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https://www.readbyqxmd.com/read/28749375/towards-fast-online-intrafraction-replanning-for-free-breathing-stereotactic-body-radiation-therapy-with-the-mr-linac
#1
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/28740912/effect-of-variations-in-atelectasis-on-tumor-displacement-during-radiation-therapy-for-locally-advanced-lung-cancer
#2
Nathan Tennyson, Elisabeth Weiss, William Sleeman, Mihaela Rosu, Nuzhat Jan, Geoffrey D Hugo
PURPOSE: Atelectasis (AT), or collapsed lung, is frequently associated with central lung tumors. We investigated the variation of atelectasis volumes during radiation therapy and analyzed the effect of AT volume changes on the reproducibility of the primary tumor (PT) position. METHODS AND MATERIALS: Twelve patients with lung cancer who had AT and 10 patients without AT underwent repeated 4-dimensional fan beam computed tomography (CT) scans during radiation therapy per protocols that were approved by the institutional review board...
January 2017: Advances in Radiation Oncology
https://www.readbyqxmd.com/read/28734647/rare-root-canal-configuration-of-mandibular-second-premolar-using-cone-beam-computed-tomographic-scanning
#3
Jamie Ring, Karla C Ring
The aim of this case report was to demonstrate how the use of cone-beam computed tomographic (CBCT) imagery is beneficial when treating a tooth with an unusual anatomic variation. A 43-year-old female patient presented to our private practice after a referral from her general dentist. Endodontic therapy was previously initiated and unable to be completed because of suspicious anatomic anatomy. CBCT imagery confirmed the presence of a C-shaped root configuration and 3 canals within the tooth. Root canal treatment was completed successfully without complications...
July 19, 2017: Journal of Endodontics
https://www.readbyqxmd.com/read/28732595/probabilistic-modeling-of-anatomical-variability-using-a-low-dimensional-parameterization-of-diffeomorphisms
#4
Miaomiao Zhang, William M Wells, Polina Golland
We present an efficient probabilistic model of anatomical variability in a linear space of initial velocities of diffeomorphic transformations and demonstrate its benefits in clinical studies of brain anatomy. To overcome the computational challenges of the high dimensional deformation-based descriptors, we develop a latent variable model for principal geodesic analysis (PGA) based on a low dimensional shape descriptor that effectively captures the intrinsic variability in a population. We define a novel shape prior that explicitly represents principal modes as a multivariate complex Gaussian distribution on the initial velocities in a bandlimited space...
July 8, 2017: Medical Image Analysis
https://www.readbyqxmd.com/read/28728467/a-potential-therapeutic-pitfall-in-the-treatment-of-venous-reflux-due-to-variant-planar-anatomy-of-varicose-segments
#5
Sinan Deniz, Derya Tureli, Burcu Akpinar, Levent Oguzkurt
Purpose To elaborate on a planar anatomic variant of great saphenous vein as a potential therapeutic pitfall in the treatment of venous reflux. Materials and methods Lower extremity veins in 568 limbs with great saphenous vein insufficiency were sonographically mapped. A rather overlooked variation, the saphenous bow, was studied with emphasis on anatomic clarification and its involvement in venous insufficiency. Results This variation, observed in 5.1% (n = 29) of limbs, comprised two segments; one uninterrupted great saphenous vein proper coursing throughout saphenous compartment and one extra-compartmental segment originating distally from and proximally fusing with it...
January 1, 2017: Phlebology
https://www.readbyqxmd.com/read/28726684/low-dose-4d-cone-beam-ct-via-joint-spatiotemporal-regularization-of-tensor-framelet-and-nonlocal-total-variation
#6
Hao Han, Hao Gao, Lei Xing
Excessive radiation exposure is still a major concern in 4D cone-beam computed tomography (4D-CBCT) due to its prolonged scanning duration. Radiation dose can be effectively reduced by either under-sampling the x-ray projections or reducing the x-ray flux. However, 4D-CBCT reconstruction under such low-dose protocols is prone to image artifacts and noise. In this work, we propose a novel joint regularization-based iterative reconstruction method for low-dose 4D-CBCT. To tackle the under-sampling problem, we employ spatiotemporal tensor framelet (STF) regularization to take advantage of the spatiotemporal coherence of the patient anatomy in 4D images...
