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https://www.readbyqxmd.com/read/28106705/repair-of-orbital-floor-fracture-with-modified-transnasal-endoscopic-approach-through-anterior-space-to-nasolacrimal-duct
#1
Motohiko Suzuki, Yoshihisa Nakamura, Shinya Ozaki, Makoto Yokota, Shingo Murakami
OBJECTIVES: Endoscopic approach provides excellent magnification and visualization, and a purely transnasal approach is minimally invasive method. However, it is very difficult to repair anterior and lateral fractures with the previous transnasal endoscopic approaches, since repair of orbital fractures is managed through the middle meatus and ostium from the posterior side of the nasolacrimal duct with side-viewing endoscope and curved instruments. Therefore, the authors used modified transnasal endoscopic approach as an alternative for repair of orbital floor fractures in order to effectively reach the lateral or anterior fracture of the orbital floor with straight endoscope and instruments endoscopically...
January 18, 2017: Journal of Craniofacial Surgery
https://www.readbyqxmd.com/read/28074281/one-step-cad-cam-titanium-cranioplasty-after-drilling-template-assisted-resection-of-intraosseous-skull-base-meningioma-technical-note
#2
A Carolus, S Weihe, K Schmieder, C Brenke
INTRODUCTION: Cranial defects following intra-osseous tumor removal may be large and require adequate reconstruction. CAD/CAM implants have been used for years to achieve an optimal cosmetic result. The disadvantage is that such implants require a second surgery. A preoperative virtual planning of resection margins and the simultaneously fabrication of the cranioplasty could be a possibility to subsume the steps tumor resection and cosmetic restoration to a single procedure. METHODS: We present two cases of patients with complex intra-osseous spheno-orbital meningioma...
January 10, 2017: Acta Neurochirurgica
https://www.readbyqxmd.com/read/28064284/surgery-modified-pi-with-triple-bonnet-flap-and-fronto-orbital-advancement
#3
Uday Singh Raswan, Sarbjit Singh Chhiber, Altaf Umar Ramzan
INTRODUCTION: Craniosynostosis is the premature fusion of one or more of the cranial sutures and can occur as part of a syndrome or as an isolated defect. Pansynostosis is a rare form of craniosynostosis that involves premature fusion of all the cranial sutures (coronal, sagittal, metopic, and occipital). Particularly in cases of late presentation, there are heightened clinical concerns, both functional and aesthetic. In untreated cases of pansynostosis and increased intracranial pressure, optic nerve damage progresses to optic atrophy and then blindness...
January 7, 2017: Pediatric Neurosurgery
https://www.readbyqxmd.com/read/28059173/geometric-phase-shaping-of-terahertz-vortex-beams
#4
Amalya Minasyan, Clément Trovato, Jérôme Degert, Eric Freysz, Etienne Brasselet, Emmanuel Abraham
We propose a topological beam-shaping strategy of terahertz (THz) beams using geometric phase elements made of space-variant birefringent slabs. Quasi-monochromatic THz vortex beams are produced and characterized both in amplitude and phase from the reconstructed real-time two-dimensional imaging of the electric field. Nonseparable superpositions of such vortex beams are also obtained and characterized by two-dimensional polarimetric analysis. These results emphasize the versatility of the spin-orbit electromagnetic toolbox to prepare on-demand structured light endowed with polarization-controlled orbital angular momentum content in the THz domain, which should find many uses in future THz technologies...
January 1, 2017: Optics Letters
https://www.readbyqxmd.com/read/28048450/su-g-iep4-02-application-of-changs-attenuation-correction-technique-for-spect-partial-angle-acquisition-of-jaszczak-phantom
#5
K Saha, J Barbarits, R Humenik, J Johnson, B Murray, S Hoyt
PURPOSE: Chang's mathematical formulation is a common method of attenuation correction applied on reconstructed Jaszczak phantom images. Though Chang's attenuation correction method has been used for 360° angle acquisition, its applicability for 180° angle acquisition remains a question with one vendor's camera software producing artifacts. The objective of this work is to ensure that Chang's attenuation correction technique can be applied for reconstructed Jaszczak phantom images acquired in both 360° and 180° mode...
