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https://www.readbyqxmd.com/read/28750134/performance-evaluation-of-a-collapsed-cone-dose-calculation-algorithm-for-hdr-ir-192-of-apbi-treatments
#1
Dario Terribilini, Veronika Vitzthum, Werner Volken, Daniel Frei, Kristina Loessl, Bob van Veelen, Peter Manser, Michael K Fix
PURPOSE: Most dose calculations for HDR brachytherapy treatments are based on the AAPM-TG43 formalism. Because patient's anatomy, heterogeneities and applicator shielding are not considered, the dose calculation based on this formalism is inaccurate in some cases. Alternatively, Collapsed Cone (CC) methods as well as Monte Carlo (MC) algorithms belong to the model based dose calculation algorithms, which are expected to improve the accuracy of calculated dose distributions. In this work, the performance of a CC algorithm, ACE in Oncentra Brachy 4...
July 27, 2017: Medical Physics
https://www.readbyqxmd.com/read/28749895/mechanical-modeling-of-a-keratoconic-cornea
#2
Jean Marc Perone, Jean Baptiste Conart, Pierre-Jean Bertaux, Nicolas Sujet-Perone, Nadia Ouamara, Maxime Sot, Jean Jacques Henry
PURPOSE: We created a laboratory model of a cornea that was subjected to various pressures and thermal and mechanical factors to better understand the genesis of keratoconus deformation. METHODS: A steel base allowed for fixation of circular multilaminated patches of araldite (10 cm in diameter, 5 mm thick) in which the corneal anatomy was modeled. The model was plunged into a steam room (374°F/3 bars of pressure for 1 h) to ensure thermal homogeneity and was subjected to pressure using compressed air...
July 26, 2017: Cornea
https://www.readbyqxmd.com/read/28749850/midline-suboccipital-endoscopic-transcerebellomedullary-fissure-keyhole-approach
#3
Lin Yang, Hengzhu Zhang, Xingdong Wang, Zhengcun Yan, Lang Chen, Xiaoyan Ji, Jun Dong
OBJECTIVE: To study the endoscopic anatomy of the 4th ventricle and lateral brainstem regions via the midline suboccipital endoscopic transcerebellomedullary fissure keyhole approach assisted by a neuronavigation system and discuss the feasibility and indications of this approach. MATERIALS AND METHODS: Craniotomy procedures performed via the midline suboccipital endoscopic transcerebellomedullary fissure keyhole approach were simulated on 8 adult cadaveric heads fixed by formalin, and the related anatomic structures in the 4th ventricles or around the brainstem were observed through the 0° endoscope or alternatively 30° one...
July 26, 2017: Journal of Craniofacial Surgery
https://www.readbyqxmd.com/read/28749840/computed-tomography-research-relative-anatomy-of-caldwell-luc-approach-in-pterygopalatine-fossa-surgery
#4
Mei Chen Liu, Xiao Rui Yin, Yi Shui Zhang, Wen Yang, Han Wen Zhang, Hao Bo Duan, Jian Ming Liu, Kai Liang Cheng, You Qiong Li
With the development of endoscopic technique, Caldwell-Luc approach has more wide applications and becomes a common method of pterygopalatine fossa (PPF) surgery. Few data can be used in this approach to avoid injuring the vessels and nerves within this area. In this study, the authors used computed tomography to get the coordinates of inferior orbital fissure, foramen rotundum, sphenopalatine foramen, internal opening of pterygoid canal, the strangulation of PPF, and the greater palatine foramen with canine fossa as the origin...
July 26, 2017: Journal of Craniofacial Surgery
https://www.readbyqxmd.com/read/28749836/anatomic-study-of-ophthalmic-artery-embolism-following-cosmetic-injection
#5
Sufan Wu, Lei Pan, Hua Wu, Hangyan Shi, Ye Zhao, Yu Ji, Haifeng Zeng
INTRODUCTION: Cosmetic injections of dermal fillers or fat could cause ophthalmic artery embolism and even blindness, the high-risk regions of which are considered glabellar, nasal dorsum, and nasolabial fold. Understanding anatomy of the related arteries is important for a physician to safely perform filler injections. To investigate the mechanisms of ophthalmic artery embolism following the injections, cadaver anatomy was studied. METHODS: Ophthalmic artery, facial artery, their branches, and anastomoses among them were anatomized in 12 fresh cadavers...
