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International Journal of Computer Assisted Radiology and Surgery

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https://www.readbyqxmd.com/read/28204986/validation-workflow-for-a-clinical-bayesian-network-model-in-multidisciplinary-decision-making-in-head-and-neck-oncology-treatment
#1
Mario A Cypko, Matthaeus Stoehr, Marcin Kozniewski, Marek J Druzdzel, Andreas Dietz, Leonard Berliner, Heinz U Lemke
PURPOSE: Oncological treatment is being increasingly complex, and therefore, decision making in multidisciplinary teams is becoming the key activity in the clinical pathways. The increased complexity is related to the number and variability of possible treatment decisions that may be relevant to a patient. In this paper, we describe validation of a multidisciplinary cancer treatment decision in the clinical domain of head and neck oncology. METHOD: Probabilistic graphical models and corresponding inference algorithms, in the form of Bayesian networks, can support complex decision-making processes by providing a mathematically reproducible and transparent advice...
February 15, 2017: International Journal of Computer Assisted Radiology and Surgery
https://www.readbyqxmd.com/read/28197760/automated-identification-and-reduction-of-artifacts-in-cine-four-dimensional-computed-tomography-4dct-images-using-respiratory-motion-model
#2
Min Li, Sarah Joy Castillo, Richard Castillo, Edward Castillo, Thomas Guerrero, Liang Xiao, Xiaolin Zheng
PURPOSE: Four-dimensional computed tomography (4DCT) images are often marred by artifacts that substantially degrade image quality and confound image interpretation. Human observation remains the standard method of 4DCT artifact evaluation, which is time-consuming and subjective. We develop a method to automatically identify and reduce artifacts in cine 4DCT images. METHODS: We proposed an algorithm that consisted of two main stages: deformable image registration and respiratory motion simulation...
February 14, 2017: International Journal of Computer Assisted Radiology and Surgery
https://www.readbyqxmd.com/read/28197759/minimally-invasive-multi-port-approach-to-the-lateral-skull-base-a-first-in-vitro-evaluation
#3
Igor Stenin, Stefan Hansen, M Nau-Hermes, W El-Hakimi, M Becker, J Bredemann, J Kristin, T Klenzner, J Schipper
PURPOSE: The aim of the study was to validate a minimally invasive, multi-port approach to the internal auditory canal at the lateral skull base on a cadaver specimen. METHODS: Fiducials and a custom baseplate were fixed on a cadaver skull, and a computed tomography image was acquired. Three trajectories from the mastoid surface to the internal auditory canal were computed with a custom planning tool. A self-developed positioning system with a drill guide was attached to the baseplate...
February 14, 2017: International Journal of Computer Assisted Radiology and Surgery
https://www.readbyqxmd.com/read/28190127/application-of-computer-aided-design-and-3d-printed-navigation-template-in-locking-compression-pediatric-hip-plate-formula-see-text-placement-for-pediatric-hip-disease
#4
Pengfei Zheng, Qingqiang Yao, Peng Xu, Liming Wang
BACKGROUND: To investigate the feasibility and accuracy of a drill template based on computer-aided design (CAD) and 3D printing technology for the placement of screws in Locking Compression Pediatric Hip Plate (LCP-PHP). METHODS: LCP-PHP was used in 11 children [5 with femoral neck fracture and 6 with development dysplasia of hip (DDH)]. Using the CT data, the proximal femur model was created by a 3D printer. Fracture reduction and the placement of the screw in the femoral neck and the LCP-PHP were simulated by the computer...
February 11, 2017: International Journal of Computer Assisted Radiology and Surgery
https://www.readbyqxmd.com/read/28188486/validation-of-a-method-for-retroperitoneal-tumor-segmentation
#5
Cristina Suárez-Mejías, José A Pérez-Carrasco, Carmen Serrano, José L López-Guerra, Tomás Gómez-Cía, Carlos L Parra-Calderón, Begoña Acha
PURPOSE: In 2005, an application for surgical planning called AYRA[Formula: see text] was designed and validated by different surgeons and engineers at the Virgen del Rocío University Hospital, Seville (Spain). However, the segmentation methods included in AYRA and in other surgical planning applications are not able to segment accurately tumors that appear in soft tissue. The aims of this paper are to offer an exhaustive validation of an accurate semiautomatic segmentation tool to delimitate retroperitoneal tumors from CT images and to aid physicians in planning both radiotherapy doses and surgery...
