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3D Anatomy

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https://www.readbyqxmd.com/read/28935463/image-guidance-for-transcatheter-aortic-valve-implantation-tavi-and-cerebral-embolic-protection
#1
I Vernikouskaya, W Rottbauer, B Gonska, C Rodewald, J Seeger, V Rasche, J Wöhrle
The study was aimed at evaluation of the feasibility and potential benefit of image fusion (IF) of pre-procedural CT angiography (CTA) and x-ray (XR) fluoroscopy for image-guided navigation in transfemoral transcatheter aortic valve implantation (TAVI) with the strong focus on guiding the double-filter cerebral embolic protection device and valve prosthesis placement. METHODS: In 31 patients undergoing TAVI, image registration of CTA-derived 3D anatomical models of the relevant cardiac anatomy and vasculature, and live XR was performed applying a commercially available navigation tool...
September 19, 2017: International Journal of Cardiology
https://www.readbyqxmd.com/read/28917553/absence-of-rotational-activity-detected-using-two-dimensional-phase-mapping-in-corresponding-three-dimensional-phase-maps-in-human-persistent-atrial-fibrillation
#2
Bhupesh Pathik, Jonathan M Kalman, Tomos Walters, Pawel Kuklik, Jichao Zhao, Andrew Madry, Prashanthan Sanders, Peter M Kistler, Geoffrey Lee
BACKGROUND: Current phase mapping systems for atrial fibrillation(AF) create two-dimensional(2D) maps. This process may affect the accurate detection of rotors. We developed a three-dimensional(3D) phase mapping technique that utilizes the 3D locations of basket electrodes to project phase onto patient-specific left atrial(LA) 3D surface anatomy. OBJECTIVES: We sought to determine whether rotors detected in 2D phase maps were present at corresponding time segments and anatomical locations on 3D phase maps...
September 13, 2017: Heart Rhythm: the Official Journal of the Heart Rhythm Society
https://www.readbyqxmd.com/read/28916173/a-new-anatomical-view-on-the-vector-cardiogram-the-mean-temporal-spatial-isochrones
#3
Peter M van Dam
AIM: This proof of principle study aims to show the direct relationship between cardiac anatomy and the mean cardiac activation path as captured by the 12 lead ECG derived mean temporal-spatial isochrones (mean TSI) path. METHODS: To obtain the mean TSI signal a vector cardiographic (VCG) signal is constructed from the 12 lead ECG. The construction of the VCG signal uses a model of the heart and torso with patient specific electrode extracted from a 3D photo. The propagation of the activation through the heart is captured by estimating the mean of a cardiac activation isochrone using this VCG signal...
August 12, 2017: Journal of Electrocardiology
https://www.readbyqxmd.com/read/28914982/production-of-accurate-skeletal-models-of-domestic-animals-using-three-dimensional-scanning-and-printing-technology
#4
Fangzheng Li, Chunying Liu, Xuexiong Song, Yanjun Huan, Shansong Gao, Zhongling Jiang
Access to adequate anatomical specimens can be an important aspect in learning the anatomy of domestic animals. In this study, the authors utilized a structured light scanner and fused deposition modeling (FDM) printer to produce highly accurate animal skeletal models. First, various components of the bovine skeleton, including the femur, the fifth rib, and the sixth cervical (C6) vertebra were used to produce digital models. These were then used to produce 1:1 scale physical models with the FDM printer. The anatomical features of the digital models and three-dimensional (3D) printed models were then compared with those of the original skeletal specimens...
September 15, 2017: Anatomical Sciences Education
https://www.readbyqxmd.com/read/28912022/when-does-intraoperative-3d-imaging-play-a-role-in-transpedicular-c2-screw-placement
#5
Cornelius Jacobs, Philip P Roessler, Sebastian Scheidt, Milena M Plöger, Collin Jacobs, Alexander C Disch, Klaus D Schaser, Tony Hartwig
INTRODUCTION: The stabilization of an atlantoaxial (C1-C2) instability is demanding due to a complex atlantoaxial anatomy with proximity to the spinal cord, a variable run of the vertebral artery (VA) and narrow C2 pedicles. We perfomed the Goel & Harms fusion in combination with an intraoperative 3D imaging to ensure correct screw placement in the C2 pedicle. We hypothesized, that narrow C2 pedicles lead to a higher malposition rate of screws by perforation of the pedicle wall. The purpose of this study was to describe a certain pedicle size, under which the perforation rate rises...
