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Deformable Segmentation

Peijun Hu, Yuankai Huo, Dexing Kong, J Jeffrey Carr, Richard G Abramson, Katherine G Hartley, Bennett A Landman
Quantification of fat and muscle on clinically acquired CT scans is critical for determination of body composition, a key component of health. Manual tracing has been regarded as the gold standard method of body segmentation; however, manual tracing is time-consuming. Many semi-automated/automated algorithms have been proposed to avoid the manual efforts. Previous efforts largely focused on segmenting 2D cross-sectional images (e.g., at L3/T4 vertebra locations) rather than on the whole-body volume. In this paper, we propose a fully automated 3D body composition estimation framework for segmenting the muscle and fat from abdominal CT scans...
2018: Computational methods and clinical applications in musculoskeletal imaging: 5th International Workshop, MSKI 2017, held in conjunction with MICCAI 2017, Quebec City, QC, Canada, September 10, 2017, Revised selected papers
Amber T Collins, Micaela L Kulvaranon, Hattie C Cutcliffe, Gangadhar M Utturkar, Wyatt A R Smith, Charles E Spritzer, Farshid Guilak, Louis E DeFrate
BACKGROUND: Obesity is a primary risk factor for the development of knee osteoarthritis (OA). However, there remains a lack of in vivo data on the influence of obesity on knee cartilage mechanics and composition. The purpose of this study was to determine the relationship between obesity and tibiofemoral cartilage properties. METHODS: Magnetic resonance images (3T) of cartilage geometry (double-echo steady-state) and T1rho relaxation of the knee were obtained in healthy subjects with a normal (n = 8) or high (n = 7) body mass index (BMI) before and immediately after treadmill walking...
October 17, 2018: Arthritis Research & Therapy
Jun Sup Kim, Zoe Beatrice Cheung, Varun Arvind, John Caridi, Samuel Kang-Wook Cho
Study Design: Cadaveric biomechanical study. Purpose: The purpose of this study was to biomechanically evaluate the effect of preserving or augmenting the interspinous ligament (ISL) and supraspinous ligament (SSL; ISL/SSL) complex between the upper instrumented vertebra (UIV) and UIV+1 using a cadaveric model. Overview of Literature: Adult spinal deformity is becoming an increasingly prevalent disorder, and proximal junctional kyphosis (PJK) is a well-known postoperative complication following long spinal fusion...
October 18, 2018: Asian Spine Journal
Hongfei Sun, Tao Lin, Kai Xie, Liugang Gao, Jianfeng Sui, Xinye Ni
The purpose of this study is to create a new pseudo-computed tomography (CT) imaging approach under superposed ultrasound (US) deformation fields based on step-by-step local registration. Scanned CT and US 3D image datasets of three patients with postoperative cervical carcinoma were selected, including CT (CTsim) and US images (USsim) acquired during simulated positioning process and cone beam CT (CBCT) and US images for positioning verification (USpv) acquired after treatment for 10 times. Regions of interest such as urinary bladders were segmented out and accepted local registration to obtain different deformation fields...
October 15, 2018: Medical & Biological Engineering & Computing
C-Y Li, C-L Chang, T-W Tai
Impaired functional movement may occur after spinal surgery, which increases risk of fall episode and hip fracture. Patients with long-segment thoracolumbar spine fusions had a significantly higher risk of hip fracture than those with only discectomies. Fall prevention is necessary due to the highly increased hip fracture risk. INTRODUCTION: Spinal surgeries are performed to treat spondylolisthesis, fractures, scoliosis, or other deformities. Impaired balance mechanisms and functional movement may occur after spinal surgery...
October 15, 2018: Osteoporosis International
Bulent Bagci
The nonsurgical treatment of valley-type tear trough (TT) deformity with diffuse depression in preseptal segment aims a more effective and safer treatment alternative to present padding techniques through the use of hyaluronic acid fillers to the preseptal space. 22G 50-mm cannula was inserted into the preseptal space, 2 cm inferolateral to the lateral canthus, and a low concentration of monophasic hyaluronic acid filler was applied. TT deformity was treated through the elimination of the contrasting subcutaneous fat tissue quality and quantity both above and below the TT, which contributes to the accentuation of the TT deformity...
August 2018: Plastic and Reconstructive Surgery. Global Open
Stephen Alex Rottgers, Ingrid Ganske, Isabelle Citron, Mark Proctor, John G Meara
Background: Turricephaly is considered one of the most difficult cranial deformities to correct as addressing cranial height can result in increased intracranial pressure. We describe a new technique of total calvarial remodeling with bony transposition to simultaneously correct turricephaly and brachycephaly while preserving intracranial volume. Methods: A retrospective review of patients undergoing single-stage cranial vault remodeling by a single surgeon (J.G...
