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https://www.readbyqxmd.com/read/29160929/anatomical-variations-of-the-human-cochlea-determined-from-micro-ct-and-high-resolution-ct-imaging-and-reconstruction
#1
Jie Tang, Xianglong Tang, Zhenhua Li, YiKang Liu, SongHua Tan, Heng Li, RongDan Ke, Zhi Wang, Li Gong, AnZhou Tang
Understanding the anatomical variations in the human cochlea are important for cochlear implants. This study examined these variations using a reconstructed fusion model of the skull and temporal bone. The 3D digital model of the temporal bone was reconstructed from multiple axial micro-CT scans of temporal bone and high resolution CT (HRCT) of the skull from 15 cadavers. A skull model was reconstructed and merged with the reconstructed temporal bone. The 3D relationship between the cochlea and the skull's mid-sagittal plane was analyzed...
November 21, 2017: Anatomical Record: Advances in Integrative Anatomy and Evolutionary Biology
https://www.readbyqxmd.com/read/29160399/marginal-and-internal-adaptation-of-zirconia-crowns-a-comparative-study-of-assessment-methods
#2
Rafael Schlögel Cunali, Rafaella Caramori Saab, Gisele Maria Correr, Leonardo Fernandes da Cunha, Bárbara Pick Ornaghi, André V Ritter, Carla Castiglia Gonzaga
Marginal and internal adaptation is critical for the success of indirect restorations. New imaging systems make it possible to evaluate these parameters with precision and non-destructively. This study evaluated the marginal and internal adaptation of zirconia copings fabricated with two different systems using both silicone replica and microcomputed tomography (micro-CT) assessment methods. A metal master model, representing a preparation for an all-ceramic full crown, was digitally scanned and polycrystalline zirconia copings were fabricated with either Ceramill Zi (Amann-Girrbach) or inCoris Zi (Dentslpy-Sirona), n=10...
July 2017: Brazilian Dental Journal
https://www.readbyqxmd.com/read/29160397/mechanical-preparation-showed-superior-shaping-ability-than-manual-technique-in-primary-molars-a-micro-computed-tomography-study
#3
Lídia Regina da Costa Hidalgo, Léa Assed Bezerra da Silva, Graziela Bianchi Leoni, Jardel Francisco Mazzi-Chaves, Emily Eduardo da Silva Carvalho, Alberto Consolaro, Manoel Damião Sousa-Neto
The aim of the study was to evaluate canal preparation in primary molars with hand files, ProTaper Next and Self-Adjusting File (SAF) by 2D and 3D micro-computed tomography (micro-CT) analysis. Canals of 24 primary molars were prepared with hand files (HF), ProTaper Next (PTN) and SAF (n=8/group). The teeth were scanned before and after root canal preparation and the pre- and postoperative micro-CT images were reconstructed. Changes in 2D (area, perimeter, roundness, minor and major diameter) and 3D [volume, surface area, structure model index (SMI)] morphological parameters, as well as canal transportation and lateral perforations were evaluated (Kruskal-Wallis and ANOVA; a=0...
July 2017: Brazilian Dental Journal
https://www.readbyqxmd.com/read/29160142/structural-fat-grafting-to-improve-outcomes-of-vocal-folds-fat-augmentation-long-term-results
#4
Giovanna Cantarella, Riccardo F Mazzola, Michele Gaffuri, Elisabetta Iofrida, Pietro Biondetti, Laura V Forzenigo, Lorenzo Pignataro, Sara Torretta
Objective Evaluating the long-term outcomes of vocal fold structural fat grafting. Study Design Case series with chart review. Setting University hospital. Subjects and Methods Seventy-nine dysphonic patients (16-82 years; 55 with unilateral laryngeal paralysis and 24 with vocal fold scarring) underwent vocal fold fat injection. Fat was harvested by low-pressure liposuction and then processed by centrifugation. Refined fat aliquots were placed in the vocal fold and paraglottic space in multiple tunnels to enhance graft neovascularization...
November 1, 2017: Otolaryngology—Head and Neck Surgery
https://www.readbyqxmd.com/read/29160113/superficial-siderosis-of-central-nervous-system-with-unknown-cause-report-of-2-cases-and-review-of-the-literature
#5
Hao Chen, Hafiz Khuram Raza, Jia Jing, Xinchun Ye, Zuohui Zhang, Fang Hua, Guiyun Cui
OBJECTIVE: To report 2 cases of superficial siderosis of central nervous system (SS-CNS) and a review of the literature. METHODS: We have analyzed the clinical data and relevant features of two patients with SS-CNS who were presented with ataxia and slurred speech. Both patients undertook blood tests, lumbar puncture, head CT (computer tomography) scans, and brain and spinal cord magnetic resonance (MR) scans. In addition, the first patient also undewent enhanced susceptibility-weighted angiography (ESWAN) and the second patient undertook susceptibility weighted imaging (SWI) scan...
