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International Journal of Computer Assisted Radiology and Surgery

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https://www.readbyqxmd.com/read/29330658/patient-specific-model-based-segmentation-of-brain-tumors-in-3d-intraoperative-ultrasound-images
#1
Elisee Ilunga-Mbuyamba, Juan Gabriel Avina-Cervantes, Dirk Lindner, Felix Arlt, Jean Fulbert Ituna-Yudonago, Claire Chalopin
PURPOSE: Intraoperative ultrasound (iUS) imaging is commonly used to support brain tumor operation. The tumor segmentation in the iUS images is a difficult task and still under improvement because of the low signal-to-noise ratio. The success of automatic methods is also limited due to the high noise sensibility. Therefore, an alternative brain tumor segmentation method in 3D-iUS data using a tumor model obtained from magnetic resonance (MR) data for local MR-iUS registration is presented in this paper...
January 12, 2018: International Journal of Computer Assisted Radiology and Surgery
https://www.readbyqxmd.com/read/29305790/patient-specific-estimation-of-detailed-cochlear-shape-from-clinical-ct-images
#2
H Martin Kjer, Jens Fagertun, Wilhelm Wimmer, Nicolas Gerber, Sergio Vera, Livia Barazzetti, Nerea Mangado, Mario Ceresa, Gemma Piella, Thomas Stark, Martin Stauber, Mauricio Reyes, Stefan Weber, Marco Caversaccio, Miguel Ángel González Ballester, Rasmus R Paulsen
PURPOSE: A personalized estimation of the cochlear shape can be used to create computational anatomical models to aid cochlear implant (CI) surgery and CI audio processor programming ultimately resulting in improved hearing restoration. The purpose of this work is to develop and test a method for estimation of the detailed patient-specific cochlear shape from CT images. METHODS: From a collection of temporal bone [Formula: see text]CT images, we build a cochlear statistical deformation model (SDM), which is a description of how a human cochlea deforms to represent the observed anatomical variability...
January 6, 2018: International Journal of Computer Assisted Radiology and Surgery
https://www.readbyqxmd.com/read/29299739/nonlinear-deformation-of-tractography-in-ultrasound-guided-low-grade-gliomas-resection
#3
Yiming Xiao, Live Eikenes, Ingerid Reinertsen, Hassan Rivaz
PURPOSE: In brain tumor surgeries, maximum removal of cancerous tissue without compromising normal brain functions can improve the patient's survival rate and therapeutic benefits. To achieve this, diffusion MRI and intra-operative ultrasound (iUS) can be highly instrumental. While diffusion MRI allows the visualization of white matter tracts and helps define the resection plan to best preserve the eloquent areas, iUS can effectively track the brain shift after craniotomy that often renders the pre-surgical plan invalid, ensuring the accuracy and safety of the intervention...
January 3, 2018: International Journal of Computer Assisted Radiology and Surgery
https://www.readbyqxmd.com/read/29294213/signal-attenuation-maps-for-needle-enhancement-and-localization-in-2d-ultrasound
#4
Cosmas Mwikirize, John L Nosher, Ilker Hacihaliloglu
PURPOSE: We propose a novel framework for enhancement and localization of steeply inserted hand-held needles under in-plane 2D ultrasound guidance. METHODS: Depth-dependent attenuation and non-axial specular reflection hinder visibility of steeply inserted needles. Here, we model signal transmission maps representative of the attenuation probability within the image domain. The maps are employed in a contextual regularization framework to recover needle shaft and tip information...
January 2, 2018: International Journal of Computer Assisted Radiology and Surgery
https://www.readbyqxmd.com/read/29290025/a-hybrid-optimization-strategy-for-registering-images-with-large-local-deformations-and-intensity-variations
#5
Zhang Li, Lucas J van Vliet, Jaap Stoker, Frans M Vos
PURPOSE: To develop a method for intra-patient registration of pre- and post-contrast abdominal MR images with large local deformations and large intensity variations. METHOD: A hybrid method is proposed to deal with this problem. It consists of two coupled techniques: (1) descriptor matching (DM) at the original resolution using a discrete optimization strategy to avoid getting trapped in a local minimum; (2) continuous optimization to refine the registration outcome based on autocorrelation of local image structure (ALOST)...
December 30, 2017: International Journal of Computer Assisted Radiology and Surgery
https://www.readbyqxmd.com/read/29270916/mri-radiomics-analysis-of-molecular-alterations-in-low-grade-gliomas
#6
Ben Shofty, Moran Artzi, Dafna Ben Bashat, Gilad Liberman, Oz Haim, Alon Kashanian, Felix Bokstein, Deborah T Blumenthal, Zvi Ram, Tal Shahar
PURPOSE: Low-grade gliomas (LGG) are classified into three distinct groups based on their IDH1 mutation and 1p/19q codeletion status, each of which is associated with a different clinical expression. The genomic sub-classification of LGG requires tumor sampling via neurosurgical procedures. The aim of this study was to evaluate the radiomics approach for noninvasive classification of patients with LGG and IDH mutation, based on their 1p/19q codeletion status, by testing different classifiers and assessing the contribution of the different MR contrasts...
