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International Journal of Computer Assisted Radiology and Surgery

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https://www.readbyqxmd.com/read/29151194/highly-immersive-virtual-reality-laparoscopy-simulation-development-and-future-aspects
#1
Tobias Huber, Tom Wunderling, Markus Paschold, Hauke Lang, Werner Kneist, Christian Hansen
PURPOSE: Virtual reality (VR) applications with head-mounted displays (HMDs) have had an impact on information and multimedia technologies. The current work aimed to describe the process of developing a highly immersive VR simulation for laparoscopic surgery. METHODS: We combined a VR laparoscopy simulator (LapSim) and a VR-HMD to create a user-friendly VR simulation scenario. Continuous clinical feedback was an essential aspect of the development process. We created an artificial VR (AVR) scenario by integrating the simulator video output with VR game components of figures and equipment in an operating room...
November 18, 2017: International Journal of Computer Assisted Radiology and Surgery
https://www.readbyqxmd.com/read/29147954/a-fully-automatic-end-to-end-method-for-content-based-image-retrieval-of-ct-scans-with-similar-liver-lesion-annotations
#2
A B Spanier, N Caplan, J Sosna, B Acar, L Joskowicz
PURPOSE: The goal of medical content-based image retrieval (M-CBIR) is to assist radiologists in the decision-making process by retrieving medical cases similar to a given image. One of the key interests of radiologists is lesions and their annotations, since the patient treatment depends on the lesion diagnosis. Therefore, a key feature of M-CBIR systems is the retrieval of scans with the most similar lesion annotations. To be of value, M-CBIR systems should be fully automatic to handle large case databases...
November 16, 2017: International Journal of Computer Assisted Radiology and Surgery
https://www.readbyqxmd.com/read/29143240/dynamic-infrared-thermography-dirt-for-assessment-of-skin-blood-perfusion-in-cranioplasty-a-proof-of-concept-for-qualitative-comparison-with-the-standard-indocyanine-green-video-angiography-icga
#3
P Rathmann, C Chalopin, D Halama, P Giri, J Meixensberger, D Lindner
PURPOSE: Complications in wound healing after neurosurgical operations occur often due to scarred dehiscence with skin blood perfusion disturbance. The standard imaging method for intraoperative skin perfusion assessment is the invasive indocyanine green video angiography (ICGA). The noninvasive dynamic infrared thermography (DIRT) is a promising alternative modality that was evaluated by comparison with ICGA. METHODS: The study was carried out in two parts: (1) investigation of technical conditions for intraoperative use of DIRT for its comparison with ICGA, and (2) visual and quantitative comparison of both modalities in a proof of concept on nine patients...
November 15, 2017: International Journal of Computer Assisted Radiology and Surgery
https://www.readbyqxmd.com/read/29134472/real-time-wireless-tumor-tracking-during-breast-conserving-surgery
#4
Natasja Janssen, Roeland Eppenga, Marie-Jeanne Vrancken Peeters, Frederieke van Duijnhoven, Hester Oldenburg, Jos van der Hage, Emiel Rutgers, Jan-Jakob Sonke, Koert Kuhlmann, Theo Ruers, Jasper Nijkamp
PURPOSE: To evaluate a novel surgical navigation system for breast conserving surgery (BCS), based on real-time tumor tracking using the Calypso[Formula: see text] 4D Localization System (Varian Medical Systems Inc., USA). Navigation-guided breast conserving surgery (Nav-BCS) was compared to conventional iodine seed-guided BCS ([Formula: see text]I-BCS). METHODS: Two breast phantom types were produced, containing spherical and complex tumors in which wireless transponders (Nav-BCS) or a iodine seed ([Formula: see text]I-BCS) were implanted...
November 13, 2017: International Journal of Computer Assisted Radiology and Surgery
https://www.readbyqxmd.com/read/29128942/editorial-for-innovative-clinical-investigations-example-of-a-framework-for-determining-the-stages-of-innovation-in-surgery-or-other-interventional-procedures
#5
EDITORIAL
Heniz U Lemke
No abstract text is available yet for this article.