July 26, 2017: Journal of Craniofacial Surgery
https://www.readbyqxmd.com/read/28749375/towards-fast-online-intrafraction-replanning-for-free-breathing-stereotactic-body-radiation-therapy-with-the-mr-linac
#6
Charis Kontaxis, Gijsbert H Bol, Bjorn Stemkens, Markus Glitzner, Fieke M Prins, Linda G W Kerkmeijer, Jan J W Lagendijk, Bas W Raaymakers
The hybrid MRI-radiotherapy machines, like the MR-linac (Elekta AB, Stockholm, Sweden) installed at the UMC Utrecht (Utrecht, The Netherlands), will be able to provide real-time patient imaging during treatment. In order to take advantage of the system's capabilities and enable online adaptive treatments, a new generation of software should be developed, ranging from motion estimation to treatment plan adaptation. In this work we present a proof of principle adaptive pipeline designed for high precision Stereotactic Body Radiation Therapy (SBRT) suitable for sites affected by respiratory motion, like Renal Cell Carcinoma (RCC)...
July 27, 2017: Physics in Medicine and Biology
https://www.readbyqxmd.com/read/28748256/bioresorbable-vascular-scaffolds-in-interventional-neuroradiology
#7
Anil Arat, Ergun Daglioglu, Ilkay Akmangit, Ahmet Peker, Murat Arsava, Mehmet Akif Topcuoglu, Deniz Belen
PURPOSE: Bioresorbable vascular scaffolds (BVS) have changed practice patterns in cardiology. These resorbable stents have not yet been utilized in the cerebrovascular circulation. We report the initial experiences with these devices in interventional neuroradiology. METHODS: A retrospective review of clinical presentations, imaging findings and follow-up results of all patients treated using a BVS by our neurovascular team was carried out using hospital electronic charts and the hospital radiographic archive system...
July 26, 2017: Clinical Neuroradiology
https://www.readbyqxmd.com/read/28748158/bioresorbable-vascular-scaffolds-for-complex-coronary-anatomies-icarus-flight-for-interventional-cardiologists
#8
EDITORIAL
Salvatore Cassese, Adnan Kastrati, Massimiliano Fusaro
No abstract text is available yet for this article.
June 2017: Cardiovascular Diagnosis and Therapy
https://www.readbyqxmd.com/read/28747945/the-impact-of-type-2-diabetes-mellitus-on-prognosis-in-patients-with-non-st-elevation-myocardial-infarction
#9
REVIEW
Katarzyna Birkner, Bartosz Hudzik, Mariusz Gąsior
Type 2 diabetes (T2D) is a recognized risk factor for acute coronary syndromes. There is currently no consensus concerning the intensification of antihyperglycemic treatment. According to the available guidelines, it seems that the goal is to achieve glycated hemoglobin (HbA1c) levels below 7% and avoid hypoglycemia. The choice of a revascularization method is influenced by many factors, such as the anatomy of the coronary arteries, severity of atherosclerosis, anatomical location of lesions, and presence of comorbidities...
June 2017: Kardiochirurgia i Torakochirurgia Polska, Polish Journal of Cardio-Thoracic Surgery
https://www.readbyqxmd.com/read/28746289/management-of-scaphoid-fractures
#10
Jason H Ko, Mitchell A Pet, Joseph S Khouri, Warren C Hammert
LEARNING OBJECTIVES: After reading this article, the participant should be able to: 1. Understand the epidemiology, classification, and anatomy pertinent to the scaphoid. 2. Appropriately evaluate a patient with suspected scaphoid fracture, including appropriate imaging. 3. Understand the indications for operative treatment of scaphoid fractures, and be familiar with the various surgical approaches. 4. Describe the treatment options for scaphoid nonunion and avascular necrosis of the proximal pole...