February 10, 2017: International Journal of Computer Assisted Radiology and Surgery
https://www.readbyqxmd.com/read/28188485/feasibility-of-laser-guided-percutaneous-pedicle-screw-placement-in-the-lumbar-spine-using-a-hybrid-or
#6
P H Richter, F Gebhard, M Salameh, K Schuetze, M Kraus
PURPOSE: Innovations in intraoperative imaging lead to major changes in orthopaedic surgery. In our setting, a 3D flat-panel c-arm (Artis zeego) is mounted on a robotic arm offering an integrated aiming tool (Syngo iGuide). Our aim was to investigate the feasibility of Syngo iGuide for pedicle screw placement in comparison with fluoroscopic screw implantation. METHODS: In 10 lumbar models, 100 screws were implanted. In 5 models, a standard fluoroscopic technique was used...
February 10, 2017: International Journal of Computer Assisted Radiology and Surgery
https://www.readbyqxmd.com/read/28188484/estimation-of-attachment-regions-of-hip-muscles-in-ct-image-using-muscle-attachment-probabilistic-atlas-constructed-from-measurements-in-eight-cadavers
#7
Norio Fukuda, Yoshito Otake, Masaki Takao, Futoshi Yokota, Takeshi Ogawa, Keisuke Uemura, Ryota Nakaya, Kazunori Tamura, Robert B Grupp, Amirhossein Farvardin, Mehran Armand, Nobuhiko Sugano, Yoshinobu Sato
PURPOSE: Patient-specific musculoskeletal biomechanical simulation is useful in preoperative surgical planning and postoperative assessment in orthopedic surgery and rehabilitation medicine. A difficulty in application of the patient-specific musculoskeletal modeling comes from the fact that the muscle attachment regions are typically invisible in CT and MRI. Our purpose is to develop a method for estimating patient-specific muscle attachment regions from 3D medical images and to validate with cadaver experiments...
February 10, 2017: International Journal of Computer Assisted Radiology and Surgery
https://www.readbyqxmd.com/read/28188483/integrating-cad-modules-in-a-pacs-environment-using-a-wide-computing-infrastructure
#8
Jorge J Suárez-Cuenca, Amara Tilve, Ricardo López, Gonzalo Ferro, Javier Quiles, Miguel Souto
PURPOSE: The aim of this paper is to describe a project designed to achieve a total integration of different CAD algorithms into the PACS environment by using a wide computing infrastructure. METHODS: The aim is to build a system for the entire region of Galicia, Spain, to make CAD accessible to multiple hospitals by employing different PACSs and clinical workstations. The new CAD model seeks to connect different devices (CAD systems, acquisition modalities, workstations and PACS) by means of networking based on a platform that will offer different CAD services...
February 10, 2017: International Journal of Computer Assisted Radiology and Surgery
https://www.readbyqxmd.com/read/28168682/a-magnetic-resonance-image-guided-breast-needle-intervention-robot-system-overview-and-design-considerations
#9
Samuel Byeongjun Park, Jung-Gun Kim, Ki-Woong Lim, Chae-Hyun Yoon, Dong-Jun Kim, Han-Sung Kang, Yung-Ho Jo
PURPOSE: We developed an image-guided intervention robot system that can be operated in a magnetic resonance (MR) imaging gantry. The system incorporates a bendable needle intervention robot for breast cancer patients that overcomes the space limitations of the MR gantry. METHODS: Most breast coil designs for breast MR imaging have side openings to allow manual localization. However, for many intervention procedures, the patient must be removed from the gantry. A robotic manipulation system with integrated image guidance software was developed...
February 6, 2017: International Journal of Computer Assisted Radiology and Surgery
https://www.readbyqxmd.com/read/28168681/normal-model-construction-for-statistical-image-analysis-of-torso-fdg-pet-images-based-on-anatomical-standardization-by-ct-images-from-fdg-pet-ct-devices
#10
Kenshiro Takeda, Takeshi Hara, Xiangrong Zhou, Tetsuro Katafuchi, Masaya Kato, Satoshi Ito, Keiichi Ishihara, Shinichiro Kumita, Hiroshi Fujita
PURPOSE: A better understanding of the standardized uptake value (SUV) ranges of fludeoxyglucose positron emission tomography (FDG-PET) is crucial for radiologists. We have developed a statistical image analysis method for FDG-PET imaging of the torso, based on comparisons with normal data. The purpose of this study was to verify the accuracy of the normal model and usefulness of the statistical image analysis method by using typical cancer cases in the liver, lungs, and abdomen. METHODS: Our study and the data collection (49 normal and 34 abnormal cases, in terms of PET/CT findings) were approved by the institutional review board...