November 11, 2017: International Journal of Computer Assisted Radiology and Surgery
https://www.readbyqxmd.com/read/29110185/positioning-error-of-custom-3d-printed-surgical-guides-for-the-radius-influence-of-fitting-location-and-guide-design
#6
G Caiti, J G G Dobbe, G J Strijkers, S D Strackee, G J Streekstra
PURPOSE: Utilization of 3D-printed patient-specific surgical guides is a promising navigation approach for orthopedic surgery. However, navigation errors can arise if the guide is not correctly positioned at the planned bone location, compromising the surgical outcome. Quantitative measurements of guide positioning errors are rarely reported and have never been related to guide design and underlying bone anatomy. In this study, the positioning accuracy of a standard and an extended guide design with lateral extension is evaluated at different fitting locations (distal, mid-shaft and proximal) on the volar side of the radius...
November 6, 2017: International Journal of Computer Assisted Radiology and Surgery
https://www.readbyqxmd.com/read/29105019/texture-specific-bag-of-visual-words-model-and-spatial-cone-matching-based-method-for-the-retrieval-of-focal-liver-lesions-using-multiphase-contrast-enhanced-ct-images
#7
Yingying Xu, Lanfen Lin, Hongjie Hu, Dan Wang, Wenchao Zhu, Jian Wang, Xian-Hua Han, Yen-Wei Chen
PURPOSE: The bag of visual words (BoVW) model is a powerful tool for feature representation that can integrate various handcrafted features like intensity, texture, and spatial information. In this paper, we propose a novel BoVW-based method that incorporates texture and spatial information for the content-based image retrieval to assist radiologists in clinical diagnosis. METHODS: This paper presents a texture-specific BoVW method to represent focal liver lesions (FLLs)...
November 5, 2017: International Journal of Computer Assisted Radiology and Surgery
https://www.readbyqxmd.com/read/29101641/an-x-ray-free-method-to-accurately-identify-the-elbow-flexion-extension-axis-for-the-placement-of-a-hinged-external-fixator
#8
Jian Song, Hui Ding, Wei Han, Junqiang Wang, Guangzhi Wang
PURPOSE: Identifying the elbow flexion-extension (F-E) movement axis is important for placing a hinged elbow external fixator. An X-ray fluoroscopy-based method is widely used in clinical practice, exposing the patient and surgeons to high doses of radiation. Additionally, the accuracy and repeatability of the fluoroscopy-based method are very low and affected by subjective factors. METHODS: To solve this problem, an X-ray-free method based on kinematics analysis was proposed to identify the elbow F-E movement axis, and a navigation system was built to guide the placement of the elbow external fixator...
November 3, 2017: International Journal of Computer Assisted Radiology and Surgery
https://www.readbyqxmd.com/read/29101640/computational-modeling-of-abdominal-hernia-laparoscopic-repair-with-a-surgical-mesh
#9
Silvia Todros, Paola Pachera, Nicola Baldan, Piero G Pavan, Silvia Pianigiani, Stefano Merigliano, Arturo N Natali
PURPOSE: Although new techniques and prostheses have been introduced in ventral hernia surgery, abdominal hernia repair still presents complications, such as recurrence, pain, and discomfort. Thus, this work implements a computational method aimed at evaluating biomechanical aspects of the abdominal hernia laparoscopic repair, which can support clinical research tailored to hernia surgery. METHODS: A virtual solid model of the abdominal wall is obtained from MRI scans of a healthy subject...
November 3, 2017: International Journal of Computer Assisted Radiology and Surgery
https://www.readbyqxmd.com/read/29101639/an-automatic-markerless-registration-method-for-neurosurgical-robotics-based-on-an-optical-camera
#10
Fanle Meng, Fangwen Zhai, Bowei Zeng, Hui Ding, Guangzhi Wang
PURPOSE: Current markerless registration methods for neurosurgical robotics use the facial surface to match the robot space with the image space, and acquisition of the facial surface usually requires manual interaction and constrains the patient to a supine position. To overcome these drawbacks, we propose a registration method that is automatic and does not constrain patient position. METHODS: An optical camera attached to the robot end effector captures images around the patient's head from multiple views...