July 20, 2017: Physics in Medicine and Biology
https://www.readbyqxmd.com/read/28726308/the-collateral-venous-system-in-late-pregnancy-a-systematic-review-of-the-literature
#7
REVIEW
Aimee Humphries, Peter Stone, S Ali Mirjalili
INTRODUCTION: Recent literature has reported an association between maternal supine sleep position and stillbirth during late pregnancy. In this position the gravid uterus almost completely obstructs the inferior vena cava. A small number of women experience supine hypotension, thought to be due in part to inadequate collateral venous circulation. The aim of this paper is to review the literature describing the anatomy of the collateral venous system and in particular the azygos system, the abdominal portion of which has not been well studied...
July 20, 2017: Clinical Anatomy
https://www.readbyqxmd.com/read/28725918/a-comprehensive-review-of-motor-innervation-of-the-hand-variations-and-clinical-significance
#8
REVIEW
Sacha Wynter, Lakal Dissabandara
PURPOSE: The objective of the present review is to assemble the recognized anatomical variations, classifications, and clinical evidence with regard to innervation of the hand and discuss the clinical significance of these variations. METHODS: The material for this review was obtained by exploring PubMed and Google Scholar (search terms: hand innervation, variations of ulnar nerve, variations of median nerve, variations of radial nerve) as well as from standard anatomy texts...
July 19, 2017: Surgical and Radiologic Anatomy: SRA
https://www.readbyqxmd.com/read/28722002/report-of-occurrence-and-endodontic-management-of-three-rooted-maxillary-first-and-second-premolars-in-the-same-individual
#9
Kothandaraman Sathyanarayanan, Manali Ramakrishnan Srinivasan, Sundaresan Balagopal, Lingeswaran Poornima
Anatomical variations should be kept in mind in clinical and carefully looked for in radiographic evaluation during endodontic treatment of maxillary premolars. These teeth have highly variable root canal morphology. Although three separate roots in the maxillary first premolars have been reported, it is a rarity to find both the first and second premolars possessing three separate roots. This case report describes the diagnosis and endodontic management of maxillary first and second premolars with three canals and three separate roots...
May 2017: Indian Journal of Dental Research: Official Publication of Indian Society for Dental Research
https://www.readbyqxmd.com/read/28720406/mri-anatomical-preoperative-evaluation-of-distally-based-peroneus-brevis-muscle-flap-in-reconstructive-surgery-of-the-lower-limb
#10
Federico Barbera, Fulvio Lorenzetti, Ricccardo Marsili, Matteo Ragoni, Andrea Lisa, Virna Zampa, Marcello Pantaloni
BACKGROUND: The distally based peroneus brevis muscle flap has proved to be a simple solution for small- to moderate-sized wounds of the lower limb. The length of the muscle belly suitable for coverage is a crucial parameter. In this study, we evaluated the capability of 3D MRI of the lower limb to measure it preoperatively. METHODS: Between 2008 and 2017, 32 patients with lower limb defects underwent preoperative MRI to measure the peroneus brevis muscle length...
June 27, 2017: Journal of Plastic, Reconstructive & Aesthetic Surgery: JPRAS
https://www.readbyqxmd.com/read/28713632/radiographic-assessment-of-the-presigmoid-retrolabyrinthine-approach
#11
Andrew K Wong, Melissa M Stamates, Anita P Bhansali, Michael Shinners, Ricky H Wong
BACKGROUND: Lesions of the petroclival fissure are difficult to access surgically. Both retrosigmoid and presigmoid retrolabyrinthine approaches have been described to successfully treat these complex tumors. The retrosigmoid approach offers quick and familiar access, whereas the presigmoid retrolabyrinthine approach reduces the operative distance and the need for cerebellar retraction. The presigmoid retrolabyrinthine approach, however, is constrained by anatomical limits that can be subject to patient variation...
