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Anatomical segmentation

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https://www.readbyqxmd.com/read/29350537/cartilage-morphological-and-histological-findings-after-reconstruction-of-the-glenoid-with-an-iliac-crest-bone-graft
#1
Alexander Auffarth, Herbert Resch, Nicholas Matis, Martin Hudelmaier, Wolfgang Wirth, Rosemarie Forstner, Daniel Neureiter, Andreas Traweger, Philipp Moroder
BACKGROUND: The J-bone graft is presumably representative of iliac crest bone grafts in general and allows anatomic glenoid reconstruction in cases of bone defects due to recurrent traumatic anterior shoulder dislocations. As a side effect, these grafts have been observed to be covered by some soft, cartilage-like tissue when arthroscopy has been indicated after such procedures. PURPOSE: To evaluate the soft tissue covering of J-bone grafts by use of magnetic resonance imaging (MRI) and histological analysis...
January 1, 2018: American Journal of Sports Medicine
https://www.readbyqxmd.com/read/29350087/segmentation-of-tongue-shapes-during-vowel-production-in-magnetic-resonance-images-based-on-statistical-modelling
#2
Jessica C Delmoral, Sandra M Rua Ventura, João Manuel Rs Tavares
Quantification of the anatomic and functional aspects of the tongue is pertinent to analyse the mechanisms involved in speech production. Speech requires dynamic and complex articulation of the vocal tract organs, and the tongue is one of the main articulators during speech production. Magnetic resonance imaging has been widely used in speech-related studies. Moreover, the segmentation of such images of speech organs is required to extract reliable statistical data. However, standard solutions to analyse a large set of articulatory images have not yet been established...
January 1, 2018: Proceedings of the Institution of Mechanical Engineers. Part H, Journal of Engineering in Medicine
https://www.readbyqxmd.com/read/29350003/-anatomical-feature-of-lumbar-and-s%C3%A2-pedicle-in-patients-with-thoracolumbar-kyphosis-secondary-to-ankylosing-spondylitis
#3
Zong-Xian Feng, Bang-Ping Qian, Sai-Hu Mao, Yong Qiu
OBJECTIVE: To measure the correlative parameters of vertebral pedicles from L₁ to S₁ by CT scan in the patients with thoracolumbar kyphosis secondary to ankylosing spondylitis(AS) and disc degenerative disease(DDD), and analyze their anatomical difference in order to provide the selection and placement of pedicle screw during operation. METHODS: The clinical data of 30 male AS patients (AS group) with the mean age of(35.7±9.5) years (ranged, 23 to 51) and 30 male DDD patients (DDD group) with the mean age of(52...
February 25, 2017: Zhongguo Gu Shang, China Journal of Orthopaedics and Traumatology
https://www.readbyqxmd.com/read/29349382/intravascular-ultrasound-as-a-novel-tool-for-the-diagnosis-and-targeted-treatment-of-functional-popliteal-artery-entrapment-syndrome
#4
Anna E Boniakowski, Frank Davis, Dani Campbell, Minhajuddin Khaja, Katherine A Gallagher
Functional popliteal artery entrapment syndrome can be difficult to diagnose, as the imaging modalities presently employed are designed to detect anatomic entrapment. We describe a novel imaging technique to aid in diagnosis in this cohort. A 22-year-old cyclist presented with exercise-limiting claudication. Magnetic resonance angiography with provocative maneuvers was nondiagnostic. Digital subtraction angiography revealed long-segment occlusion of the popliteal artery with plantar flexion; however, the specific site of compression remained unclear...
June 2017: Journal of Vascular Surgery Cases and Innovative Techniques
https://www.readbyqxmd.com/read/29347992/anatomical-relation-between-s1-sacroiliac-screws-entrance-points-and-superior-gluteal-artery
#5
Yong Zhao, Libo You, Wei Lian, Dexin Zou, Shengjie Dong, Tao Sun, Shudong Zhang, Dan Wang, Jingning Li, Wenliang Li, Yuchi Zhao
BACKGROUND: To conduct radiologic anatomical study on the relation between S1 sacroiliac screws' entry points and the route of the pelvic outer superior gluteal artery branches with the aim to provide the anatomical basis and technical reference for the avoidance of damage to the superior gluteal artery during the horizontal sacroiliac screw placement. METHODS: Superior gluteal artery CTA (CT angiography) vascular imaging of 74 healthy adults (37 women and 37 men) was done with 128-slice spiral CT (computed tomography)...