September 8, 2017: Injury
https://www.readbyqxmd.com/read/28910382/refining-experimental-dental-implant-testing-in-the-g%C3%A3-ttingen-minipig-using-3d-computed-tomography-a-morphometric-study-of-the-mandibular-canal
#6
Giuliano M Corte, Johanna Plendl, Hana Hünigen, Kenneth C Richardson, Ole Gemeinhardt, Stefan M Niehues
This study reports morphometric and age-related data of the mandibular canal and the alveolar ridge of the Göttingen Minipig to avoid complications during in vivo testing of endosseus dental implants and to compare these data with the human anatomy. Using 3D computed tomography, six parameters of the mandibular canal as well as the alveolar bone height and the alveolar ridge width were measured in Göttingen Minipigs aged 12, 17 and 21 months. Our null hypothesis assumes that the age and the body mass have an influence on the parameters measured...
2017: PloS One
https://www.readbyqxmd.com/read/28906599/dual-extrusion-3d-printing-of-anatomical-models-for-education
#7
Michelle L Smith, James F X Jones
Two material 3D printing is becoming increasingly popular, inexpensive and accessible. In this paper, freely available printable files and dual extrusion fused deposition modelling were combined to create a number of functional anatomical models. To represent muscle and bone FilaFlex(3D) flexible filament and polylactic acid (PLA) filament were extruded respectively via a single 0.4 mm nozzle using a Big Builder printer. For each filament, cubes (5 mm(3) ) were printed and analyzed for X, Y, and Z accuracy...
September 14, 2017: Anatomical Sciences Education
https://www.readbyqxmd.com/read/28901659/using-gamma-index-to-flag-changes-in-anatomy-during-image-guided-radiation-therapy-of-head-and-neck-cancer
#8
Bryan Schaly, Jeff Kempe, Varagur Venkatesan, Sylvia Mitchell, Jerry J Battista
During radiation therapy of head and neck cancer, the decision to consider replanning a treatment because of anatomical changes has significant resource implications. We developed an algorithm that compares cone-beam computed tomography (CBCT) image pairs and provides an automatic alert as to when remedial action may be required. Retrospective CBCT data from ten head and neck cancer patients that were replanned during their treatment was used to train the algorithm on when to recommend a repeat CT simulation (re-CT)...
September 13, 2017: Journal of Applied Clinical Medical Physics
https://www.readbyqxmd.com/read/28901573/validation-of-a-novel-cartoseg%C3%A2-segmentation-module-software-for-contrast-enhanced-computed-tomography-guided-radiofrequency-ablation-in-patients-with-atrial-fibrillation
#9
EDITORIAL
Hasan Imanli, Shaun Bhatty, Jean Jeudy, Yousra Ghzally, Kiddy Ume, Rama Vunnam, Refael Itah, Mati Amit, John Duell, Vincent See, Stephen Shorofsky, Timm M Dickfeld
INTRODUCTION: Visualization of left atrial (LA) anatomy using image integration modules has been associated with decreased radiation exposure and improved procedural outcome when used for guidance of pulmonary vein isolation (PVI) in atrial fibrillation (AF) ablation. We evaluated the CARTOSEG™ CT Segmentation Module (Biosense Webster, Inc.) that offers a new CT-specific semi-automatic reconstruction of the atrial endocardium. METHODS: The CARTOSEG™ CT Segmentation Module software was assessed prospectively in 80 patients undergoing AF ablation...
September 13, 2017: Pacing and Clinical Electrophysiology: PACE
https://www.readbyqxmd.com/read/28891280/pelvic-floor-evaluation-with-transperineal-ultrasound-a-new-approach
#10
Francesca Vellucci, Cristina Regini, Chiara Barbanti, Stefano Luisi
The increased life expectancy, the importance of the prevention in younger age and the role of the pelvic floor disfunction not only in the disease of the third age, but also in the childbearing age, as the influence on the type of delivery, underline the importance of the evaluation of the pelvic floor. The evaluation of pelvic floor is generally clinical, but in the last 2 decades, the use of ultrasound has become a mainstream diagnostic tool in the investigation of female pelvic organ prolapse, urinary and fecal incontinence and defecation disorders, providing an immediate objective confirmation of findings obtained on clinical examination and filling some of the gaps of the urogynecological exam...