August 2018: Plastic and Reconstructive Surgery. Global Open
Myung-Sang Moon, Sang-Jae Kim, Min-Su Kim, Dong-Suk Kim
Study Design: A case study. Purpose: To assess the chronological changes of the disease-related kyphosis after chemotherapy alone, secondly to clarify the role of growth cartilage in the healed lesion on kyphosis change, and to define the accurate prediction time in assessing residual kyphosis. Overview of Literature: None of the previous papers up to now dealt with the residual kyphosis, stability and remodeling processes of the affected segments...
October 16, 2018: Asian Spine Journal
Albert H Vette, Martha Funabashi, Justin Lewicke, Beth Watkins, Matthew Prowse, Graeme Harding, Anelise Silveira, Manu Saraswat, Sukhdeep Dulai
BACKGROUND: Dynamic pedobarography is used to measure the change in plantar pressure distribution during gait. Clinical methods of pedobarographic analysis lack, however, a standardized, functional segmentation or require costly motion capture technology and expertise. Furthermore, while commonly used pedobarographic measures are mostly based on peak pressures, progressive foot deformities also depend on the duration the pressure is applied, which can be quantified via impulse measures...
October 1, 2018: Gait & Posture
R I Kirsanov, V P Kulikov, S N Belitskiĭ, S I Zhestovskaia
Using the method of duplex scanning, we examined a total of 123 patients presenting with a deformity of the subclavian artery (SCA). We assessed the Doppler spectrum of blood flow in the zone of the SCA deformity, as well as in V2 and V4 segments of the ipsilateral vertebral artery (VA) at rest and in breath holding on inspiration. Deformity of the SCA was observed on the right in 91% of cases, on the left in 5%, and on both sides in 4%. Haemodynamic disorders in the ipsilateral VA as a change of the shape of the Doppler spectrum according to the type of steal syndrome were noted in 10...
2018: Angiologii︠a︡ i Sosudistai︠a︡ Khirurgii︠a︡, Angiology and Vascular Surgery
Camila Munoz, Radhouene Neji, Karl P Kunze, Stephan G Nekolla, Rene M Botnar, Claudia Prieto
PURPOSE: To develop a framework for efficient and simultaneous acquisition of motion-compensated whole-heart coronary MR angiography (CMRA) and left ventricular function by MR and myocardial integrity by PET on a 3T PET-MR system. METHODS: An acquisition scheme based on a dual-phase CMRA sequence acquired simultaneously with cardiac PET data has been developed. The framework is integrated with a motion-corrected image reconstruction approach, so that non-rigid respiratory and cardiac deformation fields estimated from MR images are used to correct both the CMRA (respiratory motion correction for each cardiac phase) and the PET data (respiratory and cardiac motion correction)...
October 15, 2018: Magnetic Resonance in Medicine: Official Journal of the Society of Magnetic Resonance in Medicine
Gianluca Di Bella, Scipione Carerj, Antonino Recupero, Rocco Donato, Pietro Pugliatti, Gabriella Falanga, Stefano Pedri, Giampiero Vizzari, Mariapaola Campisi, Concetta Zito, Cesare de Gregorio
BACKGROUND: The aim of present study was to assess left ventricular (LV) myocardial deformation and changes over time in patients with acute myocarditis (AM) with preserved ejection fraction detected by late gadolinium enhancement (LGE) magnetic resonance imaging. METHODS: Thirty-five male patients with AM diagnoses and preserved systolic function based on cardiac magnetic resonance imaging (MRI) were prospectively enrolled. On admission, echocardiography with measurements of global and segmental longitudinal (LS) strains was performed both at the endocardial (ENDO) and epicardial (EPI) levels...
October 12, 2018: Echocardiography
Yong Huang, Ganjun Feng, Limin Liu, Xi Yang, Yueming Song, Chunguang Zhou, Lei Wang, Zhongjie Zhou
The treatment of congenital hemivertebrae in the upper thoracic region is challenging. The objective of this study was to investigate the outcomes of posterior hemivertebral resection for the upper thoracic region. Twenty-one patients diagnosed with upper thoracic congenital scoliosis were included. All of them received hemivertebral resection surgery via the posterior-only approach with at least 2 years of follow-up. The radiographic parameters and Scoliosis Research Society-22 score were analyzed. All the intraoperative and postoperative complications were recorded retrospectively...