November 21, 2017: British Journal of Neurosurgery
https://www.readbyqxmd.com/read/29160005/investigation-of-parameters-predicting-the-need-for-diagnostic-imaging-beyond-computed-tomography-in-the-evaluation-of-dogs-with-thoracolumbar-myelopathy-retrospective-evaluation-of-555-dogs
#6
Lee Emery, Silke Hecht, Xiaocun Sun
Thoracolumbar myelopathy encompasses a number of disease processes such as intervertebral disc disease, discospondylitis, trauma, congenital malformations, neoplasia, and intramedullary spinal cord disease. Compressive disc herniations are most common in dogs and require imaging procedures such as myelography, computed tomography (CT), and/or magnetic resonance imaging (MRI) to determine the need and location for decompressive surgery. The purposes of this retrospective, cross-sectional study were to evaluate all dogs undergoing thoracolumbar CT imaging as the initial diagnostic step between 2010 and 2015 and determine whether any of the imaging characteristics could be used to predict the need for additional imaging in the form of myelography, CT myelography, and/or MRI...
November 20, 2017: Veterinary Radiology & Ultrasound
https://www.readbyqxmd.com/read/29159958/evaluation-of-a-low-risk-mild-traumatic-brain-injury-and-intracranial-hemorrhage-emergency-department-observation-protocol
#7
Brian J Yun, Pierre Borczuk, Lulu Wang, Stephen Dorner, Benjamin A White, Ali S Raja
OBJECTIVES: Among emergency physicians, there is wide variation in admitting practices for patients who suffered a mild traumatic brain injury (TBI) with an intracranial hemorrhage (ICH). The purpose of this study was to evaluate the effects of implementing a protocol in the emergency department (ED) observation unit for patients with mild TBI and ICH. METHODS: This retrospective cohort study was approved by the Institutional Review Board. Study subjects were patients ≥18 years of age with an International Classification of Diseases (ICD) code corresponding to a traumatic IC, and admitted to an ED observation unit (EDOU) of an urban, academic level 1 trauma center between February 1, 2015 and January 31, 2017...
November 20, 2017: Academic Emergency Medicine: Official Journal of the Society for Academic Emergency Medicine
https://www.readbyqxmd.com/read/29159925/the-use-of-micro-ct-imaging-to-examine-and-illustrate-fetal-skeletal-abnormalities-in-dutch-belted-rabbits-and-to-prove-concordance-with-alizarin-red-stained-skeletal-examination
#8
Howard M Solomon, Stacia Murzyn, Joyce Rendemonti, Sharon Chapman, Tinamarie Skedzielewski, Beat M Jucker, Dinesh Stanislaus, Hasan Alsaid
OBJECTIVES: In our laboratory we evaluated the use of micro-computed tomography (micro-CT) using a high resolution acquisition protocol and fetuses obtained on Gestation Day (GD) 29 (mating = GD 0). METHODS: To show concordance between traditional Alizarin Red S stain and micro-CT skeletal examination methods, 103 fetuses from 19 untreated Dutch belted rabbits were obtained by cesarean section and stored frozen. The fetuses were thawed, imaged and examined digitally by micro-CT, then stained and re-examined using traditional methods...
November 21, 2017: Birth defects research
https://www.readbyqxmd.com/read/29159012/robust-planning-for-a-patient-treated-in-decubitus-position-with-proton-pencil-beam-scanning-radiotherapy
#9
Shikui Tang, Limin Song, Jared D Sturgeon, Chang Chang
A challenging case was reported for a patient treated in decubitus position with proton pencil beam scanning. A regular robust plan with the consideration of the uncertainties of translational alignment and range accuracy cannot ensure the target coverage as revealed in two verification computed tomography (CT) scans during the first week of the treatment. The irreproducibility of daily alignment and anatomical variations in such a position is mainly due to patient's roll. To mitigate the interfractional effect on the target coverage, a novel robust optimization against the patient's angular setup uncertainties was implemented to improve the plan quality by introducing two artificial CT image sets by rolling the planning CT three degrees in both clockwise and counter-clockwise directions and adding them into robust optimization scenarios, which was shown to be an effective and simple way to mitigate target dose degradation with respect to interfractional variations...
