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Anatomical segmentation

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https://www.readbyqxmd.com/read/28319535/validation-of-therapeutic-anatomy-oriented-classification-in-endosseous-dental-implant-treatment-a-pilot-study
#1
Marius Kubilius, Yagmur Deniz Ilarslan, Tolga F Tözüm, Hom-Lay Wang, Ričardas Kubilius, Gintaras Juodzbalys
BACKGROUND: The purpose of the study was to validate a newly proposed therapeutic anatomically based clinical and radiological classification for dental implant treatment. METHODS: Eighty-one patients with at least 1 edentulous jaw segment (EJS) from 2 dental clinics were included in this study. Both clinical and radiological parameters were assessed in aesthetic and nonaesthetic zones. The data were then compared at preoperative, intraoperative, and postoperative (subdivided into early and late stage) study stages...
April 2017: Implant Dentistry
https://www.readbyqxmd.com/read/28318054/efficacy-and-safety-of-targeted-high-intensity-medium-band-304-312-nm-ultraviolet-b-light-in-pediatric-vitiligo
#2
Da-Ke Dong, Zhan-Yan Pan, Juan Zhang, Xue-Fen Lu, Cheng Jin, Shi-Qin Tao, Li-Jia Yang
BACKGROUND/OBJECTIVES: Phototherapy is a commonly used treatment for vitiligo that has demonstrated safety and efficacy. High-intensity targeted ultraviolet B (UVB) light (304-312 nm) delivered using a phototherapy device is a useful therapeutic option because it can induce repigmentation in a short time without global exposure to radiation, but information regarding this device in children is limited. METHODS: We performed a retrospective analysis of 95 patches of vitiligo in 27 children treated using a targeted phototherapy device...
March 20, 2017: Pediatric Dermatology
https://www.readbyqxmd.com/read/28317116/anatomical-segmentation-of-the-human-medial-prefrontal-cortex
#3
M Córcoles-Parada, Ncj Müller, M Ubero, V M Serrano-Del-Pueblo, F Mansilla, P Marcos-Rabal, E Artacho-Pérula, M Dresler, R Insausti, G Fernández, M Muñoz-López
The medial prefrontal areas 32, 24, 14, and 25 (mPFC) form part of the limbic memory system, but little is known about their functional specialization in humans. To add anatomical precision to structural and functional MRI data, we aimed to identify these mPFC subareas in histological preparations of human brain tissue, determine sulci most consistently related with mPFC areal boundaries, and use these sulci to delineate mPFC areas in MRIs. To achieve this, we obtained 3D MRI data from 11 ex vivo hemispheres and processed them for cyto- and myelo-architectonic analysis...
March 20, 2017: Journal of Comparative Neurology
https://www.readbyqxmd.com/read/28316992/a-combined-random-forests-and-active-contour-model-approach-for-fully-automatic-segmentation-of-the-left-atrium-in-volumetric-mri
#4
Chao Ma, Gongning Luo, Kuanquan Wang
Segmentation of the left atrium (LA) from cardiac magnetic resonance imaging (MRI) datasets is of great importance for image guided atrial fibrillation ablation, LA fibrosis quantification, and cardiac biophysical modelling. However, automated LA segmentation from cardiac MRI is challenging due to limited image resolution, considerable variability in anatomical structures across subjects, and dynamic motion of the heart. In this work, we propose a combined random forests (RFs) and active contour model (ACM) approach for fully automatic segmentation of the LA from cardiac volumetric MRI...
2017: BioMed Research International
https://www.readbyqxmd.com/read/28316979/a-registration-method-based-on-contour-point-cloud-for-3d-whole-body-pet-and-ct-images
#5
Zhiying Song, Huiyan Jiang, Qiyao Yang, Zhiguo Wang, Guoxu Zhang
The PET and CT fusion image, combining the anatomical and functional information, has important clinical meaning. An effective registration of PET and CT images is the basis of image fusion. This paper presents a multithread registration method based on contour point cloud for 3D whole-body PET and CT images. Firstly, a geometric feature-based segmentation (GFS) method and a dynamic threshold denoising (DTD) method are creatively proposed to preprocess CT and PET images, respectively. Next, a new automated trunk slices extraction method is presented for extracting feature point clouds...
