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Jiaquan Yan, Haixin Sun, Hailan Chen, Naveed Ur Rehman Junejo, En Cheng
In this paper, a novel time-frequency signature using resonance-based sparse signal decomposition (RSSD), phase space reconstruction (PSR), time-frequency distribution (TFD) and manifold learning is proposed for feature extraction of ship-radiated noise, which is called resonance-based time-frequency manifold (RTFM). This is suitable for analyzing signals with oscillatory, non-stationary and non-linear characteristics in a situation of serious noise pollution. Unlike the traditional methods which are sensitive to noise and just consider one side of oscillatory, non-stationary and non-linear characteristics, the proposed RTFM can provide the intact feature signature of all these characteristics in the form of a time-frequency signature by the following steps: first, RSSD is employed on the raw signal to extract the high-oscillatory component and abandon the low-oscillatory component...
March 22, 2018: Sensors
Michele P Grieco, Nicolò Bertozzi, Eugenio Grignaffini, Edoardo Raposio
The skin cancers of the head and neck district are localized mostly on the nose, which, by being in the center of the mid-face, has an important aesthetic role. Therefore, many reconstructive techniques have been studied; among them regional skin flaps appeared the most suitable since they guaranteed the oncological radicality as well as a good aesthetic outcome. In this paper, we present our experience with the use of the Zitelli bilobed flap, which is defined as a double transposition flap for the reconstruction of the nose defects...
April 2018: Giornale Italiano di Dermatologia e Venereologia: Organo Ufficiale, Società Italiana di Dermatologia e Sifilografia
Claudio Chillemi, Matteo Mantovani, Antonio Gigante
Superior capsular reconstruction (SCR) demonstrated its efficacy as a treatment option available in patients affected with irreparable posterosuperior rotator cuff tears without any signs of arthritis. Originally, the fascia lata autograft was fixed medially to the glenoid (with two or more anchors) and laterally to the greater tuberosity (with a compression double-row technique using four anchors or three transosseous tunnels). Additionally, side-to-side sutures were used to anteriorly and posteriorly connect the graft to the native residual rotator cuff tissue...
March 21, 2018: European Journal of Orthopaedic Surgery & Traumatology: Orthopédie Traumatologie
Dyre Kleive, Mushegh A Sahakyan, Ammar Khan, Bjarte Fosby, Pål-Dag Line, Knut Jørgen Labori
PURPOSE: The incidence of intraoperative arterial injury during pancreatectomy is not well described. This study aims to evaluate the incidence, management, and outcome of arterial injuries during pancreatectomy. METHODS: This is a retrospective study of 1535 consecutive patients undergoing pancreatectomy between 2006 and 2016 at Oslo University Hospital. The type of arterial injury and potential contributing factors were analyzed. Short-term outcomes were compared between patients with arterial injury and patients undergoing a planned arterial resection due to tumor involvement...
March 21, 2018: Langenbeck's Archives of Surgery
Adrienne L K Li, Kristin Wadsworth, Naveed T Siddiqui, May Alarab, Colleen D McDermott, Nucelio Lemos, Ashraf Dawood, Danny Lovatsis
INTRODUCTION AND HYPOTHESIS: Pre-emptive gabapentin has been shown to decrease postoperative pain in abdominal and vaginal hysterectomy. However, the effect of pre-emptive low-dose gabapentin has not been studied in vaginal hysterectomy combined with concomitant pelvic reconstruction. METHODS: A randomized double-blind placebo-controlled trial assessed all women seen for symptomatic prolapse requiring vaginal hysterectomy with concomitant pelvic reconstruction with or without midurethral sling...
March 21, 2018: International Urogynecology Journal
Mustafa Zakkar, Vito Domanico Bruno, Alexandru Ciprian Visan, Stephanie Curtis, Gianni Angelini, Emmanuel Lansac, Serban Stoica
Aortic valve replacement is the gold standard for the management of patients with severe aortic stenosis or mixed pathology that is not amenable to repair according to currently available guidelines. Such a simplified approach may be suitable for many patients, but it is far from ideal for young adults considering emerging evidence demonstrating that conventional valve replacement in this cohort of patients is associated with inferior long-term survival when compared to the general population. Moreover; the utilisation of mechanical and bioprosthetic valves can significantly impact on quality and is linked to increased rates of morbidities...
2018: Frontiers in Surgery
Hyo Seok Jang, Young Ho Lee, Min Bom Kim, Joo Young Chung, Hyun Sik Seok, Goo Hyun Baek
Background: A skin defect of the hand and wrist is a common manifestation in industrial crushing injuries, traffic accidents or after excision of tumors. We reconstructed a skin defect in the ulnar aspect of the hand and wrist with a perforator-based propeller flap from the ulnar artery. The aims of our study are to evaluate the utility and effectiveness of this flap and to discuss the advantages and disadvantages of the flap in hand and wrist reconstruction with a review of the literature...
