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MR image segmentation

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https://www.readbyqxmd.com/read/28526430/combination-of-integrated-dynamic-shimming-and-readout-segmented-echo-planar-imaging-for-diffusion-weighted-mri-of-the-head-and-neck-region-at-3tesla
#1
Sven S Walter, Wei Liu, Alto Stemmer, Petros Martirosian, Konstantin Nikolaou, Mike Notohamiprodjo, Sergios Gatidis
PURPOSE: To evaluate the performance of combined integrated slice-by-slice shimming and readout-segmented EPI (irsEPI) for diffusion-weighted MR imaging (DWI) of the neck at 3Tesla. METHODS: This study was approved by the local ethics committee. An anthropometric phantom of the head/neck region incorporating compartments with different diffusivities was constructed. In vivo measurements were performed in 10 healthy volunteers. DWI of the phantom and volunteers was performed on a 3Tesla MR scanner using single shot EPI (sEPI), a prototype single shot EPI with integrated slice-by-slice shimming (iEPI), readout segmented EPI (rsEPI) and a prototype readout segmented EPI with integrated shimming irsEPI...
May 16, 2017: Magnetic Resonance Imaging
https://www.readbyqxmd.com/read/28526212/3d-deeply-supervised-network-for-automated-segmentation-of-volumetric-medical-images
#2
Qi Dou, Lequan Yu, Hao Chen, Yueming Jin, Xin Yang, Jing Qin, Pheng-Ann Heng
While deep convolutional neural networks (CNNs) have achieved remarkable success in 2D medical image segmentation, it is still a difficult task for CNNs to segment important organs or structures from 3D medical images owing to several mutually affected challenges, including the complicated anatomical environments in volumetric images, optimization difficulties of 3D networks and inadequacy of training samples. In this paper, we present a novel and efficient 3D fully convolutional network equipped with a 3D deep supervision mechanism to comprehensively address these challenges; we call it 3D DSN...
May 8, 2017: Medical Image Analysis
https://www.readbyqxmd.com/read/28525662/imaging-technologies-in-the-diagnosis-and-treatment-of-acute-pyelonephritis
#3
Dmitry V Enikeev, Petr Glybochko, Yuriy Alyaev, Mikhail Enikeev, Leonid Rapoport
PURPOSE: The aim of this study was to evaluate the possibilities of ultrasound, computed tomography (CT) and magnetic resonance imaging (MRI) in diagnosing acute pyelonephritis (AP) and renal abscess. PATIENTS AND METHODS: Two hundred and seven patients with AP were followed up from 2010 throughout 2015. All the patients were divided into three groups. Group 1 included 113 (54.6%) patients with acute nonobstructive pyelonephritis; group 2 included 33 (15.9%) patients with acute obstructive pyelonephritis; and group 3 included 61 (29...
May 18, 2017: Urologia
https://www.readbyqxmd.com/read/28521823/t1rho-and-t2-relaxation-times-of-the-normal-adult-knee-meniscus-at-3t-analysis-of-zonal-differences
#4
Shoichiro Takao, Tan B Nguyen, Hon J Yu, Shigeo Hagiwara, Yasuhito Kaneko, Taiki Nozaki, Seiji Iwamoto, Maki Otomo, Ran Schwarzkopf, Hiroshi Yoshioka
BACKGROUND: Prior studies describe histological and immunohistochemical differences in collagen and proteoglycan content in different meniscal zones. The aim of this study is to evaluate horizontal and vertical zonal differentiation of T1rho and T2 relaxation times of the entire meniscus from volunteers without symptom and imaging abnormality. METHODS: Twenty volunteers age between 19 and 38 who have no knee-related clinical symptoms, and no history of prior knee surgeries were enrolled in this study...
May 18, 2017: BMC Musculoskeletal Disorders
https://www.readbyqxmd.com/read/28515409/saturation-recovery-myocardial-t1-mapping-with-a-composite-radiofrequency-pulse-on-a-3t-mr-imaging-system
#5
Kosuke Morita, Seitaro Oda, Daisuke Utsunomiya, Takeshi Nakaura, Takatoshi Matsubara, Makoto Goto, Tomoyuki Okuaki, Hideaki Yuki, Yasunori Nagayama, Masafumi Kidoh, Kenichiro Hirata, Yuij Iyama, Narumi Taguchi, Masahiro Hatemura, Masahiro Hashida, Yasuyuki Yamashita
PURPOSE: To evaluate the effect of a composite radiofrequency (RF) pulse on saturation recovery (SR) myocardial T1 mapping using a 3T magnetic resonance (MR) system. MATERIALS AND METHODS: Phantom and in vivo studies were performed with a clinical 3T MR scanner. Accuracy and reproducibility of the SR T1 mapping using conventional and composite RF pulses were first compared in phantom experiments. An in vivo study was performed of 10 healthy volunteers who were imaged with conventional and composite RF pulse methods twice each...