February 6, 2017: International Journal of Computer Assisted Radiology and Surgery
https://www.readbyqxmd.com/read/28168680/erratum-to-central-x-ray-beam-correction-of-radiographic-acetabular-cup-measurement-after-tha-an-experimental-study
#11
T Schwarz, M Weber, M Wörner, T Renkawitz, J Grifka, B Craiovan
No abstract text is available yet for this article.
February 6, 2017: International Journal of Computer Assisted Radiology and Surgery
https://www.readbyqxmd.com/read/28144830/cost-effective-personalized-3d-printed-liver-model-for-preoperative-planning-before-laparoscopic-liver-hemihepatectomy-for-colorectal-cancer-metastases
#12
Jan Sylwester Witowski, Michał Pędziwiatr, Piotr Major, Andrzej Budzyński
PURPOSE: Three-dimensional (3D) printing for preoperative planning has been intensively developed in the recent years. However, the implementation of these solutions in hospitals is still difficult due to high costs, extremely expensive industrial-grade printers, and software that is difficult to obtain and learn along with a lack of a defined process. This paper presents a cost-effective technique of preparing 3D-printed liver models that preserves the shape and all of the structures, including the vessels and the tumor, which in the present case is colorectal liver metastasis...
January 31, 2017: International Journal of Computer Assisted Radiology and Surgery
https://www.readbyqxmd.com/read/28130702/evaluation-of-tongue-squamous-cell-carcinoma-resection-margins-using-ex-vivo-mr
#13
Stefan C A Steens, Elise M Bekers, Willem L J Weijs, Geert J S Litjens, Andor Veltien, Arie Maat, Guido B van den Broek, Jeroen A W M van der Laak, Jürgen J Fütterer, Christina A Hulsbergen van der Kaa, Matthias A W Merkx, Robert P Takes
PURPOSE: Purpose of this feasibility study was (1) to evaluate whether application of ex-vivo 7T MR of the resected tongue specimen containing squamous cell carcinoma may provide information on the resection margin status and (2) to evaluate the research and developmental issues that have to be solved for this technique to have the beneficial impact on clinical outcome that we expect: better oncologic and functional outcomes, better quality of life, and lower costs. METHODS: We performed a non-blinded validation of ex-vivo 7T MR to detect the tongue squamous cell carcinoma and resection margin in 10 fresh tongue specimens using histopathology as gold standard...
January 27, 2017: International Journal of Computer Assisted Radiology and Surgery
https://www.readbyqxmd.com/read/28120179/comparison-of-gesture-and-conventional-interaction-techniques-for-interventional-neuroradiology
#14
Julian Hettig, Patrick Saalfeld, Maria Luz, Mathias Becker, Martin Skalej, Christian Hansen
PURPOSE: Interaction with radiological image data and volume renderings within a sterile environment is a challenging task. Clinically established methods such as joystick control and task delegation can be time-consuming and error-prone and interrupt the workflow. New touchless input modalities may have the potential to overcome these limitations, but their value compared to established methods is unclear. METHODS: We present a comparative evaluation to analyze the value of two gesture input modalities (Myo Gesture Control Armband and Leap Motion Controller) versus two clinically established methods (task delegation and joystick control)...
January 24, 2017: International Journal of Computer Assisted Radiology and Surgery
https://www.readbyqxmd.com/read/28110476/three-dimensional-texture-features-from-intensity-and-high-order-derivative-maps-for-the-discrimination-between-bladder-tumors-and-wall-tissues-via-mri
#15
Xiaopan Xu, Xi Zhang, Qiang Tian, Guopeng Zhang, Yang Liu, Guangbin Cui, Jiang Meng, Yuxia Wu, Tianshuai Liu, Zengyue Yang, Hongbing Lu
PURPOSE: This study aims to determine the three-dimensional (3D) texture features extracted from intensity and high-order derivative maps that could reflect textural differences between bladder tumors and wall tissues, and propose a noninvasive, image-based strategy for bladder tumor differentiation preoperatively. METHODS: A total of 62 cancerous and 62 wall volumes of interest (VOI) were extracted from T2-weighted MRI datasets of 62 patients with pathologically confirmed bladder cancer...
