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3 dimensional reconstruction

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https://www.readbyqxmd.com/read/29036875/three-novel-accurate-pixel-driven-projection-methods-for-2d-ct-and-3d-epr-imaging
#1
Zhiwei Qiao, Gage Redler, Zhiguo Gui, Yuhua Qian, Boris Epel, Howard Halpern
OBJECTIVES: This work aims to explore more accurate pixel-driven projection methods for iterative image reconstructions in order to reduce high-frequency artifacts in the generated projection image. METHODS: Three new pixel-driven projection methods namely, small-pixel-large-detector (SPLD), linear interpolation based (LIB) and distance anterpolation based (DAB), were proposed and applied to reconstruct images. The performance of these methods was evaluated in both two-dimensional (2D) computed tomography (CT) images via the modified FORBILD phantom and three-dimensional (3D) electron paramagnetic resonance (EPR) images via the 6-spheres phantom...
October 10, 2017: Journal of X-ray Science and Technology
https://www.readbyqxmd.com/read/29033190/3d-modelling-of-radical-prostatectomy-specimens-developing-a-method-to-quantify-tumor-morphometry-for-prostate-cancer-risk-prediction
#2
Marcus C Hovens, Kevin Lo, Michael Kerger, John Pedersen, Timothy Nottle, Natalie Kurganovs, Andrew Ryan, Justin S Peters, Daniel Moon, Anthony J Costello, Niall M Corcoran, Matthew K H Hong
Prostate cancer displays a wide spectrum of clinical behaviour from biological indolence to rapidly lethal disease, but we remain unable to accurately predict an individual tumor's future clinical course at an early curable stage. Beyond basic dimensions and volume calculations, tumor morphometry is an area that has received little attention, as it requires the analysis of the prostate gland and tumor foci in three-dimensions. Previous efforts to generate three-dimensional prostate models have required specialised graphics units and focused on the spatial distribution of tumors for optimisation of biopsy strategies rather than to generate novel morphometric variables such as tumor surface area...
September 27, 2017: Pathology, Research and Practice
https://www.readbyqxmd.com/read/29033084/morphological-characteristics-and-classification-of-mandibular-first-molars-having-2-distal-roots-or-canals-3-dimensional-biometric-analysis-using-cone-beam-computed-tomography-in-a-korean-population
#3
Yemi Kim, Byoung-Duck Roh, Yooseok Shin, Bom Sahn Kim, Yoo-Lim Choi, Aena Ha
INTRODUCTION: The aim of this study was to determine the morphologic characteristics of mandibular first molars having 2 canals in distal roots. Interorifice distance, buccal bone thickness, and root curvature were evaluated using cone-beam computed tomography images in a Korean population. METHODS: In total, 1958 mandibular first molars were evaluated in axial, coronal, sagittal, and paraxial planes. Distal roots having 2 canals were classified according to their root and canal shapes (2 roots, 2 canals [2R2C]; 1 root, 2 canals with 2 apical foramina [1R2C(2-2)]; and 1 root, 2 canals with 1 apical foramen [1R2C(2-1)])...
October 12, 2017: Journal of Endodontics
https://www.readbyqxmd.com/read/29032808/torso-geometry-reconstruction-and-body-surface-electrode-localization-using-three-dimensional-photography
#4
Erick A Perez-Alday, Jason A Thomas, Muammar Kabir, Golriz Sedaghat, Nichole Rogovoy, Eelco van Dam, Peter van Dam, William Woodward, Cristina Fuss, Maros Ferencik, Larisa G Tereshchenko
We conducted a prospective clinical study (n=14; 29% female) to assess the accuracy of a three-dimensional (3D) photography-based method of torso geometry reconstruction and body surface electrodes localization. The position of 74 body surface electrocardiographic (ECG) electrodes (diameter 5mm) was defined by two methods: 3D photography, and CT (marker diameter 2mm) or MRI (marker size 10×20mm) imaging. Bland-Altman analysis showed good agreement in X (bias -2.5 [95% limits of agreement (LoA) -19.5 to 14...
September 1, 2017: Journal of Electrocardiology
https://www.readbyqxmd.com/read/29032716/prediction-of-coronary-plaque-progression-using-biomechanical-factors-and-vascular-characteristics-based-on-computed-tomography-angiography
#5
Xiujian Liu, Guanghui Wu, Chuangye Xu, Yuna He, Lixia Shu, Yuyang Liu, Nan Zhang, Changyan Lin
OBJECTIVES: Coronary atherosclerotic plaques progress in a highly individual manner. Accurately predicting plaque progression will promote clinical management of atherosclerosis. The purpose of this study was to investigate the role of local biomechanics factors and vascular characteristics in coronary plaque progression and arterial remodeling. METHODS: Computed tomography angiography-based three-dimensional reconstruction of the native right coronary artery was performed in vivo in twelve patients with acute coronary syndrome at baseline and 12-month follow-up...
