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International Journal of Computer Assisted Radiology and Surgery

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https://www.readbyqxmd.com/read/28432489/design-development-and-clinical-validation-of-computer-aided-surgical-simulation-system-for-streamlined-orthognathic-surgical-planning
#1
REVIEW
Peng Yuan, Huaming Mai, Jianfu Li, Dennis Chun-Yu Ho, Yingying Lai, Siting Liu, Daeseung Kim, Zixiang Xiong, David M Alfi, John F Teichgraeber, Jaime Gateno, James J Xia
PURPOSE: There are many proven problems associated with traditional surgical planning methods for orthognathic surgery. To address these problems, we developed a computer-aided surgical simulation (CASS) system, the AnatomicAligner, to plan orthognathic surgery following our streamlined clinical protocol. METHODS: The system includes six modules: image segmentation and three-dimensional (3D) reconstruction, registration and reorientation of models to neutral head posture, 3D cephalometric analysis, virtual osteotomy, surgical simulation, and surgical splint generation...
April 21, 2017: International Journal of Computer Assisted Radiology and Surgery
https://www.readbyqxmd.com/read/28432488/editorial-for-clinical-investigations-toward-the-vision-and-spirit-of-cars-with-innovative-clinical-investigations
#2
EDITORIAL
Heinz U Lemke
No abstract text is available yet for this article.
April 21, 2017: International Journal of Computer Assisted Radiology and Surgery
https://www.readbyqxmd.com/read/28425030/hand-eye-calibration-for-surgical-cameras-a-procrustean-perspective-n-point-solution
#3
Isabella Morgan, Uditha Jayarathne, Adam Rankin, Terry M Peters, Elvis C S Chen
PURPOSE: Surgical cameras are prevalent in modern operating theatres often used as surrogates for direct vision. A surgical navigational system is a useful adjunct, but requires an accurate "hand-eye" calibration to determine the geometrical relationship between the surgical camera and tracking markers. METHODS: Using a tracked ball-tip stylus, we formulated hand-eye calibration as a Perspective-n-Point problem, which can be solved efficiently and accurately using as few as 15 measurements...
April 19, 2017: International Journal of Computer Assisted Radiology and Surgery
https://www.readbyqxmd.com/read/28421319/inferior-vena-cava-segmentation-with-parameter-propagation-and-graph-cut
#4
Zixu Yan, Feng Chen, Fa Wu, Dexing Kong
PURPOSE: The inferior vena cava (IVC) is one of the vital veins inside the human body. Accurate segmentation of the IVC from contrast-enhanced CT images is of great importance. This extraction not only helps the physician understand its quantitative features such as blood flow and volume, but also it is helpful during the hepatic preoperative planning. However, manual delineation of the IVC is time-consuming and poorly reproducible. METHODS: In this paper, we propose a novel method to segment the IVC with minimal user interaction...
April 18, 2017: International Journal of Computer Assisted Radiology and Surgery
https://www.readbyqxmd.com/read/28401399/intelligent-viewpoint-selection-for-efficient-ct-to-video-registration-in-laparoscopic-liver-surgery
#5
Maria R Robu, Philip Edwards, João Ramalhinho, Stephen Thompson, Brian Davidson, David Hawkes, Danail Stoyanov, Matthew J Clarkson
PURPOSE: Minimally invasive surgery offers advantages over open surgery due to a shorter recovery time, less pain and trauma for the patient. However, inherent challenges such as lack of tactile feedback and difficulty in controlling bleeding lower the percentage of suitable cases. Augmented reality can show a better visualisation of sub-surface structures and tumour locations by fusing pre-operative CT data with real-time laparoscopic video. Such augmented reality visualisation requires a fast and robust video to CT registration that minimises interruption to the surgical procedure...
