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https://www.readbyqxmd.com/read/28651069/automatic-mpst-cut-for-segmentation-of-carpal-bones-from-mr-volumes
#1
Laura Gemme, Sonia Nardotto, Silvana G Dellepiane
In the context of rheumatic diseases, several studies suggest that Magnetic Resonance Imaging (MRI) allows the detection of the three main signs of Rheumatoid Arthritis (RA) at higher sensitivities than available through conventional radiology. The rapid, accurate segmentation of bones is an essential preliminary step for quantitative diagnosis, erosion evaluation, and multi-temporal data fusion. In the present paper, a new, semi-automatic, 3D graph-based segmentation method to extract carpal bone data is proposed...
June 12, 2017: Computers in Biology and Medicine
https://www.readbyqxmd.com/read/28650971/a-lab-on-phone-instrument-with-varifocal-microscope-via-a-liquid-actuated-aspheric-lens-lal
#2
Yiin-Kuen Fuh, Zheng-Hong Lai, Li-Han Kau, Hung-Jui Huang
In this paper, we introduce a novel concept of liquid-actuated aspheric lens (LAL) with a built-in aspheric polydimethylsiloxane lens (APL) to enable the design of compact optical systems with varifocal microscopic imaging. The varifocal lens module consists of a sandwiched structures such as 3d printed syringe pump functionally serves as liquid controller. Other key components include two acrylic cylinders, a rigid separator, a APL/membrane composite (APLMC) embedded PDMS membrane. In functional operation, the fluidic controller was driven to control the pressure difference and ALPMC deformation...
2017: PloS One
https://www.readbyqxmd.com/read/28650806/3d-active-contour-segmentation-based-on-sparse-linear-combination-of-training-shapes-scots
#3
M Mehdi Farhangi, Hichem Frigui, Albert Seow, Amir A Amini
SCoTS captures a sparse representation of shapes in an input image through a linear span of previously delineated shapes in a training repository. The model updates shape prior over level set iterations and captures variabilities in shapes by a sparse combination of the training data. The level set evolution is therefore driven by a data term as well as a term capturing valid prior shapes. During evolution, the shape prior influence is adjusted based on shape reconstruction, with the assigned weight determined from the degree of sparsity of the representation...
June 26, 2017: IEEE Transactions on Medical Imaging
https://www.readbyqxmd.com/read/28650514/automatic-segmentation-of-the-spine-by-means-of-a-probabilistic-atlas-with-a-special-focus-on-ribs-suppression
#4
Silvia Ruiz-España, Juan Domingo, Antonio Díaz-Parra, Esther Dura, Víctor D'Ocón-Alcañiz, Estanislao Arana, David Moratal
PURPOSE: The development of automatic and reliable algorithms for the detection and segmentation of the vertebrae are of great importance prior to any diagnostic task. However, an important problem found to accurately segment the vertebrae is the presence of the ribs in the thoracic region. To overcome this problem, a probabilistic atlas of the spine has been developed dealing with the proximity of other structures, with a special focus on ribs suppression. METHODS: The data sets used consist of Computed Tomography images corresponding to 21 patients suffering from spinal metastases...
June 26, 2017: Medical Physics
https://www.readbyqxmd.com/read/28650110/reproducibility-of-in-vivo-magnetic-resonance-imaging-t1-rho-and-t2-relaxation-time-measurements-of-hip-cartilage-at-3-0t-in-healthy-volunteers
#5
Angeline Nemeth, Lucy Di Marco, Florent Boutitie, Michael Sdika, Denis Grenier, Muriel Rabilloud, Olivier Beuf, Jean-Baptiste Pialat
PURPOSE: To assess the T1 ρ and T2 values in the hip cartilage of healthy volunteers and to evaluate the reproducibility of these measurements. MATERIALS AND METHODS: The right hip joint of 30 asymptomatic volunteers was explored with 3T magnetic resonance imaging (MRI). Quantitative 3D T1 ρ- and T2 -maps sequences were repeated twice with a 30-minute delay (immediate reproducibility). The same protocol was repeated 14 days later (short-term reproducibility). Immediate and short-term reproducibility were estimated using coefficients of variation and correlation concordance coefficients (CCC)...