March 2018: Clinics in Orthopedic Surgery
Fawz Kazzazi, Rosanna C Ching, Charles M Malata
Introduction: Thin women have fewer autologous tissue breast reconstructive options than their higher body mass index counterparts-due to a lack of adequate donor sites. They are therefore usually offered expander/implant techniques. The total autologous latissimus dorsi flap is generally used in "well-padded" individuals, as they have enough fat on their back on which a completely autologous reconstruction could be based. When implant-based reconstruction is contraindicated (for instance due to planned adjuvant radiotherapy) or unacceptable to the patient, the total autologous latissimus dorsi flap can provide adequate tissue volume by utilizing the additional back fat deposits even in the thin, small-breasted patient...
2018: Eplasty
Soomin Jeon, Chang-Ock Lee
BACKGROUND: Streak artifacts in computed tomography (CT) images caused by metallic objects limit the wider use of CT imaging technologies. There have been various attempts to improve CT images containing streak artifacts; however, most of them generate additional artifacts or do not completely eradicate existing artifacts. OBJECTIVE: In this paper, we propose a novel algorithm which reduces streak artifacts in CT images. METHODS: Using CT numbers reconstructed from a given sinogram, we extract the metal part M and the surrounding area C with similar CT numbers...
March 15, 2018: Journal of X-ray Science and Technology
Julia Mascolo-Fortin, Dmitri Matenine, Louis Archambault, Philippe Després
BACKGROUND: Four-dimensional cone beam computed tomography allows for temporally resolved imaging with useful applications in radiotherapy, but raises particular challenges in terms of image quality and computation time. OBJECTIVE: The purpose of this work is to develop a fast and accurate 4D algorithm by adapting a GPU-accelerated ordered subsets convex algorithm (OSC), combined with the total variation minimization regularization technique (TV). METHODS: Different initialization schemes were studied to adapt the OSC-TV algorithm to 4D reconstruction: each respiratory phase was initialized either with a 3D reconstruction or a blank image...
March 15, 2018: Journal of X-ray Science and Technology
Can Ilker Demir, Emrah Kağan Yaşar, Kivanç Davun, Aykut Gök, Ceyhun Uzun, Murat Şahin Alagöz
The nose anatomy is a functional and aesthetically important organ because of its three-dimensional structure, visible location in the face region, and its connection with the respiratory tract. Aesthetic and reconstructive nasal surgery requires correction of deformations in cartilage and bone structures as well as preservation of the natural connections between all subunits. The minimal mistake made can result in functional or aesthetically bad results. In this study, the authors aimed to create an experimental nose model that help aesthetic and reconstructive nose surgery operations...
March 20, 2018: Journal of Craniofacial Surgery
William Abouhassan, John Kuang Chao, Ananth S Murthy
BACKGROUND: Craniosynostosis is an uncommon complication after shunting procedures for congenital hydrocephalus. We report a case of a child with myelomeningocele and normocephaly at the time of birth. She underwent ventricular shunting for Chiari malformation and hydrocephalus at 3 days of age. An immediate postoperative CT scan confirmed all sutures were open. Serial CT scans document an open metopic suture at 2 months, closed metopic suture at 5 months, and trigonocephaly at 11 months with concomitant slit ventricle syndrome, and collapsed lateral and third ventricles...
March 20, 2018: Journal of Craniofacial Surgery
Chi S Yoon, Chang G Kim, Hoon Kim, Kyu N Kim
This study aimed to present a simple, fast, and safe technique, called freestyle perforator-based peninsular flap (FPBPF), for pressure sore reconstruction.Among the 21 patients who underwent pressure sore reconstruction between May 2013 and October 2016, 12 patients (Group A) and 9 patients (Group B) were subjected to perforator-based island flap (PBIF) and FPBPF, respectively. We retrospectively reviewed and statistically analyzed the data of both groups.All flaps completely survived in both groups. No significant differences were found in patient demographics, complications, hospital stay, and follow-up period...
March 2018: Medicine (Baltimore)
Cui Feng, Di Zhu, Xianlun Zou, Anqin Li, Xuemei Hu, Zhen Li, Daoyu Hu
To investigate the subjective and quantitative image quality and radiation exposure of CT enterography (CTE) examination performed at low tube voltage and low concentration of contrast agent with adaptive statistical iterative reconstruction (ASIR) algorithm, compared with conventional CTE.One hundred thirty-seven patients with suspected or proved gastrointestinal diseases underwent contrast enhanced CTE in a multidetector computed tomography (MDCT) scanner. All cases were assigned to 2 groups. Group A (n = 79) underwent CT with low tube voltage based on patient body mass index (BMI) (BMI < 23 kg/m, 80 kVp; BMI ≥ 23 kg/m, 100 kVp) and low concentration of contrast agent (270 mg I/mL), the images were reconstructed with standard filtered back projection (FBP) algorithm and 50% ASIR algorithm...
