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International Journal of Computer Assisted Radiology and Surgery

Hongkai Wang, Nan Zhang, Li Huo, Bin Zhang
PURPOSE: Automated segmentation of torso organs from positron emission tomography/computed tomography (PET/CT) images is a prerequisite step for nuclear medicine image analysis. However, accurate organ segmentation from clinical PET/CT is challenging due to the poor soft tissue contrast in the low-dose CT image and the low spatial resolution of the PET image. To overcome these challenges, we developed a multi-atlas segmentation (MAS) framework for torso organ segmentation from 2-deoxy-2-[18 F]fluoro-D-glucose PET/CT images...
November 2, 2018: International Journal of Computer Assisted Radiology and Surgery
Grant Haskins, Jochen Kruecker, Uwe Kruger, Sheng Xu, Peter A Pinto, Brad J Wood, Pingkun Yan
PURPOSE: The fusion of transrectal ultrasound (TRUS) and magnetic resonance (MR) images for guiding targeted prostate biopsy has significantly improved the biopsy yield of aggressive cancers. A key component of MR-TRUS fusion is image registration. However, it is very challenging to obtain a robust automatic MR-TRUS registration due to the large appearance difference between the two imaging modalities. The work presented in this paper aims to tackle this problem by addressing two challenges: (i) the definition of a suitable similarity metric and (ii) the determination of a suitable optimization strategy...
October 31, 2018: International Journal of Computer Assisted Radiology and Surgery
Manas Kumar Nag, Saunak Chatterjee, Anup Kumar Sadhu, Jyotirmoy Chatterjee, Nirmalya Ghosh
PURPOSE: To reduce the inter- and intra- rater variability as well as time and effort, a method for computer-assisted delineation of hematoma is proposed. Delineation of hematoma is done for further automated analysis such as the volume of hematoma, anatomical location of hematoma, etc. for proper surgical planning. METHODS: Fuzzy-based intensifier was used as a pre-processing technique for enhancing the computed tomography (CT) volume. Autoencoder was trained to detect the CT slices with hematoma for initialization...
October 30, 2018: International Journal of Computer Assisted Radiology and Surgery
Mai Bui, Felix Bourier, Christoph Baur, Fausto Milletari, Nassir Navab, Stefanie Demirci
PURPOSE: Clinical cardiac electrophysiology (EP) is concerned with diagnosis and treatment of cardiac arrhythmia describing abnormality or perturbation in the normal activation sequence of the myocardium. With the recent introduction of lowest dose X-ray imaging protocol for EP procedures, interventional image enhancement has gained crucial importance for the well-being of patients as well as medical staff. METHODS: In this paper, we introduce a novel method to detect and track different EP catheter electrodes in lowest dose fluoroscopic sequences based on [Formula: see text]-sparse coding and online robust PCA (ORPCA)...
October 28, 2018: International Journal of Computer Assisted Radiology and Surgery
Shaked Perek, Nahum Kiryati, Gali Zimmerman-Moreno, Miri Sklair-Levy, Eli Konen, Arnaldo Mayer
PURPOSE: Contrast-enhanced spectral mammography (CESM) is a recently developed breast imaging technique. CESM relies on dual-energy acquisition following contrast agent injection to improve mammography sensitivity. CESM is comparable to contrast-enhanced MRI in terms of sensitivity, at a fraction of the cost. However, since lesion variability is large, even with the improved visibility provided by CESM, differentiation between benign and malignant enhancement is not accurate and a biopsy is usually performed for final assessment...
October 26, 2018: International Journal of Computer Assisted Radiology and Surgery
Nadine Spahr, Smita Thoduka, Nasreddin Abolmaali, Ron Kikinis, Andrea Schenk
PURPOSE: Multimodal imaging plays a key role in patient assessment and treatment planning in liver radioembolization. It will reach its full potential for convenient use in combination with deformable image registration methods. A registration framework is proposed for multimodal liver image registration of multi-phase CT, contrast-enhanced late-phase T1, T2, and DWI MRI sequences. METHODS: A chain of four pair-wise image registrations based on a variational registration framework using normalized gradient fields as distance measure and curvature regularization is introduced...
October 22, 2018: International Journal of Computer Assisted Radiology and Surgery
Johannes Bopp, Veronika Ludwig, Maria Seifert, Georg Pelzer, Andreas Maier, Gisela Anton, Christian Riess
PURPOSE: Two phase gratings in an X-ray grating interferometers can solve several technical challenges for clinical use of X-ray phase contrast. In this work, we adapt and evaluate this setup design to clinical X-ray sources and detectors in a simulation study. METHODS: For a given set of gratings, we optimize the remaining parameter space of a dual-phase grating setup using a numerical wave front simulation. The simulation results are validated with experimentally obtained visibility measurements on a setup with a microfocus tube and a clinical X-ray detector...
