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https://www.readbyqxmd.com/read/28943701/automatic-falx-cerebri-and-tentorium-cerebelli-segmentation-from-magnetic-resonance-images
#1
Jeffrey Glaister, Aaron Carass, Dzung L Pham, John A Butman, Jerry L Prince
The falx cerebri and tentorium cerebelli are dural structures found in the brain. Due to the roles both structures play in constraining brain motion, the falx and tentorium must be identified and included in finite element models of the head to accurately predict brain dynamics during injury events. To date there has been very little research work on automatically segmenting these two structures, which is understandable given that their 1) thin structure challenges the resolution limits of in vivo 3D imaging, and 2) contrast with respect to surrounding tissue is low in standard magnetic resonance imaging...
February 2017: Proceedings of SPIE
https://www.readbyqxmd.com/read/28943698/4d-dsa-reconstruction-using-tomosynthesis-projections
#2
Marc Buehler, Jordan M Slagowski, Charles A Mistretta, Charles M Strother, Michael A Speidel
We investigate the use of tomosynthesis in 4D DSA to improve the accuracy of reconstructed vessel time-attenuation curves (TACs). It is hypothesized that a narrow-angle tomosynthesis dataset for each time point can be exploited to reduce artifacts caused by vessel overlap in individual projections. 4D DSA reconstructs time-resolved 3D angiographic volumes from a typical 3D DSA scan consisting of mask and iodine-enhanced C-arm rotations. Tomosynthesis projections are obtained either from a conventional C-arm rotation, or from an inverse geometry scanning-beam digital x-ray (SBDX) system...
February 2017: Proceedings of SPIE
https://www.readbyqxmd.com/read/28942369/slanted-support-window-based-stereo-matching-for-surface-reconstruction-of-microscopic-samples
#3
Ahmadreza Baghaie, Chi Zhang, Ali Bakhshinejad, Heather A Owen, Hongyang Chao, Roshan M D'Souza, Zeyun Yu
This work is to address the limitations of 2D Scanning Electron Microscopy (SEM) micrographs in providing 3D topographical information necessary for various types of analysis in biological and biomedical sciences as well as mechanical and material engineering by investigating modern stereo vision methodologies for 3D surface reconstruction of microscopic samples. To achieve this, micrograph pairs of the microscopic samples are acquired by utilizing an SEM equipped with motor controlled specimen stage capable of precise translational, rotational movements and tilting of the specimen stage...
September 8, 2017: Micron: the International Research and Review Journal for Microscopy
https://www.readbyqxmd.com/read/28941654/soft-tissue-fillers-for-adipose-tissue-regeneration-from-hydrogel-development-toward-clinical-applications
#4
REVIEW
I Van Nieuwenhove, L Tytgat, M Ryx, P Blondeel, F Stillaert, H Thienpont, H Ottevaere, P Dubruel, S Van Vlierberghe
There is a clear and urgent clinical need to develop soft tissue fillers that outperform the materials currently used for adipose tissue reconstruction. Recently, extensive research has been performed within this field of adipose tissue engineering as the commercially available products and the currently existing techniques are concomitant with several disadvantages. Commercial products are highly expensive and associated with an imposing need for repeated injections. Lipofilling or free fat transfer has an unpredictable outcome with respect to cell survivalandpotential resorption of the fat grafts...
September 20, 2017: Acta Biomaterialia
https://www.readbyqxmd.com/read/28940748/rapid-compressed-sensing-reconstruction-of-3d-non-cartesian-mri
#5
Corey A Baron, Nicholas Dwork, John M Pauly, Dwight G Nishimura
PURPOSE: Conventional non-Cartesian compressed sensing requires multiple nonuniform Fourier transforms every iteration, which is computationally expensive. Accordingly, time-consuming reconstructions have slowed the adoption of undersampled 3D non-Cartesian acquisitions into clinical protocols. In this work we investigate several approaches to minimize reconstruction times without sacrificing accuracy. METHODS: The reconstruction problem can be reformatted to exploit the Toeplitz structure of matrices that are evaluated every iteration, but it requires larger oversampling than what is strictly required by nonuniform Fourier transforms...
