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https://www.readbyqxmd.com/read/29916778/quantitative-susceptibility-mapping-for-following-intracranial-hemorrhage
#1
Hongfu Sun, Ana C Klahr, Mahesh Kate, Laura C Gioia, Derek J Emery, Kenneth S Butcher, Alan H Wilman
Purpose To follow the evolution of intracranial hemorrhage (ICH) by using quantitative susceptibility mapping (QSM). Materials and Methods Thirty-six patients with ICH confirmed at CT were enrolled to follow ICH evolution on day 2, 7, and 30 after symptom onset between August 2013 and April 2017. QSM was reconstructed from MRI gradient-echo phase images acquired at 1.5 T or 3.0 T. ICH regions were manually drawn on two-dimensional sections of co-registered CT and MR images independently by two raters. The ICH areas and mean values were compared between CT and MRI by using Bland-Altman plots and Pearson correlation...
June 19, 2018: Radiology
https://www.readbyqxmd.com/read/29916770/investigation-of-subdural-electrode-displacement-in-invasive-epilepsy-surgery-workup-using-neuronavigation-and-intraoperative-mri
#2
Bjoern Sommer, Stefan Rampp, Arnd Doerfler, Hermann Stefan, Hajo M Hamer, Michael Buchfelder, Karl Roessler
OBJECTIVES: One of the main obstacles of electrode implantation in epilepsy surgery is the electrode shift between implantation and the day of explantation. We evaluated this possible electrode displacement using intraoperative MRI (iopMRI) data and CT/MRI reconstruction. METHODS: Thirteen patients (nine female, four male, median age 26 ± 9.4 years) suffering from drug-resistant epilepsy were examined. After implantation, the position of subdural electrodes was evaluated by 3...
June 19, 2018: Neurological Research
https://www.readbyqxmd.com/read/29916727/geometric-distortion-of-panoramic-reconstruction-in-third-molar-tilting-assessments-a-comprehensive-evaluation
#3
Saturnino Marco Lupi, Pietro Galinetto, Matteo Cislaghi, Arianna Rodriguez Y Baena, Andrea Scribante, Ruggero Rodriguez Y Baena
OBJECTIVES: To evaluate the geometric distortion of tilting of mandibular third molars with respect to second molars on panoramic reconstruction. MATERIAL AND METHODS: Cone-beam computed tomography (CBCT) reconstructions of 160 third molars, obtained due to an indication of risk of inferior alveolar nerve damage during surgery, were used. CBCT-reconstructed panoramic images were used as bi-dimensional images, to avoid distortions other than geometric distortions...
June 19, 2018: Dento Maxillo Facial Radiology
https://www.readbyqxmd.com/read/29915839/semiconducting-edges-and-flake-shape-evolution-of-monolayer-gase-role-of-edge-reconstructions
#4
Ning Wang, Dan Cao, Jun Wang, Pei Liang, Xiaoshuang Chen, Haibo Shu
Group-III metal monochalcogenides have emerged as a new class of two-dimensional (2D) semiconductor materials. For the integration of 2D materials for various potential device applications, there is an inevitable need to reduce their dimensionality into specific sized nanostructures with edges. Owing to the properties of finite-sized 2D nanostructures strongly related to the edge configurations, the precise understanding of the edge geometric structures at an atomic level is of particular importance. By means of first-principles calculations, the geometric structures and electronic properties of stable zigzag and armchair edges in a prototype example GaSe monolayer have been identified...
June 19, 2018: Nanoscale
https://www.readbyqxmd.com/read/29911905/volumetric-evaluation-of-root-resorption-on-the-upper-incisors-using-cone-beam-computed-tomography-after-1-year-of-orthodontic-treatment-in-adult-patients-with-marginal-bone-loss
#5
Pornputthi Puttaravuttiporn, Mutita Wongsuwanlert, Chairat Charoemratrote, Chidchanok Leethanakul
OBJECTIVES: To determine upper incisor root resorption, volume loss, and the relationship between root volume loss and tooth movement after 1 year of orthodontic treatment in patients with marginal bone loss. MATERIALS AND METHODS: A total of 30 women (46.3 ± 5.4 years old) with moderate upper incisor bone loss who required intrusion during orthodontic treatment were recruited. Pre- and post-treatment cone beam computed tomography images were reconstructed. Upper incisors at pre- and post-treatment were superimposed; labio- and palato-apical, middle, and coronal third root volumes were assessed...