November 3, 2017: International Journal of Computer Assisted Radiology and Surgery
https://www.readbyqxmd.com/read/29086234/objective-assessment-of-colonoscope-manipulation-skills-in-colonoscopy-training
#11
Matthew S Holden, Chang Nancy Wang, Kyle MacNeil, Ben Church, Lawrence Hookey, Gabor Fichtinger, Tamas Ungi
OBJECTIVE: Manipulation of the colonoscope is a technical challenge for novice clinicians which is best learned in a simulated environment. It involves the coordination of scope tip steering with scope insertion, using a rotated image as reference. The purpose of this work is to develop and validate a system which objectively assesses colonoscopy technical skills proficiency in an arbitrary training environment, allowing novices to assess their technical proficiency prior to real patient encounters...
October 30, 2017: International Journal of Computer Assisted Radiology and Surgery
https://www.readbyqxmd.com/read/29080945/planning-of-skull-reconstruction-based-on-a-statistical-shape-model-combined-with-geometric-morphometrics
#12
Marc Anton Fuessinger, Steffen Schwarz, Carl-Peter Cornelius, Marc Christian Metzger, Edward Ellis, Florian Probst, Wiebke Semper-Hogg, Mathieu Gass, Stefan Schlager
PURPOSE: Virtual reconstruction of large cranial defects is still a challenging task. The current reconstruction procedures depend on the surgeon's experience and skills in planning the reconstruction based on mirroring and manual adaptation. The aim of this study is to propose and evaluate a computer-based approach employing a statistical shape model (SSM) of the cranial vault. METHODS: An SSM was created based on 131 CT scans of pathologically unaffected adult crania...
October 28, 2017: International Journal of Computer Assisted Radiology and Surgery
https://www.readbyqxmd.com/read/29079993/auditory-display-as-feedback-for-a-novel-eye-tracking-system-for-sterile-operating-room-interaction
#13
David Black, Michael Unger, Nele Fischer, Ron Kikinis, Horst Hahn, Thomas Neumuth, Bernhard Glaser
PURPOSE: The growing number of technical systems in the operating room has increased attention on developing touchless interaction methods for sterile conditions. However, touchless interaction paradigms lack the tactile feedback found in common input devices such as mice and keyboards. We propose a novel touchless eye-tracking interaction system with auditory display as a feedback method for completing typical operating room tasks. Auditory display provides feedback concerning the selected input into the eye-tracking system as well as a confirmation of the system response...
October 27, 2017: International Journal of Computer Assisted Radiology and Surgery
https://www.readbyqxmd.com/read/29079992/vcsim3-a-vr-simulator-for-cardiovascular-interventions
#14
Przemyslaw Korzeniowski, Ruth J White, Fernando Bello
PURPOSE: Effective and safe performance of cardiovascular interventions requires excellent catheter/guidewire manipulation skills. These skills are currently mainly gained through an apprenticeship on real patients, which may not be safe or cost-effective. Computer simulation offers an alternative for core skills training. However, replicating the physical behaviour of real instruments navigated through blood vessels is a challenging task. METHODS: We have developed VCSim3-a virtual reality simulator for cardiovascular interventions...
October 27, 2017: International Journal of Computer Assisted Radiology and Surgery
https://www.readbyqxmd.com/read/29063277/3d-2d-registration-in-endovascular-image-guided-surgery-evaluation-of-state-of-the-art-methods-on-cerebral-angiograms
#15
Uroš Mitrović, Boštjan Likar, Franjo Pernuš, Žiga Špiclin
PURPOSE: Image guidance for minimally invasive surgery is based on spatial co-registration and fusion of 3D pre-interventional images and treatment plans with the 2D live intra-interventional images. The spatial co-registration or 3D-2D registration is the key enabling technology; however, the performance of state-of-the-art automated methods is rather unclear as they have not been assessed under the same test conditions. Herein we perform a quantitative and comparative evaluation of ten state-of-the-art methods for 3D-2D registration on a public dataset of clinical angiograms...