October 16, 2017: Computer Assisted Surgery (Abingdon, England)
https://www.readbyqxmd.com/read/29032714/fusion-of-optical-coherence-tomography-and-angiography-for-numerical-simulation-of-hemodynamics-in-bioresorbable-stented-coronary-artery-based-on-patient-specific-model
#6
Chenxi Huang, Yuanhang Zhou, Xiaoxin Mao, Jianhua Tong, Lei Zhang, Fei Chen, Yongtao Hao
Three-dimensional simulations of coronary artery using finite element analysis are considered as effective means to understand the biomechanical properties after the stent was deployed. Bioresorbable vascular scaffolds are new-generation stents used by people. Intravascular optical coherence tomography is an emerging technique for detecting struts. The common 3 D reconstruction methods are using Intravascular Ultrasound (IVUS) or angiographies. However, it loses the details about geometry model. Fusing of optical coherence tomography and angiography to reconstruct the bioresorbable stented coronary artery based on patient-specific mode is an innovative method to reconstruct the high fidelity geometry...
October 16, 2017: Computer Assisted Surgery (Abingdon, England)
https://www.readbyqxmd.com/read/29031297/3-dimensional-x-ray-microtomography-methodology-for-characterization-of-monolithic-stationary-phases-and-columns-for-capillary-liquid-chromatography-a-tutorial
#7
REVIEW
Carla G A da Silva, Carla Beatriz Grespan Bottoli, Carol H Collins
In this tutorial we describe a fast, nondestructive, three-dimensional (3-D) view approach to be used in morphology characterization of capillary monoliths and columns by reconstruction from X-ray microtomography (XMT) obtained by acquiring projection images of the sample from a number of different directions. The method comprises imaging acquisition, imaging reconstruction using specific algorithms and imaging analysis by generation of a 3-D image of the sample from radiographic images. The 3-D images show the morphological data for bulk macropore space and skeleton connectivity of the monoliths and were compared with other images from imaging techniques such as scanning electron microscopy (SEM) and field emission scanning electron microscopy (FESEM) and with chromatographic performance...
October 23, 2017: Analytica Chimica Acta
https://www.readbyqxmd.com/read/29030781/clinical-and-imaging-features-in-lung-torsion-and-description-of-a-novel-imaging-sign
#8
Mark M Hammer, Rachna Madan
PURPOSE: We set out to identify the clinical and imaging features seen in lung torsion, a rare but emergent diagnosis leading to vascular compromise of a lobe or entire lung. METHODS: We retrospectively identified 10 patients with torsion who underwent chest CT. We evaluated each case for the presence of bronchial obstruction and abnormal fissure orientation. In seven patients who underwent contrast-enhanced CTs, we assessed for the presence of the antler sign, a novel sign seen on axial images demonstrating abnormal curvature of the artery and branches originating on one side...
October 13, 2017: Emergency Radiology
https://www.readbyqxmd.com/read/29028985/impact-of-coronary-lumen-reconstruction-on-the-estimation-of-endothelial-shear-stress-in-vivo-comparison-of-three-dimensional-quantitative-coronary-angiography-and-three-dimensional-fusion-combining-optical-coherent-tomography
#9
Jihoon Kweon, Soo-Jin Kang, Young-Hak Kim, June-Goo Lee, Seungbong Han, Hojin Ha, Dong Hyun Yang, Joon-Won Kang, Tae-Hwan Lim, Osung Kwon, Jung-Min Ahn, Pil Hyung Lee, Duk-Woo Park, Seung-Whan Lee, Cheol Whan Lee, Seong-Wook Park, Seung-Jung Park
Aims: It is not clearly elucidated how the fusion technique improves the accuracy of endothelial shear stress (ESS) prediction, in comparison with that of three-dimensional (3D) quantitative coronary angiography (QCA) alone. We aimed to evaluate the difference in geometric measurements and haemodynamic estimation between 3D QCA and a 3D fusion model combining 3D QCA and optical coherence tomography (OCT). Methods and results: Computational fluid dynamics was assessed in the coronary models of 20 patients...