May 18, 2017: Magnetic Resonance in Medical Sciences: MRMS
https://www.readbyqxmd.com/read/28507825/spatiotemporal-strategies-for-joint-segmentation-and-motion-tracking-from-cardiac-image-sequences
#6
Huafeng Liu, Ting Wang, Lei Xu, Pengcheng Shi
Although accurate and robust estimations of the deforming cardiac geometry and kinematics from cine tomographic medical image sequences remain a technical challenge, they have significant clinical value. Traditionally, boundary or volumetric segmentation and motion estimation problems are considered as two sequential steps, even though the order of these processes can be different. In this paper, we present an integrated, spatiotemporal strategy for the simultaneous joint recovery of these two ill-posed problems...
2017: IEEE Journal of Translational Engineering in Health and Medicine
https://www.readbyqxmd.com/read/28501699/the-ages-reykjavik-study-atlases-non-linear-multi-spectral-template-and-atlases-for-studies-of-the-ageing-brain
#7
Lars Forsberg, Sigurdur Sigurdsson, Jesper Fredriksson, Asdis Egilsdottir, Bryndis Oskarsdottir, Olafur Kjartansson, Mark A van Buchem, Lenore J Launer, Vilmundur Gudnason, Alex Zijdenbos
Quantitative analyses of brain structures from Magnetic Resonance (MR) image data are often performed using automatic segmentation algorithms. Many of these algorithms rely on templates and atlases in a common coordinate space. Most freely available brain atlases are generated from relatively young individuals and not always derived from well-defined cohort studies. In this paper, we introduce a publicly available multi-spectral template with corresponding tissue probability atlases and regional atlases, optimised to use in studies of ageing cohorts (mean age 75 ± 5 years)...
May 6, 2017: Medical Image Analysis
https://www.readbyqxmd.com/read/28501580/can-the-acute-mri-features-reflect-neurological-prognosis-in-patients-with-cervical-spinal-cord-injury
#8
Akinobu Matsushita, Takeshi Maeda, Eiji Mori, Itaru Yuge, Osamu Kawano, Takayoshi Ueta, Keiichiro Shiba
BACKGROUND CONTEXT: Several prognostic studies looked for an association between the degree of SCI, as depicted by primary MRI within 72 hours of injury, and neurologic outcome.It was not clearly demonstrated whether the MRI at any time is to correlate with neurological prognosis. PURPOSE: The purpose of the present study was to investigate the relationship between the acute MRI features and neurological prognosis, especially walking ability of patients with cervical spinal cord injury (CSCI)...
May 10, 2017: Spine Journal: Official Journal of the North American Spine Society
https://www.readbyqxmd.com/read/28501269/peak-enhancement-ratio-of-myocardium-to-aorta-for-identification-of-myocardial-ischemia-using-dynamic-myocardial-computed-tomography-perfusion-imaging
#9
Yuki Tanabe, Teruhito Kido, Akira Kurata, Takahiro Yokoi, Naoki Fukuyama, Teruyoshi Uetani, Hikaru Nishiyama, Naoto Kawaguchi, Enver Tahir, Masao Miyagawa, Teruhito Mochizuki
BACKGROUND: This study aimed to evaluate the feasibility of peak enhancement (PE) ratio of myocardium to aorta (PER) derived from stress dynamic computed tomography myocardial perfusion imaging (CTP) for the detection of myocardial ischemia assessed by magnetic resonance (MR) imaging. METHODS: Forty-four patients who underwent stress dynamic CTP and MR imaging were retrospectively evaluated. From the time-attenuation curve, myocardial PE, PER, and myocardial blood flow (MBF) were calculated on a segment-based analysis...
May 10, 2017: Journal of Cardiology
https://www.readbyqxmd.com/read/28499438/early-developed-asd-adjacent-segmental-disease-in-patients-after-surgical-treatment-of-the-spine-due-to-cancer-metastases
#10
Grzegorz Guzik
BACKGROUND: The causes of ASD are still relatively unknown. Correlation between clinical status of patients and radiological MRI findings is of primary importance. The radiological classifications proposed by Pfirmann and Oner are most commonly used to assess intradiscal degenerative changes. The aim of the study was to assess the influence of the extension of spine fixation on the risk of developing ASD in a short time after surgery. METHODS: A total of 332 patients with spinal tumors were treated in our hospital between 2010 and 2013...
