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International Journal of Computer Assisted Radiology and Surgery

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https://www.readbyqxmd.com/read/28801817/contour-segmentation-of-the-intima-media-and-adventitia-layers-in-intracoronary-oct-images-application-to-fully-automatic-detection-of-healthy-wall-regions
#1
Guillaume Zahnd, Ayla Hoogendoorn, Nicolas Combaret, Antonios Karanasos, Emilie Péry, Laurent Sarry, Pascal Motreff, Wiro Niessen, Evelyn Regar, Gijs van Soest, Frank Gijsen, Theo van Walsum
PURPOSE: Quantitative and automatic analysis of intracoronary optical coherence tomography images is useful and time-saving to assess cardiovascular risk in the clinical arena. METHODS: First, the interfaces of the intima, media, and adventitia layers are segmented, by means of an original front propagation scheme, running in a 4D multi-parametric space, to simultaneously extract three non-crossing contours in the initial cross-sectional image. Second, information resulting from the tentative contours is exploited by a machine learning approach to identify healthy and diseased regions of the arterial wall...
August 11, 2017: International Journal of Computer Assisted Radiology and Surgery
https://www.readbyqxmd.com/read/28801767/experimental-validation-of-predicted-application-accuracies-for-computer-assisted-cas-intraoperative-navigation-with-paired-point-registration
#2
Martina Perwög, Zoltan Bardosi, Wolfgang Freysinger
PURPOSE: The target registration error (TRE) is a crucial parameter to estimate the potential usefulness of computer-assisted navigation intraoperatively. Both image-to-patient registration on base of rigid-body registration and TRE prediction methods are available for spatially isotropic and anisotropic data. This study presents a thorough validation of data obtained in an experimental operating room setting with CT images. METHODS: Optical tracking was used to register a plastic skull, an anatomic specimen, and a volunteer to their respective CT images...
August 11, 2017: International Journal of Computer Assisted Radiology and Surgery
https://www.readbyqxmd.com/read/28795318/a-unified-methodology-based-on-sparse-field-level-sets-and-boosting-algorithms-for-false-positives-reduction-in-lung-nodules-detection
#3
Soudeh Saien, Hamid Abrishami Moghaddam, Mohsen Fathian
PURPOSE: This work aims to develop a unified methodology for the false positives reduction in lung nodules computer-aided detection schemes. METHODS: The 3D region of each detected nodule candidate is first reconstructed using the sparse field method for accurately segmenting the objects. This technique enhances the level set modeling by restricting the computations to a narrow band near the evolving curve. Then, a set of 2D and 3D relevant features are extracted for each segmented candidate...
August 9, 2017: International Journal of Computer Assisted Radiology and Surgery
https://www.readbyqxmd.com/read/28785960/spine-labeling-in-mri-via-regularized-distribution-matching
#4
Seyed-Parsa Hojjat, Ismail Ayed, Gregory J Garvin, Kumaradevan Punithakumar
PURPOSE: This study investigates an efficient (nearly real-time) two-stage spine labeling algorithm that removes the need for an external training while being applicable to different types of MRI data and acquisition protocols. METHODS: Based solely on the image being labeled (i.e., we do not use training data), the first stage aims at detecting potential vertebra candidates following the optimization of a functional containing two terms: (i) a distribution-matching term that encodes contextual information about the vertebrae via a density model learned from a very simple user input, which amounts to a point (mouse click) on a predefined vertebra; and (ii) a regularization constraint, which penalizes isolated candidates in the solution...
August 7, 2017: International Journal of Computer Assisted Radiology and Surgery
https://www.readbyqxmd.com/read/28785959/the-computer-aided-parallel-external-fixator-for-complex-lower-limb-deformity-correction
#5
Mengting Wei, Jianwen Chen, Yue Guo, Hao Sun
PURPOSE: Since parameters of the parallel external fixator are difficult to measure and calculate in real applications, this study developed computer software that can help the doctor measure parameters using digital technology and generate an electronic prescription for deformity correction. METHODS: According to Paley's deformity measurement method, we provided digital measurement techniques. In addition, we proposed an deformity correction algorithm to calculate the elongations of the six struts and developed a electronic prescription software...