June 26, 2017: Journal of Magnetic Resonance Imaging: JMRI
https://www.readbyqxmd.com/read/28649159/initial-simulated-ffr-investigation-using-flow-measurements-in-patient-specific-3d-printed-coronary-phantoms
#6
Lauren Shepard, Kelsey Sommer, Richard Izzo, Alexander Podgorsak, Michael Wilson, Zaid Said, Frank J Rybicki, Dimitrios Mitsouras, Stephen Rudin, Erin Angel, Ciprian N Ionita
PURPOSE: Accurate patient-specific phantoms for device testing or endovascular treatment planning can be 3D printed. We expand the applicability of this approach for cardiovascular disease, in particular, for CT-geometry derived benchtop measurements of Fractional Flow Reserve, the reference standard for determination of significant individual coronary artery atherosclerotic lesions. MATERIALS AND METHODS: Coronary CT Angiography (CTA) images during a single heartbeat were acquired with a 320×0...
February 11, 2017: Proceedings of SPIE
https://www.readbyqxmd.com/read/28649158/implementation-of-material-decomposition-using-an-emccd-and-cmos-based-micro-ct-system
#7
Alexander R Podgorsak, Sv Setlur Nagesh, Daniel R Bednarek, Stephen Rudin, Ciprian N Ionita
This project assessed the effectiveness of using two different detectors to obtain dual-energy (DE) micro-CT data for the carrying out of material decomposition. A micro-CT coupled to either a complementary metal-oxide semiconductor (CMOS) or an electron multiplying CCD (EMCCD) detector was used to acquire image data of a 3D-printed phantom with channels filled with different materials. At any instance, materials such as iohexol contrast agent, water, and platinum were selected to make up the scanned object...
February 11, 2017: Proceedings of SPIE
https://www.readbyqxmd.com/read/28649157/use-of-patient-specific-3d-printed-neurovascular-phantoms-to-evaluate-the-clinical-utility-of-a-high-resolution-x-ray-imager
#8
S V Setlur Nagesh, M Russ, C N Ionita, D Bednarek, S Rudin
Modern 3D printing technology can fabricate vascular phantoms based on an actual human patient with a high degree of precision facilitating a realistic simulation environment for an intervention. We present two experimental setups using 3D printed patient-specific neurovasculature to simulate different disease anatomies. To simulate the human neurovasculature in the Circle of Willis, patient-based phantoms with aneurysms were 3D printed using a Objet Eden 260V printer. Anthropomorphic head phantoms and a human skull combined with acrylic plates simulated human head bone anatomy and x-ray attenuation...
February 11, 2017: Proceedings of SPIE
https://www.readbyqxmd.com/read/28649155/evaluation-of-methods-to-produce-an-image-library-for-automatic-patient-model-localization-for-dose-mapping-during-fluoroscopically-guided-procedures
#9
Josh Kilian-Meneghin, Z Xiong, A Oines, S Rudin, D R Bednarek
The purpose of this work is to evaluate methods for producing a library of 2D-radiographic images to be correlated to clinical images obtained during a fluoroscopically-guided procedure for automated patient-model localization. The localization algorithm will be used to improve the accuracy of the skin-dose map superimposed on the 3D patient-model of the real-time Dose-Tracking-System (DTS). For the library, 2D images were generated from CT datasets of the SK-150 anthropomorphic phantom using two methods: Schmid's 3D-visualization tool and Plastimatch's digitally-reconstructed-radiograph (DRR) code...
February 11, 2017: Proceedings of SPIE
https://www.readbyqxmd.com/read/28648115/complete-thoracolumbar-fracture-dislocation-with-intact-neurologic-function-explanation-of-a-novel-cord-saving-mechanism
#10
Abolfazl Rahimizadeh, Naser Asgari, Ava Rahimizadeh
BACKGROUND: The thoracolumbar junction from T11 to L2 is a common site of injury in which fracture and dislocations are the most prevalent ones occurring at this location. Fracture dislocation is defined as failure of all three columns of the spine with gross displacement. Considering the significant violence necessary to produce fracture dislocations, these injuries are often associated with major neural deficit, with the majority of casualties becoming paraplegic immediately. Preservation of neurological function following complete fracture dislocation is quite rare entity...
