keyword
MENU ▼
Read by QxMD icon Read
search

MR image segmentation

keyword
https://www.readbyqxmd.com/read/28437634/convolutional-neural-network-regression-for-short-axis-left-ventricle-segmentation-in-cardiac-cine-mr-sequences
#1
Li Kuo Tan, Yih Miin Liew, Einly Lim, Robert A McLaughlin
Automated left ventricular (LV) segmentation is crucial for efficient quantification of cardiac function and morphology to aid subsequent management of cardiac pathologies. In this paper, we parameterize the complete (all short axis slices and phases) LV segmentation task in terms of the radial distances between the LV centerpoint and the endo- and epicardial contours in polar space. We then utilize convolutional neural network regression to infer these parameters. Utilizing parameter regression, as opposed to conventional pixel classification, allows the network to inherently reflect domain-specific physical constraints...
April 12, 2017: Medical Image Analysis
https://www.readbyqxmd.com/read/28432954/fully-automatic-left-ventricular-segmentation-from-long-axis-cardiac-cine-mr-scans
#2
Rahil Shahzad, Qian Tao, Oleh Dzyubachyk, Marius Staring, Boudewijn P F Lelieveldt, Rob J van der Geest
With an increasing number of large-scale population-based cardiac magnetic resonance (CMR) imaging studies being conducted nowadays, there comes the mammoth task of image annotation and image analysis. Such population-based studies would greatly benefit from automated pipelines, with an efficient CMR image analysis workflow. The purpose of this work is to investigate the feasibility of using a fully-automatic pipeline to segment the left ventricular endocardium and epicardium simultaneously on two orthogonal (vertical and horizontal) long-axis cardiac cine MRI scans...
April 13, 2017: Medical Image Analysis
https://www.readbyqxmd.com/read/28432188/magnetic-resonance-neurography-visualizes-abnormalities-in-sciatic-and-tibial-nerves-in-patients-with-type-1-diabetes-and-neuropathy
#3
Michael Vaeggemose, Mirko Pham, Steffen Ringgaard, Hatice Tankisi, Niels Ejskjaer, Sabine Heiland, Per L Poulsen, Henning Andersen
This study evaluates whether diffusion-tensor-imaging MR-Neurography (DTI-MRN), T2-relaxation-time and proton-spin-density can detect and grade neuropathic abnormalities in patients with type 1 diabetes.Forty-nine patients with type 1 diabetes (11 with severe polyneuropathy (sDPN), 13 with mild polyneuropathy (mDPN) and 25 without polyneuropathy (nDPN)) and 30 healthy controls (HC) were included. Clinical examinations, nerve-conduction-studies and vibratory-perception-thresholds determined the presence and severity of DPN...
April 21, 2017: Diabetes
https://www.readbyqxmd.com/read/28431275/learning-non-rigid-deformations-for-robust-constrained-point-based-registration-in-image-guided-mr-trus-prostate-intervention
#4
John A Onofrey, Lawrence H Staib, Saradwata Sarkar, Rajesh Venkataraman, Cayce B Nawaf, Preston C Sprenkle, Xenophon Papademetris
Accurate and robust non-rigid registration of pre-procedure magnetic resonance (MR) imaging to intra-procedure trans-rectal ultrasound (TRUS) is critical for image-guided biopsies of prostate cancer. Prostate cancer is one of the most prevalent forms of cancer and the second leading cause of cancer-related death in men in the United States. TRUS-guided biopsy is the current clinical standard for prostate cancer diagnosis and assessment. State-of-the-art, clinical MR-TRUS image fusion relies upon semi-automated segmentations of the prostate in both the MR and the TRUS images to perform non-rigid surface-based registration of the gland...
April 12, 2017: Medical Image Analysis
https://www.readbyqxmd.com/read/28428212/a-novel-mri-biomarker-of-spinal-cord-white-matter-injury-t2-weighted-white-matter-to-gray-matter-signal-intensity-ratio
#5
A R Martin, B De Leener, J Cohen-Adad, D W Cadotte, S Kalsi-Ryan, S F Lange, L Tetreault, A Nouri, A Crawley, D J Mikulis, H Ginsberg, M G Fehlings
BACKGROUND AND PURPOSE: T2*-weighted imaging provides sharp contrast between spinal cord GM and WM, allowing their segmentation and cross-sectional area measurement. Injured WM demonstrates T2*WI hyperintensity but requires normalization for quantitative use. We introduce T2*WI WM/GM signal-intensity ratio and compare it against cross-sectional area, the DTI metric fractional anisotropy, and magnetization transfer ratio in degenerative cervical myelopathy. MATERIALS AND METHODS: Fifty-eight patients with degenerative cervical myelopathy and 40 healthy subjects underwent 3T MR imaging, covering C1-C7...
