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https://www.readbyqxmd.com/read/29142872/isolated-tympanic-plate-fracture-detected-by-cone-beam-computed-tomography-report-of-four-cases-with-review-of-literature
#1
Ashita Ritesh Kalaskar, Ritesh Kalaskar
The tympanic plate is a small part of the temporal bone that separates the mandibular condyle from the external auditory canal. Fracture of this small plate is rare and usually associated with other bony fractures, mainly temporal and mandibular bone. There is a limited amount of literature on this subject, which increases the chance of cases being overlooked by physicians and radiologists. This is further supported by purely isolated cases of tympanic plate fracture without evidence of other bony fractures...
October 2017: Journal of the Korean Association of Oral and Maxillofacial Surgeons
https://www.readbyqxmd.com/read/29137676/a-medium-invasiveness-multi-level-patient-s-specific-template-for-pedicle-screw-placement-in-the-scoliosis-surgery
#2
Farhad Azimifar, Kamran Hassani, Amir Hossein Saveh, Farhad Tabatabai Ghomsheh
BACKGROUND: Several methods including free-hand technique, fluoroscopic guidance, image-guided navigation, computer-assisted surgery system, robotic platform and patient's specific templates are being used for pedicle screw placement. These methods have screw misplacements and are not always easy to be applied. Furthermore, it is necessary to expose completely a large portions of the spine in order to access fit entirely around the vertebrae. METHODS: In this study, a multi-level patient's specific template with medium invasiveness was proposed for pedicle screw placement in the scoliosis surgery...
November 14, 2017: Biomedical Engineering Online
https://www.readbyqxmd.com/read/29128913/radiographic-markers-for-measuring-tibial-rotation-based-on-ct-reconstructed-radiographs-an-accuracy-and-feasibility-study
#3
David Hakimian, Amal Khoury, Rami Mosheiff, Meir Liebergall, Yoram A Weil
OBJECTIVES: Malreduction in the axial plane (malrotation) following tibial fracture surgery is often undiagnosed. A few clinical and radiographic methods have been proposed for measuring tibial rotation intraoperatively, yet have failed to match the accuracy of computed tomography (CT). The aim of this study was to develop radiographic tools for future intraoperative assessment of the tibial shaft rotation profile. METHODS: The setting was a laboratory computerized analysis...
November 11, 2017: Skeletal Radiology
https://www.readbyqxmd.com/read/29127775/four-dimensional-computed-tomography-evaluation-of-condylar-movement-in-a-patient-with-temporomandibular-joint-osteoarthritis
#4
Masaya Akashi, Takumi Hasegawa, Satoru Takahashi, Takahide Komori
Temporomandibular joint (TMJ) osteoarthritis (OA) is a disease of the bone, cartilage, and supporting tissues of the joint. Patients with advanced TMJ-OA often have symptoms such as pain, swelling, and joint dysfunction, and they sometimes require surgical intervention when conservative treatment is not effective. The etiology of TMJ-OA remains elusive. The usefulness of 4-dimensional (4D) computed tomography (CT) in motion analysis of various joints has recently been reported. This article introduces a novel imaging technique of 4D CT that aims to identify kinematic features that may be associated with the etiology of TMJ-OA...
October 16, 2017: Journal of Oral and Maxillofacial Surgery
https://www.readbyqxmd.com/read/29127293/three-dimensional-printed-polylactic-acid-hydroxyapatite-composite-scaffolds-for-prefabricating-vascularized-tissue-engineered-bone-an-in-vivo-bioreactor-model
#5
Haifeng Zhang, Xiyuan Mao, Danyang Zhao, Wenbo Jiang, Zijing Du, Qingfeng Li, Chaohua Jiang, Dong Han
The repair of large bone defects with complex geometries remains a major clinical challenge. Here, we explored the feasibility of fabricating polylactic acid-hydroxyapatite (PLA-HA) composite scaffolds. These scaffolds were constructed from vascularized tissue engineered bone using an in vivo bioreactor (IVB) strategy with three-dimensional printing technology. Specifically, a rabbit model was established to prefabricate vascularized tissue engineered bone in two groups. An experimental group (EG) was designed using a tibial periosteum capsule filled with 3D printed (3DP) PLA-HA composite scaffolds seeded with bone marrow stromal cells (BMSCs) and crossed with a vascular bundle...