June 26, 2017: Journal of Spinal Cord Medicine
https://www.readbyqxmd.com/read/28648002/-application-value-of-whole-brain-3d-artery-spin-labeling-in-diagnosis-of-intracranial-tumors
#11
Q Q Zhao, Q X Yang, G X Xu, Y C Lü, D L Rong, L Liu, R Zhang
Objective: To investigate the perfusion characteristics of arterial spin labeling (ASL) in intracranial tumor and its application value in classification. Methods: The clinical, pathological and imaging data of 44 patients with gliomas confirmed by pathology were analyzed retrospectively, including 9 low grade gliomas, 15 high grade gliomas, 11 cases of meningiomas, 6 cases of neurilemmoma, 3 cases of metastatic tumors.Conventional plain scan, 3D- ASL and MRI dynamic enhanced imaging (DSC-MRI) were performed...
June 20, 2017: Zhonghua Yi Xue za Zhi [Chinese medical journal]
https://www.readbyqxmd.com/read/28647841/anterior-cruciate-ligament-tibial-insertion-site-is-elliptical-or-triangular-shaped-in-healthy-young-adults-high-resolution-3-t-mri-analysis
#12
Yasutaka Tashiro, Gian Andrea Lucidi, Tom Gale, Kanto Nagai, Elmar Herbst, James J Irrgang, Yasuharu Nakashima, William Anderst, Freddie H Fu
PURPOSE: To clarify the morphology of anterior cruciate ligament (ACL) tibial insertion site in healthy young knees using high-resolution 3-T MRI. METHODS: Subjects were 50 ACL-reconstructed patients with a mean age of 21.4 ± 6.8 years. The contralateral healthy knees were scanned using high-resolution 3-T MRI. The tibial insertion sites of the anteromedial (AM) and posterolateral (PL) bundle fibres, and the ACL attachment on the anterior horn of lateral meniscus (AHLM) were segmented from the MR images, and 3D models were reconstructed to evaluate the morphology...
June 24, 2017: Knee Surgery, Sports Traumatology, Arthroscopy: Official Journal of the ESSKA
https://www.readbyqxmd.com/read/28647828/3d-printing-of-severe-hypertrophic-cardiomyopathy-in-a-child-with-rasopathy
#13
N F Johnston, T Prendiville, C J McMahon
We describe the use of 3D printing in conjunction with echocardiography in assessing hypertrophic cardiomyopathy in a boy with Rasopathy. 3D printing may supplement conventional imaging including echocardiography and MRI in the evaluation of hypertrophic cardiomyopathy.
June 25, 2017: Irish Journal of Medical Science
https://www.readbyqxmd.com/read/28647774/automatic-identification-of-coronary-tree-anatomy-in-coronary-computed-tomography-angiography
#14
Qing Cao, Alexander Broersen, Michiel A de Graaf, Pieter H Kitslaar, Guanyu Yang, Arthur J Scholte, Boudewijn P F Lelieveldt, Johan H C Reiber, Jouke Dijkstra
An automatic coronary artery tree labeling algorithm is described to identify the anatomical segments of the extracted centerlines from coronary computed tomography angiography (CCTA) images. This method will facilitate the automatic lesion reporting and risk stratification of cardiovascular disease. Three-dimensional (3D) models for both right dominant (RD) and left dominant (LD) coronary circulations were built. All labels in the model were matched with their possible candidates in the extracted tree to find the optimal labeling result...
June 24, 2017: International Journal of Cardiovascular Imaging
https://www.readbyqxmd.com/read/28647645/adding-dimension-to-cellular-mechanotransduction-advances-in-biomedical-engineering-of-multiaxial-cell-stretch-systems-and-their-application-to-cardiovascular-biomechanics-and-mechano-signaling
#15
REVIEW
O Friedrich, D Schneidereit, Y A Nikolaev, V Nikolova-Krstevski, S Schürmann, A Wirth-Hücking, A L Merten, D Fatkin, B Martinac
Hollow organs (e.g. heart) experience pressure-induced mechanical wall stress sensed by molecular mechano-biosensors, including mechanosensitive ion channels, to translate into intracellular signaling. For direct mechanistic studies, stretch devices to apply defined extensions to cells adhered to elastomeric membranes have stimulated mechanotransduction research. However, most engineered systems only exploit unilateral cellular stretch. In addition, it is often taken for granted that stretch applied by hardware translates 1:1 to the cell membrane...