April 20, 2017: AJNR. American Journal of Neuroradiology
https://www.readbyqxmd.com/read/28417181/colonic-inflammation-in-pediatric-inflammatory-bowel-disease-detection-with-magnetic-resonance-enterography
#6
Alessandro Campari, Marcello Napolitano, Giovanna Zuin, Luciano Maestri, Giovanni Di Leo, Francesco Sardanelli
BACKGROUND: Colonic involvement in pediatric inflammatory bowel disease is common. Magnetic resonance (MR) enterography is considered the best imaging modality for pediatric inflammatory bowel disease evaluation. It is unclear whether the lack of a dedicated large bowel preparation prevents a reliable colonic assessment. OBJECTIVE: To determine the diagnostic performance of standard MR enterography in detecting and grading colonic inflammatory activity. MATERIALS AND METHODS: We retrospectively evaluated children who underwent both MR enterography and ileocolonoscopy with biopsies <4 weeks apart...
April 17, 2017: Pediatric Radiology
https://www.readbyqxmd.com/read/28408922/a-novel-histogram-region-merging-based-multithreshold-segmentation-algorithm-for-mr-brain-images
#7
Siyan Liu, Xuanjing Shen, Yuncong Feng, Haipeng Chen
Multithreshold segmentation algorithm is time-consuming, and the time complexity will increase exponentially with the increase of thresholds. In order to reduce the time complexity, a novel multithreshold segmentation algorithm is proposed in this paper. First, all gray levels are used as thresholds, so the histogram of the original image is divided into 256 small regions, and each region corresponds to one gray level. Then, two adjacent regions are merged in each iteration by a new designed scheme, and a threshold is removed each time...
2017: International Journal of Biomedical Imaging
https://www.readbyqxmd.com/read/28405900/evaluation-of-pre-surgical-models-for-uterine-surgery-by-use-of-three-dimensional-printing-and-mold-casting
#8
Sayed Ahmad Zikri Bin Sayed Aluwee, Xiangrong Zhou, Hiroki Kato, Hiroshi Makino, Chisako Muramatsu, Takeshi Hara, Masayuki Matsuo, Hiroshi Fujita
We propose an approach to supporting pre-surgical planning for the uterus by integrating medical image analysis and physical model generation based on 3D printing. With our method, we first segment the patient-specific anatomy and lesions of the uterus on MR images; then, we create a 3D physical model, an exact replica of the patient's uterus in terms of size and softness, with transparency for easy observation of the internal structures of the uterus. In our experiments, we created pre-surgical models of hysterectomy for five patients who had been diagnosed to have uterine endometrial cancer...
April 12, 2017: Radiological Physics and Technology
https://www.readbyqxmd.com/read/28401265/dynamic-contrast-enhanced-mr-imaging-in-osteoid-osteoma-relationships-with-clinical-and-ct-characteristics
#9
P Pottecher, E Sibileau, S Aho, B Hamze, C Parlier, J D Laredo, V Bousson
OBJECTIVE: To correlate dynamic contrast-enhanced magnetic resonance imaging (DCE-MRI) features to clinical and computed tomography (CT) morphological features of osteoid osteoma (OO). MATERIALS AND METHODS: Our institutional review board approved this retrospective study, waiving the need for informed consent. We included the 102 patients treated with interstitial laser ablation for histologically documented OO at our institution in 2008-2013. DCE-MRI variables were the time-enhancement pattern and rising slope (Sloperise) and CT variables were the bone and segment involved (OObone and OOsegment, respectively), OO location relative to the native cortex (OOcortex), nidus surface area, vessel sign, and largest neighboring-vessel diameter (Dmaxvessel)...
April 11, 2017: Skeletal Radiology
https://www.readbyqxmd.com/read/28399432/graph-cut-based-method-for-segmenting-the-left-ventricle-from-mri-or-echocardiographic-images
#10
Michael Bernier, Pierre-Marc Jodoin, Olivier Humbert, Alain Lalande
In this paper, we present a fast and interactive graph cut method for 3D segmentation of the endocardial wall of the left ventricle (LV) adapted to work on two of the most widely used modalities: magnetic resonance imaging (MRI) and echocardiography. Our method accounts for the fundamentally different nature of both modalities: 3D echocardiographic images have a low contrast, a poor signal-to-noise ratio and frequent signal drop, while MR images are more detailed but also cluttered and contain highly anisotropic voxels...