April 11, 2017: International Journal of Computer Assisted Radiology and Surgery
https://www.readbyqxmd.com/read/28397111/gaze-contingent-perceptually-enabled-interactions-in-the-operating-theatre
#6
Alexandros A Kogkas, Ara Darzi, George P Mylonas
PURPOSE: Improved surgical outcome and patient safety in the operating theatre are constant challenges. We hypothesise that a framework that collects and utilises information -especially perceptually enabled ones-from multiple sources, could help to meet the above goals. This paper presents some core functionalities of a wider low-cost framework under development that allows perceptually enabled interaction within the surgical environment. METHODS: The synergy of wearable eye-tracking and advanced computer vision methodologies, such as SLAM, is exploited...
April 10, 2017: International Journal of Computer Assisted Radiology and Surgery
https://www.readbyqxmd.com/read/28393299/blood-flow-induced-physically-based-guidewire-simulation-for-vascular-intervention-training
#7
Jiayin Cai, Hongzhi Xie, Shuyang Zhang, Lixu Gu
PURPOSE: A realistic guidewire behavior simulation is a vital component of a virtual vascular intervention system. Such systems are a safe, low-cost means of establishing a training environment to help inexperienced surgeons develop their intervention skills. Previous attempts to simulate the complex movement of a guidewire inside blood vessels have rarely considered the influence of blood flow. In this paper, we address this problem by integrating blood flow analysis and propose a novel guidewire simulation model...
April 9, 2017: International Journal of Computer Assisted Radiology and Surgery
https://www.readbyqxmd.com/read/28391583/3d-intra-operative-ultrasound-and-mr-image-guidance-pursuing-an-ultrasound-based-management-of-brainshift-to-enhance-neuronavigation
#8
Marco Riva, Christoph Hennersperger, Fausto Milletari, Amin Katouzian, Federico Pessina, Benjamin Gutierrez-Becker, Antonella Castellano, Nassir Navab, Lorenzo Bello
BACKGROUND: Brainshift is still a major issue in neuronavigation. Incorporating intra-operative ultrasound (iUS) with advanced registration algorithms within the surgical workflow is regarded as a promising approach for a better understanding and management of brainshift. This work is intended to (1) provide three-dimensional (3D) ultrasound reconstructions specifically for brain imaging in order to detect brainshift observed intra-operatively, (2) evaluate a novel iterative intra-operative ultrasound-based deformation correction framework, and (3) validate the performance of the proposed image-registration-based deformation estimation in a clinical environment...
April 8, 2017: International Journal of Computer Assisted Radiology and Surgery
https://www.readbyqxmd.com/read/28391582/guest-editorial-for-the-ijcars-special-issue-on-jamit-2015-and-2016
#9
EDITORIAL
Akinobu Shimizu, Yoshinobu Sato, Kiyonari Inamura
No abstract text is available yet for this article.
April 8, 2017: International Journal of Computer Assisted Radiology and Surgery
https://www.readbyqxmd.com/read/28386757/contact-less-stylus-for-surgical-navigation-registration-without-digitization
#10
Elvis C S Chen, Burton Ma, Terry M Peters
PURPOSE: We present a laser-based, contact-less, stylus for the purpose of fiducial registration and digitization in the context of surgical navigation. METHODS: We augmented a laser pointer with a spatial measurement device and used the laser beam as a means to locate a fiducial in 3D space. We developed a method for calibrating the orientation of the laser beam with respect to its attached tracking target. Digitization of a fiducial was formulated as a line intersection problem, and registration was formulated as a point-to-line registration problem...
April 6, 2017: International Journal of Computer Assisted Radiology and Surgery
https://www.readbyqxmd.com/read/28365906/error-range-in-proximal-femoral-osteotomy-using-computer-tomography-based-navigation
#11
Masaki Takao, Takashi Sakai, Hidetoshi Hamada, Nobuhiko Sugano
PURPOSE  : The purpose of this preliminary study was to determine the error range compared with preoperative plans in proximal femoral osteotomy conducted using a computed tomography (CT)-based navigation system. METHODS  : Four patients (four hips) underwent transtrochanteric rotational osteotomy (TRO), and three patients (four hips) underwent curved varus osteotomy (CVO) using CT-based navigation. Volume registration of pre- and postoperative CT was performed for error assessment. RESULTS  : In TRO, the mean osteotomy angle error was [Formula: see text] (range [Formula: see text]) in the valgus direction and [Formula: see text] (range [Formula: see text]) in the retroversion direction...