September 20, 2017: Curēus
https://www.readbyqxmd.com/read/29158067/psoas-muscle-area-as-a-prognostic-factor-for-survival-in-patients-with-an-asymptomatic-infrarenal-abdominal-aortic-aneurysm-a-retrospective-cohort-study
#10
Reza Indrakusuma, Jendé L Zijlmans, Hamid Jalalzadeh, R Nils Planken, Ron Balm, Mark J W Koelemay
OBJECTIVES: Loss of muscle mass has been associated with poor survival in several surgical patient populations, including those with an abdominal aortic aneurysm (AAA). We wanted to replicate these findings and assesse the association between psoas muscle area (PMA) and survival in patients with an asymptomatic AAA. METHODS: Patients with an asymptomatic infrarenal AAA who underwent computed tomography (CT) scanning between January 1, 2007, and December 31, 2013, were included in this single-centre retrospective cohort study...
November 17, 2017: European Journal of Vascular and Endovascular Surgery
https://www.readbyqxmd.com/read/29157265/the-impact-of-dual-energy-ct-imaging-on-dose-calculations-for-pre-clinical-studies
#11
Ana Vaniqui, Lotte E J R Schyns, Isabel P Almeida, Brent van der Heyden, Stefan J van Hoof, Frank Verhaegen
BACKGROUND: To investigate the feasibility of using dual-energy CT (DECT) for tissue segmentation and kilovolt (kV) dose calculations in pre-clinical studies and assess potential dose calculation accuracy gain. METHODS: Two phantoms and an ex-vivo mouse were scanned in a small animal irradiator with two distinct energies. Tissue segmentation was performed with the single-energy CT (SECT) and DECT methods. A number of different material maps was used. Dose calculations were performed to verify the impact of segmentations on the dose accuracy...
November 21, 2017: Radiation Oncology
https://www.readbyqxmd.com/read/29155309/prognostic-utility-of-total-68-ga-dotatate-avid-tumor-volume-in-patients-with-neuroendocrine-tumors
#12
Amit Tirosh, Georgios Z Papadakis, Corina Millo, Dima Hammoud, Samira M Sadowski, Peter Herscovitch, Karel Pacak, Stephen J Marx, Lily Yang, Pavel Nockel, Jasmine Shell, Patience Green, Xavier M Keutgen, Dhaval Patel, Naris Nilubol, Electron Kebebew
BACKGROUND & AIMS: Survival times vary among patients with neuroendocrine tumors (NETs)-even among those with the same site, stage, and grade of primary tumor. This makes it difficult to select treatment for patients with unresectable NETs, because some patients can survive decades without treatment. (68)Gallium-DOTATATE positron emission tomography with computed tomography ((68)Ga-DOTATATE PET/CT) is a sensitive imaging technique for detection of NETs. We investigated the prognostic accuracy of (68)Ga-DOTATATE PET/CT analysis of tumor volume in patients with NETs...
November 16, 2017: Gastroenterology
https://www.readbyqxmd.com/read/29155115/transtentorial-distortion-syndrome-a-consistent-complication-following-lateral-and-fourth-ventricular-shunting-in-adults
#13
Claudia L Craven, Irene Baudracco, Simon D Thompson, Lewis Thorne, Laurence D Watkins, Ahmed K Toma
BACKGROUND: Complex hydrocephalus affecting lateral and fourth ventricles separately is occasionally managed with CSF diversion via supra- and infra-tentorial ventricular catheters. The optimal configuration to reduce complications is currently unknown in adults. We describe a consistently similar clinical presentation of patients with complex hydrocephalus and a fourth ventricle separately drained by infra-tentorial shunt insertion. METHODS: A retrospective single centre case series...
November 15, 2017: World Neurosurgery
https://www.readbyqxmd.com/read/29154725/non-aneurysmal-subarachnoid-hemorrhage-when-is-a-second-angiography-indicated
#14
Asma Bashir, Ronni Mikkelsen, Leif Sørensen, Niels Sunde
Purpose Repeat imaging in patients with non-aneurysmal subarachnoid hemorrhage (NASAH) remains controversial. We aim to report our experience with NASAH with different hemorrhage patterns, and to investigate the need for further diagnostic workup to determine the underlying cause of hemorrhage. Method We conducted a retrospective analysis of all spontaneous SAH with an initial negative computed tomography (CT) with angiography (CTA) and/or digital subtraction angiography (DSA) from October 2011 through May 2017...
January 1, 2017: Neuroradiology Journal
https://www.readbyqxmd.com/read/29154259/evaluation-of-coefficients-to-derive-organ-and-effective-doses-from-cone-beam-ct-cbct-scans-a-monte-carlo-study
#15
Abdullah Abuhaimed, Colin J Martin
Regular imaging is used throughout image guided radiation therapy (IGRT) to improve treatment delivery. In order for treatment procedures to be optimized, the doses delivered by imaging exposures should be taken into account. CT dosimetry methods based on the CT dose index (CTDI), measured with a 100 mm long pencil ionization chamber (CTDI<sub>100</sub>) in standard phantoms, are not designed for the cone beam CT (CBCT) imaging systems used in radiotherapy, therefore a modified version has been proposed for CBCT by the International Electrotechnical Commission (CTDI<sub>IEC</sub>)...