April 2, 2017: Computerized Medical Imaging and Graphics: the Official Journal of the Computerized Medical Imaging Society
https://www.readbyqxmd.com/read/28398710/additional-values-of-high-resolution-gadoxetic-acid-enhanced-mr-cholangiography-for-evaluating-the-biliary-anatomy-of-living-liver-donors-comparison-with-t2-weighted-mr-cholangiography-and-conventional-gadoxetic-acid-enhanced-mr-cholangiography
#11
Hyo-Jin Kang, Jeong Min Lee, Jeong Hee Yoon, Ijin Joo, Won Chang, Kyung-Suk Suh, Kwang-Woong Lee, Nam-Joon Yi, Joon Koo Han
PURPOSE: To determine the incremental value of small field of view (sFOV) high-resolution (HR) gadoxetic acid-enhanced 3D T1 -weighted (W) magnetic resonance cholangiography (MRC) for evaluating the biliary anatomy of potential living donors by comparing it to T2 W-MRC. MATERIALS AND METHODS: In all, 73 living donor candidates underwent gadoxetic acid-enhanced MRI (3.0T) including three kinds of MRCs: 3D multislice T2 W-MRC, regular FOV (rFOV) (380 × 380mm, resolution 1...
April 11, 2017: Journal of Magnetic Resonance Imaging: JMRI
https://www.readbyqxmd.com/read/28385884/classification-of-high-grade-glioma-into-tumor-and-nontumor-components-using-support-vector-machine
#12
D T Blumenthal, M Artzi, G Liberman, F Bokstein, O Aizenstein, D Ben Bashat
BACKGROUND AND PURPOSE: Current imaging assessment of high-grade brain tumors relies on the Response Assessment in Neuro-Oncology criteria, which measure gross volume of enhancing and nonenhancing lesions from conventional MRI sequences. These assessments may fail to reliably distinguish tumor and nontumor. This study aimed to classify enhancing and nonenhancing lesion areas into tumor-versus-nontumor components. MATERIALS AND METHODS: A total of 140 MRI scans obtained from 32 patients with high-grade gliomas and 6 patients with brain metastases were included...
April 6, 2017: AJNR. American Journal of Neuroradiology
https://www.readbyqxmd.com/read/28385881/quantitative-measurement-of-csf-in-patients-with-spontaneous-intracranial-hypotension
#13
H-C Chen, P-L Chen, Y-H Tsai, C-H Chen, C C-C Chen, J-W Chai
BACKGROUND AND PURPOSE: CSF hypovolemia is a core feature of spontaneous intracranial hypotension. Spontaneous intracranial hypotension is characterized by orthostatic headache and radiologic manifestations, including CSF along the neural sleeves, diffuse pachymeningeal enhancement, and/or venous engorgement. However, these characteristics are only qualitative. Quantifying intraspinal CSF volumes could improve spontaneous intracranial hypotension diagnosis and evaluation of hypovolemic statuses in patients with spontaneous intracranial hypotension...
April 6, 2017: AJNR. American Journal of Neuroradiology
https://www.readbyqxmd.com/read/28382554/measurement-of-vertebral-bone-marrow-proton-density-fat-fraction-in-children-using-quantitative-water-fat-mri
#14
Stefan Ruschke, Amber Pokorney, Thomas Baum, Holger Eggers, Jeffrey H Miller, Houchun H Hu, Dimitrios C Karampinos
OBJECTIVES: To investigate the feasibility of employing a 3D time-interleaved multi-echo gradient-echo (TIMGRE) sequence to measure the proton density fat fraction (PDFF) in the vertebral bone marrow (VBM) of children and to examine cross-sectional changes with age and intra-individual variations from the lumbar to the cervical region in the first two decades of life. MATERIALS AND METHODS: Quantitative water-fat imaging of the spine was performed in 93 patients (49 girls; 44 boys; age median 4...
April 5, 2017: Magma
https://www.readbyqxmd.com/read/28382379/posttreatment-dsc-mri-is-predictive-of-early-treatment-failure-in-children-with-supratentorial-high-grade-glioma-treated-with-erlotinib
#15
John T Lucas, Brendan J Knapp, Jinsoo Uh, Chia-Ho Hua, Thomas E Merchant, Scott N Hwang, Zoltan Patay, Alberto Broniscer
BACKGROUND AND PURPOSE: The role of perfusion imaging in the management of pediatric high grade glioma is unclear. We evaluated the ability of dynamic susceptibility contrast magnetic resonance imaging (DSC-MRI) to determine grade, evaluate post-treatment response and predict treatment failure. MATERIAL AND METHODS: In this study 22 patients with high-grade glioma underwent biopsy and were treated with concurrent and sequential radiotherapy and erlotinib as part of a phase I/II clinical trial (NCT00124657)...
