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International Journal of Computer Assisted Radiology and Surgery

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https://www.readbyqxmd.com/read/30014167/perspective-pinhole-model-with-planar-source-for-augmented-reality-surgical-navigation-based-on-c-arm-imaging
#1
Ho-Gun Ha, Sangseo Jeon, Seongpung Lee, Hyunseok Choi, Jaesung Hong
PURPOSE: For augmented reality surgical navigation based on C-arm imaging, accuracy of the overlaid augmented reality onto the X-ray image is imperative. However, overlay displacement is generated when a conventional pinhole model describing a geometric relationship of a normal camera is adopted for C-arm calibration. Thus, a modified model for C-arm calibration is proposed to reduce this displacement, which is essential for accurate surgical navigation. METHOD: Based on the analysis of displacement pattern generated for three-dimensional objects, we assumed that displacement originated by moving the X-ray source position according to the depth...
July 16, 2018: International Journal of Computer Assisted Radiology and Surgery
https://www.readbyqxmd.com/read/30008058/development-of-a-modeling-pipeline-for-the-prediction-of-hemodynamic-outcome-after-virtual-mitral-valve-repair-using-image-based-cfd
#2
Katharina Vellguth, Jan Brüning, Leonid Goubergrits, Lennart Tautz, Anja Hennemuth, Ulrich Kertzscher, Franziska Degener, Marcus Kelm, Simon Sündermann, Titus Kuehne
PURPOSE: Severe mitral valve regurgitation can either be treated by a replacement or a repair of the valve. The latter is recommended due to lower perioperative mortality and better long-term survival. On the other hand, recurrence rates after mitral valve repair are high compared to those after replacements and the repair intervention can cause induced mitral valve stenosis. So far, there are no methods to predict the hemodynamic outcome of a chosen treatment or to compare different treatment options in advance...
July 14, 2018: International Journal of Computer Assisted Radiology and Surgery
https://www.readbyqxmd.com/read/30006820/toward-a-standard-ontology-of-surgical-process-models
#3
Bernard Gibaud, Germain Forestier, Carolin Feldmann, Giancarlo Ferrigno, Paulo Gonçalves, Tamás Haidegger, Chantal Julliard, Darko Katić, Hannes Kenngott, Lena Maier-Hein, Keno März, Elena de Momi, Dénes Ákos Nagy, Hirenkumar Nakawala, Juliane Neumann, Thomas Neumuth, Javier Rojas Balderrama, Stefanie Speidel, Martin Wagner, Pierre Jannin
PURPOSE: The development of common ontologies has recently been identified as one of the key challenges in the emerging field of surgical data science (SDS). However, past and existing initiatives in the domain of surgery have mainly been focussing on individual groups and failed to achieve widespread international acceptance by the research community. To address this challenge, the authors of this paper launched a European initiative-OntoSPM Collaborative Action-with the goal of establishing a framework for joint development of ontologies in the field of SDS...
July 13, 2018: International Journal of Computer Assisted Radiology and Surgery
https://www.readbyqxmd.com/read/29998400/long-term-experience-with-setup-and-implementation-of-an-ihe-based-image-management-and-distribution-system-in-intersectoral-clinical-routine
#4
F Schwind, H Münch, A Schröter, R Brandner, U Kutscha, A Brandner, O Heinze, B Bergh, U Engelmann
PURPOSE: Sharing of medical data is crucial for the proper treatment of patients as it could reduce the risk of duplicated medical tests and speed up the care process if all documents are readily available. Despite great technical progress, sharing patient data while maintaining full control over the process in an intersectoral (in Germany, this describes the different actors in the healthcare system consisting of clinic, ambulatory care, etc.) setting remains a particular challenge. This paper focuses on the successful implementation of a privacy compliant, standards-based image-management component of a personal electronic health record...