September 5, 2017: Minerva Ginecologica
https://www.readbyqxmd.com/read/28887492/freeform-fabrication-of-tissue-simulating-phantom-for-potential-use-of-surgical-planning-in-conjoined-twins-separation-surgery
#11
Shuwei Shen, Haili Wang, Yue Xue, Li Yuan, Ximing Zhou, Zuhua Zhao, Erbao Dong, Bin Liu, Wendong Liu, Barrett Cromeens, Brent Adler, Gail Besner, Ronald X Xu
Preoperative assessment of tissue anatomy and accurate surgical planning is crucial in conjoined twin separation surgery. We developed a new method that combines three-dimensional (3D) printing, assembling, and casting to produce anatomic models of high fidelity for surgical planning. The related anatomic features of the conjoined twins were captured by computed tomography (CT), classified as five organ groups, and reconstructed as five computer models. Among these organ groups, the skeleton was produced by fused deposition modeling (FDM) using acrylonitrile-butadiene-styrene...
September 8, 2017: Scientific Reports
https://www.readbyqxmd.com/read/28887263/changes-in-geometry-and-cardiac-deformation-of-the-thoracic-aorta-after-thoracic-endovascular-aortic-repair-tevar
#12
Kelsey Hirotsu, Ga-Young Suh, Jason T Lee, Michael D Dake, Dominik Fleischmann, Christopher P Cheng
BACKGROUND: TEVAR has dramatically expanded treatment options for patients with thoracic aortic pathology. The interaction between endografts and the dynamic anatomy of the thoracic aorta is not well characterized for repetitive physiologic stressors and subsequent issues related to long-term durability. Through 3D modeling we sought to quantify cardiac-induced aortic deformation before and after TEVAR to assess the impact of endografts on dynamic aortic anatomy. METHODS: Eight patients with acute (n = 4) or chronic (n = 3) Type B dissections, or chronic arch aneurysm (n = 1), underwent TEVAR with a single (n = 5) or multiple (n = 3) Gore C-TAG(s)...
September 5, 2017: Annals of Vascular Surgery
https://www.readbyqxmd.com/read/28882491/anatomic-and-high-resolution-computed-tomographic-angiography-study-of-the-lateral-femoral-condyle-flap-implications-for-surgical-dissection
#13
Mohamed Morsy, Yoo Joon Sur, Osman Akdag, Amr Eisa, Tarek A El-Gammal, Nirusha Lachman, Steven L Moran
BACKGROUND: The lateral femoral condyle (LFC) flap is a vascularized bone flap based on the superior lateral genicular artery (SLGA). Harvest technique for this flap has not yet been demonstrated. The purpose of this study was to better delineate the blood supply to the bone and skin of this flap to allow for a safe and effective harvest. MATERIALS AND METHODS: Twenty-three lower extremities were injected with latex or a mixture of latex and barium sulfate. The SLGA was identified and dissected, documenting the course, diameter, anatomical relations, length, and branches...
August 16, 2017: Journal of Plastic, Reconstructive & Aesthetic Surgery: JPRAS
https://www.readbyqxmd.com/read/28877531/towards-individualized-tracheobronchial-stents-technical-practical-and-legal-considerations
#14
Lutz Freitag, Martin Gördes, Paul Zarogoulidis, Kaid Darwiche, Daniel Franzen, Faustina Funke, Wolfgang Hohenforst-Schmidt, Hervé Dutau
Stent placement has been established as a standard procedure for treating airway obstructions. Other indications are localized malacias and fistulas. Though many different stents with various diameters and lengths are available, the shapes are hardly ever ideal because of the distorted anatomy in patients with diseased airways. There are technical and legal limitations for customizing purchased airway stents. Individually tailored stents would be preferable. New techniques of additive manufacturing such as 3D printing make it possible to produce optimized stents for a particular patient...
September 7, 2017: Respiration; International Review of Thoracic Diseases
https://www.readbyqxmd.com/read/28877098/a-3-dimensional-printed-ultrasound-probe-visuospatial-trainer
#15
Ryan T McKenna, Jesse C Dove, Robert A Ratzlaff, Jose L Diaz-Gomez, Daniel J Cox, Leslie V Simon
Training adult learners to use ultrasound in clinical practice relies on the ability of the learner to apply visuospatial concepts to the anatomy of the human body. We describe a visuospatial trainer that replicates the housing of an ultrasound transducer, through which a linear laser projects light in the same plane and orientation as the ultrasonic sound waves. We use this trainer in combination with a porcine heart dissection laboratory to teach bedside cardiac ultrasound and transthoracic echocardiography (TTE)...