December 21, 2017: International Journal of Computer Assisted Radiology and Surgery
https://www.readbyqxmd.com/read/29264829/obituary-for-kiyonari-inamura
#7
(no author information available yet)
No abstract text is available yet for this article.
December 20, 2017: International Journal of Computer Assisted Radiology and Surgery
https://www.readbyqxmd.com/read/29250750/improved-medical-image-fusion-based-on-cascaded-pca-and-shift-invariant-wavelet-transforms
#8
J Reena Benjamin, T Jayasree
PURPOSE: In the medical field, radiologists need more informative and high-quality medical images to diagnose diseases. Image fusion plays a vital role in the field of biomedical image analysis. It aims to integrate the complementary information from multimodal images, producing a new composite image which is expected to be more informative for visual perception than any of the individual input images. The main objective of this paper is to improve the information, to preserve the edges and to enhance the quality of the fused image using cascaded principal component analysis (PCA) and shift invariant wavelet transforms...
December 18, 2017: International Journal of Computer Assisted Radiology and Surgery
https://www.readbyqxmd.com/read/29236207/factors-related-to-disagreement-in-implant-size-between-preoperative-ct-based-planning-and-the-actual-implants-used-intraoperatively-for-total-hip-arthroplasty
#9
Takeshi Ogawa, Masaki Takao, Takashi Sakai, Nobuhiko Sugano
PURPOSE: In total hip arthroplasty, prediction of the optimal implant size is important in order to prevent perioperative complications. However, it is not easy to achieve complete agreement between the planned size and the actual size required appropriate implant fit. No previous report has adequately discussed the factors related to mismatch between predicted and actual implant sizes. The purpose was to report the results of a single surgeon case series of patients undergoing THA using computed tomography (CT)-based templating and the possible factors related to implant size mismatch...
December 13, 2017: International Journal of Computer Assisted Radiology and Surgery
https://www.readbyqxmd.com/read/29222631/an-advanced-simulator-for-orthopedic-surgical-training
#10
J Cecil, Avinash Gupta, Miguel Pirela-Cruz
PURPOSE: The purpose of creating the virtual reality (VR) simulator is to facilitate and supplement the training opportunities provided to orthopedic residents. The use of VR simulators has increased rapidly in the field of medical surgery for training purposes. This paper discusses the creation of the virtual surgical environment (VSE) for training residents in an orthopedic surgical process called less invasive stabilization system (LISS) surgery which is used to address fractures of the femur...
December 8, 2017: International Journal of Computer Assisted Radiology and Surgery
https://www.readbyqxmd.com/read/29188423/augmented-marker-tracking-for-peri-acetabular-osteotomy-surgery
#11
Silvio Pflugi, Rakesh Vasireddy, Till Lerch, Timo M Ecker, Moritz Tannast, Nane Boemke, Klaus Siebenrock, Guoyan Zheng
OBJECTIVE: To develop a hybrid augmented marker-based navigation system for acetabular reorientation during peri-acetabular osteotomy (PAO). METHODS: The system consists of a tracking unit attached to the patient's pelvis, augmented marker attached to the acetabular fragment and a host computer to do all the computations and visualization. The augmented marker is comprised of an external planar Aruco marker facing toward the tracking unit and an internal inertial measurement unit (IMU) to measure its orientation...
November 29, 2017: International Journal of Computer Assisted Radiology and Surgery
https://www.readbyqxmd.com/read/29170866/registration-of-angiographic-image-on-real-time-fluoroscopic-image-for-image-guided-percutaneous-coronary-intervention
#12
Dongkue Kim, Sangsoo Park, Myung Ho Jeong, Jeha Ryu
PURPOSE: In percutaneous coronary intervention (PCI), cardiologists must study two different X-ray image sources: a fluoroscopic image and an angiogram. Manipulating a guidewire while alternately monitoring the two separate images on separate screens requires a deep understanding of the anatomy of coronary vessels and substantial training. We propose 2D/2D spatiotemporal image registration of the two images in a single image in order to provide cardiologists with enhanced visual guidance in PCI...
November 23, 2017: International Journal of Computer Assisted Radiology and Surgery
https://www.readbyqxmd.com/read/29151194/highly-immersive-virtual-reality-laparoscopy-simulation-development-and-future-aspects
#13
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
#14
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
#15
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
#16
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
#17
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
#18
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
#19
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
#20
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
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