July 11, 2018: International Journal of Computer Assisted Radiology and Surgery
https://www.readbyqxmd.com/read/29987741/robust-extraction-for-low-contrast-liver-tumors-using-modified-adaptive-likelihood-estimation
#5
Qing Huang, Hui Ding, Xiaodong Wang, Guangzhi Wang
PURPOSE: Liver tumor extraction is essential for liver ablation surgery planning and treatment. For accurate and robust tumor segmentation, we propose a semiautomatic method using adaptive likelihood classification with modified likelihood model. METHODS: First, a minimal ellipse (or quasi-ellipsoid) that encloses a liver tumor is generated for initialization. Then, a hybrid intensity likelihood modification based on nonparametric density estimation is proposed to enhance local likelihood contrast and reduce its inhomogeneity...
July 10, 2018: International Journal of Computer Assisted Radiology and Surgery
https://www.readbyqxmd.com/read/29982903/myocardium-segmentation-from-de-mri-with-guided-random-walks-and-sparse-shape-representation
#6
Jie Liu, Xiahai Zhuang, Hongzhi Xie, Shuyang Zhang, Lixu Gu
PURPOSE: For patients with myocardial infarction (MI), delayed enhancement (DE) cardiovascular magnetic resonance imaging (MRI) is a sensitive and well-validated technique for the detection and visualization of MI. The myocardium viability assessment with DE MRI is important in diagnosis and treatment management, where myocardium segmentation is a prerequisite. However, few academic works have focused on automated myocardium segmentation from DE images. In this study, we aim to develop an automatic myocardium segmentation algorithm that targets DE images...
July 7, 2018: International Journal of Computer Assisted Radiology and Surgery
https://www.readbyqxmd.com/read/29971667/correction-to-rf-ablation-pattern-shaping-employing-switching-channels-of-dual-bipolar-needle-electrodes-ex-vivo-results
#7
Jens Ziegle, Chloé Audigier, Johannes Krug, Ghazanfar Ali, Younsu Kim, Emad M Boctor, Michael Friebe
The original version of this article was published without funding note. The funding note is given below.
July 3, 2018: International Journal of Computer Assisted Radiology and Surgery
https://www.readbyqxmd.com/read/29968113/clinical-use-of-an-opto-nuclear-probe-for-hybrid-sentinel-node-biopsy-guidance-first-results
#8
Sergi Vidal-Sicart, Antonio Seva, Francisco Campos, Núria Sánchez, Immaculada Alonso, Jaume Pahisa, Xavier Caparrós, Andrés Perissinotti, Pilar Paredes, Fijs W van Leeuwen
INTRODUCTION: Guidelines advocate the use of combined detection techniques to achieve optimal results for sentinel node (SN) biopsy. The fluorescent and radioactive (dual-) tracer ICG-99m Tc-nanocolloid has been shown to facilitate SN biopsy in several indications. It was reported that an opto-nuclear probe permitted the detection of near-infrared fluorescence and gamma-rays. The aim of the current study was to evaluate this device in a large patient group and to test it in both open and laparoscopic surgery implications...
July 2, 2018: International Journal of Computer Assisted Radiology and Surgery
https://www.readbyqxmd.com/read/29951938/towards-computer-assisted-ttts-laser-ablation-detection-for-workflow-segmentation-from-fetoscopic-video
#9
Francisco Vasconcelos, Patrick Brandão, Tom Vercauteren, Sebastien Ourselin, Jan Deprest, Donald Peebles, Danail Stoyanov
PURPOSE: Intrauterine foetal surgery is the treatment option for several congenital malformations. For twin-to-twin transfusion syndrome (TTTS), interventions involve the use of laser fibre to ablate vessels in a shared placenta. The procedure presents a number of challenges for the surgeon, and computer-assisted technologies can potentially be a significant support. Vision-based sensing is the primary source of information from the intrauterine environment, and hence, vision approaches present an appealing approach for extracting higher level information from the surgical site...
June 27, 2018: International Journal of Computer Assisted Radiology and Surgery
https://www.readbyqxmd.com/read/29943226/a-radiation-free-mixed-reality-training-environment-and-assessment-concept-for-c-arm-based-surgery
#10
Philipp Stefan, Séverine Habert, Alexander Winkler, Marc Lazarovici, Julian Fürmetz, Ulrich Eck, Nassir Navab
PURPOSE: The discrepancy of continuously decreasing opportunities for clinical training and assessment and the increasing complexity of interventions in surgery has led to the development of different training and assessment options like anatomical models, computer-based simulators or cadaver trainings. However, trainees, following training, assessment and ultimately performing patient treatment, still face a steep learning curve. METHODS: To address this problem for C-arm-based surgery, we introduce a realistic radiation-free simulation system that combines patient-based 3D printed anatomy and simulated X-ray imaging using a physical C-arm...
