keyword
MENU ▼
Read by QxMD icon Read
search

mri template

keyword
https://www.readbyqxmd.com/read/29215821/a-fast-3-dimensional-magnetic-resonance-imaging-reconstruction-for-surgical-planning-of-uterine-myomectomy
#1
Sa Ra Lee, Young Jae Kim, Kwang Gi Kim
BACKGROUND: Uterine myoma is the most common benign gynecologic tumor in reproductive-aged women. During myomectomy for women who want to preserve fertility, it is advisable to detect and remove all myomas to decrease the risk of additional surgery. However, finding myomas during surgery is often challenging, especially for deep-seated myomas. Therefore, three-dimensional (3D) preoperative localization of myomas can be helpful for the surgical planning for myomectomy. However, the previously reported manual 3D segmenting method takes too much time and effort for clinical use...
January 8, 2018: Journal of Korean Medical Science
https://www.readbyqxmd.com/read/29209734/effects-of-hypothyroidism-on-serotonin-1a-receptors-in-the-rat-brain
#2
Jae-Hoon Lee, Minkyung Lee, Ji-Ae Park, Young Hoon Ryu, Kyo Chul Lee, Kyeong Min Kim, Jae Yong Choi
PURPOSE: We investigated the effects of hypothyroidism on serotonin 1A receptors in the rat brain in vivo. METHODS: Five surgically thyroidectomized male Sprague-Dawley (SD) rats and five hypophysectomized SD rats were used as animal models of hypothyroidism; the same number of sham-operated SD rats served as age-matched controls. After hypothyroidism was confirmed by thyroid function tests, serotonin positron emission tomography (PET) was performed for 120 min...
December 5, 2017: Psychopharmacology
https://www.readbyqxmd.com/read/29208569/a-digital-3d-atlas-of-the-marmoset-brain-based-on-multi-modal-mri
#3
Cirong Liu, Frank Q Ye, Cecil Chern-Chyi Yen, John D Newman, Daniel Glen, David A Leopold, Afonso C Silva
The common marmoset (Callithrix jacchus) is a New-World monkey of growing interest in neuroscience. Magnetic resonance imaging (MRI) is an essential tool to unveil the anatomical and functional organization of the marmoset brain. To facilitate identification of regions of interest, it is desirable to register MR images to an atlas of the brain. However, currently available atlases of the marmoset brain are mainly based on 2D histological data, which are difficult to apply to 3D imaging techniques. Here, we constructed a 3D digital atlas based on high-resolution ex-vivo MRI images, including magnetization transfer ratio (a T1-like contrast), T2w images, and multi-shell diffusion MRI...
December 2, 2017: NeuroImage
https://www.readbyqxmd.com/read/29204168/pre-plan-technique-feasibility-in-multi-interstitial-endocavitary-perineal-gynecological-brachytherapy
#4
Silvia Rodriguez, Antonio Otal, Jose Richart, Jose Perez-Calatayud, Manuel Santos
Purpose: To present the implementation of a magnetic resonance imaging (MRI) pre-planning technique in multi-interstitial perineal and endocavitary gynecological brachytherapy. Material and methods: We used a new fully MRI-compatible applicator that is capable to engage titanium needles, and an intrauterine tandem, developed in our department for the treatment of gynecological cervical cancer patients. This applicator is an attempt to combine the technical advantages of the Martinez universal perineal interstitial template (MUPIT) with the improvement in dose distribution by adding an intrauterine probe with the imaging advantages of MRI-based brachytherapy, thus preserving the stability, geometry, and robustness of the implant, avoiding possible errors of free-hand needle placement...
October 2017: Journal of Contemporary Brachytherapy
https://www.readbyqxmd.com/read/29193340/template-based-field-map-prediction-for-rapid-whole-brain-b0-shimming
#5
Yuhang Shi, S Johanna Vannesjo, Karla L Miller, Stuart Clare
PURPOSE: In typical MRI protocols, time is spent acquiring a field map to calculate the shim settings for best image quality. We propose a fast template-based field map prediction method that yields near-optimal shims without measuring the field. METHODS: The template-based prediction method uses prior knowledge of the B0 distribution in the human brain, based on a large database of field maps acquired from different subjects, together with subject-specific structural information from a quick localizer scan...