August 7, 2017: International Journal of Computer Assisted Radiology and Surgery
https://www.readbyqxmd.com/read/28779275/augmented-reality-surgical-navigation-with-ultrasound-assisted-registration-for-pedicle-screw-placement-a-pilot-study
#6
Longfei Ma, Zhe Zhao, Fang Chen, Boyu Zhang, Ligong Fu, Hongen Liao
PURPOSE: We present a novel augmented reality (AR) surgical navigation system based on ultrasound-assisted registration for pedicle screw placement. This system provides the clinically desired targeting accuracy and reduces radiation exposure. METHODS: Ultrasound (US) is used to perform registration between preoperative computed tomography (CT) images and patient, and the registration is performed by least-squares fitting of these two three-dimensional (3D) point sets of anatomical landmarks taken from US and CT images...
August 5, 2017: International Journal of Computer Assisted Radiology and Surgery
https://www.readbyqxmd.com/read/28766177/using-needle-orientation-sensing-as-surrogate-signal-for-respiratory-motion-estimation-in-percutaneous-interventions
#7
Momen Abayazid, Takahisa Kato, Stuart G Silverman, Nobuhiko Hata
PURPOSE: To develop and evaluate an approach to estimate the respiratory-induced motion of lesions in the chest and abdomen. MATERIALS AND METHODS: The proposed approach uses the motion of an initial reference needle inserted into a moving organ to estimate the lesion (target) displacement that is caused by respiration. The needles position is measured using an inertial measurement unit (IMU) sensor externally attached to the hub of an initially placed reference needle...
August 1, 2017: International Journal of Computer Assisted Radiology and Surgery
https://www.readbyqxmd.com/read/28762196/ultrasound-image-based-thyroid-nodule-automatic-segmentation-using-convolutional-neural-networks
#8
Jinlian Ma, Fa Wu, Tian'an Jiang, Qiyu Zhao, Dexing Kong
PURPOSE: Delineation of thyroid nodule boundaries from ultrasound images plays an important role in calculation of clinical indices and diagnosis of thyroid diseases. However, it is challenging for accurate and automatic segmentation of thyroid nodules because of their heterogeneous appearance and components similar to the background. In this study, we employ a deep convolutional neural network (CNN) to automatically segment thyroid nodules from ultrasound images. METHODS: Our CNN-based method formulates a thyroid nodule segmentation problem as a patch classification task, where the relationship among patches is ignored...
July 31, 2017: International Journal of Computer Assisted Radiology and Surgery
https://www.readbyqxmd.com/read/28755036/a-pilot-study-for-segmentation-of-pharyngeal-and-sino-nasal-airway-subregions-by-automatic-contour-initialization
#9
Bala Chakravarthy Neelapu, Om Prakash Kharbanda, Viren Sardana, Abhishek Gupta, Srikanth Vasamsetti, Rajiv Balachandran, Shailendra Singh Rana, Harish Kumar Sardana
PURPOSE: The objective of the present study is to put forward a novel automatic segmentation algorithm to segment pharyngeal and sino-nasal airway subregions on 3D CBCT imaging datasets. METHODS: A fully automatic segmentation of sino-nasal and pharyngeal airway subregions was implemented in MATLAB programing environment. The novelty of the algorithm is automatic initialization of contours in upper airway subregions. The algorithm is based on boundary definitions of the human anatomy along with shape constraints with an automatic initialization of contours to develop a complete algorithm which has a potential to enhance utility at clinical level...
July 28, 2017: International Journal of Computer Assisted Radiology and Surgery
https://www.readbyqxmd.com/read/28744837/guest-editorial-of-the-ijcars-miccai-2016-special-issue
#10
EDITORIAL
Sebastien Ourselin, Mert R Sabuncu, William Wells, Leo Joskowicz, Gozde Unal, Andreas Maier
No abstract text is available yet for this article.