2017: Surgical Neurology International
https://www.readbyqxmd.com/read/28712895/parent-and-child-balloon-technique-for-navigating-guide-catheters-during-neurointerventions
#12
Tomotaka Ohshima, Kojiro Ishikawa, Shunsaku Goto, Taiki Yamamoto
BACKGROUND: and Purpose: The stabilization of a guide catheter is an important factor for performing successful neurointerventional procedures. We present our technique for navigating guide catheters using parent and child balloons. MATERIALS AND METHODS: In nine patients with severe atherosclerosis or anatomical variations such as a bovine arch, 8-9-F balloon-mounted guide catheters were navigated using balloon-attached guidewires. Both balloons were complementarily used for flow navigation and vessel fixation at the appropriate portions and times...
July 13, 2017: World Neurosurgery
https://www.readbyqxmd.com/read/28706811/surgical-technique-for-arthroscopy-assisted-anatomical-reconstruction-of-acromioclavicular-and-coracoclavicular-ligaments-using-autologous-hamstring-graft-in-chronic-acromioclavicular-joint-dislocations
#13
Bancha Chernchujit, Prashant Parate
Injuries to the acromioclavicular (AC) joint are becoming common with contact sports and bike accidents. It is well known that in AC dislocations, the first structure to fail is the AC capsule followed by the trapezoid and conoid ligaments. The function of these ligaments must be restored to restore the anatomy and physiology of the AC joint to get the best results. Until now, no technique has emerged as the gold standard for restoration of the AC joint anatomy and function. In our technique, the stress is on recreating the anatomy to make it more individualized based on individual variations...
June 2017: Arthroscopy Techniques
https://www.readbyqxmd.com/read/28706589/catheter-ablation-of-atrial-fibrillation-facilitated-by-preprocedural-three-dimensional-transesophageal-echocardiography-long-term-outcome
#14
Klaus Kettering, Felix Gramley, Stephan von Bardeleben
AIM: To evaluate the long-term outcome of catheter ablation of atrial fibrillation (AF) facilitated by preprocedural three-dimensional (3-D) transesophageal echocardiography. METHODS: In 50 patients, 3D transesophageal echocardiography (3D TEE) was performed immediately prior to an ablation procedure (paroxysmal AF: 30 patients, persistent AF: 20 patients). The images were available throughout the ablation procedure. Two different ablation strategies were used. In most of the patients with paroxysmal AF, the cryoablation technique was used (Arctic Front Balloon, CryoCath Technologies/Medtronic; group A2)...
June 26, 2017: World Journal of Cardiology
https://www.readbyqxmd.com/read/28688203/assessment-of-colorectal-length-using-the-electromagnetic-capsule-tracking-system-a-comparative-validation-study-in-healthy-subjects
#15
E B Mark, J L Poulsen, A M Haase, J B Frøkjaer, V Schlageter, S M Scott, K Krogh, A M Drewes
AIM: We aimed to determine colorectal length with the 3D-Transit system by describing a 'centerline' of capsule movement and compare it to known anatomy, as determined by magnetic resonance imaging (MRI). Further, we aimed to test the day-to-day variation of colorectal length assessed with the system. METHOD: The 3D-Transit system consists of electromagnetic capsules that can be tracked as they traverse the gastrointestinal tract. 25 healthy subjects were examined with both 3D-Transit and MRI...
July 8, 2017: Colorectal Disease: the Official Journal of the Association of Coloproctology of Great Britain and Ireland
https://www.readbyqxmd.com/read/28686631/a-new-approach-for-the-analysis-of-facial-growth-and-age-estimation-iris-ratio
#16
Carlos Eduardo Palhares Machado, Marta Regina Pinheiro Flores, Laíse Nascimento Correia Lima, Rachel Lima Ribeiro Tinoco, Ademir Franco, Ana Cristina Barreto Bezerra, Martin Paul Evison, Marco Aurélio Guimarães
The study of facial growth is explored in many fields of science, including anatomy, genetics, and forensics. In the field of forensics, it acts as a valuable tool for combating child pornography. The present research proposes a new method, based on relative measurements and fixed references of the human face-specifically considering measurements of the diameter of the iris (iris ratio)-for the analysis of facial growth in association with age in children and sub-adults. The experimental sample consisted of digital photographs of 1000 Brazilian subjects, aged between 6 and 22 years, distributed equally by sex and divided into five specific age groups (6, 10, 14, 18, and 22 year olds ± one month)...
