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Deformable Segmentation

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https://www.readbyqxmd.com/read/30101504/integrated-functional-high-strength-hydrogels-with-metal-coordination-complexes-and-h-bonding-dual-physically-cross-linked-networks
#1
Xuefeng Li, Rongzhe Li, Zuifang Liu, Xiang Gao, Shijun Long, Gaowen Zhang
With the deepening of research on high-strength hydrogels, the multi-functional study of hydrogels has become a hot spot. In this paper, a dual cross-linked physical high-strength hydrogels is prepared by a relatively simple method. 2-Vinyl- 4,6-Diamino-2-vinyl-1,3,5-triazine (VDT) induces the formation of the first cross-linking points through the interaction of hydrogen bonds with poly(acrylamide-co-acrylic acid) (PAm-co-Ac) chains, then the secondary physical cross-linkers Fe3+ that introduce ionic coordinates between Fe3+ and -COO- groups...
August 12, 2018: Macromolecular Rapid Communications
https://www.readbyqxmd.com/read/30099221/three-dimensional-pharyngeal-airway-changes-in-dento-skeletal-class-ii-patients-after-two-jaw-orthognathic-surgery-with-segmentation-a-pilot-study
#2
Su Keng Tan, Alexander Th Tang, Dr Odont, Wai Keung Leung, Roger A Zwahlen
PURPOSE: To investigate short- and long-term post-surgical three-dimensional changes of pharyngeal airway morphology and hyoid bone position in dento-skeletal class II deformity patients after two-jaw surgery with segmentation. METHODS: Relations between skeletal movement, hyoid bone position and three-dimensional pharyngeal airway changes were retrospectively analyzed on pre- and post-surgical CBCTs in dento-skeletal class II patients who underwent orthognathic two-jaw surgery with segmentation...
August 9, 2018: Journal of Stomatology, Oral and Maxillofacial Surgery
https://www.readbyqxmd.com/read/30096870/myocardial-contraction-during-the-diastolic-isovolumetric-period-analysis-of-longitudinal-strain-by-means-of-speckle-tracking-echocardiography
#3
Vicente Mora, Ildefonso Roldán, Elena Romero, Assumpció Saurí, Diana Romero, Jana Pérez-Gozalbo, Natalia Ugalde, Javier Bertolín, Melisa Rodriguez-Israel, Carmen Pérez-Olivares Delgado, Jorge A Lowenstein
BACKGROUND: According to the ventricular myocardial band model, the diastolic isovolumetric period is a contraction phenomenon. Our objective was to employ speckle-tracking echocardiography (STE) to analyze myocardial deformation of the left ventricle (LV) and to confirm if it supports the myocardial band model. METHODS: This was a prospective observational study in which 90 healthy volunteers were recruited. We evaluated different types of postsystolic shortening (PSS) from an LV longitudinal strain study...
August 9, 2018: Journal of Cardiovascular Development and Disease
https://www.readbyqxmd.com/read/30094849/evaluation-of-the-effects-of-initial-water-temperature-and-curing-time-on-fiberglass-cast-strength
#4
Marcos Pérez-Nogués, Julie E Dechant, Tanya Garcia-Nolen, Susan M Stover
OBJECTIVE: To determine the effects of water temperature and cure time on cast strength. STUDY DESIGN: Prospective randomized experimental study. METHODS: Two water temperatures were tested, 23°C (cold) and 42°C (warm). Cast constructs were made of 4-inch fiberglass casting material over a rubber mandrel. Each construct was divided into 3 segments and tested in 4-point bending at 0.5, 1, and 24 hours. Stiffness and bending moment, cumulative energy, and angular deformation at yield and failure were recorded and analyzed by using repeated measures ANOVA...
August 9, 2018: Veterinary Surgery: VS
https://www.readbyqxmd.com/read/30094779/preoperative-liver-registration-for-augmented-monocular-laparoscopy-using-backward-forward-biomechanical-simulation
#5
Erol Özgür, Bongjin Koo, Bertrand Le Roy, Emmanuel Buc, Adrien Bartoli
PURPOSE: Augmented reality for monocular laparoscopy from a preoperative volume such as CT is achieved in two steps. The first step is to segment the organ in the preoperative volume and reconstruct its 3D model. The second step is to register the preoperative 3D model to an initial intraoperative laparoscopy image. To date, there does not exist an automatic initial registration method to solve the second step for the liver in the de facto operating room conditions of monocular laparoscopy...