April 5, 2017: Clinical Neuroradiology
https://www.readbyqxmd.com/read/28377351/-segmentation-of-the-prostate-on-magnetic-resonance-images-using-an-ellipsoidal-shape-prior-constraint-algorithm
#16
Xue-Li Li, Shu-Mao Pang, Wei Yang, Qian-Jin Feng
We propose a novel strategy for multi-atlas-based image segmentation of the prostate on magnetic resonance (MR) images using an ellipsoidal shape prior constraint algorithm. An ellipsoidal shape prior constraint was incorporated into the process of multi-atlas based segmentation to restrict the regions of interest on the prostate images and avoid the interference by the surrounding tissues and organs in atlas selection. In the subsequent process of atlas fusion, the ellipsoidal shape prior constraint calibrated and compensated for the shape prior obtained by the registration technique to avoid incorrect segmentation caused by registration errors...
March 20, 2017: Nan Fang Yi Ke da Xue Xue Bao, Journal of Southern Medical University
https://www.readbyqxmd.com/read/28376124/active-contours-driven-by-local-and-global-fitted-image-models-for-image-segmentation-robust-to-intensity-inhomogeneity
#17
Farhan Akram, Miguel Angel Garcia, Domenec Puig
This paper presents a region-based active contour method for the segmentation of intensity inhomogeneous images using an energy functional based on local and global fitted images. A square image fitted model is defined by using both local and global fitted differences. Moreover, local and global signed pressure force functions are introduced in the solution of the energy functional to stabilize the gradient descent flow. In the final gradient descent solution, the local fitted term helps extract regions with intensity inhomogeneity, whereas the global fitted term targets homogeneous regions...
2017: PloS One
https://www.readbyqxmd.com/read/28375584/fully-automated-segmentation-of-whole-breast-using-dynamic-programming-in-dynamic-contrast-enhanced-mr-images
#18
Luan Jiang, Xiaoxin Hu, Qin Xiao, Yajia Gu, Qiang Li
PURPOSE: Amount of fibroglandular tissue (FGT) and level of background parenchymal enhancement (BPE) in breast dynamic contrast enhanced magnetic resonance images (DCE-MRI) are suggested as strong indices for assessing breast cancer risk. Whole breast segmentation is the first important task for quantitative analysis of FGT and BPE in three-dimensional (3-D) DCE-MRI. The purpose of this study is to develop and evaluate a fully automated technique for accurate segmentation of the whole breast in 3-D fat-suppressed DCE-MRI...
April 4, 2017: Medical Physics
https://www.readbyqxmd.com/read/28371110/computer-aided-heterogeneity-analysis-in-breast-mr-imaging-assessment-of-ductal-carcinoma-in-situ-correlating-histologic-grade-and-receptor-status
#19
Shinn-Huey S Chou, Eva C Gombos, Sona A Chikarmane, Catherine S Giess, Jagadeesan Jayender
PURPOSE: To identify breast MR imaging biomarkers to predict histologic grade and receptor status of ductal carcinoma in situ (DCIS). MATERIALS AND METHODS: Informed consent was waived in this Health Insurance Portability and Accountability Act-compliant Institutional Review Board-approved study. Case inclusion was conducted from 7332 consecutive breast MR studies from January 1, 2009, to December 31, 2012. Excluding studies with benign diagnoses, studies without visible abnormal enhancement, and pathology containing invasive disease yielded 55 MR-imaged pathology-proven DCIS seen on 54 studies...
April 3, 2017: Journal of Magnetic Resonance Imaging: JMRI
https://www.readbyqxmd.com/read/28370909/early-marker-of-regional-left-ventricular-deformation-in-patients-with-hypertrophic-cardiomyopathy-evaluated-by-mri-tissue-tracking-the-effects-of-myocardial-hypertrophy-and-fibrosis
#20
Hua-Yan Xu, Jing Chen, Zhi-Gang Yang, Rui Li, Ke Shi, Qin Zhang, Xi Liu, Lin-Jun Xie, Li Jiang, Ying-Kun Guo
PURPOSE: To evaluate the regional left ventricular (LV) myocardial strain of early stage hypertrophic cardiomyopathy (HCM) patients by magnetic resonance (MR) tissue tracking. MATERIALS AND METHODS: In all, 114 adult HCM patients classified as NYHA I or II and 32 healthy volunteers were enrolled and underwent 3.0T MR examination. Vertical 2-chamber long axis, horizontal 4-chamber, and short axis cine sequence as well as late gadolinium enhancement images (LGE) were scanned...
March 29, 2017: Journal of Magnetic Resonance Imaging: JMRI
keyword
keyword
114724
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"