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MR image segmentation

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https://www.readbyqxmd.com/read/29330658/patient-specific-model-based-segmentation-of-brain-tumors-in-3d-intraoperative-ultrasound-images
#1
Elisee Ilunga-Mbuyamba, Juan Gabriel Avina-Cervantes, Dirk Lindner, Felix Arlt, Jean Fulbert Ituna-Yudonago, Claire Chalopin
PURPOSE: Intraoperative ultrasound (iUS) imaging is commonly used to support brain tumor operation. The tumor segmentation in the iUS images is a difficult task and still under improvement because of the low signal-to-noise ratio. The success of automatic methods is also limited due to the high noise sensibility. Therefore, an alternative brain tumor segmentation method in 3D-iUS data using a tumor model obtained from magnetic resonance (MR) data for local MR-iUS registration is presented in this paper...
January 12, 2018: International Journal of Computer Assisted Radiology and Surgery
https://www.readbyqxmd.com/read/29324417/robust-object-co-segmentation-using-background-prior
#2
Junwei Han, Rong Quan, Dingwen Zhang, Feiping Nie
Given a set of images that contain objects from a common category, object co-segmentation aims at automatically discovering and segmenting such common objects from each image. During the past few years, object co-segmentation has received great attention in the computer vision community. However, the existing approaches are usually designed with misleading assumptions, unscalable priors, or subjective computational models, which do not have sufficient robustness for dealing with complex and unconstrained real-world image contents...
April 2018: IEEE Transactions on Image Processing: a Publication of the IEEE Signal Processing Society
https://www.readbyqxmd.com/read/29322528/mr-and-ct-data-with-multi-observer-delineations-of-organs-in-the-pelvic-area-part-of-the-gold-atlas-project
#3
Tufve Nyholm, Stina Svensson, Sebastian Andersson, Joakim Jonsson, Maja Sohlin, Christian Gustafsson, Elisabeth Kjellén, Karin Söderström, Per Albertsson, Lennart Blomqvist, Björn Zackrisson, Lars E Olsson, Adalsteinn Gunnlaugsson
PURPOSE: We describe a public dataset with MR and CT images of patients performed in the same position with both multi observer and expert consensus delineations of relevant organs in the male pelvic region. The purpose is to provide means for training and validation of segmentation algorithms and methods to convert MR to CT like data, i.e., so called synthetic CT (sCT). ACQUISITION AND VALIDATION METHODS: T1 and T2 weighted MR images as well as CT data was collected for 19 patients at three different departments...
January 11, 2018: Medical Physics
https://www.readbyqxmd.com/read/29319785/diagnostic-accuracy-and-prognostic-value-of-simultaneous-hybrid-18f-fluorodeoxyglucose-positron-emission-tomography-magnetic-resonance-imaging-in-cardiac-sarcoidosis
#4
Eleanor C Wicks, Leon J Menezes, Anna Barnes, Saidi A Mohiddin, Neha Sekhri, Joanna C Porter, Helen L Booth, Emily Garrett, Riyaz S Patel, Menelaos Pavlou, Ashley M Groves, Perry M Elliott
Aims: Cardiac death is the leading cause of mortality in patients with sarcoidosis, yet cardiac involvement often remains undetected. Cardiovascular magnetic resonance imaging (CMR) and 18F-fluorodeoxyglucose (FDG)-positron emission tomography (PET) have been used to diagnose cardiac sarcoidosis (CS) yet never simultaneously in a cohort. This study sought to assess the diagnostic and prognostic utility of simultaneous hybrid cardiac PET/MR. Methods and results: Fifty-one consecutive patients with suspected CS (age 50 ± 13 years, 31 males) underwent simultaneous PET/MR following a high-fat/low-carbohydrate diet and 12-h fast...
January 8, 2018: European Heart Journal Cardiovascular Imaging
https://www.readbyqxmd.com/read/29313301/identification-and-classification-of-brain-tumor-mri-images-with-feature-extraction-using-dwt-and-probabilistic-neural-network
#5
N Varuna Shree, T N R Kumar
The identification, segmentation and detection of infecting area in brain tumor MRI images are a tedious and time-consuming task. The different anatomy structure of human body can be visualized by an image processing concepts. It is very difficult to have vision about the abnormal structures of human brain using simple imaging techniques. Magnetic resonance imaging technique distinguishes and clarifies the neural architecture of human brain. MRI technique contains many imaging modalities that scans and capture the internal structure of human brain...
