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https://www.readbyqxmd.com/read/28447959/using-measurable-dosimetric-quantities-to-characterize-the-inter-structural-tradeoff-in-inverse-planning
#1
Hongcheng Liu, Peng Dong, Lei Xing
Traditional inverse planning relies on the use of weighting factors to balance the conflicting requirements of different structures. The manual trial-and-error determination of the weighting factors has long been recognized as a time-consuming part of treatment planning. The purpose of this work is to develop an inverse planning framework that parameterizes the dosimetric tradeoff among the structures with physically meaningful quantities to simplify the search for clinically sensible plans. In this formalism, instead of using the weighting factors, permissible variation range of the prescription dose or dose volume histogram (DVH) of the involved structures are used to characterize the "importance" of the structures...
April 27, 2017: Physics in Medicine and Biology
https://www.readbyqxmd.com/read/28446075/comparison-of-bronchoscopy-guided-and-real-time-ultrasound-guided-percutaneous-dilatational-tracheostomy-safety-complications-and-effectiveness-in-critically-ill-patients
#2
Aykut Sarıtaş, Muhammed M Kurnaz
OBJECTIVE: To compare the efficacy, safety, and incidence of complications between fiber-optic bronchoscopy-guided percutaneous dilatational tracheostomy (FOB-PDT) and ultrasound-guided percutaneous dilatational tracheostomy (US-PDT) and to determine whether US-PDT is a viable alternative to FOB-PDT. METHODS: This randomized prospective study was carried out in 80 patients who were randomly divided into US-PDT and FOB-PDT groups. Demographic data and Acute Physiology and Chronic Health Evaluation II (APACHE II), procedure duration, hemorrhage status, complications, procedure difficulty, displacement of entry location after US, and hemodynamic data were evaluated in both groups...
January 1, 2017: Journal of Intensive Care Medicine
https://www.readbyqxmd.com/read/28444772/multi-atlas-approach-with-local-registration-goodness-weighting-for-mri-based-electron-density-mapping-of-head-and-neck-anatomy
#3
Reza Farjam, Neelam Tyagi, Harini Veeraraghavan, Aditya Apte, Kristen Zakian, Margie A Hunt, Joseph O Deasy
PURPOSE: The growing use of magnetic resonance imaging (MRI) as a substitute for computed tomography-based treatment planning requires the development of effective algorithms to generate electron density maps for treatment planning and patient setup verification. The purpose of this work was to develop a method to synthesize computerized tomography (CT) for MR-only radiotherapy of head and neck cancer patients. METHODS: The algorithm is based on registration of multiple patient datasets containing both MRI and CT images (a "multi-atlas" algorithm)...
April 26, 2017: Medical Physics
https://www.readbyqxmd.com/read/28444749/transurethral-removal-of-a-cystic-urolith-in-a-mare-using-a-laparoscopic-specimen-pouch
#4
A J Williamson, A O McKinnon
CASE REPORT: Cystic urolithiasis is the most common form of urolithiasis reported in horses. In contrast to the gelding or stallion, clinical disease is less common in the mare and manual removal techniques are possible because of their shorter, wider urethral anatomy. However, these manual removal techniques can be traumatic and are limited by the size of the urolith. This report describes the use of a commercial laparoscopic specimen pouch to remove a cystic urolith in a mare. CONCLUSION: This approach may allow the extraction of larger uroliths per urethra in the mare, while affording some protection to the mucosa of the bladder neck and urethra...
May 2017: Australian Veterinary Journal
https://www.readbyqxmd.com/read/28444241/cervical-spine-muscle-tendon-unit-length-differences-between-neutral-and-forward-head-postures-biomechanical-study-using-human-cadaveric-specimens
#5
Saeed Khayatzadeh, Olivia A Kalmanson, Dale Schuit, Robert M Havey, Leonard I Voronov, Alexander J Ghanayem, Avinash G Patwardhan
Background: Forward Head Posture (FHP) may be associated with neck pain and poor health-related quality of life. Literature describes only qualitative muscle length changes associated with FHP. Objective: To quantify how muscle-tendon unit lengths are altered when human cadaveric specimens are placed in alignments representing different severities of FHP. Design: Biomechanical study using 13 fresh-frozen cadaveric cervical spine specimens (Occiput-T1, 54±15yrs)...