November 28, 2017: Magnetic Resonance in Medicine: Official Journal of the Society of Magnetic Resonance in Medicine
https://www.readbyqxmd.com/read/29189042/characterizing-indeterminate-likert-scored-3-5-peripheral-zone-prostate-lesions-with-psa-density-pi-rads-scoring-and-qualitative-descriptors-on-multi-parametric-mri
#6
Mrishta Brizmohun Appayya, Harbir S Sidhu, Nikolaos Dikaios, Edward W Johnston, Lucy Am Simmons, Alex Freeman, Alexander Ps Kirkham, Hashim U Ahmed, Shonit Punwani
OBJECTIVE: To determine whether indeterminate (Likert-score 3/5) peripheral zone (PZ) multi-parametric MRI (mpMRI) studies are classifiable by Prostate-Specific Antigen (PSA), PSA density (PSAD), PI-RADS_v2 rescoring and morphological MRI features. METHODS: Men with maximum Likert-score 3/5 within their PZ were retrospectively selected from 330 men who prospectively underwent prostate mpMRI (3T) without an endorectal coil, followed by twenty-zone trans-perineal template prostate mapping biopsies ± focal lesion-targeted biopsy...
November 30, 2017: British Journal of Radiology
https://www.readbyqxmd.com/read/29186008/pet-attenuation-correction-for-flexible-mri-surface-coils-in-hybrid-pet-mri-using-a-3d-depth-camera
#7
Lynn Johann Frohwein, Mirco Hess, Dominik Schlicher, Konstantin Bolwin, Florian Büther, Xiaoyi Jiang, Klaus P Schäfers
PET attenuation correction for flexible MRI radio frequency surface coils in hybrid PET/MRI is still a challenging task, as position and shape of these coils conform to large inter-patient variabilities. The purpose of this feasibility study is to develop a novel method for the incorporation of attenuation information about flexible surface coils in PET reconstruction using the Microsoft Kinect V2 depth camera. The depth information is used to determine a dense point cloud of the coil's surface representing the shape of the coil...
November 29, 2017: Physics in Medicine and Biology
https://www.readbyqxmd.com/read/29161359/recurrent-processing-of-contour-integration-in-the-human-visual-cortex-as-revealed-by-fmri-guided-tms
#8
Ya Li, Yonghui Wang, Sheng Li
Contour integration is a critical step in visual perception because it groups discretely local elements into perceptually global contours. Previous investigations have suggested that striate and extrastriate visual areas are involved in this mid-level processing of visual perception. However, the temporal dynamics of these areas in the human brain during contour integration is less understood. The present study used functional magnetic resonance imaging-guided transcranial magnetic stimulation (TMS) to briefly disrupt 1 of 2 visual areas (V1/V2 and V3B) and examined the causal contributions of these areas to contour detection...
November 17, 2017: Cerebral Cortex
https://www.readbyqxmd.com/read/29158516/prostate-shapes-on-pre-treatment-mri-between-prostate-cancer-patients-who-do-and-do-not-undergo-biochemical-recurrence-are-different-preliminary-findings
#9
Soumya Ghose, Rakesh Shiradkar, Mirabela Rusu, Jhimli Mitra, Rajat Thawani, Michael Feldman, Amar C Gupta, Andrei S Purysko, Lee Ponsky, Anant Madabhushi
Early identification of PCa patients at risk for biochemical recurrence (BCR) post-therapy will potentially complement definitive therapy with either neo- or adjuvant therapy to improve prognosis. BCR post definitive therapy is often associated with disease progression that might cause a bulge in the prostate gland. In this work we explored if an atlas-based comparison approach reveals shape differences in the prostate capsule as observed on pre-treatment T2-weighted MRI between prostate cancer patients who do (BCR (+)) and do not (BCR (-)) have BCR following definitive therapy...
November 20, 2017: Scientific Reports
https://www.readbyqxmd.com/read/29158073/methodological-challenges-in-the-comparison-of-infant-fmri-across-age-groups
#10
REVIEW
Rhodri Cusack, Olivia McCuaig, Annika C Linke
Functional MRI (fMRI) in infants is rapidly growing and providing fundamental insights into the origins of brain functions. Comparing brain development at different ages is particularly powerful, but there are a number of methodological challenges that must be addressed if confounds are to be avoided. With development, brains change in composition in a way that alters their tissue contrast, and in size, shape, and gyrification, requiring careful image processing strategies and age-specific standard templates...