November 20, 2017: Journal of Radiological Protection: Official Journal of the Society for Radiological Protection
https://www.readbyqxmd.com/read/29153967/the-role-of-advanced-imaging-in-assessing-response-to-definitive-chemoradiation-before-prophylactic-cranial-irradiation-in-limited-stage-small-cell-lung-cancer
#16
Aparna H Kesarwala, Diana J Lu, Eric Xanthopoulos, Smith Apisarnthanarax, Keith A Cengel, Tracey L Evans, Charu Aggarwal, Roger B Cohen, Corey J Langer, Ramesh Rengan, Charles B Simone
INTRODUCTION: Prophylactic cranial irradiation (PCI) improves survival for small-cell lung cancer (SCLC). Evidence for PCI in limited-stage SCLC largely derives from studies requiring only chest x-ray (CXR) to determine remission status. We analyzed thoracic chemoradiation therapy (TCRT) outcomes according to imaging modality to determine which patients benefitted most from PCI. PATIENTS AND METHODS: All limited-stage SCLC patients who received TCRT as well as PCI at our institution were reviewed...
October 12, 2017: Clinical Lung Cancer
https://www.readbyqxmd.com/read/29153896/sequential-ct-findings-in-patients-with-non-small-cell-lung-cancer-receiving-nivolumab
#17
David Y Johnson, Ryan G Short, Edward F Patz
BACKGROUND: Nivolumab is a novel immunotherapy that was recently approved for treatment of advanced non-small-cell lung cancer (NSCLC). Patients treated with checkpoint inhibitors may show variable computed tomography (CT) features on follow-up imaging, and it is unclear how reliable conventional response criteria are to determine patient management and outcomes. We report the spectrum of sequential CT findings in patients with advanced stage lung cancer who received nivolumab in an effort to better inform appropriate imaging strategies...
October 28, 2017: Clinical Lung Cancer
https://www.readbyqxmd.com/read/29153509/transcatheter-embolization-of-a-giant-coronary-artery-pseudoaneurysm
#18
Pratik Dalal, Divyashree Varma, Ripa Chakravorty, Salil Sethi, Steven Bailey, Anand Prasad
A 53-year-old diabetic male with sternal dehiscence presented with recurrent staphylococcus bacteremia 2years after coronary artery bypass grafting (CABG). He was found to have a giant right coronary artery (RCA) pseudoaneurysm and a coronary cameral fistula on imaging. Due to excessive surgical risk, the patient underwent percutaneous treatment with a 5mm Amplatzer vascular plug 4 (St. Jude Medical, St.Paul, MN). Post-procedure imaging showed successful cessation of flow into the pseudoaneurysm and follow-up CT scan demonstrated significant improvement in the size of the pseudoaneurysm...
November 16, 2017: Cardiovascular Revascularization Medicine: Including Molecular Interventions
https://www.readbyqxmd.com/read/29152838/commissioning-of-the-world-s-first-compact-pencil-beam-scanning-proton-therapy-system
#19
Rajesh Pidikiti, Bijal C Patel, Matthew R Maynard, Joseph P Dugas, Joseph Syh, Narayan Sahoo, Hsinshun Terry Wu, Lane R Rosen
This paper summarizes clinical commissioning of the world's first commercial, clinically utilized installation of a compact, image-guided, pencil-beam scanning, intensity-modulated proton therapy system, the IBA Proteus(®) ONE, at the Willis-Knighton Cancer Center (WKCC) in Shreveport, LA. The Proteus(®) ONE is a single-room, compact-gantry system employing a cyclotron-generated proton beam with image guidance via cone-beam CT as well as stereoscopic orthogonal and oblique planar kV imaging. Coupling 220° of gantry rotation with a 6D robotic couch capable of in plane patient rotations of over 180° degrees allows for 360° of treatment access...
November 20, 2017: Journal of Applied Clinical Medical Physics
https://www.readbyqxmd.com/read/29151544/-creation-and-evaluation-of-educational-programs-for-additional-delayed-scan-of-fdg-pet-ct
#20
Ryota Wada, Takashi Kamiya, Kouichi Fujino, Junpei Ueda, Kayako Isohashi, Mitsuaki Tatsumi, Jun Hatazawa
Generally, FDG-PET/CT image is acquired at the 60th minute after tracer administration. Depending on the clinical case, additional delayed scans may be useful. However, it is difficult to judge whether additional delayed scan is useful or not. The purposes of this study were creation and evaluation of educational programs to help radiological technologists to decide the usefulness of additional delayed scan of FDG-PET/CT. METHODS: Educational programs consisted of the instructional materials and the judgment test of clinical cases...
2017: Nihon Hoshasen Gijutsu Gakkai Zasshi
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