June 25, 2018: International Journal of Computer Assisted Radiology and Surgery
https://www.readbyqxmd.com/read/29934792/head-mounted-display-augmented-reality-to-guide-pedicle-screw-placement-utilizing-computed-tomography
#11
Jacob T Gibby, Samuel A Swenson, Steve Cvetko, Raj Rao, Ramin Javan
PURPOSE: Augmented reality has potential to enhance surgical navigation and visualization. We determined whether head-mounted display augmented reality (HMD-AR) with superimposed computed tomography (CT) data could allow the wearer to percutaneously guide pedicle screw placement in an opaque lumbar model with no real-time fluoroscopic guidance. METHODS: CT imaging was obtained of a phantom composed of L1-L3 Sawbones vertebrae in opaque silicone. Preprocedural planning was performed by creating virtual trajectories of appropriate angle and depth for ideal approach into the pedicle, and these data were integrated into the Microsoft HoloLens using the Novarad OpenSight application allowing the user to view the virtual trajectory guides and CT images superimposed on the phantom in two and three dimensions...
June 22, 2018: International Journal of Computer Assisted Radiology and Surgery
https://www.readbyqxmd.com/read/29934791/dual-room-ct-with-a-sliding-gantry-for-intraoperative-imaging-feasibility-and-workflow-analysis-of-an-interdisciplinary-concept
#12
Markus Lenski, Johann Hofereiter, Nicole Terpolilli, Torleif Sandner, Stefan Zausinger, Jörg-Christian Tonn, Friedrich-Wilhelm Kreth, Christian Schichor
PURPOSE: Currently, intraoperative computed tomography (iCT) is a scarcely used technique in neurosurgery. It remains unclear whether this phenomenon is explained by unfavorable iCT-related workflows and/or a limited number of indications. We here analyzed workflows of an installed dual-room iCT (DR-iCT) as compared to surgical procedures lacking iCT. We compared infection rates, utilizations rates, and the spectrum of indications of DR-iCT with that of a previously used single-room iCT...
June 22, 2018: International Journal of Computer Assisted Radiology and Surgery
https://www.readbyqxmd.com/read/29931410/comparison-of-the-application-of-b-mode-and-strain-elastography-ultrasound-in-the-estimation-of-lymph-node-metastasis-of-papillary-thyroid-carcinoma-based-on-a-radiomics-approach
#13
Tongtong Liu, Xifeng Ge, Jinhua Yu, Yi Guo, Yuanyuan Wang, Wenping Wang, Ligang Cui
PURPOSE: B-mode ultrasound (B-US) and strain elastography ultrasound (SE-US) images have a potential to distinguish thyroid tumor with different lymph node (LN) status. The purpose of our study is to investigate whether the application of multi-modality images including B-US and SE-US can improve the discriminability of thyroid tumor with LN metastasis based on a radiomics approach. METHODS: Ultrasound (US) images including B-US and SE-US images of 75 papillary thyroid carcinoma (PTC) cases were retrospectively collected...
June 21, 2018: International Journal of Computer Assisted Radiology and Surgery
https://www.readbyqxmd.com/read/29923071/correction-to-tomosynthesis-implementation-with-adaptive-online-calibration-on-clinical-c-arm-systems
#14
Khanlian Chung, Lothar R Schad, Frank G Zöllner
The original version of this article unfortunately contained a mistake in table 2.