August 9, 2018: International Journal of Computer Assisted Radiology and Surgery
https://www.readbyqxmd.com/read/30092217/accuracy-of-virtual-surgical-planning-in-treatment-of-temporomandibular-joint-ankylosis-using-distraction-osteogenesis-comparison-of-planned-and-actual-results
#6
Kan Chen, Di Xiao, Bassam Abotaleb, Haozhe Chen, Yunfeng Li, Songsong Zhu
PURPOSE: This study evaluated the accuracy of virtual surgical planning and 3-dimensional (3D) printed templates to guide osteotomy and distraction osteogenesis (DO) in the treatment of temporomandibular joint (TMJ) ankylosis and secondary mandibular deformity. PATIENTS AND METHODS: Seven consecutive patients diagnosed with TMJ ankylosis and mandibular deformities were included. A composite skull model was obtained with data from spiral computed tomography (CT) and laser scanning of the dental arch...
August 6, 2018: Journal of Oral and Maxillofacial Surgery
https://www.readbyqxmd.com/read/30079050/global-hippocampal-volume-reductions-and-local-ca1-shape-deformations-in-amyotrophic-lateral-sclerosis
#7
Judith Machts, Stefan Vielhaber, Katja Kollewe, Susanne Petri, Joern Kaufmann, Mircea Ariel Schoenfeld
There is increasing evidence for hippocampal involvement in Amyotrophic Lateral Sclerosis (ALS). Recent neuroimaging studies have been focused on disease-related hippocampal volume alterations while changes in hippocampal shape have been investigated less frequently. Here, we aimed to characterize the patterns of hippocampal degeneration using both an automatic and manual volumetric and surface-based approach in a group of 31 patients with ALS and 29 healthy controls. Irrespective of the segmentation type, left, and right hippocampal volumes were significantly reduced in ALS compared to controls...
2018: Frontiers in Neurology
https://www.readbyqxmd.com/read/30078055/a-comprehensive-review-of-the-diagnosis-and-management-of-congenital-scoliosis
#8
REVIEW
Charles E Mackel, Ajit Jada, Amer F Samdani, James H Stephen, James T Bennett, Ali A Baaj, Steven W Hwang
PURPOSE: To provide the reader with a comprehensive but concise understanding of congenital scoliosis METHODS: We have undertaken to summarize available literature on the pathophysiology, epidemiology, and management of congenital scoliosis. RESULTS: Congenital scoliosis represents 10% of pediatric spine deformity and is a developmental error in segmentation, formation, or a combination of both leading to curvature of the spine. Treatment options are complicated by balancing growth potential with curve severity...
August 4, 2018: Child's Nervous System: ChNS: Official Journal of the International Society for Pediatric Neurosurgery
https://www.readbyqxmd.com/read/30077025/outcomes-following-single-stage-posterior-vertebral-column-resection-for-severe-thoracic-kyphosis
#9
Cecilia L Dalle Ore, Christopher P Ames, Vedat Deviren, Darryl Lau
INTRODUCTION: Thoracic kyphosis can result in neurologic deficits, pain, and cardiopulmonary dysfunction. Vertebral column resection (VCR) is a powerful technique that can be employed for large curves and fixed deformities. This study reports the outcomes of posterior VCR for adult spinal deformity (ASD) with severe thoracic kyphosis. METHODS: Retrospective review of all ASD patients who underwent posterior VCR for severe thoracic kyphosis (defined as segmental kyphosis greater than 80 degrees) was performed...
August 1, 2018: World Neurosurgery
https://www.readbyqxmd.com/read/30073613/nonlinear-model-of-human-descending-thoracic-aortic-segments-with-residual-stresses
#10
Ivan Breslavsky, Marco Amabili
The nonlinear static deformation of human descending thoracic aortic segments is investigated. The aorta segments are modeled as straight axisymmetric circular cylindrical shells with three hyperelastic anisotropic layers and residual stresses by using an advanced nonlinear shell theory with higher-order thickness deformation not available in commercial finite element codes. The residual stresses are evaluated in the closed configuration in an original way making use of the multiplicative decomposition. The model was initially validated through comparison with published numerical and experimental data for artery and aorta segments...