2017: BioMed Research International
https://www.readbyqxmd.com/read/28316884/three-dimensional-visualisation-of-the-internal-anatomy-of-the-sparrowhawk-accipiter-nisus-forelimb-using-contrast-enhanced-micro-computed-tomography
#6
Fernanda Bribiesca-Contreras, William I Sellers
BACKGROUND: Gross dissection is a widespread method for studying animal anatomy, despite being highly destructive and time-consuming. X-ray computed tomography (CT) has been shown to be a non-destructive alternative for studying anatomical structures. However, in the past it has been limited to only being able to visualise mineralised tissues. In recent years, morphologists have started to use traditional X-ray contrast agents to allow the visualisation of soft tissue elements in the CT context...
2017: PeerJ
https://www.readbyqxmd.com/read/28306496/use-of-magnetic-resonance-imaging-guided-biopsy-of-a-vertebral-body-mass-to-diagnose-osteosarcoma-in-a-rottweiler
#7
Rebecca A Krimins, Jan Fritz, Larry A Gainsburg, Patrick R Gavin, Elizabeth A Ihms, David L Huso, Dara L Kraitchman
CASE DESCRIPTION A 9-year-old spayed female Rottweiler with hind limb ataxia was examined because of anorexia and an acute onset of hind limb paresis. CLINICAL FINDINGS Neurologic evaluation revealed hind limb ataxia and symmetric paraparesis with bilaterally abnormal hind limb postural reactions including hopping, hemiwalking, hemistanding, and delayed proprioception, which were suggestive of a lesion somewhere in the T3-L3 segment of the spinal cord. Thoracolumbar radiography revealed an abnormal radiopacity suggestive of a mass at T11...
April 1, 2017: Journal of the American Veterinary Medical Association
https://www.readbyqxmd.com/read/28302606/trochlear-groove-and-trochlear-cistern-useful-anatomic-landmarks-for-identifying-the-tentorial-segment-of-cranial-nerve-iv-on-mri
#8
P M Bunch, H R Kelly, D A Zander, H D Curtin
BACKGROUND AND PURPOSE: The trochlear groove and trochlear cistern are anatomic landmarks closely associated with the tentorial segment of cranial nerve IV. The purposes of this study were to describe the MR imaging appearances of the trochlear groove and trochlear cistern and to test our hypothesis that knowledge of these anatomic landmarks facilitates identification of cranial nerve IV in routine clinical practice. MATERIALS AND METHODS: For this retrospective study, consecutive MR imaging examinations of the sinuses performed in 25 patients (50 sides) at our institution were reviewed...
March 16, 2017: AJNR. American Journal of Neuroradiology
https://www.readbyqxmd.com/read/28301777/vertebral-body-compression-fractures-and-bone-density-automated-detection-and-classification-on-ct-images
#9
Joseph E Burns, Jianhua Yao, Ronald M Summers
Purpose To create and validate a computer system with which to detect, localize, and classify compression fractures and measure bone density of thoracic and lumbar vertebral bodies on computed tomographic (CT) images. Materials and Methods Institutional review board approval was obtained, and informed consent was waived in this HIPAA-compliant retrospective study. A CT study set of 150 patients (mean age, 73 years; age range, 55-96 years; 92 women, 58 men) with (n = 75) and without (n = 75) compression fractures was assembled...
March 16, 2017: Radiology
https://www.readbyqxmd.com/read/28301734/deep-learning-in-medical-image-analysis
#10
Dinggang Shen, Guorong Wu, Heung-Il Suk
This review covers computer-assisted analysis of images in the field of medical imaging. Recent advances in machine learning, especially with regard to deep learning, are helping to identify, classify, and quantify patterns in medical images. At the core of these advances is the ability to exploit hierarchical feature representations learned solely from data, instead of features designed by hand according to domain-specific knowledge. Deep learning is rapidly becoming the state of the art, leading to enhanced performance in various medical applications...