June 19, 2018: International Journal of Computer Assisted Radiology and Surgery
https://www.readbyqxmd.com/read/29916062/3d-surface-voxel-tracing-corrector-for-accurate-bone-segmentation
#15
Haoyan Guo, Sicong Song, Jinke Wang, Maozu Guo, Yuanzhi Cheng, Yadong Wang, Shinichi Tamura
PURPOSE: For extremely close bones, their boundaries are weak and diffused due to strong interaction between adjacent surfaces. These factors prevent the accurate segmentation of bone structure. To alleviate these difficulties, we propose an automatic method for accurate bone segmentation. The method is based on a consideration of the 3D surface normal direction, which is used to detect the bone boundary in 3D CT images. METHODS: Our segmentation method is divided into three main stages...
June 18, 2018: International Journal of Computer Assisted Radiology and Surgery
https://www.readbyqxmd.com/read/29916061/eye-tracker-accuracy-quantitative-evaluation-of-the-invisible-eye-center-location
#16
Stephan Wyder, Philippe C Cattin
PURPOSE: We present a new method to evaluate the accuracy of an eye tracker-based eye localization system. Measuring the accuracy of an eye tracker's primary intention, the estimated point of gaze, is usually done with volunteers and a set of fixation points used as ground truth. However, verifying the accuracy of the location estimate of a volunteer's eye center in 3D space is not easily possible. This is because the eye center, the center of corneal curvature, is an intangible point...
June 18, 2018: International Journal of Computer Assisted Radiology and Surgery
https://www.readbyqxmd.com/read/29909528/accuracy-of-computer-aided-design-models-of-the-jaws-produced-using-ultra-low-mdct-doses-and-asir-and-mbir
#17
Asma'a A Al-Ekrish, Sara A Alfadda, Wadea Ameen, Romed Hörmann, Wolfgang Puelacher, Gerlig Widmann
PURPOSE: To compare the surface of computer-aided design (CAD) models of the maxilla produced using ultra-low MDCT doses combined with filtered backprojection (FBP), adaptive statistical iterative reconstruction (ASIR) and model-based iterative reconstruction (MBIR) reconstruction techniques with that produced from a standard dose/FBP protocol. METHODS: A cadaveric completely edentulous maxilla was imaged using a standard dose protocol (CTDIvol: 29.4 mGy) and FBP, in addition to 5 low dose test protocols (LD1-5) (CTDIvol: 4...
June 16, 2018: International Journal of Computer Assisted Radiology and Surgery
https://www.readbyqxmd.com/read/29948847/correction-to-radiation-exposure-for-intraoperative-3d-scans-in-a-hybrid-operating-room-how-to-reduce-radiation-exposure-for-the-surgical-team
#18
K Schuetze, M Kraus, A Eickhoff, F Gebhard, P H Richter
The original version of this article unfortunately contained a mistake. In abstract, results section should read.
June 15, 2018: International Journal of Computer Assisted Radiology and Surgery
https://www.readbyqxmd.com/read/29948846/peripheral-bronchial-identification-on-chest-ct-using-unsupervised-machine-learning
#19
Daniel A Moses, Laughlin Dawes, Claude Sammut, Tatjana Zrimec
PURPOSE: To automatically identify small- to medium-diameter bronchial segments distributed throughout the lungs. METHODS: We segment the peripheral pulmonary vascular tree and construct cross-sectional images perpendicular to the lung vasculature. The bronchi running with pulmonary arteries appear as concentric rings, and potential center points that lie within the bronchi are identified by looking for circles (using the circular Hough transform) and rings (using a novel variable ring filter)...
June 13, 2018: International Journal of Computer Assisted Radiology and Surgery
https://www.readbyqxmd.com/read/29948845/context-aware-decision-support-in-neurosurgical-oncology-based-on-an-efficient-classification-of-endomicroscopic-data
#20
Yachun Li, Patra Charalampaki, Yong Liu, Guang-Zhong Yang, Stamatia Giannarou
PURPOSE: Probe-based confocal laser endomicroscopy (pCLE) enables in vivo, in situ tissue characterisation without changes in the surgical setting and simplifies the oncological surgical workflow. The potential of this technique in identifying residual cancer tissue and improving resection rates of brain tumours has been recently verified in pilot studies. The interpretation of endomicroscopic information is challenging, particularly for surgeons who do not themselves routinely review histopathology...
June 13, 2018: International Journal of Computer Assisted Radiology and Surgery
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