April 21, 2017: Physical Therapy
https://www.readbyqxmd.com/read/28439612/-imaging-of-the-paranasal-sinuses-and-anterior-skull-base
#6
S Greschus, F Albert, K W G Eichhorn
Due to the complex anatomy of the anterior skull base and paranasal sinuses, radiologic diagnostics in this area are challenging. Magnetic resonance imaging (MRI) and computed tomography (CT) are the primary indicated modalities. Guidelines helping to select the appropriate modality have been published by the German Society of Head and Neck Radiology and the Society of Otorhinolaryngology. The present article presents an overview of the current radiologic procedures and their optimized implementation using clinical examples...
April 21, 2017: HNO
https://www.readbyqxmd.com/read/28437341/measurement-of-thoracic-inlet-alignment-on-mri-reliability-and-the-influence-of-body-position
#7
Jun Qiao, Feng Zhu, Zhen Liu, Leilei Xu, Zezhang Zhu, Bangping Qian, Xu Sun, Qing Jiang, Yong Qiu
STUDY DESIGN: A retrospective radiographic study. OBJECTIVE: To investigate the reliability of using magnetic resonance imaging (MRI) to measure thoracic outlet parameters and whether supine MRI could supersede upright x-ray in measuring these parameters. SUMMARY OF BACKGROUND DATA: On x-ray, overlapped soft and bony tissues make sternum contour invisible. Thus, measuring thoracic inlet (TI) alignment on x-ray may be inaccurate. MRI could clearly show anatomy around TI...
May 2017: Clinical Spine Surgery
https://www.readbyqxmd.com/read/28434539/evolutionary-anatomy-of-the-neandertal-ulna-and-radius-in-the-light-of-the-new-el-sidr%C3%A3-n-sample
#8
Laura Pérez-Criado, Antonio Rosas
This paper aims to improve our understanding of the phylogenetic trait polarity related to hominin forearm evolution, in particular those traits traditionally defined as "Neandertal features." To this aim, twelve adult and adolescent fragmented forelimb elements (including ulnae and radii) of Homo neanderthalensis recovered from the site of El Sidrón (Asturias, Spain) were examined comparatively using three-dimensional geometric and traditional morphometrics. Mean centroid size and shape comparisons, principal components analysis, and phylogenetic signal analysis were undertaken...
May 2017: Journal of Human Evolution
https://www.readbyqxmd.com/read/28430719/intertrochanteric-osteotomy-for-femoral-neck-non-union-does-undercorrection-result-in-an-acceptable-rate-of-femoral-neck-union
#9
Brandon J Yuan, David W Shearer, David P Barei, Sean E Nork
OBJECTIVES: To analyze the radiographic outcomes of intertrochanteric osteotomy for the treatment of femoral neck non-union with "undercorrection" of the Pauwels' angle and relative preservation of the proximal femoral anatomy. DESIGN: Retrospective cohort study SETTING:: Level-1 trauma center PATIENTS:: Thirty-two patients with established femoral neck non-unions that had been treated with intertrochanteric osteotomy were retrospectively identified through Current Procedural Terminology (CPT) codes...
April 18, 2017: Journal of Orthopaedic Trauma
https://www.readbyqxmd.com/read/28401279/current-concepts-in-the-diagnosis-and-management-of-extra-articular-hip-impingement-syndromes
#10
REVIEW
Naoki Nakano, Grace Yip, Vikas Khanduja
PURPOSE: Extra-articular hip impingement syndromes encompass a group of conditions that have previously been an unrecognised source of pain in the hip and on occasion been associated with intra-articular hip impingement as well. As arthroscopic techniques for the hip continue to evolve, the importance of these conditions has been recognised recently and now form an important part of the differential of an individual presenting with hip pain. The aim of this article, therefore, is to provide the reader with an evidence-based and comprehensive update of these syndromes...