January 8, 2018: Brain Informatics
https://www.readbyqxmd.com/read/29297330/surface-structure-feature-matching-algorithm-for-cardiac-motion-estimation
#6
Zhengrui Zhang, Xuan Yang, Cong Tan, Wei Guo, Guoliang Chen
BACKGROUND: Cardiac diseases represent the leading cause of sudden death worldwide. During the development of cardiac diseases, the left ventricle (LV) changes obviously in structure and function. LV motion estimation plays an important role for diagnosis and treatment of cardiac diseases. To estimate LV motion accurately for cine magnetic resonance (MR) cardiac images, we develop an algorithm by combining point set matching with surface structure features of myocardium. METHODS: The structure features of myocardial wall are described by estimating the normal directions of points locating on the myocardium contours using an approximation approach...
December 20, 2017: BMC Medical Informatics and Decision Making
https://www.readbyqxmd.com/read/29285575/alteration-of-gray-matter-texture-features-over-the-whole-brain-in-medication-overuse-headache-using-a-3-dimentional-texture-analysis
#7
Zhiye Chen, Xiaoyan Chen, Zhiqiang Chen, Mengqi Liu, Huiguang He, Lin Ma, Shengyuan Yu
BACKGROUND: Imaging studies have provided valuable information in understanding the headache neuromechanism for medication-overuse headache (MOH), and the aim of this study is to investigate altered texture features of MR structural images over the whole brain in MOH using a 3-dimentional texture analysis. METHODS: Brain three-dimensional T1-weighted structural images were obtained from 44 MOH patients and 32 normal controls (NC). The imaging processing included two steps: gray matter (gray images) segment and a 3-dimensional texture features mapping...
November 28, 2017: Journal of Headache and Pain
https://www.readbyqxmd.com/read/29284602/cervical-cord-atrophy-and-long-term-disease-progression-in-patients-with-primary-progressive-multiple-sclerosis
#8
F X Aymerich, C Auger, J Alonso, M Alberich, J Sastre-Garriga, M Tintoré, X Montalban, A Rovira
BACKGROUND AND PURPOSE: Cervical cord atrophy has been associated with clinical disability in multiple sclerosis and is proposed as an outcome measure of neurodegeneration. The aim of this study was to quantify the development of cervical cord atrophy and to evaluate its association with disability progression in patients with primary-progressive multiple sclerosis. MATERIALS AND METHODS: Thirty-one patients with primary-progressive multiple sclerosis underwent 1...
December 28, 2017: AJNR. American Journal of Neuroradiology
https://www.readbyqxmd.com/read/29279170/upper-tract-urothelial-cancer
#9
REVIEW
Adam Froemming, Theodora Potretzke, Naoki Takahashi, Bohyun Kim
While urothelial carcinoma is a very common tumor, involvement of the upper tract is relatively uncommon. Consequently, there are no consensus imaging recommendations for upper tract disease. CT urography is the dominant imaging modality for the upper tract, but despite its excellent performance characteristics and being widely accepted as standard of care there is great variability in how CTU exams are performed across practices. MR urography has limited current application, but has the potential to become more mainstream in the future with continued technical advances...
January 2018: European Journal of Radiology
https://www.readbyqxmd.com/read/29278946/experimental-assessment-of-phase-aberration-correction-for-breast-mrgfus-therapy
#10
Christopher R Dillon, Alexis Farrer, Hailey McLean, Scott Almquist, Douglas Christensen, Allison Payne
PURPOSE: This study validates that phase aberrations in breast magnetic resonance-guided focused ultrasound (MRgFUS) therapies can be corrected in a clinically relevant time frame to generate more intense, smaller and more spatially accurate foci. MATERIALS AND METHODS: Hybrid Angular Spectrum (HAS) ultrasound calculations in an MRI-based tissue model were used to compute phase aberration corrections for improved experimental MRgFUS heating in four heterogeneous breast-mimicking phantoms (N = 18 total locations)...