April 1, 2017: International Journal of Computer Assisted Radiology and Surgery
https://www.readbyqxmd.com/read/28361325/intravascular-endoscopy-improvement-through-narrow-band-imaging
#12
Axel Boese, Akhil Karthasseril Sivankutty, Alfredo Illanes, Michael Friebe
PURPOSE: Recent advances in endoscopy have led to new technologies with significant optical imaging improvements. Since its development a few years ago, narrow-band imaging (NBI) has already been proved useful in detecting malignant lesions and carcinoma in clinical settings of urology, gastroenterology and ENT. The potential of this technology for imaging applications of the arterial vessel wall has not been properly analysed yet, but with the observed benefits could prove valuable for this clinical use as well...
March 30, 2017: International Journal of Computer Assisted Radiology and Surgery
https://www.readbyqxmd.com/read/28361324/coffee-the-key-to-safer-image-guided-surgery-a-granular-jamming-cap-for-non-invasive-rigid-fixation-of-fiducial-markers-to-the-patient
#13
Patrick S Wellborn, Neal P Dillon, Paul T Russell, Robert J Webster
PURPOSE: Accurate image guidance requires a rigid connection between tracked fiducial markers and the patient, which cannot be guaranteed by current non-invasive attachment techniques. We propose a new granular jamming approach to firmly, yet non-invasively, connect fiducials to the patient. METHODS: Our granular jamming cap surrounds the head and conforms to the contours of the patient's skull. When a vacuum is drawn, the device solidifies in a manner conceptually like a vacuum-packed bag of ground coffee, providing a rigid structure that can firmly hold fiducial markers to the patient's skull...
March 30, 2017: International Journal of Computer Assisted Radiology and Surgery
https://www.readbyqxmd.com/read/28361323/slide-automatic-spine-level-identification-system-using-a-deep-convolutional-neural-network
#14
Jorden Hetherington, Victoria Lessoway, Vit Gunka, Purang Abolmaesumi, Robert Rohling
PURPOSE: Percutaneous spinal needle insertion procedures often require proper identification of the vertebral level to effectively and safely deliver analgesic agents. The current clinical method involves "blind" identification of the vertebral level through manual palpation of the spine, which has only 30% reported accuracy. Therefore, there is a need for better anatomical identification prior to needle insertion. METHODS: A real-time system was developed to identify the vertebral level from a sequence of ultrasound images, following a clinical imaging protocol...
March 30, 2017: International Journal of Computer Assisted Radiology and Surgery
https://www.readbyqxmd.com/read/28357628/addressing-multi-label-imbalance-problem-of-surgical-tool-detection-using-cnn
#15
Manish Sahu, Anirban Mukhopadhyay, Angelika Szengel, Stefan Zachow
PURPOSE: A fully automated surgical tool detection framework is proposed for endoscopic video streams. State-of-the-art surgical tool detection methods rely on supervised one-vs-all or multi-class classification techniques, completely ignoring the co-occurrence relationship of the tools and the associated class imbalance. METHODS: In this paper, we formulate tool detection as a multi-label classification task where tool co-occurrences are treated as separate classes...
March 29, 2017: International Journal of Computer Assisted Radiology and Surgery
https://www.readbyqxmd.com/read/28357627/anser-emt-the-first-open-source-electromagnetic-tracking-platform-for-image-guided-interventions
#16
Herman Alexander Jaeger, Alfred Michael Franz, Kilian O'Donoghue, Alexander Seitel, Fabian Trauzettel, Lena Maier-Hein, Pádraig Cantillon-Murphy
PURPOSE: Electromagnetic tracking is the gold standard for instrument tracking and navigation in the clinical setting without line of sight. Whilst clinical platforms exist for interventional bronchoscopy and neurosurgical navigation, the limited flexibility and high costs of electromagnetic tracking (EMT) systems for research investigations mitigate against a better understanding of the technology's characterisation and limitations. The Anser project provides an open-source implementation for EMT with particular application to image-guided interventions...