October 10, 2018: Journal of Pediatric Orthopedics. Part B
Kate E Elzinga, John R Lien
CASE: A 31-year-old Caucasian man presented with a greater arc perilunate variant injury after falling from a friend's shoulders onto an outstretched hand. Imaging revealed a minimally displaced scaphoid waist fracture and a nondisplaced transverse fracture through a previously unrecognized lunotriquetral coalition. A volar intercalated segmental instability (VISI) deformity was present. Open reduction with osseous fixation (a headless compression screw for the scaphoid waist fracture and 3 Kirschner wires across the midcarpal joint) and repair of the torn volar ligaments partially restored the carpal alignment...
October 10, 2018: Journal of Bone and Joint Surgery. American Volume
Paolo Caravaggi, Chiarella Sforza, Alberto Leardini, Nicola Portinaro, Artemisia Panou
Background: Plano-valgus is a common alteration of the paediatric foot, characterized by valgus hindfoot, foot pronation and drop of the medial longitudinal arch. Despite their importance in the diagnosis and classification of plano-valgus foot condition, little information is available on functional alterations of the major joints spanning the medial longitudinal arch - i.e. midtarsal and tarso-metatarsal. Aim of the study was to provide objective description of the alterations in plano-valgus midfoot joints with respect to those in an age-matched normally-developed feet population...
2018: Journal of Foot and Ankle Research
Yi Sun, Lei Tian, Heinz-Theo Luebbers, Constantinus Politis
Bilateral sagittal split ramus osteotomy (BSSO) surgery is used to correct various dento-skeletal deformities. Clinical outcomes are critically dependent on accurate and proper positioning of skeletal units created by BSSO. Monitoring skeletal changes postoperatively is a major part of follow-up. Between January 2015 and December 2015, 24 patients underwent BSSO surgery without any other segmental osteotomy (mean age, 29.9 ± 14.2 [range, 17-67] years; 18 females). Cephalometric X-rays and cone-beam computed tomography scans were performed 6 weeks and 12 months postoperatively...
September 20, 2018: Journal of Cranio-maxillo-facial Surgery
Mathias Neugebauer, Lennart Tautz, Markus Hüllebrand, Simon Sündermann, Franziska Degener, Leonid Goubergrits, Titus Kühne, Volkmar Falk, Anja Hennemuth
PURPOSE: Various options are available for the treatment of mitral valve insufficiency, including reconstructive approaches such as annulus correction through ring implants. The correct choice of general therapy and implant is relevant for an optimal outcome. Additional to guidelines, decision support systems (DSS) can provide decision aid by means of virtual intervention planning and predictive simulations. Our approach on virtual downsizing is one of the virtual intervention tools that are part of the DSS workflow...
October 6, 2018: International Journal of Computer Assisted Radiology and Surgery
Jakub Godzik, Randy J Hlubek, Bernardo de Andrada Pereira, David S Xu, Corey T Walker, S Harrison Farber, Jay D Turner, Gregory Mundis, Juan S Uribe
BACKGROUND: Traditional open approaches to correct lumbar spine deformities include 3-column osteotomies, such as a pedicle subtraction osteotomy (PSO). Minimally invasive surgical (MIS) techniques have been developed for lateral transpsoas anterior column realignment (ACR). These 2 techniques have not previously been combined. Our objective was to investigate the cadaveric feasibility of a combined hybrid MIS ACR-PSO technique for deformity correction and review early clinical experience...
October 3, 2018: World Neurosurgery
Mete Bakir, Jacob L Meyer, Andre Sutrisno, James Economy, Iwona Jasiuk
Development of porous materials consisting of polymer host matrix enriched with bioactive ceramic particles that can initiate the reproduction of cellular organisms while maintaining in vivo mechanical reliability is a long-standing challenge for synthetic bone substitutes. We present hydroxyapatite (HA) reinforced aromatic thermosetting copolyester (ATSP) matrix bionanocomposite as a potential reconfigurable bone replacement material. The nanocomposite is fabricated by solid-state mixing a matching set of precursor oligomers with biocompatible pristine HA particles...
October 5, 2018: Scientific Reports
Xin Huang, Yan Yue, Yinmeng Wang, Yujiao Deng, Lu Liu, Yanqi Di, Shasha Sun, Deyou Chen, Li Fan, Jian Cao
BACKGROUND: Conventional echocardiography is not sensitive enough to assess left ventricular (LV) dysfunction in hypertrophic cardiomyopathy (HCM) patients. This research attempts to find a new ultrasonic technology to better assess LV diastolic function, systolic function, and myocardial longitudinal and circumferential systolic strain of segments with different thicknesses in HCM patients. METHODS: This study included 50 patients with HCM and 40 healthy subjects as controls...
October 2, 2018: Cardiovascular Ultrasound
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