August 2017: Plastic and Reconstructive Surgery
https://www.readbyqxmd.com/read/28746271/facial-assessment-and-injection-guide-for-botulinum-toxin-and-injectable-hyaluronic-acid-fillers-focus-on-the-upper-face
#11
Maurício de Maio, Arthur Swift, Massimo Signorini, Steven Fagien
Techniques for the administration of injectable fillers and neuromodulators for facial aesthetic rejuvenation and enhancement continue to evolve. As the number of physicians with limited experience in providing aesthetic treatments expands, the need for guidance and training from more experienced injectors has become apparent. The use of a slow, careful, and methodical injection technique is imperative in all treatment settings and for all facial areas. Constant attention to local anatomy, particularly arteries, veins, and nerve bundles, is critical for minimizing complications...
August 2017: Plastic and Reconstructive Surgery
https://www.readbyqxmd.com/read/28746270/facial-nerve-supply-to-the-orbicularis-oculi-around-the-lower-eyelid-anatomy-and-its-clinical-implications
#12
Yeop Choi, Hyun Gu Kang, Yong Seok Nam, Jae-Goo Kang, In-Beom Kim
BACKGROUND: The motor innervation of the lower orbicularis oculi has not been clearly established. There is a discrepancy between anatomical descriptions and clinical outcomes of the motor innervation of the pretarsal orbicularis oculi muscle. Therefore, the purposes of this study were to identify every motor and sensory nerve of the lower eyelid, and to reveal the detailed motor nerve pathways toward the medial canthal area. METHODS: Fresh cadaver dissections were performed on 50 hemifaces under a surgical microscope...
August 2017: Plastic and Reconstructive Surgery
https://www.readbyqxmd.com/read/28746241/upper-lip-reconstruction
#13
Edward A Luce
Reconstruction of an aesthetically acceptable and functional upper lip requires a careful consideration of the transverse and vertical soft tissue, muscle and skin, deficiency. This review focuses on the reconstructive aspects of the upper lip.The functional anatomy of the upper lip is considerably complex and includes paired muscles in addition to the orbicularis, elevators of both the upper lip and commissure. The muscular action of facial expression recruits different sets of these paired muscles. Unlike the aesthetic uniform appearance of the lower lip commissure to commissure, the upper lip aesthetics can be divided into a central, the philtrum unit, and a lateral upper lip unit...
July 12, 2017: Plastic and Reconstructive Surgery
https://www.readbyqxmd.com/read/28744917/the-vocal-sac-of-hylodidae-amphibia-anura-phylogenetic-and-functional-implications-of-a-unique-morphology
#14
Agustin J Elias-Costa, Rachel Montesinos, Taran Grant, Julián Faivovich
Anuran vocal sacs are elastic chambers that recycle exhaled air during vocalizations and are present in males of most species of frogs. Most knowledge of the diversity of vocal sacs relates to external morphology; detailed information on internal anatomy is available for few groups of frogs. Frogs of the family Hylodidae, which is endemic to the Atlantic Forest of Brazil and adjacent Argentina and Paraguay, have three patterns of vocal sac morphology-that is, single, subgular; paired, lateral; and absent. The submandibular musculature and structure of the vocal sac mucosa (the internal wall of the vocal sac) of exemplar species of this family and relatives were studied...
July 25, 2017: Journal of Morphology
https://www.readbyqxmd.com/read/28744658/characteristics-of-retinal-vessels-in-surgically-closed-macular-hole-an-optical-coherence-tomography-angiography-study
#15
Cheolmin Yun, Jaemoon Ahn, Mingue Kim, Jee Taek Kim, Soon-Young Hwang, Seong-Woo Kim, Jaeryung Oh
PURPOSE: The purpose of our study was to investigate characteristics of retinal vessels in eyes with surgically closed macular holes (MH). METHODS: We included patients who underwent surgery for idiopathic MH and a follow-up examination using optical coherence tomography angiography (OCTA). The area of the foveal avascular zone (FAZ) and retinal vascular densities of the superficial capillary plexus (SCP) and deep capillary plexus (DCP) were calculated on the postoperative OCTA images and compared with those of age-matched normal controls...