June 18, 2018: Angle Orthodontist
https://www.readbyqxmd.com/read/29909922/expression-and-localization-of-forkhead-transcription-factor-a1-in-the-three-dimensional-reconstructed-eccrine-sweat-glands
#6
Haihong Li, Liyun Chen, Mingjun Zhang, Sitian Xie, Liuhanghang Cheng
Previously studies showed that Forkhead transcription factor A1 (FoxA1) was associated with sweat secretion. To investigate the expression and localization of FoxA1 in the three-dimensional (3D) reconstructed eccrine sweat glands, eccrine sweat gland cells were transplanted subcutaneously into nude mice with Matrigel, and at 2, 3, 4, 5, 6, 8, 10 and 12 weeks post-transplantation, the reconstructed eccrine sweat glands were removed and immunostained for FoxA1 and co-immunostained for FoxA1 and eccrine sweat markers, K7, carbonic anhydrase II (CA Ⅱ), gross cystic disease fluid protein-15 (GCDFP-15) and α-smooth muscle actin (α-SMA), and FoxA1 and sweat secretion-related proteins, Na+ -K+ -ATPase α and Na+ -K+ -2Cl- cotransporter 1 (NKCC1)...
June 14, 2018: Acta Histochemica
https://www.readbyqxmd.com/read/29909060/quantification-of-bone-microstructure-in-the-wrist-using-cone-beam-computed-tomography
#7
Karen Mys, Filip Stockmans, Evie Vereecke, G Harry van Lenthe
Due to the rising life expectancy, bone diseases (e.g. osteoporosis, osteoarthritis) and trauma (e.g. fracture) have become an important socio-economic burden. Accurate visualization and quantification of the bone microstructure in vivo is seen as an important step to enhance diagnosis and treatment. Micro-computed tomography (microCT) has become the gold standard in three-dimensional (3D) imaging of trabecular bone structure. Yet, usage is limited to ex vivo analyses, hence, it cannot be used to evaluate bone and bone adaptive responses in a patient...
June 14, 2018: Bone
https://www.readbyqxmd.com/read/29908850/mapping-of-238-quadrilateral-plate-fractures-with-three-dimensional-computed-tomography
#8
Yun Yang, Min Yi, Chang Zou, Zhao-Kui Yan, Xin-An Yan, Yue Fang
PURPOSE: The primary goal of this study is to create a frequency map of a series of the quadrilateral plate fractures, explore the characteristics of fracture map and to further propose a new classification. METHODS: We used a consecutive series of 238 quadrilateral plate fractures to create 3-dimensional reconstruction images, which were superimposed and oriented to fit a model hemipelvis template by aligning specific pelvis landmarks. Fracture lines were identified and traced to create a quadrilateral plate fracture map...
May 31, 2018: Injury
https://www.readbyqxmd.com/read/29906304/epifluorescence-microscopy-study-of-a-quadruple-node-of-triple-junctions-of-grain-boundaries-in-a-eu-2-doped-kcl-kbr-solid-solution-by-using-the-doping-ion-as-a-fluorochrome
#9
A E Cordero-Borboa, R Unda-Angeles
A typical quadruple node (QN) of triple junctions (TJs) of grain boundaries (GBs) in a Eu2+ -doped KCl0.52 Br0.48 solid solution is investigated from the geometrical point of view by epifluorescence microscopy using the doping ion as a fluorochrome. The excitation and fluorescence optical properties of the fluorochrome were previously characterised by spectrophotometry whereas the structural nature of the studied material as well as its Bravais lattice type, unit cell size and long-range translational order degree was determined by X-ray diffraction...
June 15, 2018: Journal of Microscopy
https://www.readbyqxmd.com/read/29906289/activation-recovery-interval-imaging-of-premature-ventricular-contraction
#10
Ting Yang, Long Yu, Qi Jin, Liqun Wu, Bin He
Dispersion of ventricular repolarization due to abnormal activation contributes to the susceptibility to cardiac arrhythmias. However, the global pattern of repolarization is difficult to assess clinically. Activation recovery interval (ARI) has been used to understand the properties of ventricular repolarization. In this study, we developed an ARI imaging technique to noninvasively reconstruct three-dimensional (3D) ARI maps in 10 premature ventricular contraction (PVC) patients and evaluated the results with the endocardial ARI maps recorded by a clinical navigation system (CARTO)...