June 2016: Medical Physics
https://www.readbyqxmd.com/read/28047217/we-ab-bra-08-correction-of-patient-motion-in-c-arm-cone-beam-ct-using-3d-2d-registration
#6
S Ouadah, M Jacobson, J W Stayman, T Ehtiati, J H Siewerdsen
PURPOSE: Intraoperative C-arm cone-beam CT (CBCT) is subject to artifacts arising from patient motion during the fairly long (∼5-20 s) scan times. We present a fiducial free method to mitigate motion artifacts using 3D-2D image registration that simultaneously corrects residual errors in geometric calibration. METHODS: A 3D-2D registration process was used to register each projection to DRRs computed from the 3D image by maximizing gradient orientation (GO) using the CMA-ES optimizer...
June 2016: Medical Physics
https://www.readbyqxmd.com/read/28047185/we-ab-207a-02-john-s-equation-based-consistency-condition-and-incomplete-projection-restoration-upon-circular-orbit-cbct
#7
J Ma, H Qi, S Wu, H Yan, Y Xu, L Zhou
PURPOSE: In transmitted X-ray tomography imaging, projections are sometimes incomplete due to a variety of reasons, such as geometry inaccuracy, defective detector cells, etc. To address this issue, we have derived a direct consistency condition based on John's Equation, and proposed a method to effectively restore incomplete projections based on this consistency condition. METHODS: Through parameter substitutions, we have derived a direct consistency condition equation from John's equation, in which the left side is only projection derivative of view and the right side is projection derivative of other geometrical parameters...
June 2016: Medical Physics
https://www.readbyqxmd.com/read/28045828/bilateral-malar-reconstruction-using-patient-specific-polyether-ether-ketone-implants-in-treacher-collins-syndrome-patients-with-absent-zygomas
#8
David C G Sainsbury, Alan George, Christopher R Forrest, John H Phillips
The authors performed bilateral malar reconstruction using polyether ether ketone implants in 3 patients with Treacher-Collins syndrome with absent, as opposed to hypoplastic, zygomata. These patient-specific implants were fabricated using computed-aided design software reformatted from three-dimensional bony preoperative computed tomography images. The first time the authors performed this procedure the implant compressed the globe resulting in temporary anisocoria that was quickly recognized intraoperatively...
December 30, 2016: Journal of Craniofacial Surgery
https://www.readbyqxmd.com/read/28045820/magnet-retained-orbital-prosthesis-using-a-dental-implant
#9
Soung Min Kim
The loss of an eye and the associated facial disharmony has major physical, psychological, and social consequences for patients undergoing orbital exenteration. A magnet-retained prosthesis with an implant has various advantages over both adhesive and spectacle-retained prostheses for reconstruction of the exenterated orbit.The author demonstrates one representative patient with our orbital reconstruction patients with magnetic implants, which will be applied to various maxillofacial prosthesis strategies in the near future...
December 30, 2016: Journal of Craniofacial Surgery
https://www.readbyqxmd.com/read/28038736/-bone-cement-implant-as-an-alternative-for-orbital-floor-reconstruction-a-case-report
#10
Enrique Vargas-Solalinde, Marisol E Huichapa-Padilla, Daniel Garza-Cantú, Víctor H Reyna-Martínez, Julio Alatorre-Ricardo, Juan Luis González-Treviño
BACKGROUND: The management of orbitary fractures is one of the most challenging in facial trauma; the variety of reconstruction materials for its treatment is broad and is constantly improving, but despite this there is no consensus for its use or literature that sustains it. OBJECTIVE: To present the use and design of a preformed bone implant as an alternative for the reconstruction of orbital floor fractures in the pediatric age group. CLINICAL CASE: A 7-year old male who suffered a right hemifacial contusion trauma with clinical and tomographic diagnosis of right pure blowout type orbital floor fracture with inferior rectus muscle entrapment and right post-traumatic palpebral ptosis...
