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2011 8th IEEE International Symposium on Biomedical Imaging: From Nano to Macro, ISBI'11

作者： Noe, Karsten Ø. Tanderup, Kari Sorensen, Thomas S. Computer Graphics Lab Alexandra Institute Denmark Department of Oncology Aarhus University Hospital Denmark Department of Computer Science Aarhus University Denmark Institute of Clinical Medicine Aarhus University Denmark

ISBN: (纸本)9781424441280

A new optimisation strategy for surface mesh registration is proposed based on energy minimisation of an elastic surface membrane. The energy term is evaluated in three-dimensional space, optimisation however is performed while constraining the moving surface to a parametrised spherical space of the fixed surface. Optional landmark based matches can be included in the suggested iterative solver. The technique is demonstrated for bladder registration in brachytherapy treatment evaluation of cervical cancer. It holds promise to better estimate the accumulated but unintentional dose delivered to organs at risk. © 2011 IEEE.

关键词： Radiotherapy

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EEG-based measurement of subjective parameters in evaluations

EEG-based measurement of subjective parameters in evaluation...

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14th International Conference on Human-computer Interaction, HCI International 2011

作者： Cernea, Daniel Olech, Peter-Scott Ebert, Achim Kerren, Andreas Department of Computer Science Computer Graphics and HCI Group University of Kaiserslautern P.O. Box 3049 D-67653 Kaiserslautern Germany Computer Science Department ISOVIS Group Linnaeus University Vejdes Plats 7 SE-35195 Växjö Sweden

ISBN: (纸本)9783642220944

Evaluating new approaches, be it new interaction techniques, new applications or even new hardware, is an important task, which has to be done to ensure both usability and user satisfaction. The drawback of evaluating subjective parameters is that this can be relatively time consuming, and the outcome is possibly quite imprecise. Considering the recent release of cost-efficient commercial EEG headsets, we propose the utilization of electro-encephalographic (EEG) devices for evaluation purposes. The goal of our research is to evaluate if a commercial EEG headset can provide cutting-edge support during user studies and evaluations. Our results are encouraging and suggest that wireless EEG technology is a viable alternative for measuring subjectivity in evaluation scenarios. © 2011 Springer-Verlag.

关键词： Brain computer interface

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An approach for robot-assisted biosensing: Demonstration with MRI-guided MR spectroscopy

An approach for robot-assisted biosensing: Demonstration wit...

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10th IEEE International Workshop on Biomedical Engineering, BioEng 2011

作者： Sonmez, Ahmet E. Hedayati, Yousef Webb, Andrew G. Deng, Zhigang Navkar, Nikhil Tsekos, Nikolaos V. Medical Robotics Laboratory Department of Computer Science University of Houston Houston TX 77204 United States Computer Graphics and Interactive Media Laboratory Department of Computer Science University of Houston Houston TX 77204 United States Department of Radiology Leiden University Medical Centre Leiden Netherlands

ISBN: (纸本)9781457705526

Emerging and established methods, such as optical imaging and MR spectroscopy (MRS), offer new opportunities for in situ biosensing. The limited tissue penetration of these modalities can be addressed by locally placing the sensor via minimally invasive trans-needle or trans-catheter access. This work introduces a generic system that mechanically scans an area of interest with a sensor, capable of generating 1D scans while registering them to a guiding modality. computer simulations illustrate the operation of this approach for a miniature RF coil as the mechanically scanned biosensor. Experimental studies demonstrated the approach on phantoms, using MRI as the guiding modality, and an MR-compatible manipulator, which carried a miniature RF coil, was used to scan and collect MRS and generated 1D MRS scans co-registered to the guiding MRI. © 2011 IEEE.

关键词： Robotics

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Sampling step importance in hierarchical semantic segmentation of microscopic images

Sampling step importance in hierarchical semantic segmentati...

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15th International Conference on System Theory, Control and Computing, ICSTCC 2011

作者： Smochina, Cristian Manta, Vasile Kropatsch, Walter Department of Computer Science and Engineering Gheorghe Asachi Technical University of Iasi Romania Pattern Recognition and Image Processing Group Institute of Computer Graphics and Algorithms Vienna University of Technology Austria

ISBN: (纸本)9781457711732

The objective of semantic segmentation in microscopic images is to extract the cellular, nuclear or tissue components. This problem is challenging due to the large variations of these components features (size, shape, orientation or texture). In this paper we improve the technique presented in [17] used to identify the epithelial nuclei (crypt) against interstitial nuclei in microscopic images taken from colon tissues. In the proposed enhanced approach, the crypt inner boundary is detected using the closing morphological pyramid instead of morphological hierarchy. The outer crypt border is determined by the epithelial nuclei, overlapped by the maximal isoline of the inner boundary. The use of sampling in building the pyramid offers computational efficiency, reduces the amount of used memory, increase the robustness and preserve the quality results. An analysis of the two approaches is performed considering the number of pixels processed to create each level. Also the relation between the levels of the hierarchical structures is established. © 2011 Faculty of Auto Control.