March 9, 2017: Annual Review of Biomedical Engineering
https://www.readbyqxmd.com/read/28299273/guidelines-for-patient-specific-jawline-definition-with-titanium-implants-in-esthetic-deformity-and-malformation-surgery
#11
Maurice Yves Mommaerts
CONTEXT: Asymmetry and unfavorable esthetics of the jawline have become possible to correct in three dimensions using computer aided design and computer aided manufacturing. AIMS: The aim of this study was to provide esthetic, technical, and operative guidelines for mandibular angle and border augmentation using patient-specific titanium implants made by selective laser melting. SETTINGS AND DESIGN: University hospital - prospective registry...
July 2016: Annals of Maxillofacial Surgery
https://www.readbyqxmd.com/read/28299225/thrombosis-of-the-azygos-anterior-cerebral-artery
#12
Camila Soares Moreira de Sousa, Carla Lorena Vasques Mendes de Miranda, Marcelo Coelho Avelino, Breno Braga Bastos, Rafael Soares Moreira de Sousa, Carla Valéria Vasques Mendes de Miranda
The azygos anterior cerebral artery is a rare variant, characterized by the absence of the anterior communicating artery and the union of two proximal segments of the anterior cerebral artery, forming a single trunk and ascending through the interhemispheric fissure. The incidence in the population varies from 0.3 to 2%. The presence of occlusion for this vessel causes bifrontal infarcts, with potentially devastating functional consequences, hence the importance of recognizing this anatomical variation in imaging exams...
2017: Case Reports in Radiology
https://www.readbyqxmd.com/read/28298033/diffusion-tractography-imaging-guided-frameless-linear-accelerator-stereotactic-radiosurgical-thalamotomy-for-tremor-case-report
#13
Won Kim, Justin Sharim, Stephen Tenn, Tania Kaprealian, Yvette Bordelon, Nzhde Agazaryan, Nader Pouratian
Essential tremor and Parkinson's disease-associated tremor are extremely prevalent within the field of movement disorders. The ventral intermediate (VIM) nucleus of the thalamus has been commonly used as both a neuromodulatory and neuroablative target for the treatment of these forms of tremor. With both deep brain stimulation and Gamma Knife radiosurgery, there is an abundance of literature regarding the surgical planning, targeting, and outcomes of these methodologies. To date, there have been no reports of frameless, linear accelerator (LINAC)-based thalomotomies for tremor...
February 24, 2017: Journal of Neurosurgery
https://www.readbyqxmd.com/read/28296812/pedicled-vascularized-clavicular-graft-for-anterior-cervical-arthrodesis-cadaveric-feasibility-study-technique-description-and-case-report
#14
Michael A Bohl, Michael A Mooney, Joshua S Catapano, Kaith K Almefty, Mark C Preul, Steve W Chang, U Kumar Kakarla, Edward M Reece, Jay D Turner, Randall W Porter
STUDY DESIGN: Cadaveric feasibility study. OBJECTIVES: To assess the anatomic and technical feasibility of rotating a clavicular segment on a sternocleidomastoid muscle (SCM) pedicle into the ventral cervical spine using a cadaveric model and to provide the first clinical case description of performing this procedure. SUMMARY OF BACKGROUND DATA: Reconstruction of the anterior cervical spine in patients with a high risk of pseudoarthrosis may require the use of a vascularized bone graft (VBG)...
March 14, 2017: Spine
https://www.readbyqxmd.com/read/28295313/peripheral-and-central-anatomical-organization-of-cutaneous-afferent-subtypes-in-a-rat-nociceptive-intersegmental-spinal-reflex
#15
Hyun Joon Lee, Jason M White, Jumi Chung, Keith E Tansey
Stimulation of rat segmental dorsal cutaneous nerves (DCNs) evokes the nociceptive intersegmental cutaneus trunci muscle (CTM) reflex. The reflex consists of early and late responses, mediated by Aδ and C fibers respectively based on required stimulation strengths, and shows segmental differences in terms of amplitude and duration. We have now investigated whether the peripheral or central anatomy of nociceptive afferent subtypes in different DCNs also vary in a segmental manner. The numbers of different axon subtypes, determined by axon diameter, were analyzed across peripheral DCNs from T6 to L1...