November 11, 2017: Developmental Cognitive Neuroscience
https://www.readbyqxmd.com/read/29146191/automatic-delineation-of-brain-regions-on-mri-and-pet-images-from-the-pig
#11
Jonas Villadsen, Hanne D Hansen, Louise M Jørgensen, Sune H Keller, Flemming L Andersen, Ida N Petersen, Gitte M Knudsen, Claus Svarer
BACKGROUND: The increasing use of the pig as a research model in neuroimaging requires standardized processing tools. For example, extraction of regional dynamic time series from brain PET images requires parcellation procedures that benefit from being automated. COMPARISON WITH EXISTING METHODS: Manual inter-modality spatial normalization to a MRI atlas is operator-dependent, time-consuming, and can be inaccurate with lack of cortical radiotracer binding or skull uptake...
November 13, 2017: Journal of Neuroscience Methods
https://www.readbyqxmd.com/read/29134725/reproducibility-of-brain-mri-segmentation-algorithms-empirical-comparison-of-local-map-pstaple-freesurfer-and-fsl-first
#12
Clemente Velasco-Annis, Alireza Akhondi-Asl, Aymeric Stamm, Simon K Warfield
BACKGROUND AND PURPOSE: Segmentation of human brain structures is crucial for the volumetric quantification of brain disease. Advances in algorithmic approaches have led to automated techniques that save time compared to interactive methods. Recently, the utility and accuracy of template library fusion algorithms, such as Local MAP PSTAPLE (PSTAPLE), have been demonstrated but there is little guidance regarding its reproducibility compared to single template-based algorithms such as FreeSurfer and FSL-FIRST...
November 14, 2017: Journal of Neuroimaging: Official Journal of the American Society of Neuroimaging
https://www.readbyqxmd.com/read/29107274/focal-ablation-of-early-stage-prostate-cancer-candidate-selection-treatment-guidance-and-assessment-of-outcome
#13
REVIEW
Eric Edison, Taimur Tariq Shah, Hashim U Ahmed
Prostate cancer lesions smaller than 0.5 m3, or Gleason pattern 3, are likely clinically insignificant. Clinically significant disease is often limited to a single index lesion. Focal ablation targets this index lesion, maintains oncological control, and minimizes complications by preserving healthy prostate tissue. Template mapping biopsy or multiparametric MRI-targeted biopsies are used to identify appropriate index lesions. Multiple energy modalities have been tested, including high-intensity frequency ultrasound, cryoablation, laser ablation, photodynamic therapy, focal brachytherapy, radiofrequency ablation, irreversible electroporation...
November 2017: Urologic Clinics of North America
https://www.readbyqxmd.com/read/29107217/ultrasensitive-mri-detection-of-spontaneous-pancreatic-tumors-with-nanocage-based-targeted-contrast-agent
#14
Takahito Kawano, Masaharu Murata, Jeong-Hun Kang, Jing Shu Piao, Sayoko Narahara, Fuminori Hyodo, Nobuhito Hamano, Jie Guo, Susumu Oguri, Kenoki Ohuchida, Makoto Hashizume
Contrast agents with greater specificity and sensitivity are required for the diagnosis of pancreatic cancers by magnetic resonance imaging (MRI). In this study, small heat shock protein 16.5 (Hsp16.5)-based nanocages conjugated to gadolinium(III)-chelated contrast agents and iRGD peptides (which target neuropilin-1 expressed on pancreatic cancer cells) were developed. To investigate whether template size influences relaxivity, nanocages with one to four hydrophobic domains were designed. MRI data showed that larger nanocages had higher T1 relaxivity than smaller nanocages, which resulted from a reduction in molecular tumbling rates caused by an increase in nanocage size, and a robust cage structure resulting from the introduction of hydrophobic domains...
October 20, 2017: Biomaterials
https://www.readbyqxmd.com/read/29102671/preliminary-diagnostic-accuracy-of-multiparametric-magnetic-resonance-imaging-to-detect-residual-prostate-cancer-following-focal-therapy-with-irreversible-electroporation
#15
Matthijs J Scheltema, John I Chang, Willemien van den Bos, Maret Böhm, Warick Delprado, Ilan Gielchinsky, Theo M de Reijke, Jean J de la Rosette, Amila R Siriwardana, Ron Shnier, Phillip D Stricker
BACKGROUND: It is recommended to perform multiparametric magnetic resonance imaging (mpMRI) in the follow-up following focal therapy of prostate cancer (PCa). OBJECTIVE: To determine the diagnostic accuracy of mpMRI to detect residual PCa following focal therapy with irreversible electroporation. DESIGN, SETTING, AND PARTICIPANTS: Seventy-six patients with biopsy-proven localized PCa consented for primary irreversible electroporation between February 2013 and March 2016...