2018: PloS One
https://www.readbyqxmd.com/read/29905512/cranioplasty-with-a-low-cost-customized-polymethylmethacrylate-implant-using-a-desktop-3d-printer
#11
Jesús A Morales-Gómez, Everardo Garcia-Estrada, Jorge E Leos-Bortoni, Miriam Delgado-Brito, Luis E Flores-Huerta, Adriana A De La Cruz-Arriaga, Luis J Torres-Díaz, Ángel R Martínez-Ponce de León
OBJECTIVE Cranioplasty implants should be widely available, low in cost, and customized or easy to mold during surgery. Although autologous bone remains the first choice for repair, it cannot always be used due to infection, fragmentation, bone resorption, or other causes, which led to use of synthetic alternatives. The most frequently used allogenic material for cranial reconstructions with long-term results is polymethylmethacrylate (PMMA). Three-dimensional printing technology has allowed the production of increasingly popular customized, prefabricated implants...
June 15, 2018: Journal of Neurosurgery
https://www.readbyqxmd.com/read/29901530/the-direct-oblique-method-a-new-gold-standard-for-bronchoscopic-navigation-that-is-superior-to-automatic-methods
#12
Kotaro Miyake, Osamu Morimura, Takako Inoue, Kenya Yoshida, Izumi Nagatomo, Takashi Kijima, Atsushi Kumanogoh
BACKGROUND: The purpose of this study was to identify bronchi on computed tomographic (CT) images, manual analysis is more accurate than automatic methods. Nonetheless, manual bronchoscopic navigation is not preferred as it involves mentally reconstructing a route to a bronchial target by interpreting 2-dimensional CT images. Here, we established the direct oblique method (DOM), a form of manual bronchoscopic navigation that does not necessitate mental reconstruction, and compared it with automatic virtual bronchoscopic navigation (VBN)...
June 12, 2018: Journal of Bronchology & Interventional Pulmonology
https://www.readbyqxmd.com/read/29900085/target-volume-delineation-using-diffusion-weighted-imaging-for-mr-guided-radiotherapy-a-case-series-of-laryngeal-cancer-validated-by-pathology
#13
Hans Ligtenberg, Tim Schakel, Jan Willem Dankbaar, Lilian N Ruiter, Boris Peltenburg, Stefan M Willems, Nicolien Kasperts, Chris H J Terhaard, Cornelis P J Raaijmakers, Marielle E P Philippens
In radiotherapy treatment planning, tumor delineation based on diffusion-weighted imaging (DWI) by magnetic resonance imaging (MRI) is a promising technique. MR-only-based target definition becomes important with the recent development of MRI integrated radiotherapy treatment modalities. In this case series, DWI-based gross tumor volume (GTV) was validated using pathology and compared with a clinical GTV based on computed tomography (CT) imaging and MRI. This case series includes three patients with a laryngeal tumor...
April 11, 2018: Curēus
https://www.readbyqxmd.com/read/29899654/implantation-of-customized-preshaped-implant-for-orbital-fractures-with-the-aid-of-three-dimensional-printing
#14
Sirous Nekooei, Mahsa Sardabi, Mohammad Etezad Razavi, Amirhossein Nekooei, Mohammad Yaser Kiarudi
Orbital floor fractures alone or in conjunction with other facial skeletal fractures are the most commonly encountered midfacial fractures. The technological advances in 3-dimensional (3D) printing allow the physical prototyping of 3D models, so creates an accurate representation of the patient's specific anatomy. A 56-year-old Caucasian man with severe hypoglobus and enophthalmos with an extensive blowout fracture was scheduled for reconstruction. First, 3D physical models were created based on the computed tomography scan datasets from patient...
January 2018: Middle East African Journal of Ophthalmology
https://www.readbyqxmd.com/read/29895231/compensatory-strategies-that-reduce-knee-extensor-demand-during-a-bilateral-squat-change-from-3-to-5-months-following-anterior-cruciate-ligament-reconstruction
#15
Susan M Sigward, Ming-Sheng M Chan, Paige E Lin, Sara Y Almansouri, Kristamarie A Pratt
Study Design Controlled laboratory study, longitudinal. Background Decreased extensor moments in the surgical knee during bilateral squats can persist longer than one year following anterior cruciate ligament reconstruction (ACLr). This is accomplished using inter-limb and intra-limb compensations. Objectives Assess loading during squatting longitudinally, 3 and 5 months post-ACLr, and to determine the extent to which inter- and intra-limb compensations contribute to reduced knee extensor moments. Methods 11 individuals (4 males) underwent 3-dimensional motion analysis of a squat at 3 and 5 months post-ACLr...