January 18, 2018: Journal of Orthopaedic Surgery and Research
https://www.readbyqxmd.com/read/29346781/laparoscopic-nephron-sparing-calycectomy-for-treating-fraley-s-syndrome
#6
Francesco Porpiglia, Riccardo Bertolo, Enrico Checcucci, Daniele Amparore, Matteo Manfredi, Cristian Fiori
Background/Aims/Objectives: Various nephron-sparing approaches were described as part of surgical management for Fraley's syndrome, a rare anatomic variant of the renal vascular anatomy that compresses the upper pole infundibulum resulting in an upper calyceal obstruction and dilatation, with symptoms of flank pain and hematuria. To date, descriptions of minimally invasive correction techniques are anecdotal. METHODS: A retroperitoneal pure laparoscopic approach using the nephron-sparing technique was chosen in the presented case...
January 18, 2018: Urologia Internationalis
https://www.readbyqxmd.com/read/29346229/anatomical-variations-of-the-vertebral-artery-in-the-upper-cervical-spine-clinical-relevance-for-procedures-targeting-the-c1-c2-and-c2-c3-joints
#7
Maria Francisca Elgueta, Johanna Ortiz Jimenez, Nina Nan Wang, Almudena Pérez Lara, Jeffrey Chankowsky, Roshanak Charghi, De Q Tran, Roderick J Finlayson
BACKGROUND AND OBJECTIVES: Accidental breach of the vertebral artery (VA) during the performance of cervical pain blocks can result in significant morbidity. Whereas anatomical variations have been described for the foraminal (V2) segment of the VA, those involving its V3 portion (between the C2 transverse process and dura) have not been investigated and may be of importance for procedures targeting the third occipital nerve or the lateral atlantoaxial joint. METHODS: Five hundred computed tomography angiograms of the neck performed in patients older than 50 years for the management of cerebrovascular accident or cervical trauma (between January 2010 and May 2016) were retrospectively and independently reviewed by 2 neuroradiologists...
January 16, 2018: Regional Anesthesia and Pain Medicine
https://www.readbyqxmd.com/read/29341344/the-medial-temporal-lobe-functional-connectivity-patterns-associated-with-forming-different-mental-representations
#8
Signy Sheldon, Brian Levine
The medial temporal lobes (MTL), and more specifically the hippocampus, are critical for forming mental representations of past experiences - autobiographical memories - and for forming other 'non-experienced' types of mental representations, such as imagined scenarios. How the MTL coordinate with other brain areas to create these different types of representations is not well understood. To address this issue, we performed a task-based functional connectivity analysis on a previously published dataset in which fMRI data were collected as participants created different types of mental representations under three conditions...
January 17, 2018: Hippocampus
https://www.readbyqxmd.com/read/29338984/practical-guidelines-for-performing-laparoscopic-liver-resection-based-on-the-second-international-laparoscopic-liver-consensus-conference
#9
REVIEW
Jai Young Cho, Ho-Seong Han, Go Wakabayashi, Olivier Soubrane, David Geller, Nicholas O'Rourke, Joseph Buell, Daniel Cherqui
Laparoscopic liver resection is rapidly increasing, and certain types of resection are considered standard procedures for liver resection, especially for small malignant tumors located on the liver surface or in the anterolateral segments of the liver. Several specialized centers have performed many types of highly complex hepatectomies, anatomical resections, and laparoscopic donor hepatectomies. Even though several international consensus conferences and expert meetings have been held, until now there have been no practical guidelines for beginners or experts conducting laparoscopic liver resection...
January 6, 2018: Surgical Oncology
https://www.readbyqxmd.com/read/29335777/fully-automatic-ct-histogram-based-fat-estimation-in-dead-bodies
#10
Michael Hubig, Sebastian Schenkl, Holger Muggenthaler, Felix Güttler, Andreas Heinrich, Ulf Teichgräber, Gita Mall
Post-mortem body cooling is the foundation of temperature-based death time estimations (TDE) in homicide cases. Forensic science generally provides two types of p.m. body cooling models, the phenomenological and the physical models. Since both of them have to implement important individual parameters like the quantity of abdominal fat explicitly or implicitly, a more exact quantification and localization of abdominal fat is a desideratum in TDE. Particularly for the physical models, a better knowledge of the abdominal fat distribution could lead to relevant improvements in TDEs...