November 10, 2017: Scientific Reports
https://www.readbyqxmd.com/read/29124484/four-dimensional-computed-tomography-clinical-impact-for-patients-with-primary-hyperparathyroidism
#6
EDITORIAL
Nancy Perrier
No abstract text is available yet for this article.
November 9, 2017: Annals of Surgical Oncology
https://www.readbyqxmd.com/read/29123390/hyperinflated-lungs-compress-the-heart-during-expiration-in-copd-patients-a-new-finding-on-dynamic-ventilation-computed-tomography
#7
Yanyan Xu, Tsuneo Yamashiro, Hiroshi Moriya, Maho Tsubakimoto, Nanae Tsuchiya, Yukihiro Nagatani, Shin Matsuoka, Sadayuki Murayama
Purpose: The aims of this study were to evaluate dynamic changes in heart size during the respiratory cycle using four-dimensional computed tomography (CT) and to understand the relationship of these changes to airflow limitation in smokers. Materials and methods: A total of 31 smokers, including 13 with COPD, underwent four-dimensional dynamic-ventilation CT during regular breathing. CT data were continuously reconstructed every 0.5 s, including maximum cross-sectional area (CSA) of the heart and mean lung density (MLD)...
2017: International Journal of Chronic Obstructive Pulmonary Disease
https://www.readbyqxmd.com/read/29121945/potential-dosimetric-benefits-of-adaptive-tumor-tracking-over-the-internal-target-volume-concept-for-stereotactic-body-radiation-therapy-of-pancreatic-cancer
#8
Konstantina Karava, Stefanie Ehrbar, Oliver Riesterer, Johannes Roesch, Stefan Glatz, Stephan Klöck, Matthias Guckenberger, Stephanie Tanadini-Lang
BACKGROUND: Radiotherapy for pancreatic cancer has two major challenges: (I) the tumor is adjacent to several critical organs and, (II) the mobility of both, the tumor and its surrounding organs at risk (OARs). A treatment planning study simulating stereotactic body radiation therapy (SBRT) for pancreatic tumors with both the internal target volume (ITV) concept and the tumor tracking approach was performed. The two respiratory motion-management techniques were compared in terms of doses to the target volume and organs at risk...
November 9, 2017: Radiation Oncology
https://www.readbyqxmd.com/read/29119104/usefulness-of-computed-tomography-image-processing-by-osirix-software-in-detecting-wooden-and-bamboo-foreign-bodies
#9
Shinpei Matsuda, Hitoshi Yoshimura, Hisato Yoshida, Takashi Ryoke, Takashi Yoshida, Naoyuki Aikawa, Kazuo Sano
Objective: The aim of this study was to evaluate the usefulness of reconstructed computed tomography (CT) images using OsiriX software in detecting wooden and bamboo foreign bodies. Methods: Four sizes of wet and dry wooden and bamboo foreign bodies were selected to be analyzed. Those in the air and in the head of edible swine were scanned with a multidetector row CT scanner. The images were evaluated with OsiriX software in the bone and the abdomen window setting as unprocessed images...
2017: BioMed Research International
https://www.readbyqxmd.com/read/29118466/associations-of-functional-microrna-binding-site-polymorphisms-in-il23-th17-inflammatory-pathway-genes-with-gastric-cancer-risk
#10
Kaiyan Dong, Yajuan Xu, Qian Yang, Jiachen Shi, Jicheng Jiang, Yi Chen, Chunhua Song, Kaijuan Wang
IL23/Th17 axis acts as an inflammatory pathway in gastric carcinogenesis. MicroRNA- (miRNA-) binding site single-nucleotide polymorphisms (SNPs) of inflammatory genes may alter gastric cancer (GC) susceptibility. In this study, four miRNA binding site SNPs (rs3748067 of IL17A, rs887796, rs1468488 of IL17RA, and rs10889677 of IL23R) were genotyped from 500 patients and 500 controls. Unconditional logistic regression analyses and multifactor dimensionality reduction software were used to evaluate the relationships of SNPs with GC and gene-environment interactions, respectively...