June 12, 2018: Journal of Orthopaedic and Sports Physical Therapy
https://www.readbyqxmd.com/read/29893748/fluctuation-of-quantitative-values-on-acquisition-time-and-the-reconstruction-conditions-in-99mtc-spect
#16
Masakazu Tsujimoto, Seiji Shirakawa, Atsushi Teramoto, Masanobu Ishiguro, Kazuhisa Nakane, Yoshihiro Ida, Hiroshi Toyama
OBJECTIVE: This study aims to carry out a quantitative analysis with high reproducibility using single-photon emission computed tomography/computed tomography (SPECT/CT); we investigated the optimum parameters for the acquisition and the reconstruction. MATERIALS AND METHODS: SPECT images were acquired with varying time per view using SPECT phantom (JS-10) and the body phantom of National Electrical Manufacturers Association and International Electrotechnical Commission (Body-phantom), respectively...
July 2018: Nuclear Medicine Communications
https://www.readbyqxmd.com/read/29891460/-three-dimensional-spatial-measurement-versus-conventional-ct-planning-in-laparoscopic-partial-nephrectomy-for-renal-tumors
#17
Zheng-Fei Hu, Shi-Dong Lv, Jian-Feng Huang, Lin Zhang, Chan-Tao Huang, Yi-Wen Li, Wen-Hua Huang, Jian-Ping Ye, Qiang Wei
OBJECTIVE: To analyze the advantages of spatial measurement of anatomical parameters in a 3D model in surgical planning for laparoscopic partial nephrectomy (LPN). METHODS: From February, 2016 to October, 2017, 37 patients diagnosed with T1 renal mass underwent LPN based on 3D reconstruction after enhanced CT scanning using the Uromedix-3D system (group A), and another 38 patients received LPN with conventional CT planning (group B). The anatomical parameters were measured in the reconstructed 3D model and the demographic data, surgical outcome and postoperative data were compared between the two groups...
May 20, 2018: Nan Fang Yi Ke da Xue Xue Bao, Journal of Southern Medical University
https://www.readbyqxmd.com/read/29886664/-the-experience-of-surgical-treatment-for-ebstein-anomaly-in-141-children
#18
X F Yu, L S Qiu, J F Liu, X Liu, H F Hong
Objective: To explore the surgical strategy for Ebstein anomaly in children. Methods: From January 2003 to December 2015, a total of 141 cases of Ebstein anomaly were treated at Department of Pediatric Cardiothoracic Surgery, Shanghai Children's Medical Center, School of Medicine, Shanghai Jiaotong University. There were 65 male and 76 female patients, with age of (6.9±1.6) years (ranging from 10 months to 15 years), weight of (19.6±4.7) kg (ranging from 6.5 to 59.0 kg). All patients were diagnosed by 2 dimensional Doppler echocardiography and the septal leaflet and posterior leaflet displaced downward from 1...
June 1, 2018: Zhonghua Wai Ke za Zhi [Chinese Journal of Surgery]
https://www.readbyqxmd.com/read/29886068/intraoperative-3-dimensional-cone-beam-computed-tomographic-imaging-during-reconstruction-of-the-zygoma-and-orbit
#19
Thomas Gander, Michael Blumer, Claudio Rostetter, Maximilian Wagner, Daniel Zweifel, Paul Schumann, Daniel B Wiedemeier, Martin Rücker, Harald Essig
OBJECTIVE: Fractures of the zygoma and orbit are common facial skeleton injuries. Inadequate reduction and internal fixation may result in functional and aesthetic impairment. The aim of this study was to assess the use of intraoperative 3-dimensional (3-D) cone beam computed tomography (CBCT) for determining the intraoperative revision rate and the need for additional reconstruction of the orbit. STUDY DESIGN: We conducted a retrospective analysis of 48 consecutive patients (15 females, 33 males) suffering from simple or complex zygomatic fractures, seen between June 2015 and October 2016...
May 7, 2018: Oral Surgery, Oral Medicine, Oral Pathology and Oral Radiology
https://www.readbyqxmd.com/read/29884926/three-dimensional-nanofiber-scaffolds-are-superior-to-two-dimensional-mats-in-micro-oriented-extraction-of-chlorobenzenes
#20
Habib Bagheri, Faranak Manshaei, Omid Rezvani
Three-dimensional (3D) polyamide scaffolds were fabricated by applying a solvent bath as the collecting element. Electrospun nanofibers were immersed into the solvent bath to give a material with a laminated 3D texture. In parallel, 2D nanofibers were synthesized and utilized as microextractive phases in a needle trap device to compare the capabilities of 2D and 3D materials in terms of headspace extraction of various chlorobenzenes (chlorobenzene, 1,2-dichlorobenzene, 1,4-dichlorobenzene, 1,2,4-trichlorobenzene and 1,2,3,4-tetrachlorobenzene)...
June 8, 2018: Mikrochimica Acta
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