January 15, 2018: International Journal of Legal Medicine
https://www.readbyqxmd.com/read/29331847/longitudinal-hippocampal-and-extra-hippocampal-microstructural-and-macrostructural-changes-following-temporal-lobe-epilepsy-surgery
#11
Cameron A Elliott, Donald W Gross, B Matt Wheatley, Christian Beaulieu, Tejas Sankar
OBJECTIVES: 1) Characterize the evolution of microstructural changes in the contralateral, non-operated hippocampus-using longitudinal diffusion tensor imaging (DTI)-following surgery for temporal lobe epilepsy (TLE). 2) Characterize the downstream extra-hippocampal volumetric changes of the fornix and mammillary bodies after TLE surgery. 3) Examine the relationship between these measures and seizure/cognitive outcome. METHODS: Serial structural and DTI brain MRI scans were collected in 25 TLE patients pre- and post-surgery (anterior temporal lobectomy, ATL - 13; selective amygdalohippocampectomy, SelAH - 12) and in 12 healthy controls...
January 6, 2018: Epilepsy Research
https://www.readbyqxmd.com/read/29331208/wrist-a-wrist-image-segmentation-toolkit-for-carpal-bone-delineation-from-mri
#12
Brent Foster, Anand A Joshi, Marissa Borgese, Yasser Abdelhafez, Robert D Boutin, Abhijit J Chaudhari
Segmentation of the carpal bones from 3D imaging modalities, such as magnetic resonance imaging (MRI), is commonly performed for in vivo analysis of wrist morphology, kinematics, and biomechanics. This crucial task is typically carried out manually and is labor intensive, time consuming, subject to high inter- and intra-observer variability, and may result in topologically incorrect surfaces. We present a method, WRist Image Segmentation Toolkit (WRIST), for 3D semi-automated, rapid segmentation of the carpal bones of the wrist from MRI...
December 28, 2017: Computerized Medical Imaging and Graphics: the Official Journal of the Computerized Medical Imaging Society
https://www.readbyqxmd.com/read/29327560/-research-progress-on-reatment-of-unstable-atlas-fracture-with-single-segment-fixation-by-transoral-approach
#13
REVIEW
Li-Ran Wang, Liu-Jun Zhao, Wei-Hu Ma
As a common type of fracture in cervical, atlas fracture is frequently unstable due to its special anatomical structure. In a previous treatment, external fixation was likely to bring low bony union rate and long-term neck pain, while occipito-cervical fusion and atlantoaxial fusion sacrifice range of motion in cervical spine. Reduction and single section fixation of atlas by anterior lateral mass screws through the transoral approach were reported by some scholars, and the retrospective study demonstrated the high healing rate, reservation of cervical ROM and less bleeding...
January 25, 2017: Zhongguo Gu Shang, China Journal of Orthopaedics and Traumatology
https://www.readbyqxmd.com/read/29325963/surgical-anatomy-of-the-eustachian-tube-for-endoscopic-transnasal-skull-base-surgery-a-cadaveric-and-radiological-study
#14
Noritaka Komune, Satoshi Matsuo, Koichi Miki, Yojiro Akagi, Ryota Kurogi, Koji Iihara, Takashi Nakagawa
OBJECTIVE: The endoscopic endonasal approach to the anatomically complex lateral skull base presents technical challenges. The use of the Eustachian tube as a landmark to identify the petrous internal carotid artery has recently been reported, and this study aims to define the anatomical relationship between the Eustachian tube and its surrounding structures using cadaveric dissection and radiologic analysis. METHODS: To clarify the relationship of the Eustachian tube with its surrounding structures, we performed endoscopic and microscopic dissection of four adult cadaveric heads, and analyzed computed topography scans from 20 patients...
January 8, 2018: World Neurosurgery
https://www.readbyqxmd.com/read/29325780/longitudinal-atlas-for-normative-human-brain-development-and-aging-over-the-lifespan-using-quantitative-susceptibility-mapping
#15
Yuyao Zhang, Hongjiang Wei, Matthew J Cronin, Naying He, Fuhua Yan, Chunlei Liu
Longitudinal brain atlases play an important role in the study of human brain development and cognition. Existing atlases are mainly based on anatomical features derived from T1-and T2-weighted MRI. A 4D developmental quantitative susceptibility mapping (QSM) atlas may facilitate the estimation of age-related iron changes in deep gray matter nuclei and myelin changes in white matter. To this end, group-wise co-registered QSM templates were generated over various age intervals from age 1-83 years old. Registration was achieved by combining both T1-weighted and QSM images...