September 23, 2017: Magnetic Resonance in Medicine: Official Journal of the Society of Magnetic Resonance in Medicine
https://www.readbyqxmd.com/read/28940664/a-novel-histological-examination-with-dynamic-3d-reconstruction-from-multiple-immunohistochemically-stained-sections-of-a-programmed-cell-death-ligand-1-positive-colon-cancer
#6
Shotaro Korehisa, Tetsuo Ikeda, Shinji Okano, Hiroshi Saeki, Eiji Oki, Yoshinao Oda, Makoto Hashizume, Yoshihiko Maehara
AIMS: Programmed cell death-ligand 1 (PD-L1) expression is observed in patients with high level microsatellite instability (MSI-H) colon cancer, which is susceptible to immune checkpoint blockade. The aim of this study was to investigate the interrelationship between PD-L1-positive cells and cytotoxic T cells, lymphatic vessels, and vascular endothelium using histological examination with the three-dimensional (3D) reconstruction of a PD-L1-positive colon cancer. METHODS AND RESULTS: Serial sections of MSI-H colon cancer tissue were stained with haematoxylin and eosin (H&E) and Masson trichrome stains; PD-L1, CD8, D2-40, and CD31 immunohistochemistry were performed...
September 21, 2017: Histopathology
https://www.readbyqxmd.com/read/28940528/assessment-of-a-photon-counting-detector-for-a-dual-energy-c-arm-angiographic-system
#7
Moiz Ahmad, Rebecca Fahrig, Leland Pung, Martin Spahn, Niko S Köster, Silke Reitz, Teri Moore, Jang-Hwan Choi, Waldo Hinshaw, Yan Xia, Kerstin Müller
PURPOSE: This article presents the implementation and assessment of photon-counting dual-energy x-ray detector technology for angiographic C-arm systems in interventional radiology. METHODS: A photon-counting detector was successfully integrated into a clinical C-arm CT system. Detector performance was assessed using image uniformity metrics in both 2D projections and 3D cone-beam computed tomography (CBCT) images. Uniform exposure fields were acquired to analyze projection images and scans of a homogeneous cylinder phantom were taken to analyze 3D reconstructions...
September 22, 2017: Medical Physics
https://www.readbyqxmd.com/read/28940484/phase-correction-for-three-dimensional-3d-diffusion-weighted-interleaved-epi-using-3d-multiplexed-sensitivity-encoding-and-reconstruction-3d-muser
#8
Hing-Chiu Chang, Edward S Hui, Pui-Wai Chiu, Xiaoxi Liu, Nan-Kuei Chen
PURPOSE: Three-dimensional (3D) multiplexed sensitivity encoding and reconstruction (3D-MUSER) algorithm is proposed to reduce aliasing artifacts and signal corruption caused by inter-shot 3D phase variations in 3D diffusion-weighted echo planar imaging (DW-EPI). THEORY AND METHODS: 3D-MUSER extends the original framework of multiplexed sensitivity encoding (MUSE) to a hybrid k-space-based reconstruction, thereby enabling the correction of inter-shot 3D phase variations...
September 23, 2017: Magnetic Resonance in Medicine: Official Journal of the Society of Magnetic Resonance in Medicine
https://www.readbyqxmd.com/read/28940483/improved-quantitative-90-y-bremsstrahlung-spect-ct-reconstruction-with-monte-carlo-scatter-modeling
#9
Yuni K Dewaraja, Se Young Chun, Ravi N Srinivasa, Ravi K Kaza, Kyle C Cuneo, Bill S Majdalany, Paula M Novelli, Michael Ljungberg, Jeffrey A Fessler
PURPOSE: In (90) Y microsphere radioembolization (RE), accurate post-therapy imaging-based dosimetry is important for establishing absorbed dose versus outcome relationships for developing future treatment planning strategies. Additionally, accurately assessing microsphere distributions is important because of concerns for unexpected activity deposition outside the liver. Quantitative (90) Y imaging by either SPECT or PET is challenging. In (90) Y SPECT model based methods are necessary for scatter correction because energy window-based methods are not feasible with the continuous bremsstrahlung energy spectrum...
September 22, 2017: Medical Physics
https://www.readbyqxmd.com/read/28939204/determining-the-fate-of-cranial-sutures-after-surgical-correction-of%C3%A2-non-syndromic-craniosynostosis
#10
So Young Kim, Hyung-Jin Shin, So Young Lim
PURPOSE: "Secondary craniosynostosis" (SCS) refers to a loss of sutures after corrective vault reconstruction. There are no prior studies that comprehensively review SCS in various types of non-syndromic craniosynostosis. We assessed idiopathic and iatrogenic SCS using 3-dimensional computed tomography (3D CT). We also performed a systematic review to estimate the overall incidence of SCS in each craniosynostosis type, and to characterize its clinical features. MATERIALS AND METHODS: We retrospectively reviewed the CT images of patients who underwent surgical correction of craniosynostosis for all types of craniosynostosis between August 1999 and December 2015...