March 2018: Medicine (Baltimore)
Erin Honcharuk, Stephen Kayiaros, Lee E Rubin
Addressing acetabular bone defects can be difficult and depends on the amount of bone loss. Augments, either with bone or highly porous metals, are options that still allow the use of a hemispherical cup. Almost all previous research and publication on acetabular augments have focused on revision hip arthroplasty utilizing either a modified lateral or a posterolateral surgical approach. We describe 3 cases of augmenting acetabular bone defects through a direct anterior approach for primary total hip arthroplasty...
March 2018: Arthroplasty Today
Levi Reina Fernandes, Herve Ouanezar, Adnan Saithna, Bertrand Sonnery-Cottet
The Segond fracture (SF) is considered pathognomonic of an anterior cruciate ligament (ACL) tear. However, the anatomy of the soft-tissue attachments responsible for the avulsion of SFs has been a cause of controversy. A 31-year-old male patient presented with an injury to his right knee that resulted in ACL tear and a SF. Open SF fixation and arthroscopic ACL reconstruction were performed. The anatomical dissection demonstrated that the avulsion of SFs had occurred because of the tibial attachment of the anterolateral ligament (ALL) with an intact Iliotibial band...
March 20, 2018: BMJ Case Reports
Esben S Worm, Morten Høyer, Rune Hansen, Lars P Larsen, Britta Weber, Cai Grau, Per R Poulsen
PURPOSE: Intrafraction motion can compromise the treatment accuracy in liver stereotactic body radiation therapy (SBRT). Respiratory gating can improve treatment delivery; however, gating based on external motion surrogates is inaccurate. The present study reports the use of Calypso-based internal electromagnetic motion monitoring for gated liver SBRT. METHODS AND MATERIALS: Fifteen patients were included in a study of 3-fraction respiratory gated liver SBRT guided by 3 implanted electromagnetic transponders...
February 13, 2018: International Journal of Radiation Oncology, Biology, Physics
Weilin Zeng, Ling Sun, Zheng Xiang, Na Li, Jie Zhang, Yongshu He, Qing Li, Fang Yang, Jingling Song, James Morris, Benjamin M Rosenthal, Le Sun, Huaie Liu, Zhaoqing Yang
While Sarcocystis parasites from the muscles of donkey and horse have been characterized as different species, similarities between the parasites in these host raises questions about this assignment (Levine and Tadros, 1980; Matuschka, 1983; Odening et al., 1995b). To resolve this, we examined the tissue cysts of Sarcocystis collected from donkeys and horses were studied by morphological and molecular methods. Morphological studies performed by light microscopy (LM) revealed that each of two types of cysts were present in samples from each host type...
March 15, 2018: Veterinary Parasitology
Eliza W Beal, Neil D Saunders, Joseph F Kearney, Ezra Lyon, Lai Wei, Malcom H Squires, Linda X Jin, David J Worhunsky, Konstantinos I Votanopoulos, Aslam Ejaz, George Poultsides, Ryan C Fields, Douglas Swords, Alexandra W Acher, Sharon M Weber, Shishir K Maithel, Timothy Pawlik, Carl R Schmidt
The objective of this study is to assess the accuracy of the American College of Surgeons National Surgical Quality Improvement Program online risk calculator for estimating risk after operation for gastric cancer using the United States Gastric Cancer Collaborative. Nine hundred and sixty-five patients who underwent resection of gastric adenocarcinoma between January 2000 and December 2012 at seven academic medical centers were included. Actual complication rates and outcomes for patients were compared. Most of the patients underwent total gastrectomy with Roux-en-Y reconstruction (404, 41...
March 1, 2018: American Surgeon
Sean Baran, Jeffrey G Belisle, Erin K Granger, Robert Z Tashjian
OBJECTIVES: To analyze the functional and radiographic outcomes of anatomic coracoclavicular ligament reconstruction (ACCR) using allograft tendon without interference screw fixation. DESIGN: Retrospective nonrandomized study. SETTING: Level I trauma center (University Hospital). PATIENTS: Seventeen patients (mean age of 44 years) with Rockwood III through V acromioclavicular joint disruptions. Twelve of 17 patients had a primary reconstruction, including 4 patients sustaining their injuries as part of a polytrauma incident...
April 2018: Journal of Orthopaedic Trauma
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