May 12, 2017: Journal of Orthopaedic Surgery and Research
https://www.readbyqxmd.com/read/28498794/diagnosis-of-normal-pressure-hydrocephalus-use-of-traditional-measures-in-the-era-of-volumetric-mr-imaging
#11
Nityanand Miskin, Hersh Patel, Ana M Franceschi, Benjamin Ades-Aron, Alexander Le, Brianna E Damadian, Christian Stanton, Yafell Serulle, James Golomb, Oded Gonen, Henry Rusinek, Ajax E George
Purpose To assess the diagnostic performance of the callosal angle (CA) and Evans index (EI) measures and to determine their role versus automated volumetric methods in clinical radiology. Materials and Methods Magnetic resonance (MR) examinations performed before surgery (within 1-5 months of the MR examination) in 36 shunt-responsive patients with normal-pressure hydrocephalus (NPH; mean age, 75 years; age range, 58-87 years; 26 men, 10 women) and MR examinations of age- and sex-matched patients with Alzheimer disease (n = 34) and healthy control volunteers (n = 36) were studied...
May 10, 2017: Radiology
https://www.readbyqxmd.com/read/28497643/three-dimensional-ultrashort-echo-time-mri-and-short-t2-images-generated-from-subtraction-for-determination-of-tumor-burden-in-lung-cancer-preclinical-investigation-in-transgenic-mice
#12
Andreas Müller, Philippe Jagoda, Peter Fries, Stefan Gräber, Robert Bals, Arno Buecker, Christopher Jungnickel, Christoph Beisswenger
PURPOSE: To investigate the potential of 3D ultrashort echo time MRI and short T2 images generated by subtraction for determination of total tumor burden in lung cancer. METHODS: As an animal model of spontaneously developing non-small cell lung cancer, the K-rasLA1 transgenic mouse was used. Three-dimensional MR imaging was performed with radial k-space acquisition and echo times of 20 µs and 1 ms. For investigation of the short T2 component in the recorded signal, subtraction images were generated from these data sets and used for consensus identification of tumors...
May 11, 2017: Magnetic Resonance in Medicine: Official Journal of the Society of Magnetic Resonance in Medicine
https://www.readbyqxmd.com/read/28495008/a-fully-automatic-approach-for-multimodal-pet-and-mr-image-segmentation-in-gamma-knife-treatment-planning
#13
Leonardo Rundo, Alessandro Stefano, Carmelo Militello, Giorgio Russo, Maria Gabriella Sabini, Corrado D'Arrigo, Francesco Marletta, Massimo Ippolito, Giancarlo Mauri, Salvatore Vitabile, Maria Carla Gilardi
BACKGROUND AND OBJECTIVES: Nowadays, clinical practice in Gamma Knife treatments is generally based on MRI anatomical information alone. However, the joint use of MRI and PET images can be useful for considering both anatomical and metabolic information about the lesion to be treated. In this paper we present a co-segmentation method to integrate the segmented Biological Target Volume (BTV), using [(11)C]-Methionine-PET (MET-PET) images, and the segmented Gross Target Volume (GTV), on the respective co-registered MR images...
June 2017: Computer Methods and Programs in Biomedicine
https://www.readbyqxmd.com/read/28493526/real-time-mri-guidance-of-cardiac-interventions
#14
Adrienne E Campbell-Washburn, Mohammad A Tavallaei, Mihaela Pop, Elena K Grant, Henry Chubb, Kawal Rhode, Graham A Wright
Cardiac magnetic resonance imaging (MRI) is appealing to guide complex cardiac procedures because it is ionizing radiation-free and offers flexible soft-tissue contrast. Interventional cardiac MR promises to improve existing procedures and enable new ones for complex arrhythmias, as well as congenital and structural heart disease. Guiding invasive procedures demands faster image acquisition, reconstruction and analysis, as well as intuitive intraprocedural display of imaging data. Standard cardiac MR techniques such as 3D anatomical imaging, cardiac function and flow, parameter mapping, and late-gadolinium enhancement can be used to gather valuable clinical data at various procedural stages...
May 11, 2017: Journal of Magnetic Resonance Imaging: JMRI
https://www.readbyqxmd.com/read/28493478/three-dimensional-models-of-the-segmented-human-fetal-brain-generated-by-magnetic-resonance-imaging
#15
Yutaka Yamaguchi, Reina Miyazaki, Mikako Kamatani, Chigako Uwabe, Haruyuki Makishima, Momoko Nagai, Motoki Katsube, Akira Yamamoto, Hirohiko Imai, Katsumi Kose, Kaori Togashi, Shigehito Yamada
Recent advances in imaging technology have enabled us to obtain more detailed images of the human fetus in a nondestructive and noninvasive manner. Through detailed images, elaborate three-dimensional (3D) models of the developing brain can be reconstructed. The segmentation of the developing brain has been determined by serial sections. Therefore, in this study, we attempted to develop a 3D model of the fetal brain using magnetic resonance image (MRI). MR images from 19 specimens (11 embryonic specimens and eight fetal specimens from 5...