August 19, 2017: Journal of Cranio-maxillo-facial Surgery
https://www.readbyqxmd.com/read/28938228/sex-determination-from-chest-measurements-in-a-sample-of-egyptian-adults-using-multislice-computed-tomography
#11
Ragaa T Darwish, Manal H Abdel-Aziz, Abdel-Aziz M El Nekiedy, Zahraa K Sobh
BACKGROUND: In forensic sciences to determine one's sex is quite important during the identity defining stage. The reliability of sex determination depends on the completeness of the remains and the degree of sexual dimorphism inherent in the population. Computed Tomography is the imaging modality of choice for two- and three-dimensional documentation and analysis of many autopsy findings. OBJECTIVE: The aim of the present work was to assess the reliability of Three-dimensional Multislice Computed Tomography (3D MSCT) to determine sexual dimorphism from certain chest measurements; sternum and fourth rib using the 3D MSCT and to develop equations for sex determination from these bones among adult Egyptians sample...
September 11, 2017: Journal of Forensic and Legal Medicine
https://www.readbyqxmd.com/read/28937285/assessment-of-automatic-segmentation%C3%A2-of-teeth-using%C3%A2-a-watershed-based-method
#12
Antoine Galibourg, Jean Dumoncel, Norbert Telmon, Adèle Calvet, Jérôme Michetti, Delphine Maret
OBJECTIVES: Tooth 3D automatic segmentation (AS) is being actively developed in research and clinical fields. Here, we assess the effect of automatic segmentation using a watershed-based method on the accuracy and reproducibility of 3D reconstructions in volumetric measurements by comparing it with a semi-automatic (SAS) method that has already been validated. METHODS: The study sample comprised 52 teeth, scanned with micro computed tomography (micro CT) (41µm voxel size) and cone beam computed tomography (CBCT) (76 ; 200 and 300 µm voxel size)...
September 21, 2017: Dento Maxillo Facial Radiology
https://www.readbyqxmd.com/read/28934648/evaluation-of-tooth-root-surface-area-using-a-three-dimensional-scanning-technique-and-cone-beam-computed-tomographic-reconstruction-in-vitro
#13
Tong Wang, Xibo Pei, Feng Luo, Lingling Jia, Han Qin, Xinting Cheng, Yiyuan Xue, Jian Wang, Qianbing Wan
OBJECTIVE: To study the feasibility of measuring root surface area (RSA) by 3D scanning technique and cone beam computed tomography (CBCT) reconstruction in vitro. DESIGN: Twenty extracted teeth (10 single-rooted teeth and 10 multi-rooted teeth) were collected in this study. The RSA of the extracted teeth was measured by the membrane technique, 3D scanning technique, and CBCT reconstruction. A standard part was also designed to check the accuracy of each method...
July 21, 2017: Archives of Oral Biology
https://www.readbyqxmd.com/read/28932697/thoracic-wall-trauma-misdiagnosed-lesions-on-radiographs-and-usefulness-of-ultrasound-multidetector-computed-tomography-and-magnetic-resonance-imaging
#14
REVIEW
Xavier Tomas, Catherine Facenda, Nuno Vaz, Edgar Augusto Castañeda, Montserrat Del Amo, Ana Isabel Garcia-Diez, Jaime Pomes
Blunt injuries to the chest wall are an important chapter on emergency room (ER) departments, being the third most common injuries in trauma patients which ominous complications could appear. This article describes different types of traumatic events affecting the chest wall, which maybe misdiagnosed with conventional X-ray. Special emphasis has been done in computed tomography (CT) and multidetector CT (MDCT) imaging. This technique is considered the "gold-standard" for those traumatic patients, due to its fast acquisition covering the whole area of interest in axial plane, reconstructing multiplanar (2D, 3D) volume-rendered images with a superb quality and angiographic CT capabilities for evaluating vascular damage...
August 2017: Quantitative Imaging in Medicine and Surgery
https://www.readbyqxmd.com/read/28932188/is-there-evidence-for-myelin-modeling-by-astrocytes-in-the-normal-adult-brain
#15
Alfredo Varela-Echevarría, Víctor Vargas-Barroso, Carlos Lozano-Flores, Jorge Larriva-Sahd
A set of astrocytic process associated with altered myelinated axons is described in the forebrain of normal adult rodents with confocal, electron microscopy, and 3D reconstructions. Each process consists of a protuberance that contains secretory organelles including numerous lysosomes which polarize and open next to disrupted myelinated axons. Because of the distinctive asymmetric organelle distribution and ubiquity throughout the forebrain neuropil, this enlargement is named paraxial process (PAP). The myelin envelope contiguous to the PAP displays focal disruption or disintegration...