June 21, 2017: Progress in Biophysics and Molecular Biology
https://www.readbyqxmd.com/read/28647083/the-production-of-3d-tumor-spheroids-for-cancer-drug-discovery
#16
REVIEW
Shilpa Sant, Paul A Johnston
New cancer drug approval rates are ≤5% despite significant investments in cancer research, drug discovery and development. One strategy to improve the rate of success of new cancer drugs transitioning into the clinic would be to more closely align the cellular models used in the early lead discovery with pre-clinical animal models and patient tumors. For solid tumors, this would mandate the development and implementation of three dimensional (3D) in vitro tumor models that more accurately recapitulate human solid tumor architecture and biology...
March 2017: Drug Discovery Today. Technologies
https://www.readbyqxmd.com/read/28646865/development-of-stereo-endoscope-system-with-its-innovative-master-interface-for-continuous-surgical-operation
#17
Myungjoon Kim, Chiwon Lee, Nhayoung Hong, Yoon Jae Kim, Sungwan Kim
BACKGROUND: Although robotic laparoscopic surgery has various benefits when compared with conventional open surgery and minimally invasive surgery, it also has issues to overcome and one of the issues is the discontinuous surgical flow that occurs whenever control is swapped between the endoscope system and the operating robot arm system. This can lead to problems such as collision between surgical instruments, injury to patients, and increased operation time. To achieve continuous surgical operation, a wireless controllable stereo endoscope system is proposed which enables the simultaneous control of the operating robot arm system and the endoscope system...
June 24, 2017: Biomedical Engineering Online
https://www.readbyqxmd.com/read/28646628/focal-liver-lesions-real-time-3-dimensional-contrast-enhanced-ultrasonography-compared-with-2-dimensional-contrast-enhanced-ultrasonography-and-magnetic-resonance-imaging
#18
Jung-Chieh Lee, Kun Yan, San-Kan Lee, Wei Yang, Min-Hua Chen
OBJECTIVES: This study sought to evaluate the application of real-time 3-dimensional (3D) contrast-enhanced ultrasonography (US) to diagnose focal liver lesions and to compare these results with those from 2-dimensional (2D) contrast-enhanced US and contrast-enhanced magnetic resonance imaging (MRI). METHODS: Patients with focal liver lesions were examined by 2D contrast-enhanced US, 3D contrast-enhanced US, and contrast-enhanced MRI for lesion characterization, and biopsies and comprehensive clinical diagnoses served as reference standards...
June 24, 2017: Journal of Ultrasound in Medicine: Official Journal of the American Institute of Ultrasound in Medicine
https://www.readbyqxmd.com/read/28646614/does-breast-mri-background-parenchymal-enhancement-indicate-metabolic-activity-qualitative-and-3d-quantitative-computer-imaging-analysis
#19
Eralda Mema, Victoria L Mango, Xiaotao Guo, Jenika Karcich, Randy Yeh, Ralph T Wynn, Binsheng Zhao, Richard S Ha
PURPOSE: To investigate whether the degree of breast magnetic resonance imaging (MRI) background parenchymal enhancement (BPE) is associated with the amount of breast metabolic activity measured by breast parenchymal uptake (BPU) of 18F-FDG on positron emission tomography / computed tomography (PET/CT). MATERIALS AND METHODS: An Institutional Review Board (IRB)-approved retrospective study was performed. Of 327 patients who underwent preoperative breast MRI from 1/1/12 to 12/31/15, 73 patients had 18F-FDG PET/CT evaluation performed within 1 week of breast MRI and no suspicious findings in the contralateral breast...
June 24, 2017: Journal of Magnetic Resonance Imaging: JMRI
https://www.readbyqxmd.com/read/28646593/mri-assisted-dual-motion-correction-for-myocardial-perfusion-defect-detection-in-pet-imaging
#20
Xinhui Wang, Arman Rahmim, Jing Tang
PURPOSE: Myocardial perfusion (MP) PET imaging is a powerful tool in risk assess-assessment and stratification of patients with coronary artery disease. Involuntary organmotion degrades cardiac PET image resolution while respiratory and/or cardiac gating to freeze the motion leads to noisier reconstructed images due to reduced counts in the gated frames. In this work, we propose an MRI assisted dual motion correction method to compensate for respiratory and cardiac motion in MP PET data and study the impact of dual motion correction on MP defect detection using systematically designed experiments...
June 24, 2017: Medical Physics
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