September 25, 2017: European Heart Journal Cardiovascular Imaging
https://www.readbyqxmd.com/read/29027586/computational-simulation-study-on-ilio-sacral-screw-fixations-for-pelvic-ring-injuries-and-implications-in-asian-sacrum
#10
Chang-Soo Chon, Jin-Hoon Jeong, Bokku Kang, Han Sung Kim, Gu-Hee Jung
OBJECTIVES: Despite a high possibility of technique-related complications, ilio-sacral (IS) screw fixation is the mainstay of operative management in posterior pelvic ring injuries. We aimed to make IS screw trajectory with fully intraosseous path that was optimal and consistent, and confirm the possibility of transiliac-transsacral (TITS) screw fixation in Asian sacrum. METHODS: Eighty-two cadaveric sacra (42 males and 40 females) were enrolled and underwent continuous 1...
October 13, 2017: European Journal of Orthopaedic Surgery & Traumatology: Orthopédie Traumatologie
https://www.readbyqxmd.com/read/29027240/low-dose-ct-reconstruction-using-spatially-encoded-nonlocal-penalty
#11
Kyungsang Kim, Georges El Fakhri, Quanzheng Li
PURPOSE: Computed tomography (CT) is one of the most used imaging modalities for imaging both symptomatic and asymptomatic patients. However, because of the high demand for lower radiation dose during CT scans, the reconstructed image can suffer from noise and artifacts due to the trade-off between the image quality and the radiation dose. The purpose of this paper is to improve the image quality of quarter dose images and to select the best hyperparameters using the regular dose image as ground truth...
October 2017: Medical Physics
https://www.readbyqxmd.com/read/29023351/rapid-deployment-aortic-valves-deliver-superior-hemodynamic-performance-in-vitro
#12
Lisong Ai, Harvey Chen, Virginia Lin, Vinayak N Bapat
OBJECTIVE: Clinical studies have demonstrated excellent hemodynamic performance of rapid deployment aortic valves; however, few studies have directly compared the performance of these valves with conventional bioprosthetic valves. Thus, the hemodynamic function of the EDWARDS INTUITY valve (rapid deployment valve) was compared with the Edwards Magna Ease valve in vitro (Edwards Lifesciences Corp, Irvine, CA USA). METHODS: Elastomeric material was used to create an aortic root model that included a left ventricular outflow tract and aortic annulus...
October 10, 2017: Innovations: Technology and Techniques in Cardiothoracic and Vascular Surgery
https://www.readbyqxmd.com/read/29021876/coracoid-process-morphology-using-3d-ct-imaging-in-a-malaysian-population
#13
I I Imma, N M Nizlan, A R Ezamin, S Yusoff, M H Shukur
Introduction: The aims of this study are to define the coracoid process anatomy in a Malaysian population, carried out on patients in Hospital Serdang with specific emphasis on the dimension of the base of coracoid process which is important in coraco-acromial (CC) ligament reconstruction, to define the average amount of bone available for use in coracoid transfer, and to compare the size of coracoid process based on gender and race, and with findings in previous studies. Materials and Methods: Fifteen pairs of computed tomography (CT) based 3-dimensional models of shoulders of patients aged between 20 to 60 years old were examined...
July 2017: Malaysian Orthopaedic Journal
https://www.readbyqxmd.com/read/29021848/scar-characteristics-derived-from-two-and-three-dimensional-reconstructions-of-cardiac-contrast-enhanced-magnetic-resonance-images-relationship-to-ventricular-tachycardia-inducibility-and-ablation-success
#14
Kazumasa Sonoda, Yasuo Okumura, Ichiro Watanabe, Koichi Nagashima, Hiroaki Mano, Rikitake Kogawa, Naoko Yamaguchi, Keiko Takahashi, Kazuki Iso, Kimie Ohkubo, Toshiko Nakai, Satoshi Kunimoto, Atsushi Hirayama
BACKGROUND: The relationship between cardiac contrast-enhanced magnetic resonance imaging (CE-MRI)-derived scar characteristics and substrate for ventricular tachycardia (VT) in patients with structural heart disease (SHD) has not been fully investigated. METHODS: This study included 51 patients (mean age, 63.3±15.1 years) who underwent CE-MRI with SHD and VT induction testing before ablation. Late gadolinium-enhanced (LGE) regions on MRI slices were quantified by thresholding techniques...
October 2017: Journal of Arrhythmia
https://www.readbyqxmd.com/read/29019873/reconstruction-left-atrium-and-isolation-pulmonary-veins-of-paroxysmal-atrial-fibrillation-using-single-contact-force-catheter-with-zero-x-ray-exposure-a-consort-study
#15
Jian Qiang Zhang, Rong Hui Yu, Jia Bing Liang, De Yong Long, Cai Hua Sang, Chang Sheng Ma, Jian Zeng Dong
BACKGROUND: Conventional ablation of paroxysmal atrial fibrillation (PAF) is associated with radiation risks for patients and laboratory staff. Three-dimensional (3D) mapping system capable of showing contact force (CF) and direction of catheter tip may compensate for nonfluoroscopic safety issues. OBJECTIVE: The aim of this study was to investigate the feasibility of zero x-ray exposure during reconstruction left atrium (LA) and ablation. METHODS: Single, CF catheter, and 3D mapping system were used to reconstruct LA and isolate pulmonary veins (PV) in all patients...