December 26, 2017: International Journal of Hyperthermia
https://www.readbyqxmd.com/read/29278746/accuracy-of-mri-based-finite-element-assessment-of-distal-tibia-compared-to-mechanical-testing
#11
Chamith S Rajapakse, Elizabeth A Kobe, Alexandra S Batzdorf, Michael W Hast, Felix W Wehrli
High-resolution MRI-derived finite element analysis (FEA) has been used in translational research to estimate the mechanical competence of human bone. However, this method has yet to be validated adequately under in vivo imaging spatial resolution or signal-to-noise conditions. We therefore compared MRI-based metrics of bone strength to those obtained from direct, mechanical testing. The study was conducted on tibiae from 17 human donors (12 males and five females, aged 33 to 88years) with no medical history of conditions affecting bone mineral homeostasis...
December 23, 2017: Bone
https://www.readbyqxmd.com/read/29260294/fatty-filum-terminale-fft-as-a-secondary-tethering-element-in-children-with-closed-spinal-dysraphism
#12
Ankush Gupta, Vedantam Rajshekhar
PURPOSE: The purpose of this study was to assess the prevalence of FFT as an additional tethering element in children operated for closed spinal dysraphism, where FFT was not the primary tethering pathology. METHODS: This is a retrospective study of 195 children (< 18 years of age) who underwent surgery for closed spinal dysraphism and did not have FFT as the primary diagnosis. All patients were operated during the period 2005-2017 by a single surgeon. The commonest diagnosis was a lipomyelomeningocele (LMMC, n = 81, 41...
December 19, 2017: Child's Nervous System: ChNS: Official Journal of the International Society for Pediatric Neurosurgery
https://www.readbyqxmd.com/read/29258534/a-3d-subject-specific-model-of-the-spinal-subarachnoid-space-with-anatomically-realistic-ventral-and-dorsal-spinal-cord-nerve-rootlets
#13
Lucas R Sass, Mohammadreza Khani, Gabryel Connely Natividad, R Shane Tubbs, Olivier Baledent, Bryn A Martin
BACKGROUND: The spinal subarachnoid space (SSS) has a complex 3D fluid-filled geometry with multiple levels of anatomic complexity, the most salient features being the spinal cord and dorsal and ventral nerve rootlets. An accurate anthropomorphic representation of these features is needed for development of in vitro and numerical models of cerebrospinal fluid (CSF) dynamics that can be used to inform and optimize CSF-based therapeutics. METHODS: A subject-specific 3D model of the SSS was constructed based on high-resolution anatomic MRI...
December 19, 2017: Fluids and Barriers of the CNS
https://www.readbyqxmd.com/read/29250547/multilevel-thresholding-method-based-on-electromagnetism-for-accurate-brain-mri-segmentation-to-detect-white-matter-gray-matter-and-csf
#14
G Sandhya, Giri Babu Kande, T Satya Savithri
This work explains an advanced and accurate brain MRI segmentation method. MR brain image segmentation is to know the anatomical structure, to identify the abnormalities, and to detect various tissues which help in treatment planning prior to radiation therapy. This proposed technique is a Multilevel Thresholding (MT) method based on the phenomenon of Electromagnetism and it segments the image into three tissues such as White Matter (WM), Gray Matter (GM), and CSF. The approach incorporates skull stripping and filtering using anisotropic diffusion filter in the preprocessing stage...
2017: BioMed Research International
https://www.readbyqxmd.com/read/29248842/group-wise-similarity-registration-of-point-sets-using-student-s-t-mixture-model-for-statistical-shape-models
#15
Nishant Ravikumar, Ali Gooya, Serkan Çimen, Alejandro F Frangi, Zeike A Taylor
A probabilistic group-wise similarity registration technique based on Student's t-mixture model (TMM) and a multi-resolution extension of the same (mr-TMM) are proposed in this study, to robustly align shapes and establish valid correspondences, for the purpose of training statistical shape models (SSMs). Shape analysis across large cohorts requires automatic generation of the requisite training sets. Automated segmentation and landmarking of medical images often result in shapes with varying proportions of outliers and consequently require a robust method of alignment and correspondence estimation...