July 25, 2017: International Journal of Computer Assisted Radiology and Surgery
https://www.readbyqxmd.com/read/28733907/multiple-intracranial-aneurysms-a-direct-hemodynamic-comparison-between-ruptured-and-unruptured-vessel-malformations
#11
Philipp Berg, Oliver Beuing
PURPOSE: Despite numerous studies addressing the rupture risk of intracranial aneurysms that have been published, the assessment thereof still remains challenging. Image-based simulations enable a precise prediction of patient-specific blood flow information. However, those approaches normally consider only small segments of the complete cerebral vasculature. METHODS: To test the validity of the consideration of single aneurysms in one computational setup, domains of the complete anterior and posterior circulations with multiple intracranial aneurysms (MIA) were simulated...
July 21, 2017: International Journal of Computer Assisted Radiology and Surgery
https://www.readbyqxmd.com/read/28726117/applying-a-new-bilateral-mammographic-density-segmentation-method-to-improve-accuracy-of-breast-cancer-risk-prediction
#12
Shiju Yan, Yunzhi Wang, Faranak Aghaei, Yuchen Qiu, Bin Zheng
PURPOSE: How to optimally detect bilateral mammographic asymmetry and improve risk prediction accuracy remains a difficult and unsolved issue. Our aim was to find an effective mammographic density segmentation method to improve accuracy of breast cancer risk prediction. METHODS: A dataset including 168 negative mammography screening cases was used. We applied a mutual threshold to bilateral mammograms of left and right breasts to segment the dense breast regions...
July 19, 2017: International Journal of Computer Assisted Radiology and Surgery
https://www.readbyqxmd.com/read/28726116/a-computationally-efficient-method-for-hand-eye-calibration
#13
Zhiqiang Zhang, Lin Zhang, Guang-Zhong Yang
PURPOSE: Surgical robots with cooperative control and semiautonomous features have shown increasing clinical potential, particularly for repetitive tasks under imaging and vision guidance. Effective performance of an autonomous task requires accurate hand-eye calibration so that the transformation between the robot coordinate frame and the camera coordinates is well defined. In practice, due to changes in surgical instruments, online hand-eye calibration must be performed regularly. In order to ensure seamless execution of the surgical procedure without affecting the normal surgical workflow, it is important to derive fast and efficient hand-eye calibration methods...
July 19, 2017: International Journal of Computer Assisted Radiology and Surgery
https://www.readbyqxmd.com/read/28718001/a-new-device-for-fiducial-registration-of-image-guided-navigation-system-for-liver-rfa
#14
Nobutaka Doba, Hiroyuki Fukuda, Kazushi Numata, Yoshiteru Hao, Kouji Hara, Akito Nozaki, Masaaki Kondo, Makoto Chuma, Katsuaki Tanaka, Shigeo Takebayashi, Norihiro Koizumi, Akira Kobayashi, Junichi Tokuda, Shin Maeda
PURPOSE: Radiofrequency ablation for liver tumors (liver RFA) is widely performed under ultrasound guidance. However, discriminating between the tumor and the needle is often difficult because of cavitation caused by RFA-induced coagulation. An unclear ultrasound image can lead to complications and tumor residue. Therefore, image-guided navigation systems based on fiducial registration have been developed. Fiducial points are usually set on a patient's skin. But the use of internal fiducial points can improve the accuracy of navigation...
July 17, 2017: International Journal of Computer Assisted Radiology and Surgery
https://www.readbyqxmd.com/read/28710548/retrospective-evaluation-and-seeg-trajectory-analysis-for-interactive-multi-trajectory-planner-assistant
#15
Davide Scorza, Elena De Momi, Lisa Plaino, Gaetano Amoroso, Gabriele Arnulfo, Massimo Narizzano, Luis Kabongo, Francesco Cardinale
PURPOSE: Focal epilepsy is a neurological disease that can be surgically treated by removing area of the brain generating the seizures. The stereotactic electroencephalography (SEEG) procedure allows patient brain activity to be recorded in order to localize the onset of seizures through the placement of intracranial electrodes. The planning phase can be cumbersome and very time consuming, and no quantitative information is provided to neurosurgeons regarding the safety and efficacy of their trajectories...