October 2017: Medicine (Baltimore)
https://www.readbyqxmd.com/read/29019497/tem-nano-moir%C3%A3-evaluation-for-an-invisible-lattice-structure-near-the-grain-interface
#16
Hongye Zhang, Huihui Wen, Zhanwei Liu, Qi Zhang, Huimin Xie
Moiré technique is a powerful, important and effective tool for scientific research, from the nano-scale to the macro-scale, which is essentially the interference between two or more periodic structures with a similar frequency. In this study, an inverse transmission electron microscopy (TEM) nano-Moiré method has been proposed, for the first time, to reconstruct an invisible lattice structure near the grain interface, where only one kind of lattice structure and Moiré fringe were visible in a high resolution TEM (HRTEM) image simultaneously...
October 11, 2017: Nanoscale
https://www.readbyqxmd.com/read/29017792/three-dimensional-printing-of-navigational-template-in-localization-of-pulmonary-nodule-a-pilot-study
#17
Lei Zhang, Mu Li, Zeyao Li, Xiermaimaiti Kedeer, Long Wang, Ziwen Fan, Chang Chen
BACKGROUND: Small pulmonary nodules are a common problem, especially with the wide implementation of lung cancer-screening program. This poses a great challenge to thoracic surgeons because of the difficulty of nodule localization. We recently built an efficient, customized navigational template using 3-dimensional (3D) printing technology to facilitate the procedure of lung nodule localization. This study aims to investigate its feasibility in clinical application. METHODS: Patients with peripheral lung nodules (<2 cm) were enrolled...
September 1, 2017: Journal of Thoracic and Cardiovascular Surgery
https://www.readbyqxmd.com/read/28994717/sparse-aperture-inisar-imaging-via-sequential-multiple-sparse-bayesian-learning
#18
Shuanghui Zhang, Yongxiang Liu, Xiang Li
Interferometric inverse synthetic aperture radar (InISAR) imaging for sparse-aperture (SA) data is still a challenge, because the similarity and matched degree between ISAR images from different channels are destroyed by the SA data. To deal with this problem, this paper proposes a novel SA-InISAR imaging method, which jointly reconstructs 2-dimensional (2-D) ISAR images from different channels through multiple response sparse Bayesian learning (M-SBL), a modification of sparse Bayesian learning (SBL), to achieve sparse recovery for multiple measurement vectors (MMV)...
October 10, 2017: Sensors
https://www.readbyqxmd.com/read/28989723/single-particle-cryo-em-using-alignment-by-classification-abc-the-structure-of-lumbricus-terrestris-haemoglobin
#19
Pavel Afanasyev, Charlotte Seer-Linnemayr, Raimond B G Ravelli, Rishi Matadeen, Sacha De Carlo, Bart Alewijnse, Rodrigo V Portugal, Navraj S Pannu, Michael Schatz, Marin van Heel
Single-particle cryogenic electron microscopy (cryo-EM) can now yield near-atomic resolution structures of biological complexes. However, the reference-based alignment algorithms commonly used in cryo-EM suffer from reference bias, limiting their applicability (also known as the 'Einstein from random noise' problem). Low-dose cryo-EM therefore requires robust and objective approaches to reveal the structural information contained in the extremely noisy data, especially when dealing with small structures. A reference-free pipeline is presented for obtaining near-atomic resolution three-dimensional reconstructions from heterogeneous ('four-dimensional') cryo-EM data sets...
September 1, 2017: IUCrJ
https://www.readbyqxmd.com/read/28989265/technical-considerations-in-revision-anterior-cruciate-ligament-acl-reconstruction-for-operative-techniques-in-orthopaedics
#20
Jeremy M Burnham, Elmar Herbst, Thierry Pauyo, Thomas Pfeiffer, Darren L Johnson, Freddie H Fu, Volker Musahl
As the incidence of anterior cruciate ligament (ACL) reconstruction continues to increase, the rate of revision surgery continues to climb. Revision surgery has inherent challenges that must be addressed in order to achieve successful results. The cause of the primary ACL reconstruction failure should be determined, and careful preoperative planning should be performed to address the cause(s) of failure. Each patient undergoing revision surgery should undergo a thorough history and physical examination, receive full length alignment radiographs, lateral radiographs, 45-degree flexion weight-bearing postero-anterior radiographs, and patellofemoral radiographs...
March 2017: Operative Techniques in Orthopaedics
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