2017: Mediators of Inflammation
https://www.readbyqxmd.com/read/29118113/measurement-of-micro-scale-soil-deformation-around-roots-using-four-dimensional-synchrotron-tomography-and-image-correlation
#11
S D Keyes, L Cooper, S Duncan, N Koebernick, D M McKay Fletcher, C P Scotson, A van Veelen, I Sinclair, T Roose
This study applied time lapse (four-dimensional) synchrotron X-ray computed tomography to observe micro-scale interactions between plant roots and soil. Functionally contrasting maize root tips were repeatedly imaged during ingress into soil columns of varying water content and compaction. This yielded sequences of three-dimensional densiometric data, representing time-resolved geometric soil and root configurations at the micronmetre scale. These data were used as inputs for two full-field kinematic quantification methods, which enabled the analysis of three-dimensional soil deformation around elongating roots...
November 2017: Journal of the Royal Society, Interface
https://www.readbyqxmd.com/read/29114853/the-evolution-of-the-manus-of-early-theropod-dinosaurs-is-characterized-by-high-inter-and-intraspecific-variation
#12
Daniel E Barta, Sterling J Nesbitt, Mark A Norell
The origin of the avian hand, with its reduced and fused carpals and digits, from the five-fingered hands and complex wrists of early dinosaurs represents one of the major transformations of manus morphology among tetrapods. Much attention has been directed to the later part of this transition, from four- to three-fingered taxa. However, earlier anatomical changes may have influenced these later modifications, possibly paving the way for a later frameshift in digit identities. We investigate the five- to four-fingered transition among early dinosaurs, along with changes in carpus morphology...
November 8, 2017: Journal of Anatomy
https://www.readbyqxmd.com/read/29114620/reducing-radiation-dose-and-enhancing-imaging-quality-of-4dct-for-radiation-therapy-using-iterative-reconstruction-algorithms
#13
George Noid, An Tai, Guang-Pei Chen, Jared Robbins, X Allen Li
Purpose: Four-dimensional computed tomography (CT) images are typically used to quantify the necessary internal target volumes for thoracic and abdominal tumors. However, 4-dimensional CT is typically associated with excessive imaging dose to patients and the situation is exacerbated when using repeat 4-dimensional CT imaging on a weekly or daily basis throughout fractionated therapy. The aim of this work is to evaluate an iterative reconstruction (IR) algorithm that helps reduce the imaging dose to the patient while maintaining imaging quality as quantified by point spread function and contrast-to-noise ratios (CNRs)...
July 2017: Advances in Radiation Oncology
https://www.readbyqxmd.com/read/29112643/assessment-of-fetal-congenital-heart-diseases-by-4-dimensional-ultrasound-using-spatiotemporal-image-correlation-pictorial-review
#14
Edward Araujo Júnior, Gabriele Tonni, Nathalie Jeanne Bravo-Valenzuela, Fabricio Da Silva Costa, Simon Meagher
The aim of this pictorial review is to describe the technical advances achieved through the application of 4-dimensional (4D) ultrasound using spatiotemporal image correlation (STIC) over conventional 2-dimensional ultrasound in the prenatal detection of congenital heart disease (CHD). Spatiotemporal image correlation is a volume imaging technique that simplifies fetal heart studies while providing more diagnostic information than is typically available from traditional 2-dimensional studies. Four-dimensional software allows the study of cardiac anatomy and function during a single cardiac cycle and has greatly contributed to diagnostic enhancement of CHD...
November 6, 2017: Ultrasound Quarterly
https://www.readbyqxmd.com/read/29108342/comparison-of-biological-target-volume-metrics-based-on-fdg-pet-ct-and-4dct-for-primary-non-small-cell-lung-cancer
#15
Yingjie Zhang, Jianbin Li, Yili Duan, Wei Wang, Fengxiang Li, Qian Shao, Min Xu
Fluorodeoxyglucose positron emission tomography-computed tomography (PET-CT) and four-dimensional CT (4DCT) are used in several methods for defining the biological target volume (BTV) in primary non-small cell lung cancer (NSCLC). Disagreements between the assessments using these methodologies make the use of BTV for radiotherapy planning controversial. In this study, we compared existing methods with our proposed internal biological target volume (IBTV) metric, derived by combining internal target volume (ITV) and BTV metrics...