August 2, 2018: Biomechanics and Modeling in Mechanobiology
https://www.readbyqxmd.com/read/30072821/neural-network-fusion-a-novel-ct-mr-aortic-aneurysm-image-segmentation-method
#11
Duo Wang, Rui Zhang, Jin Zhu, Zhongzhao Teng, Yuan Huang, Filippo Spiga, Michael Hong-Fei Du, Jonathan H Gillard, Qingsheng Lu, Pietro Liò
Medical imaging examination on patients usually involves more than one imaging modalities, such as Computed Tomography (CT), Magnetic Resonance (MR) and Positron Emission Tomography(PET) imaging. Multimodal imaging allows examiners to benefit from the advantage of each modalities. For example, for Abdominal Aortic Aneurysm, CT imaging shows calcium deposits in the aorta clearly while MR imaging distinguishes thrombus and soft tissues better.1 Analysing and segmenting both CT and MR images to combine the results will greatly help radiologists and doctors to treat the disease...
March 2, 2018: Proceedings of SPIE
https://www.readbyqxmd.com/read/30066340/deformable-mapping-technique-to-correlate-lesions-in-digital-breast-tomosynthesis-and-automated-breast-ultrasound-images
#12
Crystal A Green, Mitchell M Goodsitt, Kristy K Brock, Cynthia L Davis, Eric D Larson, Jasmine H Lau, Paul L Carson
PURPOSE: To develop a deformable mapping technique to match corresponding lesions between digital breast tomosynthesis (DBT) and automated breast ultrasound (ABUS) images. METHODS: External fiducial markers were attached to the surface of two CIRS multi-modality compressible breast phantoms (A and B) containing multiple simulated lesions. Both phantoms were imaged with DBT (upright positioning with cranial-caudal compression) and ABUS (supine positioning with anterior-to-chest wall compression)...
July 31, 2018: Medical Physics
https://www.readbyqxmd.com/read/30064890/modic-changes-and-disc-degeneration-in-adolescent-idiopathic-scoliosis-patients-who-reach-middle-age-without-surgery-can-residual-deformity-cause-lumbar-spine-degeneration
#13
Tsutomu Akazawa, Kota Watanabe, Morio Matsumoto, Taichi Tsuji, Noriaki Kawakami, Toshiaki Kotani, Tsuyoshi Sakuma, Takuya Yamamoto, Satoru Demura, Sumihisa Orita, Kazuki Fujimoto, Yasuhiro Shiga, Hisateru Niki
BACKGROUND: We have yet to determine what types of lumbar degenerative changes can be observed on MRI in middle-aged adolescent idiopathic scoliosis (AIS) patients without undergoing surgery. The aims of this study were to investigate AIS patients who have reached middle age without undergoing surgery and to clarify if residual spinal deformities may have affected health-related quality of life (HRQOL) and lumbar spine degeneration. METHODS: Subjects comprised AIS patients who reached middle age without surgery and who underwent whole-spine X-rays, lumbar MRI, and SRS-22 surveys...
July 28, 2018: Journal of Orthopaedic Science: Official Journal of the Japanese Orthopaedic Association
https://www.readbyqxmd.com/read/30062538/the-value-of-speckle-tracking-echocardiography-in-identifying-right-heart-dysfunction-in-patients-with-chronic-thromboembolic-pulmonary-hypertension
#14
Ai-Li Li, Zhen-Guo Zhai, Ya-Nan Zhai, Wan-Mu Xie, Jun Wan, Xin-Cao Tao
Right ventricular (RV) function is a significantly important factor in the determination of the prognosis of chronic thromboembolic pulmonary hypertension (CTEPH) patients. Speckle-tracking echocardiography (STE) is an angle-independent new technique for quantifying myocardial deformation that is capable of providing data on multiple parameters including longitudinal and transverse information of the myocardium. In the present study, we aimed to study the advantages of STE-derived parameters in identifying RV dysfunction in CTEPH patients...
July 30, 2018: International Journal of Cardiovascular Imaging
https://www.readbyqxmd.com/read/30059336/a-computer-modeling-study-to-assess-the-durability-of-prophylactic-dressings-subjected-to-moisture-in-biomechanical-pressure-injury-prevention
#15
Dafna Schwartz, Ayelet Levy, Amit Gefen
The sacral area is the most common site for pressure injuries (PIs) associated with prolonged supine bedrest. In previous studies, an anisotropic multilayer prophylactic dressing was found to reduce the incidence of PIs and redistribute pressure. The purpose of the current study was to further investigate relationships between design features and biomechanical efficacy of sacral prophylactic dressings. Using computer modeling, the anisotropic multilayer dressing and a hypothetical dressing with different mechanical properties were tested under dry and 3 levels of moist/wet conditions...