January 21, 2017: International Journal of Computer Assisted Radiology and Surgery
https://www.readbyqxmd.com/read/28101760/a-cad-of-fully-automated-colonic-polyp-detection-for-contrasted-and-non-contrasted-ct-scans
#16
Gökalp Tulum, Bülent Bolat, Onur Osman
PURPOSE: Computer-aided detection (CAD) systems are developed to help radiologists detect colonic polyps over CT scans. It is possible to reduce the detection time and increase the detection accuracy rates by using CAD systems. In this paper, we aimed to develop a fully integrated CAD system for automated detection of polyps that yields a high polyp detection rate with a reasonable number of false positives. METHODS: The proposed CAD system is a multistage implementation whose main components are: automatic colon segmentation, candidate detection, feature extraction and classification...
January 18, 2017: International Journal of Computer Assisted Radiology and Surgery
https://www.readbyqxmd.com/read/28097603/comprehensive-preclinical-evaluation-of-a-multi-physics-model-of-liver-tumor-radiofrequency-ablation
#17
Chloé Audigier, Tommaso Mansi, Hervé Delingette, Saikiran Rapaka, Tiziano Passerini, Viorel Mihalef, Marie-Pierre Jolly, Raoul Pop, Michele Diana, Luc Soler, Ali Kamen, Dorin Comaniciu, Nicholas Ayache
PURPOSE: We aim at developing a framework for the validation of a subject-specific multi-physics model of liver tumor radiofrequency ablation (RFA). METHODS: The RFA computation becomes subject specific after several levels of personalization: geometrical and biophysical (hemodynamics, heat transfer and an extended cellular necrosis model). We present a comprehensive experimental setup combining multimodal, pre- and postoperative anatomical and functional images, as well as the interventional monitoring of intra-operative signals: the temperature and delivered power...
January 17, 2017: International Journal of Computer Assisted Radiology and Surgery
https://www.readbyqxmd.com/read/28083804/improved-surgical-procedure-using-intraoperative-navigation-for-the-implantation-of-the-spg-microstimulator-in-patients-with-chronic-cluster-headache
#18
Carsten Kohlmeier, Peter Behrens, Andreas Böger, Brinda Ramachandran, Anthony Caparso, Dirk Schulze, Philipp Stude, Max Heiland, Alexandre T Assaf
INTRODUCTION: The ATI SPG microstimulator is designed to be fixed on the posterior maxilla, with the integrated lead extending into the pterygopalatine fossa to electrically stimulate the sphenopalatine ganglion (SPG) as a treatment for cluster headache. Preoperative surgical planning to ensure the placement of the microstimulator in close proximity (within 5 mm) to the SPG is critical for treatment efficacy. The aim of this study was to improve the surgical procedure by navigating the initial dissection prior to implantation using a passive optical navigation system and to match the post-operative CBCT images with the preoperative treatment plan to verify the accuracy of the intraoperative placement of the microstimulator...
January 12, 2017: International Journal of Computer Assisted Radiology and Surgery
https://www.readbyqxmd.com/read/28070777/breast-ultrasound-image-segmentation-a-survey
#19
REVIEW
Qinghua Huang, Yaozhong Luo, Qiangzhi Zhang
PURPOSE: Breast cancer is the most common form of cancer among women worldwide. Ultrasound imaging is one of the most frequently used diagnostic tools to detect and classify abnormalities of the breast. Recently, computer-aided diagnosis (CAD) systems using ultrasound images have been developed to help radiologists to increase diagnosis accuracy. However, accurate ultrasound image segmentation remains a challenging problem due to various ultrasound artifacts. In this paper, we investigate approaches developed for breast ultrasound (BUS) image segmentation...
January 9, 2017: International Journal of Computer Assisted Radiology and Surgery
https://www.readbyqxmd.com/read/28070776/computer-assisted-delineation-of-cerebral-infarct-from-diffusion-weighted-mri-using-gaussian-mixture-model
#20
Manas Kumar Nag, Subhranil Koley, Debarghya China, Anup Kumar Sadhu, Ravikanth Balaji, Siddharth Ghosh, Chandan Chakraborty
PURPOSE: Diffusion-weighted imaging (DWI) is a widely used medical imaging modality for diagnosis and monitoring of cerebral stroke. The identification of exact location of stroke lesion helps in perceiving its characteristics, an essential part of diagnosis and treatment planning. This task is challenging due to the typical shape of the stroke lesion. This paper proposes an efficient method for computer-aided delineation of stroke lesions from DWI images. METHOD: Proposed methodology comprises of three steps...
January 9, 2017: International Journal of Computer Assisted Radiology and Surgery
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