October 24, 2017: International Journal of Computer Assisted Radiology and Surgery
https://www.readbyqxmd.com/read/29032421/computer-based-radiological-longitudinal-evaluation-of-meningiomas-following-stereotactic-radiosurgery
#16
Eli Ben Shimol, Leo Joskowicz, Ruth Eliahou, Yigal Shoshan
PURPOSE: Stereotactic radiosurgery (SRS) is a common treatment for intracranial meningiomas. SRS is planned on a pre-therapy gadolinium-enhanced T1-weighted MRI scan (Gd-T1w MRI) in which the meningioma contours have been delineated. Post-SRS therapy serial Gd-T1w MRI scans are then acquired for longitudinal treatment evaluation. Accurate tumor volume change quantification is required for treatment efficacy evaluation and for treatment continuation. METHOD: We present a new algorithm for the automatic segmentation and volumetric assessment of meningioma in post-therapy Gd-T1w MRI scans...
October 14, 2017: International Journal of Computer Assisted Radiology and Surgery
https://www.readbyqxmd.com/read/28983750/preliminary-study-on-magnetic-tracking-based-planar-shape-sensing-and-navigation-for-flexible-surgical-robots-in-transoral-surgery-methods-and-phantom-experiments
#17
Shuang Song, Changchun Zhang, Li Liu, Max Q-H Meng
PURPOSE: Flexible surgical robot can work in confined and complex environments, which makes it a good option for minimally invasive surgery. In order to utilize flexible manipulators in complicated and constrained surgical environments, it is of great significance to monitor the position and shape of the curvilinear manipulator in real time during the procedures. In this paper, we propose a magnetic tracking-based planar shape sensing and navigation system for flexible surgical robots in the transoral surgery...
October 5, 2017: International Journal of Computer Assisted Radiology and Surgery
https://www.readbyqxmd.com/read/28965293/pca-based-localization-approach-for-segmentation-of-optic-disc
#18
Varun P Gopi, M S Anjali, S Issac Niwas
PURPOSE: The optic disc is the origin of the optic nerve, where the axons of retinal ganglion cells join together. The size, shape and contour of optic disc are used for classification and identification of retinal diseases. Automatic detection of eye disease requires development of an efficient algorithm. This paper proposes an efficient method for optic disc segmentation and detection for the diagnosis of retinal diseases. METHODS: The methodology involves optic disc localization, blood vessel inpainting and optic disc segmentation...
September 30, 2017: International Journal of Computer Assisted Radiology and Surgery
https://www.readbyqxmd.com/read/28929364/anthropomorphic-liver-phantom-with-flow-for-multimodal-image-guided-liver-therapy-research-and-training
#19
Anna Rethy, Jørn Ove Sæternes, Jostein Halgunset, Ronald Mårvik, Erlend F Hofstad, Juan A Sánchez-Margallo, Thomas Langø
PURPOSE: The objective of this study was to develop a multimodal, permanent liver phantom displaying functional vasculature and common pathologies, for teaching, training and equipment development in laparoscopic ultrasound and navigation. METHODS: Molten wax was injected simultaneously into the portal and hepatic veins of a human liver. Upon solidification of the wax, the surrounding liver tissue was dissolved, leaving a cast of the vessels. A connection was established between the two vascular trees by manually manipulating the wax...
September 19, 2017: International Journal of Computer Assisted Radiology and Surgery
https://www.readbyqxmd.com/read/28929305/auditory-display-for-fluorescence-guided-open-brain-tumor-surgery
#20
David Black, Horst K Hahn, Ron Kikinis, Karin Wårdell, Neda Haj-Hosseini
PURPOSE: Protoporphyrin (PpIX) fluorescence allows discrimination of tumor and normal brain tissue during neurosurgery. A handheld fluorescence (HHF) probe can be used for spectroscopic measurement of 5-ALA-induced PpIX to enable objective detection compared to visual evaluation of fluorescence. However, current technology requires that the surgeon either views the measured values on a screen or employs an assistant to verbally relay the values. An auditory feedback system was developed and evaluated for communicating measured fluorescence intensity values directly to the surgeon...
September 19, 2017: International Journal of Computer Assisted Radiology and Surgery
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