-neurologist-rated-quality-results-of-a-prospective-quality-improvement-project
#17
Elliot Dickerson, Matthew S Davenport, Faiz Syed, Olaf Stuve, Jeffrey A Cohen, John R Rinker, Myla D Goldman, Benjamin M Segal, Bradley R Foerster
PURPOSE: To assess the impact of structured reporting templates on the objective and subjective quality of radiology reports for brain MRIs in patients with multiple sclerosis (MS). METHODS: A HIPAA-compliant prospective quality improvement initiative was undertaken to develop and implement a 12-item structured reporting template for brain MRI examinations in patients with known or suspected MS based on published guidelines. Reports created 1 year before implementing the template served as the baseline...
December 5, 2016: Journal of the American College of Radiology: JACR
https://www.readbyqxmd.com/read/27928834/fast-fourier-based-simulation-of-off-resonance-artifacts-in-steady-state-gradient-echo-mri-applied-to-metal-object-localization
#18
Frank Zijlstra, Job G Bouwman, Ieva Braškutė, Max A Viergever, Peter R Seevinck
PURPOSE: To accelerate simulation of off-resonance artifacts in steady-state gradient echo MRI by using fast Fourier transforms and demonstrate its applicability to metal object localization. THEORY AND METHODS: By exploiting the repetitive nature of steady-state pulse sequences it is possible to use fast Fourier transforms to calculate the MR signal. Based on this principle, a method for fast simulation of off-resonance artifacts was designed. The method was validated against Bloch simulations and MRI scans...
December 7, 2016: Magnetic Resonance in Medicine: Official Journal of the Society of Magnetic Resonance in Medicine
https://www.readbyqxmd.com/read/27924300/a-dataset-of-multiresolution-functional-brain-parcellations-in-an-elderly-population-with-no-or-mild-cognitive-impairment
#19
Angela Tam, Christian Dansereau, AmanPreet Badhwar, Pierre Orban, Sylvie Belleville, Howard Chertkow, Alain Dagher, Alexandru Hanganu, Oury Monchi, Pedro Rosa-Neto, Amir Shmuel, John Breitner, Pierre Bellec
We present group eight resolutions of brain parcellations for clusters generated from resting-state functional magnetic resonance images for 99 cognitively normal elderly persons and 129 patients with mild cognitive impairment, pooled from four independent datasets. This dataset was generated as part of the following study: Common Effects of Amnestic Mild Cognitive Impairment on Resting-State Connectivity Across Four Independent Studies (Tam et al., 2015) [1]. The brain parcellations have been registered to both symmetric and asymmetric MNI brain templates and generated using a method called bootstrap analysis of stable clusters (BASC) (Bellec et al...
December 2016: Data in Brief
https://www.readbyqxmd.com/read/27914911/cervical-cancer-brachytherapy-in-canada-a-focus-on-interstitial-brachytherapy-utilization
#20
Amandeep S Taggar, Tien Phan, Laurel Traptow, Robyn Banerjee, Corinne M Doll
PURPOSE: Brachytherapy (BT) techniques for cervical cancer in Canada have changed over the last decade, with evolution to high-dose-rate and image-guided BT. However, there are currently no national data on the use of interstitial BT (IBT). The purpose of this study was to document IBT utilization in Canadian centers, as well as update details of cervical cancer BT practices. METHODS AND MATERIALS: All Canadian centers with gynecologic BT services (n = 33) were identified, and one gynecology radiation oncologist per center was sent a 33-item e-mail questionnaire regarding their center's practice for cervical cancer BT in 2015...
November 30, 2016: Brachytherapy
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