July 25, 2017: Graefe's Archive for Clinical and Experimental Ophthalmology
https://www.readbyqxmd.com/read/28744292/xylem-and-leaf-functional-adjustments-to-drought-in-pinus-sylvestris-and-quercus-pyrenaica-at-their-elevational-boundary
#16
Laura Fernández-de-Uña, Sergio Rossi, Ismael Aranda, Patrick Fonti, Borja D González-González, Isabel Cañellas, Guillermo Gea-Izquierdo
Climatic scenarios for the Mediterranean region forecast increasing frequency and intensity of drought events. Consequently, a reduction in Pinus sylvestris L. distribution range is projected within the region, with this species being outcompeted at lower elevations by more drought-tolerant taxa such as Quercus pyrenaica Willd. The functional response of these species to the projected shifts in water availability will partially determine their performance and, thus, their competitive success under these changing climatic conditions...
2017: Frontiers in Plant Science
https://www.readbyqxmd.com/read/28744227/trauma-of-the-frontal-region-is-influenced-by-the-volume-of-frontal-sinuses-a-finite-element-study
#17
Srbislav S Pajic, Svetlana Antic, Arso M Vukicevic, Nenad Djordjevic, Gordana Jovicic, Zivorad Savic, Igor Saveljic, Aleksa Janović, Zoran Pesic, Marija Djuric, Nenad Filipovic
Anatomy of frontal sinuses varies individually, from differences in volume and shape to a rare case when the sinuses are absent. However, there are scarce data related to influence of these variations on impact generated fracture pattern. Therefore, the aim of this study was to analyse the influence of frontal sinus volume on the stress distribution and fracture pattern in the frontal region. The study included four representative Finite Element models of the skull. Reference model was built on the basis of computed tomography scans of a human head with normally developed frontal sinuses...
2017: Frontiers in Physiology
https://www.readbyqxmd.com/read/28744087/a-peek-into-the-future-of-radiology-using-big-data-applications
#18
Amit T Kharat, Shubham Singhal
Big data is extremely large amount of data which is available in the radiology department. Big data is identified by four Vs - Volume, Velocity, Variety, and Veracity. By applying different algorithmic tools and converting raw data to transformed data in such large datasets, there is a possibility of understanding and using radiology data for gaining new knowledge and insights. Big data analytics consists of 6Cs - Connection, Cloud, Cyber, Content, Community, and Customization. The global technological prowess and per-capita capacity to save digital information has roughly doubled every 40 months since the 1980's...
April 2017: Indian Journal of Radiology & Imaging
https://www.readbyqxmd.com/read/28744076/mr-fistulography-with-percutaneous-instillation-of-aqueous-jelly-a-cost-effective-technique-innovation
#19
Rohit Aggarwal, Brijesh K Soni, Joish U Kumar, Raju A George, Rajeev Sivasankar
BACKGROUND: Perianal fistula is a commonly encountered condition in routine surgical practice. Accurate presurgical mapping of these tracts is vital to prevent recurrence. We have assessed the effectiveness of percutaneous instillation of aqueous jelly prior to magnetic resonance (MR) fistulography. AIMS AND OBJECTIVES: To study the role of percutaneous instillation of aqueous jelly in fistulous tracts prior to MR fistulography. MATERIALS AND METHODS: All patients with active discharge, referred for MR fistulography between January 2014 and April 2016, were included in this study...
April 2017: Indian Journal of Radiology & Imaging
https://www.readbyqxmd.com/read/28744072/multimodality-imaging-spectrum-of-complications-of-horseshoe-kidney
#20
Hardik U Shah, Vijayanadh Ojili
Horseshoe kidney is the most common congenital renal fusion anomaly with an incidence of 1 in 400-600 individuals. The most common type is fusion at the lower poles seen in greater than 90% of the cases, with the rest depicting fusion at the upper poles, resulting in an inverted horseshoe kidney. Embryologically, there are two theories hypothesizing the genesis of horseshoe kidney - mechanical fusion theory and teratogenic event theory. As an entity, horseshoe kidney is an association of two anatomic anomalies, namely, ectopia and malrotation...
April 2017: Indian Journal of Radiology & Imaging
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