July 2018: Ostomy/wound Management
https://www.readbyqxmd.com/read/30058480/effects-on-aortoiliac-fluid-dynamics-after-endovascular-sealing-of-abdominal-aneurysms
#16
Mariano E Casciaro, Javier Dottori, Salma El-Batti, Jean-Marc Alsac, Elie Mousseaux, Ignacio Larrabide, Damian Craiem
OBJECTIVES: To evaluate the effects on aortoiliac fluid dynamics after the implantation of an endograft based on endovascular aneurysm sealing (EVAS) versus endovascular aneurysm repair (EVAR) strategy. METHODS: An adaptive geometrical deformable model was used for aortic lumen segmentation in 8 patients before and after the surgery. Abdominal aneurysms were treated with an endograft based on the EVAS system (Nellix, n = 4) and with a device based on an anatomical fixation technology (n = 4)...
July 29, 2018: Vascular and Endovascular Surgery
https://www.readbyqxmd.com/read/30057219/arthroscopic-distal-scaphoid-resection-for-isolated-scaphotrapeziotrapezoid-osteoarthritis
#17
Akio Iida, Shohei Omokawa, Kenji Kawamura, Takamasa Shimizu, Tadanobu Onishi, Yasuhito Tanaka
PURPOSE: To investigate the radiographic and clinical results of arthroscopic distal scaphoid resection for isolated scaphotrapeziotrapezoid (STT) osteoarthritis and analyze the radiographic parameters associated with the functional outcomes. METHODS: From 2008 to 2014, 17 wrists with symptomatic isolated STT osteoarthritis without carpal deformity underwent arthroscopic distal scaphoid resection. We evaluated visual analog scale (VAS) scores for pain, grip strength, pinch strength, and Patient-Rated Wrist Evaluation (PRWE) scores before surgery and at the final follow-up...
July 26, 2018: Journal of Hand Surgery
https://www.readbyqxmd.com/read/30054806/control-of-metopic-emissary-veins-in-trigonocephaly-surgery-technical-note
#18
Federico di Rocco, Arnaud Gleizal, Laura Lohkamp, Alexandru Szathmari, Christian Paulus, Carmine Mottolese
INTRODUCTION: Trigonocephaly with its premature fusion of the metopic synostosis is associated with a risk of cerebral compression and several craniofacial morphological deformations. Numerous surgical techniques have been proposed to enlarge and reshape the forehead. They all carry a risk of bleeding during osteotomies, especially in the region of the superior sagittal sinus (SSS) encased in the early fused suture and of the paired metopic transosseous emissary veins superior to the glabella, which is typical of this type of synostosis...
July 27, 2018: Child's Nervous System: ChNS: Official Journal of the International Society for Pediatric Neurosurgery
https://www.readbyqxmd.com/read/30052261/bipolar-injury-of-the-clavicle
#19
Ki Won Lee, Joo-Yul Bae, Dong-Kyo Seo, Jung-Ki Ha, Ho Jong Ra, Joon Hee Kim, Byeong Cheol Ho
Eleven patients with bipolar clavicle injuries, including dislocation of both ends of the clavicle, dislocation of the sternoclavicular joint with distal clavicle fracture, dislocation of the acromioclavicular joint with medial clavicle fracture, and segmental fracture of the clavicle, were retrospectively reviewed. The purpose of this study was to report the clinical outcomes and a literature review of bipolar clavicle injury. Nonoperative treatment was performed for 5 patients and surgical treatment for 6 patients...
July 27, 2018: Orthopedics
https://www.readbyqxmd.com/read/30052148/are-the-sagittal-cervical-radiographic-modifiers-of-the-ames-issg-classification-specific-to-adult-cervical-deformity
#20
Ziad Bakouny, Nour Khalil, Joeffroy Otayek, Aren Joe Bizdikian, Fares Yared, Michel Salameh, Naji Bou Zeid, Ismat Ghanem, Khalil Kharrat, Gaby Kreichati, Renaud Lafage, Virginie Lafage, Ayman Assi
OBJECTIVE The Ames-International Spine Study Group (ISSG) classification has recently been proposed as a tool for adult cervical deformity evaluation. This classification includes three radiographic cervical sagittal modifiers that have not been evaluated in asymptomatic adults. The aim of this study was to determine whether the sagittal radiographic modifiers described in the Ames-ISSG cervical classification are encountered in asymptomatic adults without alteration of health-related quality of life (HRQOL)...
July 27, 2018: Journal of Neurosurgery. Spine
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