December 27, 2016: Cirugia y Cirujanos
https://www.readbyqxmd.com/read/28038480/intracranial-ameloblastoma-arising-from-the-maxilla-an-interdisciplinary-surgical-approach
#11
Johanna Quick-Weller, Felix Koch, Nazife Dinc, Stephanie Lescher, Peter Baumgarten, Patrick Harter, Friedrich Scheerer, Robert Sader, Volker Seifert, Gerhard Marquardt, Thomas Freiman
Background Ameloblastomas are a rare tumor entity accounting for only 10% of all odontogenic tumors. They mostly originate from the mandible. Only a few cases are known to grow aggressively and to invade the orbit, nasal cavity, or even the brain. Patient and Methods/Case Report We present the case of a 57-year-old patient who was admitted with a huge tumor involving the nasal cavity, the left maxilla, and the anterior fossa. Histologic diagnosis was made by biopsy. A combined two-stage neurosurgical maxillofacial approach was planned...
December 30, 2016: Journal of Neurological Surgery. Part A, Central European Neurosurgery
https://www.readbyqxmd.com/read/28034625/patient-specific-biodegradable-implant-in-pediatric-craniofacial-surgery
#12
H Essig, D Lindhorst, T Gander, P Schumann, D Könü, S Altermatt, M Rücker
Surgical correction of premature fusion of calvarial sutures involving the fronto-orbital region can be challenging due to the demanding three-dimensional (3D) anatomy. If fronto-orbital advancement (FOA) is necessary, surgery is typically performed using resorbable plates and screws that are bent manually intraoperatively. A new approach using individually manufactured resorbable implants (KLS Martin Group, Tuttlingen, Germany) is presented in the current paper. Preoperative CT scan data were processed in iPlan (ver...
November 30, 2016: Journal of Cranio-maxillo-facial Surgery
https://www.readbyqxmd.com/read/28027434/ultralow-1-f-noise-in-a-heterostructure-of-superconducting-epitaxial-cobalt-disilicide-thin-film-on-silicon
#13
Shao-Pin Chiu, Sheng-Shiuan Yeh, Chien-Jyun Chiou, Yi-Chia Chou, Juhn-Jong Lin, Chang-Chyi Tsuei
High-precision resistance noise measurements indicate that the epitaxial CoSi2/Si heterostructures at 150 and 2 K (slightly above its superconducting transition temperature Tc of 1.54 K) exhibit an unusually low 1/f noise level in the frequency range of 0.008-0.2 Hz. This corresponds to an upper limit of Hooge constant γ ≤ 3 × 10(-6), about 100 times lower than that of single-crystalline aluminum films on SiO2 capped Si substrates. Supported by high-resolution cross-sectional transmission electron microscopy studies, our analysis reveals that the 1/f noise is dominated by excess interfacial Si atoms and their dimer reconstruction induced fluctuators...
December 30, 2016: ACS Nano
https://www.readbyqxmd.com/read/28027253/evidence-based-medicine-evaluation-and-treatment-of-zygoma-fractures
#14
Craig B Birgfeld, Gerhard S Mundinger, Joseph S Gruss
LEARNING OBJECTIVES: After studying this article, the participant should be able to: 1. Diagnose zygomaticomaxillary complex fractures from physical examination and radiographic findings. 2. Plan the necessary surgical approaches for operative treatment of zygomaticomaxillary complex fractures depending on severity. 3. Understand the three-dimensional anatomy of the orbit and zygomaticomaxillary complex and the importance of the zygomaticosphenoid suture along the lateral orbital sidewall...
January 2017: Plastic and Reconstructive Surgery
https://www.readbyqxmd.com/read/28027185/use-of-virtual-surgical-planning-for-simultaneous-maxillofacial-osteotomies-and-custom-polyetheretherketone-implant-in-secondary-orbito-frontal-reconstruction-importance-of-restoring-orbital-volume
#15
Neel Patel, Beomjune Kim, Waleed Zaid
Correction of orbito-frontal defects involves a multitude of surgical challenges, and requires careful and detailed planning. In the trauma setting, one must be prepared to deal with injuries to adjacent structures and be able to incorporate their repair into the surgical plan to maximize the functional and esthetic reconstruction for the benefit of the patient. Victims who have sustained trauma of the cranial complex in combination with mid-facial trauma, particularly involving the orbit, present a difficult scenario, especially when future ocular prosthetic rehabilitation is a concern...