March 11, 2017: Journal of Comparative Neurology
https://www.readbyqxmd.com/read/28294197/cone-beam-analysis-of-the-buccal-bone-associated-%C3%A2-with-a-dental-implant-a-tridimensional-assessment-case-report
#16
Oscar González-Martín, Mario Veltri, Cert Perio
OBJECTIVE: This case report presents cone beam computed tomography (CBCT) three-dimensional (3D) assessment of the buccal bone associated with an implant. METHOD AND MATERIALS: A patient who had immediate implant replacement of a maxillary incisor received a CBCT examination after 6 months. The scanned volume was then subjected to segmentation of the buccal bone associated with the implant and to its three-dimensional rendering. RESULTS: Virtual reconstruction allowed volumetric assessment of the buccal plate, and of the buccal marginal bone level...
March 14, 2017: Quintessence International
https://www.readbyqxmd.com/read/28293503/near-complete-humerus-reconstruction-in-the-pediatric-patient-with-vascularized-free-fibula-transfer
#17
John Shuck, Benjamin C Wood, Christopher Zarella, Albert K Oh, Robert M Henshaw, Gary F Rogers
Vascularized free fibula transfer remains the gold standard for reconstruction of large segmental diaphyseal defects of the upper extremity. In the pediatric patient, before skeletal maturity, free fibula transfer with the fibular head provides an active physis for growth and an articular interface for glenohumeral joint reconstruction. Clinical and cadaveric studies have demonstrated that the vascular supply to the fibular head originates, in most cases, from the anterior tibial system. However, anatomical variation exists, and we report a case in which a vascularized fibula autograft including the physis was transferred on the peroneal artery in a 5-year-old patient with Ewing's sarcoma...
December 2016: Plastic and Reconstructive Surgery. Global Open
https://www.readbyqxmd.com/read/28291265/t1-weighted-in-vivo-human-whole-brain-mri-dataset-with-an-ultrahigh-isotropic-resolution-of-250-%C3%AE-m
#18
Falk Lüsebrink, Alessandro Sciarra, Hendrik Mattern, Renat Yakupov, Oliver Speck
We present an ultrahigh resolution in vivo human brain magnetic resonance imaging (MRI) dataset. It consists of T1-weighted whole brain anatomical data acquired at 7 Tesla with a nominal isotropic resolution of 250 μm of a single young healthy Caucasian subject and was recorded using prospective motion correction. The raw data amounts to approximately 1.2 TB and was acquired in eight hours total scan time. The resolution of this dataset is far beyond any previously published in vivo structural whole brain dataset...
March 14, 2017: Scientific Data
https://www.readbyqxmd.com/read/28291210/-long-association-tracts-of-the-human-white-matter-an-analysis-of-18-hemisphere-dissections-and-in-vivo-hardi-csd-tractography
#19
S A Goryainov, A V Kondrashov, M F Gol'dberg, A I Batalov, R A Sufianov, N E Zakharova, I N Pronin, D A Gol'bin, V Yu Zhukov, G F Dobrovol'sky, S Yu Shelyakin, V N Vorob'ev, S S Dadykin, A A Potapov
BACKGROUND: Anatomy of the conduction tracts of the cerebral cortex has been studied for a long time. Invention of diffusion tensor tractography renewed interest in this subject. The objectives of this work were to develop and improve protocols for dissection of the long association tracts of the human brain with studying the features of their segmentation, topography, and variability, compare the obtained data with the MR tractography data, and prepare for further clinical and anatomical studies...
2017: Zhurnal Voprosy Neĭrokhirurgii Imeni N. N. Burdenko
https://www.readbyqxmd.com/read/28288907/in-vivo-quantification-of-amygdala-subnuclei-using-4-7-t-fast-spin-echo-imaging
#20
Arash Aghamohammadi-Sereshki, Yushan Huang, Fraser Olsen, Nikolai V Malykhin
The amygdala (AG) is an almond-shaped heterogeneous structure located in the medial temporal lobe. The majority of previous structural Magnetic Resonance Imaging (MRI) volumetric methods for AG measurement have so far only been able to examine this region as a whole. In order to understand the role of the AG in different neuropsychiatric disorders, it is necessary to understand the functional role of its subnuclei. The main goal of the present study was to develop a reliable volumetric method to delineate major AG subnuclei groups using ultra-high resolution high field MRI...
March 10, 2017: NeuroImage
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