March 29, 2017: International Journal of Computer Assisted Radiology and Surgery
https://www.readbyqxmd.com/read/28349507/transfer-learning-from-rf-to-b-mode-temporal-enhanced-ultrasound-features-for-prostate-cancer-detection
#17
Shekoofeh Azizi, Parvin Mousavi, Pingkun Yan, Amir Tahmasebi, Jin Tae Kwak, Sheng Xu, Baris Turkbey, Peter Choyke, Peter Pinto, Bradford Wood, Purang Abolmaesumi
PURPOSE: We present a method for prostate cancer (PCa) detection using temporal enhanced ultrasound (TeUS) data obtained either from radiofrequency (RF) ultrasound signals or B-mode images. METHODS: For the first time, we demonstrate that by applying domain adaptation and transfer learning methods, a tissue classification model trained on TeUS RF data (source domain) can be deployed for classification using TeUS B-mode data alone (target domain), where both data are obtained on the same ultrasound scanner...
March 27, 2017: International Journal of Computer Assisted Radiology and Surgery
https://www.readbyqxmd.com/read/28349506/robust-and-automatic-diagnosis-of-the-intraventricular-mechanical-dyssynchrony-for-the-left-ventricle-in-cardiac-magnetic-resonance-images
#18
Zhenzhou Wang
PURPOSE: Robust and automatic diagnosis of the mechanical dyssynchrony for the left ventricle is essential for the cardiac resynchronization therapy. However, no existing method could meet the desired accuracy yet. In this paper, a new approach is proposed for auto-diagnosis of the intraventricular mechanical dyssynchrony of the left ventricle based on a series of image processing and signal processing techniques. METHODS: Firstly, the boundary of the left ventricle is identified automatically by the segmentation method...
March 27, 2017: International Journal of Computer Assisted Radiology and Surgery
https://www.readbyqxmd.com/read/28349505/fast-approximation-for-joint-optimization-of-segmentation-shape-and-location-priors-and-its-application-in-gallbladder-segmentation
#19
Atsushi Saito, Shigeru Nawano, Akinobu Shimizu
PURPOSE: This paper addresses joint optimization for segmentation and shape priors, including translation, to overcome inter-subject variability in the location of an organ. Because a simple extension of the previous exact optimization method is too computationally complex, we propose a fast approximation for optimization. The effectiveness of the proposed approximation is validated in the context of gallbladder segmentation from a non-contrast computed tomography (CT) volume. METHODS: After spatial standardization and estimation of the posterior probability of the target organ, simultaneous optimization of the segmentation, shape, and location priors is performed using a branch-and-bound method...
March 27, 2017: International Journal of Computer Assisted Radiology and Surgery
https://www.readbyqxmd.com/read/28343304/geometry-calibration-between-x-ray-source-and-detector-for-tomosynthesis-with-a-portable-x-ray-system
#20
Kohei Sato, Takashi Ohnishi, Masashi Sekine, Hideaki Haneishi
PURPOSE: Tomosynthesis is attracting attention as a low-dose tomography technology compared with X-ray CT. However, conventional tomosynthesis imaging devices are large and stationary. Furthermore, there is a limitation in the working range of the X-ray source during image acquisition. We have previously proposed the use of a portable X-ray device for tomosynthesis that can be used for ward rounds and emergency medicine. The weight of this device can be reduced by using a flat panel detector (FPD), and flexibility is realized by the free placement of the X-ray source and FPD...
March 25, 2017: International Journal of Computer Assisted Radiology and Surgery
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