September 4, 2017: Ultrasound Quarterly
https://www.readbyqxmd.com/read/28875339/c-arm-cone-beam-ct-for-intraprocedural-image-fusion-and-3d-guidance-in-portal-vein-embolization-pve
#16
Willie M Lüdemann, Georg Böning, Julius Chapiro, Martin Jonczyk, Dominik Geisel, Dirk Schnapauff, Gero Wieners, Moritz Schmelzle, Sascha Chopra, Rolf W Günther, Bernhard Gebauer, Florian Streitparth
PURPOSE: Portal vein embolization (PVE) is applied in patients with extended oncologic liver disease to induce hyperplasia of the future liver remnant and make resection feasible. Ultrasound (US) guidance is the gold standard for percutaneous portal vein access. This study evaluated feasibility and safety of C-arm cone beam computed tomography (CBCT) for needle guidance. MATERIALS AND METHODS: In 10 patients, puncture was performed under 3D needle guidance in a CBCT data set...
September 5, 2017: Cardiovascular and Interventional Radiology
https://www.readbyqxmd.com/read/28873427/computational-assessment-of-the-functional-role-of-sinoatrial-node-exit-pathways-in-the-human-heart
#17
Sanjay R Kharche, Edward Vigmond, Igor R Efimov, Halina Dobrzynski
AIM: The human right atrium and sinoatrial node (SAN) anatomy is complex. Optical mapping experiments suggest that the SAN is functionally insulated from atrial tissue except at discrete SAN-atrial electrical junctions called SAN exit pathways, SEPs. Additionally, histological imaging suggests the presence of a secondary pacemaker close to the SAN. We hypothesise that a) an insulating border-SEP anatomical configuration is related to SAN arrhythmia; and b) a secondary pacemaker, the paranodal area, is an alternate pacemaker but accentuates tachycardia...
2017: PloS One
https://www.readbyqxmd.com/read/28871106/3d-imaging-of-the-brain-morphology-and-connectivity-defects-in-a-model-of-psychiatric-disorders-map6-ko-mice
#18
Ulysse Gimenez, Benoit Boulan, Franck Mauconduit, Fanny Taurel, Maxime Leclercq, Eric Denarier, Jacques Brocard, Sylvie Gory-Fauré, Annie Andrieux, Hana Lahrech, Jean Christophe Deloulme
In the central nervous system, microtubule-associated protein 6 (MAP6) is expressed at high levels and is crucial for cognitive abilities. The large spectrum of social and cognitive impairments observed in MAP6-KO mice are reminiscent of the symptoms observed in psychiatric diseases, such as schizophrenia, and respond positively to long-term treatment with antipsychotics. MAP6-KO mice have therefore been proposed to be a useful animal model for these diseases. Here, we explored the brain anatomy in MAP6-KO mice using high spatial resolution 3D MRI, including a volumetric T1w method to image brain structures, and Diffusion Tensor Imaging (DTI) for white matter fiber tractography...
September 4, 2017: Scientific Reports
https://www.readbyqxmd.com/read/28870873/the-kinematic-alignment-technique-for-tka-reliably-aligns-the-femoral-component-with-the-cylindrical-axis
#19
Charles Riviere, FarhadIranpour, Simon Harris, Edouard Auvinet, ArashAframian, Patrick Chabrand, Justin Cobb
INTRODUCTION: Kinematic alignment (KA) technique is an alternative technique for positioning a TKA, which aims a patient-specific implant positioning in order to reproduce the pre-arthritic knee anatomy. Because reliability in implant positioning is of interest to obtain reproducible good functional results, our study tests the hypothesis that the medial and lateral distal and posterior positions of the planned and surgically implantedkinematically aligned femoralcomponentare similar...
September 1, 2017: Orthopaedics & Traumatology, Surgery & Research: OTSR
https://www.readbyqxmd.com/read/28866840/topography-of-the-human-acoustic-radiation-as-revealed-by-ex-vivo-fibers-micro-dissection-and-in-vivo-diffusion-based-tractography
#20
Chiara Maffei, Jorge Jovicich, Alessandro De Benedictis, Francesco Corsini, Mattia Barbareschi, Franco Chioffi, Silvio Sarubbo
The acoustic radiation is a compact bundle of fibers conveying auditory information from the medial geniculate nucleus of the thalamus to the auditory cortex. Topographical knowledge of this bundle in primates is scarce and in vivo diffusion-based tractography reconstructions in humans remains challenging, especially with the most widely used MRI acquisition protocols. Therefore, the AR represents a notable anatomical omission in the neurobiological investigation of acoustic and linguistic functional mechanisms in humans...
September 2, 2017: Brain Structure & Function
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