December 5, 2017: Medical Image Analysis
https://www.readbyqxmd.com/read/29243669/simultaneous-tumor-and-surrogate-motion-tracking-with-dynamic-mri-for-radiation-therapy-planning
#16
Seyoun Park, Rana Farah, Steven M Shea, Erik J Tryggestad, Russell Hales, Junghoon Lee
Respiration-induced tumor motion is a major obstacle for achieving high-precision radiotherapy of cancers in the thoracic and abdominal regions. Surrogate-based estimation and tracking methods are commonly used in radiotherapy, but with limited understanding of quantified correlation to tumor motion. In this study, we propose a method to simultaneously track the lung tumor and external surrogates to evaluate their spatial correlation in a quantitative way using dynamic MRI, which allows real-time acquisition without ionizing radiation exposure...
December 15, 2017: Physics in Medicine and Biology
https://www.readbyqxmd.com/read/29242976/a-rare-case-of-concomitant-cervical-disc-herniation-and-intradural-meningioma-treated-with-one-stage-posterior-surgery
#17
Xiaojian Hu, Zhong Chen, Yue Wang
STUDY DESIGN: Case report. PURPOSE: To present a rare case of cervical disc herniation concomitant with intradural meningioma which was successfully treated using a single one-stage posterior surgery of tumor resection and transdural discectomy. Coexistence of symptomatic disc herniation and intra-spinal tumor in the same cervical segment is extremely rare. Usually, two-stage anterior and posterior surgeries are needed to treat two conditions, respectively. One-stage posterior surgery to treat two pathologies simultaneously has not been reported in the literature...
December 14, 2017: European Spine Journal
https://www.readbyqxmd.com/read/29239394/quantitative-mr-image-analysis-for-brian-tumor
#18
Zeina A Shboul, Sayed M S Reza, Khan M Iftekharuddin
This paper presents an integrated quantitative MR image analysis framework to include all necessary steps such as MRI inhomogeneity correction, feature extraction, multiclass feature selection and multimodality abnormal brain tissue segmentation respectively. We first obtain mathematical algorithm to compute a novel Generalized multifractional Brownian motion (GmBm) texture feature. We then demonstrate efficacy of multiple multiresolution texture features including regular fractal dimension (FD) texture, and stochastic texture such as multifractional Brownian motion (mBm) and GmBm features for robust tumor and other abnormal tissue segmentation in brain MRI...
2018: VipIMAGE 2017 (2017)
https://www.readbyqxmd.com/read/29238919/a-novel-fully-automatic-multilevel-thresholding-technique-based-on-optimized-intuitionistic-fuzzy-sets-and-tsallis-entropy-for-mr-brain-tumor-image-segmentation
#19
Taranjit Kaur, Barjinder Singh Saini, Savita Gupta
In the present paper, a hybrid multilevel thresholding technique that combines intuitionistic fuzzy sets and tsallis entropy has been proposed for the automatic delineation of the tumor from magnetic resonance images having vague boundaries and poor contrast. This novel technique takes into account both the image histogram and the uncertainty information for the computation of multiple thresholds. The benefit of the methodology is that it provides fast and improved segmentation for the complex tumorous images with imprecise gray levels...
December 13, 2017: Australasian Physical & Engineering Sciences in Medicine
https://www.readbyqxmd.com/read/29232024/myocardial-perfusion-reserve-index-in-children-with-kawasaki-disease
#20
Richard M Friesen, Michal Schäfer, Pei-Ni Jone, Nana Appiawiah, Daniel Vargas, Brian Fonseca, Michael V DiMaria, Uyen Truong, LaDonna Malone, Lorna P Browne
BACKGROUND: Coronary artery lesions in patients with Kawasaki disease (KD) can impair myocardial perfusion, yet evaluation of perfusion defects by cardiac magnetic resonance (MR) in children is often qualitative. PURPOSE: In this study we aimed to use a quantitative method of myocardial perfusion using stress cardiac MR-derived myocardial perfusion reserve index (MPRI) in children with KD and compare MPRI with ventricular mechanical performance evaluated by cardiac MR strain analysis...
December 12, 2017: Journal of Magnetic Resonance Imaging: JMRI
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