July 14, 2017: International Journal of Computer Assisted Radiology and Surgery
https://www.readbyqxmd.com/read/28707212/automatic-evaluation-of-vessel-diameter-variation-from-2d-x-ray-angiography
#16
Faten M'hiri, Luc Duong, Christian Desrosiers, Nagib Dahdah, Joaquim Miró, Mohamed Cheriet
PURPOSE: Early detection of blood vessel pathologies can be made through the evaluation of functional and structural abnormalities in the arteries, including the arterial distensibility measure. We propose a feasibility study on computing arterial distensibility automatically from monoplane 2D X-ray sequences for both small arteries (such as coronary arteries) and larger arteries (such as the aorta). METHODS: To compute the distensibility measure, three steps were developed: First, the segment of an artery is extracted using our graph-based segmentation method...
July 13, 2017: International Journal of Computer Assisted Radiology and Surgery
https://www.readbyqxmd.com/read/28707211/high-accuracy-drilling-with-an-image-guided-light-weight-robot-autonomous-versus-intuitive-feed-control
#17
Sebastian Tauscher, Alexander Fuchs, Fabian Baier, Lüder A Kahrs, Tobias Ortmaier
PURPOSE: Assistance of robotic systems in the operating room promises higher accuracy and, hence, demanding surgical interventions become realisable (e.g. the direct cochlear access). Additionally, an intuitive user interface is crucial for the use of robots in surgery. Torque sensors in the joints can be employed for intuitive interaction concepts. Regarding the accuracy, they lead to a lower structural stiffness and, thus, to an additional error source. The aim of this contribution is to examine, if an accuracy needed for demanding interventions can be achieved by such a system or not...
July 13, 2017: International Journal of Computer Assisted Radiology and Surgery
https://www.readbyqxmd.com/read/28702927/3d-boolean-operations-in-virtual-surgical-planning
#18
Jerome Charton, Mathieu Laurentjoye, Youngjun Kim
PURPOSE: Boolean operations in computer-aided design or computer graphics are a set of operations (e.g. intersection, union, subtraction) between two objects (e.g. a patient model and an implant model) that are important in performing accurate and reproducible virtual surgical planning. This requires accurate and robust techniques that can handle various types of data, such as a surface extracted from volumetric data, synthetic models, and 3D scan data. METHODS: This article compares the performance of the proposed method (Boolean operations by a robust, exact, and simple method between two colliding shells (BORES)) and an existing method based on the Visualization Toolkit (VTK)...
July 12, 2017: International Journal of Computer Assisted Radiology and Surgery
https://www.readbyqxmd.com/read/28695480/finger-attachment-device-for-the-feedback-of-gripping-and-pulling-force-in-a-manipulating-system-for-brain-tumor-resection
#19
Hiroyuki Chinbe, Takeshi Yoneyama, Tetsuyou Watanabe, Katsuyoshi Miyashita, Mitsutoshi Nakada
PURPOSE: Development and evaluation of an effective attachment device for a bilateral brain tumor resection robotic surgery system based on the sensory performance of the human index finger in order to precisely detect gripping- and pulling-force feedback. METHODS: First, a basic test was conducted to investigate the performance of the human index finger in the gripping- and pulling-force feedback system. Based on the test result, a new finger-attachment device was designed and constructed...
July 10, 2017: International Journal of Computer Assisted Radiology and Surgery
https://www.readbyqxmd.com/read/28695479/initial-experience-using-a-robotic-driven-laparoscopic-needle-holder-with-ergonomic-handle-assessment-of-surgeons-task-performance-and-ergonomics
#20
Juan A Sánchez-Margallo, Francisco M Sánchez-Margallo
PURPOSE: The objective of this study is to assess the surgeons' performance and ergonomics during the use of a robotic-driven needle holder in laparoscopic suturing tasks. METHODS: Six right-handed laparoscopic surgeons with different levels of experience took part in this study. Participants performed a set of three different intracorporeal suturing tasks organized in ten trials during a period of five weeks. Surgeons used both conventional (Conv) and robotic (Rob) laparoscopic needle holders...
July 10, 2017: International Journal of Computer Assisted Radiology and Surgery
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