October 3, 2017: Oncotarget
https://www.readbyqxmd.com/read/29105007/simulation-of-the-human-airways-using-virtual-topology-tools-and-meshing-optimization
#16
A Fernández-Tena, A C Marcos, R Agujetas, C Ferrera
A method is proposed to improve the quality of the three-dimensional airway geometric models using a commercial software, checking the number of elements, meshing time, and aspect ratio and skewness parameters. The use of real and virtual topologies combined with patch-conforming and patch-independent meshing algorithms results in four different models being the best solution the combination of virtual topology and patch-independent algorithm, due to an excellent aspect ratio and skewness of the elements, and minimum meshing time...
November 5, 2017: Biomechanics and Modeling in Mechanobiology
https://www.readbyqxmd.com/read/29095963/comparative-evaluation-of-a-four-implant-supported-polyetherketoneketone-framework-prosthesis-a-three-dimensional-finite-element-analysis-based-on-cone-beam-computed-tomography-and-computer-aided-design
#17
Ki-Sun Lee, Sang-Wan Shin, Sang-Pyo Lee, Jong-Eun Kim, Jee-Hwan Kim, Jeong-Yol Lee
PURPOSE: The purpose of this pilot study was to evaluate and compare polyetherketoneketone (PEKK) with different framework materials for implant-supported prostheses by means of a three-dimensional finite element analysis (3D-FEA) based on cone beam computed tomography (CBCT) and computer-aided design (CAD) data. MATERIALS AND METHODS: A geometric model that consisted of four maxillary implants supporting a prosthesis framework was constructed from CBCT and CAD data of a treated patient...
November 2017: International Journal of Prosthodontics
https://www.readbyqxmd.com/read/29091067/the-emerging-role-of-4d-synchrotron-x-ray-micro-tomography-for-climate-and-fossil-energy-studies-five-experiments-showing-the-present-capabilities-at%C3%A2-beamline-8-3-2-at-the-advanced-light-source
#18
Marco Voltolini, Abdelmoula Haboub, Shan Dou, Tae Hyuk Kwon, Alastair A MacDowell, Dilworth Y Parkinson, Jonathan Ajo-Franklin
Continuous improvements at X-ray imaging beamlines at synchrotron light sources have made dynamic synchrotron X-ray micro-computed tomography (SXR-µCT) experiments more routinely available to users, with a rapid increase in demand given its tremendous potential in very diverse areas. In this work a survey of five different four-dimensional SXR-µCT experiments is presented, examining five different parameters linked to the evolution of the investigated system, and tackling problems in different areas in earth sciences...
November 1, 2017: Journal of Synchrotron Radiation
https://www.readbyqxmd.com/read/29079049/evaluation-of-the-periodontal-disease-effect-on%C3%A2-pulp-volume
#19
Arslan Terlemez, Raif Alan, Onur Gezgin
INTRODUCTION: The success of periodontal and endodontic treatments depends on the total recovery from both conditions regardless of their occurrence as independent or combined lesions. There is strong presumptive evidence that teeth with periodontal disease may cause pulpal inflammation and degeneration. Therefore, the goal of this study was to establish a correlation between periodontitis and pulp volume. METHODS: Thirty-four dental images from 17 patients obtained by cone-beam computed tomography were analyzed by medical software to create three-dimensional images...
October 24, 2017: Journal of Endodontics
https://www.readbyqxmd.com/read/29078584/anatomical-video-assisted-thoracoscopic-surgery-segmentectomies-based-on-the-three-dimensional-reformation-images
#20
Qianli Ma, Tong Bao, Haitao Zhang, Chaoyang Liang, Deruo Liu
Segmentectomy was first done in 1939 by Churchill and Belsey in 1939. Video-assisted thoracoscopic surgery (VATS) segmentectomies are still more technically challenging than VATS lobectomies. With the increasing rate of early stage lung carcinomas, the thoracoscopic segmentectomies may have a major role in a near future. Four anatomical VATS segmentectomy videos clips were shared in this study. CT three-dimensional reformation could exactly show the small pulmonary nodule's precise position, clarifies the surrounding structures' relationship like the pulmonary artery (PA), pulmonary vein (PV), bronchus (B), fissure, and lymph nodes...
2017: J Vis Surg
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