October 22, 2018: International Journal of Computer Assisted Radiology and Surgery
Shin-Ting Wu, Wallace Souza Loos, Dayvid Leonardo de Castro Oliveira, Fernando Cendes, Clarissa L Yasuda, Enrico Ghizoni
PURPOSE: Visualizing a brain in its native space plays an essential role during neurosurgical planning because it allows the superficial cerebral veins and surrounding regions to be preserved. This paper describes the use of a visualization tool in which single gadolinium contrast-enhanced T1-weighted magnetic resonance imaging was applied in nondefective and nonresective skulls to promote visualization of important structures. METHODS: A curvilinear reformatting tool was applied on the supratentorial compartment to peel the tissues to the depth of the dura mater and thereby revealing cortical and vascular spatial relationships...
October 20, 2018: International Journal of Computer Assisted Radiology and Surgery
Xia Zhong, Norbert Strobel, Annette Birkhold, Markus Kowarschik, Rebecca Fahrig, Andreas Maier
PURPOSE: With the recent introduction of fully assisting scanner technologies by Siemens Healthineers (Erlangen, Germany), a patient surface model was introduced to the diagnostic imaging device market. Such a patient representation can be used to automate and accelerate the clinical imaging workflow, manage patient dose, and provide navigation assistance for computed tomography diagnostic imaging. In addition to diagnostic imaging, a patient surface model has also tremendous potential to simplify interventional imaging...
October 13, 2018: International Journal of Computer Assisted Radiology and Surgery
Chunxia Qin, Zhenggang Cao, Shengchi Fan, Yiqun Wu, Yi Sun, Constantinus Politis, Chunliang Wang, Xiaojun Chen
PURPOSE: Surgical navigation system (SNS) has been an important tool in surgery. However, the complicated and tedious manual selection of fiducial points on preoperative images for registration affects operational efficiency to large extent. In this study, an oral and maxillofacial navigation system named BeiDou-SNS with automatic identification of fiducial points was developed and demonstrated. METHODS: To solve the fiducial selection problem, a novel method of automatic localization for titanium screw markers in preoperative images is proposed on the basis of a sequence of two local mean-shift segmentation including removal of metal artifacts...
October 13, 2018: International Journal of Computer Assisted Radiology and Surgery
Mathias Neugebauer, Lennart Tautz, Markus Hüllebrand, Simon Sündermann, Franziska Degener, Leonid Goubergrits, Titus Kühne, Volkmar Falk, Anja Hennemuth
PURPOSE: Various options are available for the treatment of mitral valve insufficiency, including reconstructive approaches such as annulus correction through ring implants. The correct choice of general therapy and implant is relevant for an optimal outcome. Additional to guidelines, decision support systems (DSS) can provide decision aid by means of virtual intervention planning and predictive simulations. Our approach on virtual downsizing is one of the virtual intervention tools that are part of the DSS workflow...
October 6, 2018: International Journal of Computer Assisted Radiology and Surgery
Ralf Stroop, Makoto Nakamura, Johan Schoukens, David Oliva Uribe
PURPOSE: Reliable intraoperative delineation of tumor from healthy brain tissue is essentially based on the neurosurgeon's visual aspect and tactile impression of the considered tissue, which is-due to inherent low brain consistency contrast-a challenging task. Development of an intelligent artificial intraoperative tactile perception will be a relevant task to improve the safety during surgery, especially when-as for neuroendoscopy-tactile perception will be damped or-as for surgical robotic applications-will not be a priori existent...
October 6, 2018: International Journal of Computer Assisted Radiology and Surgery
Christopher A Mela, David P Lemmer, Forrest Sheng Bao, Francis Papay, Tyler Hicks, Yang Liu
PURPOSE: In this paper, we present a vein imaging system to combine reflectance mode visible spectrum images (VIS) with transmission mode near-infrared (NIR) images in real time. Clear vessel localization is achieved in this manner with combined NIR-VIS dual-modal imaging. METHODS: Transmission and reflectance mode optical instrumentation is used to combine VIS and NIR images. Two methods of displaying the combined images are demonstrated here. We have conducted experiments to determine the system's resolution, alignment accuracy, and depth penetration...
October 5, 2018: International Journal of Computer Assisted Radiology and Surgery
Trevor K Stephens, John J O'Neill, Nathan J Kong, Mark V Mazzeo, Jack E Norfleet, Robert M Sweet, Timothy M Kowalewski
PURPOSE: This work presents an estimation technique as well as corresponding conditions which are necessary to produce an accurate estimate of grip force and jaw angle on a da Vinci surgical tool using back-end sensors alone. METHODS: This work utilizes an artificial neural network as the regression estimator on a dataset acquired from custom hardware on the proximal and distal ends. Through a series of experiments, we test the effect of estimation accuracy due to change in operating frequency, using the opposite jaw, and using different tools...