April 11, 2017: International Orthopaedics
https://www.readbyqxmd.com/read/28397673/-tracheotomy
#11
Marianne Kromann Nielsen, Erik Gustav Hägerström, Waldemar Trolle
The number of tracheotomies in Denmark has roughly tripled over the past 15 years. During this period, percutaneous dilatational tracheotomy has become still more common because of its easier accessibility, and it accounted for 66% of all tracheotomies in 2015 vs. 9% in 2000. However, due to the risk of fatal complications the method is only applicable when anatomical and medical conditions are favourable. Surgical tracheotomy is a safer method in some patients, and it is preferred if the patient has had a tracheostomy previously or presents with a difficult anatomy, coagulopathy or previous neck irradiation...
February 13, 2017: Ugeskrift for Laeger
https://www.readbyqxmd.com/read/28394862/the-facial-platysma-and-its-underappreciated-role-in-lower-face-dynamics-and-contour
#12
Ada R T de Almeida, Alessandra Romiti, Jean D A Carruthers
BACKGROUND: The platysma is a superficial muscle involved in important features of the aging neck. Vertical bands, horizontal lines, and loss of lower face contour are effectively treated with botulinum toxin A (BoNT-A). However, its pars facialis, mandibularis, and modiolaris have been underappreciated. OBJECTIVE: To demonstrate the role of BoNT-A treatment of the upper platysma and its impact on lower face dynamics and contour. MATERIAL AND METHODS: Retrospective analysis of cases treated by an injection pattern encompassing the facial platysma components, aiming to block the lower face as a whole complex...
April 6, 2017: Dermatologic Surgery: Official Publication for American Society for Dermatologic Surgery [et Al.]
https://www.readbyqxmd.com/read/28390913/could-preoperative-neck-anatomy-influence-follow-up-of-evar
#13
A Giménez-Gaibar, E González-Cañas, T Solanich-Valldaura, C Herranz-Pinilla, S Rioja-Artal, E Ferraz-Huguet
OBJECTIVE: Assess the clinical utility of strict CT-scan surveillance at 1, 6, 12 and 24 months after endovascular abdominal aneurysm repair (EVAR). Consider whether the anatomy of abdominal aortic aneurysm (AAA) neck (favourable/hostile) requires more imaging control. METHODS: Retrospective study 2006-2013. AAA patients who underwent EVAR with aortobiiliac endoprostheses. EXCLUSION CRITERIA: Other types of devices, hybrid techniques, open surgery...
April 5, 2017: Annals of Vascular Surgery
https://www.readbyqxmd.com/read/28390531/pet-mr-imaging-in-head-and-neck
#14
REVIEW
Yueh Z Lee, Joana Ramalho, Brice Kessler
Head and neck cancers are a diverse group of cancers with high morbidity and mortality within an area of complex anatomy. High-quality anatomic and functional imaging is essential for preoperative, chemotherapeutic, and radiotherapy planning. Early studies show that hybrid PET-MR imaging offers great potential for improving the imaging of head and neck cancers. Furthermore, advanced MR imaging techniques may also be incorporated to further enhance the diagnostic value of the combined modality.
May 2017: Magnetic Resonance Imaging Clinics of North America
https://www.readbyqxmd.com/read/28387038/insights-into-the-functional-anatomy-behind-the-preempt-injection-paradigm-guidance-on-achieving-optimal-outcomes
#15
Andrew M Blumenfeld, Stephen D Silberstein, David W Dodick, Sheena K Aurora, Mitchell F Brin, William J Binder
OBJECTIVE: To provide clinically relevant insights on the identification of the muscles and techniques involved in the safe and effective use of onabotulinumtoxinA for chronic migraine prophylaxis. BACKGROUND: Although guidance on the use of onabotulinumtoxinA for chronic migraine is available, based on the Phase III Research Evaluating Migraine Prophylaxis Therapy (PREEMPT) clinical program, clinical experience has shown that insufficient understanding of the anatomy and function of the head and neck muscles may lead to undesirable outcomes and suboptimal efficacy...