January 8, 2018: NeuroImage
https://www.readbyqxmd.com/read/29325356/-the-role-and-significance-of-digital-reconstruction-technique-in-liver-segments-based-on-portal-vein-structure
#16
X J Zhou, Q Dong, C Z Zhu, X Chen, B Wei, Y H Duan, J Zhao, X W Hao, H Zhang, P Nie, B Hu, W J Xu, R W Shen, Z H Chen, K R Dong, Y Z Bai, Q Shu, W J Luo, F Gao, N Xia, Q Y Yu
Objective: To study the segment of liver according to the large amount of three-dimensional(3D) reconstructive images of normal human livers and the vascular system, and to recognize the basic functional liver unit based on the anatomic features of the intrahepatic portal veins. Methods: The enhanced CT primitive DICOM files of 1 260 normal human livers from different age groups who treated from October 2013 to February 2017 provided by 16 hospitals were analyzed using the computer-aided surgery system.The 3D liver and liver vascular system were reconstructed, and the digital liver 3D model was established...
January 1, 2018: Zhonghua Wai Ke za Zhi [Chinese Journal of Surgery]
https://www.readbyqxmd.com/read/29324931/vitrectomy-with-fibrovascular-membrane-delamination-for-proliferative-diabetic-retinopathy-with-or-without-preoperative-avastin
#17
M Vasalaki, E Papavasileiou, C Garnavou-Xirou, S Velissaris, V Zygoura, D McHugh, T L Jackson
OBJECTIVE: To describe and compare 1. The changes in intraretinal microstructure using serial spectral domain optical coherence tomography (SD-OCT) preceding and following pars plana vitrectomy and delamination of fibrovascular membranes and 2. Intraoperative and postoperative complications in patients with proliferative diabetic retinopathy (PDR) who had preoperative Avastin (group A) or not (group B). SUBJECTS AND METHOD: This retrospective, interventional case series includes 113 eyes...
September 2017: Hellenic Journal of Nuclear Medicine
https://www.readbyqxmd.com/read/29322238/development-of-inhibitory-synaptic-inputs-on-layer-2-3-pyramidal-neurons-in-the-rat-medial-prefrontal-cortex
#18
Mari A Virtanen, Claudia Marvine Lacoh, Hubert Fiumelli, Markus Kosel, Shiva Tyagarajan, Mathias de Roo, Laszlo Vutskits
Inhibitory control of pyramidal neurons plays a major role in governing the excitability in the brain. While spatial mapping of inhibitory inputs onto pyramidal neurons would provide important structural data on neuronal signaling, studying their distribution at the single cell level is difficult due to the lack of easily identifiable anatomical proxies. Here, we describe an approach where in utero electroporation of a plasmid encoding for fluorescently tagged gephyrin into the precursors of pyramidal cells along with ionotophoretic injection of Lucifer Yellow can reliably and specifically detect GABAergic synapses on the dendritic arbour of single pyramidal neurons...
January 10, 2018: Brain Structure & Function
https://www.readbyqxmd.com/read/29320322/multidetector-ct-of-midfacial-fractures-classification-systems-principles-of-reduction-and-common-complications
#19
David Dreizin, Arthur J Nam, Silviu C Diaconu, Mark P Bernstein, Uttam K Bodanapally, Felipe Munera
The advent of titanium hardware, which provides firm three-dimensional positional control, and the exquisite bone detail afforded by multidetector computed tomography (CT) have spurred the evolution of subunit-specific midfacial fracture management principles. The structural, diagnostic, and therapeutic complexity of the individual midfacial subunits, including the nose, the naso-orbito-ethmoidal region, the internal orbits, the zygomaticomaxillary complex, and the maxillary occlusion-bearing segment, are not adequately reflected in the Le Fort classification system, which provides only a general framework and has become less relevant in contemporary practice...
January 2018: Radiographics: a Review Publication of the Radiological Society of North America, Inc
https://www.readbyqxmd.com/read/29315701/histological-and-quantitative-analyzes-of-the-stromal-and-acinar-components-of-normal-human-prostate-zones
#20
Edilaine F Alves, Bruno Leonardo M de Freitas Ribeiro, Waldemar S Costa, Carla B M Gallo, Francisco J B Sampaio
BACKGROUND: McNeal divided the human prostate into three major anatomical areas: the peripheral zone (PZ), the central zone (CZ), and the transition zone (TZ). Each of these areas is biologically and histologically distinct. The PZ and TZ have clinical significance and are associated with prostate cancer (PC) and benign prostatic hyperplasia (BPH), respectively. Therefore, the objective of the present study was to quantitatively and qualitatively analyze the parenchymal and stromal components that constitute the different prostate zones...
January 8, 2018: Prostate
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