2017: PloS One
https://www.readbyqxmd.com/read/28681754/microsurgical-anatomy-of-the-superior-sagittal-sinus-and-draining-veins
#17
Mariano Anto Bruno-Mascarenhas, Vengalathur G Ramesh, Sundar Venkatraman, Jolarpettai V Mahendran, S Sundaram
BACKGROUND: The superior sagittal sinus and the draining cerebral veins are often encountered during the surgery for parasagittal and falx meningiomas and during the interhemisperic transcallosal approaches. A knowledge about the variations from the normally described anatomy helps in anticipating and avoiding problems related to these structures during surgery. AIM: The normal variations in the disposition of the superior sagittal sinus and the number and direction of the draining veins in the Indian population have been studied...
July 2017: Neurology India
https://www.readbyqxmd.com/read/28681490/a-novel-method-for-observation-of-the-mandibular-foramen-application-to-a-better-understanding-of-dental-anatomy
#18
Joe Iwanaga, Koichi Watanabe, Tsuyoshi Saga, R Shane Tubbs, Kengo Tanaka, Shogo Kikuta, Yoko Tabira, Chistian Fisahn, Yasuhiko Kamura, Jingo Kusukawa, Koh-Ichi Yamaki
INTRODUCTION: Cone-beam computed tomography gives us much useful morphological information about the mandibular bone. Many studies of the mandible include findings from this technique. However, there have been no endoscopic studies of the mandible. MATERIALS AND METHODS: Sixteen sides of eight dry mandibles resected from cadavers (age range 38-83 years) were examined by endoscopy. The head of the endoscope was 2.0 mm in diameter. We examined the mandibular foramen, lingula, mylohyoid groove and mandibular canal...
July 6, 2017: Anatomical Record: Advances in Integrative Anatomy and Evolutionary Biology
https://www.readbyqxmd.com/read/28681461/the-role-of-the-primitive-lateral-basilovertebral-anastomosis-of-padget-in-variations-of-the-vertebrobasilar-arterial-system
#19
Lydia Gregg, Philippe Gailloud
PURPOSE: The primitive lateral basilovertebral anastomosis (PLBA) is an embryonic longitudinal anastomotic channel that transiently interconnects the developing branches of the vertebrobasilar system. This study reviews the anatomy of the PLBA and describes several variants associated with its partial persistence. METHODS: Four types of vertebrobasilar anomalies linked to the PLBA are illustrated by 13 angiographic observations. RESULTS: The angiographic appearances of (i) typical and atypical persistent trigeminal artery variants, (ii) common trunks of origin for one, two or three cerebellar arteries, (iii) aberrant origins of the cerebellar arteries, and (iv) vertebrobasilar duplications are described...
July 6, 2017: Anatomical Record: Advances in Integrative Anatomy and Evolutionary Biology
https://www.readbyqxmd.com/read/28677632/ultrasonographic-diagnosis-of-thoracic-outlet-syndrome-secondary-to-brachial-plexus-piercing-variation
#20
Vanessa Leonhard, Gregory Caldwell, Mei Goh, Sean Reeder, Heather F Smith
Structural variations of the thoracic outlet create a unique risk for neurogenic thoracic outlet syndrome (nTOS) that is difficult to diagnose clinically. Common anatomical variations in brachial plexus (BP) branching were recently discovered in which portions of the proximal plexus pierce the anterior scalene. This results in possible impingement of BP nerves within the muscle belly and, therefore, predisposition for nTOS. We hypothesized that some cases of disputed nTOS result from these BP branching variants...
July 4, 2017: Diagnostics
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