April 6, 2017: Headache
https://www.readbyqxmd.com/read/28384847/variation-in-the-branching-pattern-of-third-part-of-axillary-artery-a-case-report
#16
Aritra Banerjee, Chiman Kumari, Saroj Kaler Jhajhria
Anatomical variation of the branching pattern of axillary artery is very common. The knowledge of this variation is often useful during different surgical and interventional procedures. Variations include typically of Lateral Thoracic Artery (LTA) and Posterior Circumflex Humeral Artery (PCHA). The present case has been reported to document the variation of LTA and PCHA. The axilla of a 65-year-old embalmed female cadaver was routinely dissected for educational purpose in the Department of Anatomy, AIIMS, New Delhi, India...
February 2017: Journal of Clinical and Diagnostic Research: JCDR
https://www.readbyqxmd.com/read/28379908/effects-of-long-term-high-load-exercise-on-the-anatomy-of-the-hip-joints-a-preliminary-report
#17
Yawei Song, Xiyuan Zhang, Ke Rong
The aim of this study was to assess the impact of different sports on hip joint anatomic parameters in athletes. This was a cross-sectional study of eight male trampolinists, eight male weightlifters, and eight male volunteers enrolled in July 2014. Hip joint anatomic parameters were measured from plain radiographs taken at the level of the lesser trochanter center. Data were compared between groups using the χ-test or one-way analysis of variance with the Bonferroni post-hoc test. There were no significant differences among groups in age, height, or weight...
April 4, 2017: Journal of Pediatric Orthopedics. Part B
https://www.readbyqxmd.com/read/28378185/cervico-mental-angle-suspensory-ligament-the-keystone-to-understand-the-cervico-mental-angle-and-the-ageing-process-of-the-neck
#18
Daniel Labbé, Cynthia Souza Martins Rocha, Franklin de Souza Rocha
The authors performed cadaveric dissections to investigate the existence of an anatomical structure creating and maintaining the cervical mental angle, aiming to understand the anatomical bases of the cervico-mental angle and its modifications over time. Six fresh cadaver dissections were performed; four were done in the Caen University anatomy laboratory one in Paris XV University and one in the Coventry University hospital, England. At the end of this investigation, the authors were able to demonstrate the existence of an anatomical structure in the neck, the cervico-mental angle suspensory ligament...
April 4, 2017: Aesthetic Plastic Surgery
https://www.readbyqxmd.com/read/28377592/bonobo-anatomy-reveals-stasis-and-mosaicism-in-chimpanzee-evolution-and-supports-bonobos-as-the-most-appropriate-extant-mode%C3%AF-l-for-the-common-ancestor-of-chimpanzees-and-humans
#19
Rui Diogo, Julia L Molnar, Bernard Wood
Common chimps and bonobos are our closest living relatives but almost nothing is known about bonobo internal anatomy. We present the first phylogenetic analysis to include musculoskeletal data obtained from a recent dissection of bonobos. Notably, chimpanzees, and in particular bonobos, provide a remarkable case of evolutionary stasis for since the chimpanzee-human split c.8 Ma among >120 head-neck (HN) and forelimb (FL) muscles there were only four minor changes in the chimpanzee clade, and all were reversions to the ancestral condition...
April 4, 2017: Scientific Reports
https://www.readbyqxmd.com/read/28375913/bell-s-palsy
#20
Stephen G Reich
PURPOSE OF REVIEW: Bell's palsy is a common outpatient problem, and while the diagnosis is usually straightforward, a number of diagnostic pitfalls can occur, and a lengthy differential diagnosis exists. Recognition and management of Bell's palsy relies on knowledge of the anatomy and function of the various motor and nonmotor components of the facial nerve. Avoiding diagnostic pitfalls relies on recognizing red flags or features atypical for Bell's palsy, suggesting an alternative cause of peripheral facial palsy...
April 2017: Continuum: Lifelong Learning in Neurology
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