2017: Frontiers in Neuroanatomy
https://www.readbyqxmd.com/read/28931437/acute-reverse-annular-remodeling-during-mitraclip-%C3%A2-therapy-predicts-improved-clinical-outcome-in-heart-failure-patients-a-3d-echocardiography-study
#16
Theresa Herbrand, Silke Eschenhagen, Tobias Zeus, Eva Kehmeier, Katharina Hellhammer, Verena Veulemans, Malte Kelm, Jan Balzer
BACKGROUND: Transcatheter mitral valve repair (TMVR) has been shown to have acute effects on mitral valve geometry in patients with functional mitral regurgitation (FMR). This study investigates the impact of MitraClip(®) therapy-induced annular remodeling on clinical outcome and mitral regurgitation in heart failure patients. METHODS: TMVR was performed successfully in 45 patients with FMR. In this study, mitral valve datasets were obtained before and directly after MitraClip(®) implantation using three-dimensional (3D) transesophageal echocardiography, and were analyzed offline retrospectively using dedicated 3D reconstruction software...
September 20, 2017: European Journal of Medical Research
https://www.readbyqxmd.com/read/28930985/visualizing-angiogenesis-by-multiphoton-microscopy-in-vivo-in-genetically-modified-3d-plga-nhap-scaffold-for-calvarial-critical-bone-defect-repair
#17
Jian Li, Holger Jahr, Wei Zheng, Pei-Gen Ren
The reconstruction of critically sized bone defects remains a serious clinical problem because of poor angiogenesis within tissue-engineered scaffolds during repair, which gives rise to a lack of sufficient blood supply and causes necrosis of the new tissues. Rapid vascularization is a vital prerequisite for new tissue survival and integration with existing host tissue. The de novo generation of vasculature in scaffolds is one of the most important steps in making bone regeneration more efficient, allowing repairing tissue to grow into a scaffold...
September 7, 2017: Journal of Visualized Experiments: JoVE
https://www.readbyqxmd.com/read/28929419/high-resolution-mr-imaging-for-dental-impressions-a-feasibility-study
#18
Julian Boldt, Kurt Rottner, Marc Schmitter, Andreas Hopfgartner, Peter Jakob, Ernst-Jürgen Richter, Olga Tymofiyeva
OBJECTIVES: Magnetic resonance imaging is an emerging technology in dental medicine. While low-resolution MRI has especially provided means to examine the temporomandibular joint due to its anatomic inaccessibility, it was the goal of this study to assess whether high-resolution MRI is capable of delivering a dataset sufficiently precise enough to serve as digital impression of human teeth. MATERIALS AND METHODS: An informed and consenting patient in need of dental restoration with fixed partial dentures was chosen as subject...
September 19, 2017: Clinical Oral Investigations
https://www.readbyqxmd.com/read/28929219/3d-printing-for-clinical-application-in-otorhinolaryngology
#19
REVIEW
Nongping Zhong, Xia Zhao
Three-dimensional (3D) printing is a promising technology that can use a patient's image data to create complex and personalized constructs precisely. It has made great progress over the past few decades and has been widely used in medicine including medical modeling, surgical planning, medical education and training, prosthesis and implants. Three-dimensional (3D) bioprinting is a powerful tool that has the potential to fabricate bioengineered constructs of the desired shape layer-by-layer using computer-aided deposition of living cells and biomaterials...
September 19, 2017: European Archives of Oto-rhino-laryngology
https://www.readbyqxmd.com/read/28927642/iterative-approach-for-3d-reconstruction-of-the-femur-from-un-calibrated-2d-radiographic-images
#20
Kibeom Youn, Moon Seok Park, Jehee Lee
Three-dimensional reconstruction of the femur is important for surgical planning in patients with cerebral palsy. This study aimed to reconstruct the three-dimensional femur shape from un-calibrated bi-planar radiographic images using self-calibration to allow for low-dose preoperative planning. The existing self-calibration techniques require anatomical landmarks that are clearly visible on bi-planar images, which are not available on the femur. In our newly developed method, the self-calibration is performed so that the contour of the statistical shape matches the image contour while the statistical shape is concomitantly optimized...
September 15, 2017: Medical Engineering & Physics
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