December 23, 2016: Journal of Craniofacial Surgery
https://www.readbyqxmd.com/read/28027179/sliced-costochondral-chip-grafts-in-posttraumatic-enophthalmos-correction
#16
Tae-Hoon Kim, Ie-Hyon Park, Sa-Hyeok Hong, Seok-Chan Eun
BACKGROUND: Posttraumatic enophthalmos is a relatively common problem following orbitozygomatic fractures. However, inadequate long-term results are frequently observed due to the difficulty of performing intraoperative fine adjustments to soft-tissue volume and orbital size and gradual absorption of some grafted materials. Here, the authors describe an efficient method of enophthalmos correction using sliced costochondral bone and cartilage combination grafts. METHODS: From 2005 to 2011, the authors corrected enophthalmos in 12 patients using sliced costochondral grafts...
December 23, 2016: Journal of Craniofacial Surgery
https://www.readbyqxmd.com/read/28012843/validation-of-a-novel-cognitive-simulator-for-orbital-floor-reconstruction
#17
Renata Khelemsky, Brianna Hill, Daniel Buchbinder
PURPOSE: The increasing focus on patient safety in current medical practice has promoted the development of surgical simulation technology in the form of virtual reality (VR) training designed largely to improve technical skills and less so for nontechnical aspects of surgery such as decision making and material knowledge. The present study investigated the validity of a novel cognitive VR simulator called Touch Surgery for a core maxillofacial surgical procedure: orbital floor reconstruction (OFR)...
December 11, 2016: Journal of Oral and Maxillofacial Surgery
https://www.readbyqxmd.com/read/28009182/orbital-dependent-band-narrowing-revealed-in-an-extremely-correlated-hund-s-metal-emerging-on-the-topmost-layer-of-sr_-2-ruo_-4
#18
Takeshi Kondo, M Ochi, M Nakayama, H Taniguchi, S Akebi, K Kuroda, M Arita, S Sakai, H Namatame, M Taniguchi, Y Maeno, R Arita, S Shin
We use a surface-selective angle-resolved photoemission spectroscopy and unveil the electronic nature on the topmost layer of Sr_{2}RuO_{4} crystal, consisting of slightly rotated RuO_{6} octahedrons. The γ band derived from the 4d_{xy} orbital is found to be about three times narrower than that for the bulk. This strongly contrasts with a subtle variation seen in the α and β bands derived from the one-dimensional 4d_{xz/yz}. This anomaly is reproduced by the dynamical mean-field theory calculations, introducing not only the on-site Hubbard interaction but also the significant Hund's coupling...
December 9, 2016: Physical Review Letters
https://www.readbyqxmd.com/read/28005795/orbitocranial-fibrous-dysplasia-outcome-of-radical-resection-and-immediate-reconstruction-with-titanium-mesh-and-pericranial-flap
#19
Khalid Nasser Fadle, Ahmed Gaber Hassanein, Abdin K Kasim
INTRODUCTION: Fibrous dysplasia (FD) is a non-neoplastic developmental fibro-osseous disease. It represents 2.5% of all bone tumors and 5% to 7% of the benign bone tumors. Orbitocranial region is involved in about 20% of the patients. The main presentations are craniofacial deformity and headache. Loss of vision is the most devastating result of this disease. There is no medical treatment to cure or prevent FD. Radiation therapy is contraindicated. Surgery for the orbitocranial FD is often challenging because of the proximity of neurovascular and ocular structures...
November 2016: Journal of Craniofacial Surgery
https://www.readbyqxmd.com/read/28005771/ocular-reconstruction-using-bone-anchored-implants-in-irradiated-facial-deformities-after-tumor-extirpation
#20
Mansher Singh, Raquel Minasian, Matthew Jackson, E J Caterson
BACKGROUND: Surgical resection of ocular malignancies can result in complex craniofacial defects that can be difficult to reconstruct with conventional reconstruction techniques. Craniofacial prosthesis supported by bone-anchored implants has evolved as a reliable alternative in such scenarios. METHODS: The authors describe a patient who underwent extensive facial resection secondary to squamous cell carcinoma resulting in significant facial deformities. A bone-anchored osseointegrated implant was used to perform facial reconstruction...
November 2016: Journal of Craniofacial Surgery
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