October 4, 2018: International Journal of Computer Assisted Radiology and Surgery
Kaiming Yin, Shiju Yan, Chengli Song, Bin Zheng
PURPOSE: Accurately detecting and removing pectoral muscle areas depicting on mediolateral oblique (MLO) view mammograms are an important step to develop a computer-aided detection scheme to assess global mammographic density or tissue patterns. This study aims to develop and test a new fully automated, accurate and robust method for segmenting pectoral muscle in MLO mammograms. METHODS: The new method includes the following steps. First, a small rectangular region in the top-left corner of the MLO mammogram which may contain pectoral muscle is captured and enhanced by the fractional differential method...
October 4, 2018: International Journal of Computer Assisted Radiology and Surgery
Stefan Jaeger, Octavio H Juarez-Espinosa, Sema Candemir, Mahdieh Poostchi, Feng Yang, Lewis Kim, Meng Ding, Les R Folio, Sameer Antani, Andrei Gabrielian, Darrell Hurt, Alex Rosenthal, George Thoma
PURPOSE: Tuberculosis is a major global health threat claiming millions of lives each year. While the total number of tuberculosis cases has been decreasing over the last years, the rise of drug-resistant tuberculosis has reduced the chance of controlling the disease. The purpose is to implement a timely diagnosis of drug-resistant tuberculosis, which is essential to administering adequate treatment regimens and stopping the further transmission of drug-resistant tuberculosis. METHODS: A main tool for diagnosing tuberculosis is the conventional chest X-ray...
October 3, 2018: International Journal of Computer Assisted Radiology and Surgery
Izumu Hosoi, Etsuko Kobayashi, Song Ho Chang, Takumi Matsumoto, Qi An, Emi Anzai, Yuji Ohta, Ichiro Sakuma
PURPOSE: Surgical reconstructions in three dimensions are needed for treatment of foot and ankle deformities. However, surgical results might be influenced by the skill and experience of doctors which complement the limited information for reconstructions in three dimensions. To solve these, studies were carried out to measure plantar pressure distribution during surgery. Though, it was impossible to accurately measure plantar pressure distribution accurately during operation. Therefore, we proposed an intraoperative plantar pressure measurement (IPPM) device that enables proper navigation in the push direction...
September 26, 2018: International Journal of Computer Assisted Radiology and Surgery
Jorge Bernal, Aymeric Histace, Marc Masana, Quentin Angermann, Cristina Sánchez-Montes, Cristina Rodríguez de Miguel, Maroua Hammami, Ana García-Rodríguez, Henry Córdova, Olivier Romain, Gloria Fernández-Esparrach, Xavier Dray, F Javier Sánchez
PURPOSE: Methodology evaluation for decision support systems for health is a time-consuming task. To assess performance of polyp detection methods in colonoscopy videos, clinicians have to deal with the annotation of thousands of images. Current existing tools could be improved in terms of flexibility and ease of use. METHODS: We introduce GTCreator, a flexible annotation tool for providing image and text annotations to image-based datasets. It keeps the main basic functionalities of other similar tools while extending other capabilities such as allowing multiple annotators to work simultaneously on the same task or enhanced dataset browsing and easy annotation transfer aiming to speed up annotation processes in large datasets...
September 25, 2018: International Journal of Computer Assisted Radiology and Surgery
Abeer AlHadidi, Beatriz Paniagua, Richard Cook, Donald Tyndall, Zaid Baqain, Lucia H Cevidanes
AIM: To evaluate the utility of an individualized template for corrective surgeries for patients suffering from mandibular asymmetry. MATERIALS AND METHOD: Twenty patients with history of favorable clinical outcome of the correction of their mandibular asymmetry were chosen. CBCTs were taken before and 6 weeks postoperative using NewTom 3G. Each volume is mirrored and registered on the cranial base. Surface models for the mandible and its registered mirror were used to compute a template using deformable fluid registration...
September 24, 2018: International Journal of Computer Assisted Radiology and Surgery
Pablo G Tahoces, Luis Alvarez, Esther González, Carmelo Cuenca, Agustín Trujillo, Daniel Santana-Cedrés, Julio Esclarín, Luis Gomez, Luis Mazorra, Miguel Alemán-Flores, José M Carreira
PURPOSE: The shape and size of the aortic lumen can be associated with several aortic diseases. Automated computer segmentation can provide a mechanism for extracting the main features of the aorta that may be used as a diagnostic aid for physicians. This article presents a new fully automated algorithm to extract the aorta geometry for either normal (with and without contrast) or abnormal computed tomography (CT) cases. METHODS: The algorithm we propose is a fast incremental technique that computes the 3D geometry of the aortic lumen from an initial contour located inside it...
September 22, 2018: International Journal of Computer Assisted Radiology and Surgery
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