May 11, 2017: Congenital Anomalies
https://www.readbyqxmd.com/read/28489309/isotropic-three-dimensional-t2-mapping-of-knee-cartilage-development-and-validation
#16
Roberto Colotti, Patrick Omoumi, Gabriele Bonanno, Jean-Baptiste Ledoux, Ruud B van Heeswijk
PURPOSE: 1) To implement a higher-resolution isotropic 3D T2 mapping technique that uses sequential T2 -prepared segmented gradient-recalled echo (Iso3DGRE) images for knee cartilage evaluation, and 2) to validate it both in vitro and in vivo in healthy volunteers and patients with knee osteoarthritis. MATERIALS AND METHODS: The Iso3DGRE sequence with an isotropic 0.6 mm spatial resolution was developed on a clinical 3T MR scanner. Numerical simulations were performed to optimize the pulse sequence parameters...
May 10, 2017: Journal of Magnetic Resonance Imaging: JMRI
https://www.readbyqxmd.com/read/28488044/bilateral-carotid-anterior-cerebral-artery-anastomoses-associated-with-bilateral-ophthalmic-arteries-arising-from-the-middle-meningeal-arteries-diagnosed-by-magnetic-resonance-angiography-a-case-report
#17
Akira Uchino, Naoko Saito, Fumitaka Yamane
Anastomosis between the ophthalmic segment of the internal carotid artery and the A1-A2 junction of the anterior cerebral artery (ACA), described as carotid-ACA anastomosis or infraoptic course of the ACA, is rare and known to demonstrate right-sided predominance. We report a case of bilateral carotid-ACA anastomoses associated with bilateral ophthalmic arteries arising from the sphenoidal branch of the middle meningeal artery that were diagnosed by magnetic resonance (MR) angiography. Identification of rare arterial variations on MR angiography requires careful scrutiny of source images...
May 9, 2017: Surgical and Radiologic Anatomy: SRA
https://www.readbyqxmd.com/read/28480581/automatic-quantification-of-bone-marrow-edema-on-mri-of-the-wrist-in-patients-with-early-arthritis-a-feasibility-study
#18
Evgeni Aizenberg, Edgar A H Roex, Wouter P Nieuwenhuis, Lukas Mangnus, Annette H M van der Helm-van Mil, Monique Reijnierse, Johan L Bloem, Boudewijn P F Lelieveldt, Berend C Stoel
PURPOSE: To investigate the feasibility of automatic quantification of bone marrow edema (BME) on MRI of the wrist in patients with early arthritis. METHODS: For 485 early arthritis patients (clinically confirmed arthritis of one or more joints, symptoms for less than 2 years), MR scans of the wrist were processed in three automatic stages. First, super-resolution reconstruction was applied to fuse coronal and axial scans into a single high-resolution 3D image. Next, the carpal bones were located and delineated using atlas-based segmentation...
May 7, 2017: Magnetic Resonance in Medicine: Official Journal of the Society of Magnetic Resonance in Medicine
https://www.readbyqxmd.com/read/28479476/high-resolution-magnetic-resonance-imaging-reveals-nuclei-of-the-human-amygdala-manual-segmentation-to-automatic-atlas
#19
Z M Saygin, D Kliemann, J E Iglesias, A J W van der Kouwe, E Boyd, M Reuter, A Stevens, K Van Leemput, A McKee, M P Frosch, B Fischl, J C Augustinack
The amygdala is composed of multiple nuclei with unique functions and connections in the limbic system and to the rest of the brain. However, standard in vivo neuroimaging tools to automatically delineate the amygdala into its multiple nuclei are still rare. By scanning postmortem specimens at high resolution (100-150µm) at 7T field strength (n = 10), we were able to visualize and label nine amygdala nuclei (anterior amygdaloid, cortico-amygdaloid transition area; basal, lateral, accessory basal, central, cortical medial, paralaminar nuclei)...
May 4, 2017: NeuroImage
https://www.readbyqxmd.com/read/28473964/t1%C3%AF-t2-mapping-and-histopathology-of-degenerative-cartilage-in-advanced-knee-osteoarthritis
#20
Benjamin S Kester, Philip M Carpenter, Hon J Yu, Taiki Nozaki, Yasuhito Kaneko, Hiroshi Yoshioka, Ran Schwarzkopf
AIM: To investigate whether normal thickness cartilage in osteoarthritic knees demonstrate depletion of proteoglycan or collagen content compared to healthy knees. METHODS: Magnetic resonance (MR) images were acquired from 5 subjects scheduled for total knee arthroplasty (TKA) (mean age 70 years) and 20 young healthy control subjects without knee pain (mean age 28.9 years). MR images of T1ρ mapping, T2 mapping, and fat suppressed proton-density weighted sequences were obtained...
April 18, 2017: World Journal of Orthopedics
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