November 1, 2017: European Urology Focus
https://www.readbyqxmd.com/read/29100938/generative-diffeomorphic-modelling-of-large-mri-data-sets-for-probabilistic-template-construction
#16
Claudia Blaiotta, Patrick Freund, M Jorge Cardoso, John Ashburner
In this paper we present a hierarchical generative model of medical image data, which can capture simultaneously the variability of both signal intensity and anatomical shapes across large populations. Such a model has a direct application for learning average-shaped probabilistic tissue templates in a fully automated manner. While in principle the generality of the proposed Bayesian approach makes it suitable to address a wide range of medical image computing problems, our work focuses primarily on neuroimaging applications...
October 31, 2017: NeuroImage
https://www.readbyqxmd.com/read/29096104/ag-hpbs-by-a-coating-etching-strategy-and-their-derived-injectable-implants-for-enhanced-tumor-photothermal-treatment
#17
Yun Yan Su, Hui Yao, Shuang Zhao, Wei Tian, Wen Fei Liu, Shou Ju Wang, Ying Liu, Ying Tian, Xiao Dong Zhang, Zhao Gang Teng, Guang Ming Lu, Long Jiang Zhang
Herein, we demonstrate a coating-etching strategy to directly synthesize hollow Prussian blue (PB) nanocubes with well-dispersed Ag nanoparticles (denoted as Ag-HPB). The method is accomplished by introduction of PB precursors, K3Fe(CN)6 and Fe(3+) into a reaction system containing AgNO3 and ascorbic acid, in which a series reactions contain formation of Ag nanoparticles, coating of PB on the nanoparticles, and diffusion of Ag into the PB frameworks occur. The strategy for preparation of the hollow structured Ag-HPB is intrinsically simple and does not require pre-preparation of any sacrificial templates or toxic etching agents...
October 25, 2017: Journal of Colloid and Interface Science
https://www.readbyqxmd.com/read/29079523/combining-images-and-anatomical-knowledge-to-improve-automated-vein-segmentation-in-mri
#18
Phillip G D Ward, Nicholas J Ferris, Parnesh Raniga, David L Dowe, Amanda C L Ng, David G Barnes, Gary F Egan
PURPOSE: To improve the accuracy of automated vein segmentation by combining susceptibility-weighted images (SWI), quantitative susceptibility maps (QSM), and a vein atlas to produce a resultant image called a composite vein image (CV image). METHOD: An atlas was constructed in common space from manually traced MRI images from ten volunteers. The composite vein image was derived for each subject as a weighted sum of three inputs; an SWI image, a QSM image and the vein atlas...
October 25, 2017: NeuroImage
https://www.readbyqxmd.com/read/29075681/subject-specific-structural-parcellations-based-on-randomized-ab-divergences
#19
Nicolas Honnorat, Drew Parker, Birkan Tunç, Christos Davatzikos, Ragini Verma
Brain parcellation provides a means to approach the brain in smaller regions. It also affords an appropriate dimensionality reduction in the creation of connectomes. Most approaches to creating connectomes start with registering individual scans to a template, which is then parcellated. Data processing usually ends with the projection of individual scans onto the parcellation for extracting individual biomarkers, such as connectivity signatures. During this process, registration errors can significantly alter the quality of biomarkers...
September 2017: Medical Image Computing and Computer-assisted Intervention: MICCAI ..
https://www.readbyqxmd.com/read/29065207/cerebellar-gray-matter-reductions-associate-with-decreased-functional-connectivity-in-nicotine-dependent-individuals
#20
Zhujing Shen, Peiyu Huang, Chao Wang, Wei Qian, Yihong Yang, Minming Zhang
Introduction: Nicotine dependence (ND) is a chronic, relapsing mental disorder characterized by compulsive cigarette seeking and smoking. Although the cerebellum plays an increasingly implicated role in ND, the exact cerebellar alterations in ND remain unclear. Identifying the localization of these cerebellar abnormalities in ND may help to further understand the role of the cerebellum in ND. Thus, we investigated the structural and functional alterations in the cerebellum in a large sample of smokers using the spatially unbiased infratentorial template (SUIT)...
July 27, 2017: Nicotine & Tobacco Research: Official Journal of the Society for Research on Nicotine and Tobacco
keyword
keyword
78551
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"