关键词： Computational efficiency

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Visual separation in mobile multi-display environments 11

Visual separation in mobile multi-display environments

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24th Annual ACM Symposium on User Interface Software and Technology, UIST'11

作者： Cauchard, Jessica R. Löchtefeld, Markus Irani, Pourang Schoening, Johannes Krüger, Antonio Fraser, Mike Subramanian, Sriram University of Bristol Bristol Interaction and Graphics Dept. of Computer Science Woodland Rd Bristol BS8 1UB United Kingdom Stuhlsatzenhausweg 3 66123 Saarbrücken Germany University of Manitoba Computer Science Department Human-Computer Interaction Lab. Winnipeg Manitoba Canada

ISBN: (纸本)9781450307161

Projector phones, handheld game consoles and many other mobile devices increasingly include more than one display, and therefore present a new breed of mobile Multi-Display Environments (MDEs) to users. Existing studies illustrate the effects of visual separation between displays in MDEs and suggest interaction techniques that mitigate these effects. Currently, mobile devices with heterogeneous displays such as projector phones are often designed without reference to visual separation issues;therefore it is critical to establish whether concerns and opportunities raised in the existing MDE literature apply to the emerging category of Mobile MDEs (MMDEs). This paper investigates the effects of visual separation in the context of MMDEs and contrasts these with fixed MDE results, and explores design factors for Mobile MDEs. Our study uses a novel eye-tracking methodology for measuring switches in visual context between displays and identifies that MMDEs offer increased design flexibility over traditional MDEs in terms of visual separation. We discuss these results and identify several design implications. © 2011 ACM.

关键词： Separation

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Examining the effects of embedded vibrotactile feedback on the feel of a digital musical instrument

Examining the effects of embedded vibrotactile feedback on t...

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International conference on New Interfaces for Musical Expression, NIME 2011

作者： Marshall, Mark T. Wanderley, Marcelo M. Interaction and Graphics Group Department of Computer Science University of Bristol United Kingdom Input Devices and Musical Interaction Laboratory Music Technology Area McGill University Canada

This paper deals with the effects of integrated vibrotactile feedback on the "feel" of a digital musical instrument (DMI). Building on previous work developing a DMI with integrated vibrotactile feedback actuators, we discuss how to produce instrument-like vibrations, compare these simulated vibrations with those produced by an acoustic instrument and examine how the integration of this feedback effects performer ratings of the instrument. We found that integrated vibrotactile feedback resulted in an increase in performer engagement with the instrument, but resulted in a reduction in the perceived control of the instrument. We discuss these results and their implications for the design of new digital musical instruments. © 2020, Steering Committee of the International Conference on New Interfaces for Musical Expression.

关键词： Musical instruments

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Visibly accurate model-based binary image compression scheme

Visibly accurate model-based binary image compression scheme

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2011 2nd IEEE International Conference on Signal and Image Processing Applications, ICSIPA 2011

作者： Alzahir, Saif Image Processing Graphics and Multimedia Lab Computer Science Department UNBC Prince George BC V2N 4Z9 Canada

ISBN: (纸本)9781457702419

In this paper we propose a model-based binary image compression scheme. In this scheme, we merge one-dimensional (1-D) blocks of black pixels of the input binary image with those in consecutive rows into larger blocks using mathematical models that preserve the quality of the image. This process reduces the number of vertices when the image is segmented into rectangles for compression. The top-left and the bottom-right vertices of each generated rectangle are then identified and the coordinates of which are efficiently encoded. The model for merging the blocks was obtained through extracting the data values involving the blocks of various widths and the subjective tolerance of an average viewer. The data values are then plotted on a Cartesian plane and approximated with linear, logarithmic, and polynomial functions. Simulation results show that the images after merging using the proposed model have less number of rectangles without any obvious image distortion and have higher compression ratio those rectangular partitioning methods in the literature. © 2011 IEEE.

关键词： Merging

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Structure-based evaluation methodology for curvilinear structure detection algorithms

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Lecture Notes in computer science (including subseries Lecture Notes in Artificial Intelligence and Lecture Notes in Bioinformatics) 2011年 6658 LNCS卷 305-314页

作者： Jiang, Xiaoyi Lambers, Martin Bunke, Horst Department of Computer Science University of Münster Germany Computer Graphics Group University of Siegen Germany Institute of Computer Science and Applied Mathematics University of Bern Switzerland

ISBN: (纸本)9783642208430

Curvilinear structures are useful features, particularly in medical image analysis. Typically, a pixel-wise comparison with manually specified ground truth is used for performance evaluation. In this paper we propose a novel structure-based methodology for evaluating the performance of curvilinear structure detection algorithms. We consider the two aspects of performance, namely detection rate and detection accuracy, separately. This is in contrast to their mixed handling in earlier approaches that typically produces biased impression of detection quality. The proposed performance measures provide a more informative and precise performance characterization. A series of experiments in the context of retinal vessel detection are presented to demonstrate the advantages of our approach. © 2011 Springer-Verlag Berlin Heidelberg.

关键词： Signal detection

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On the Complexity of Time-Dependent Shortest Paths 11

On the Complexity of Time-Dependent Shortest Paths

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Annual ACM-Society for Industrial and Applied Mathmatics Symposium on Discrete Algorithms

作者： Luca Foschini John Hershberger Subhash Suri Department of Computer Science University of California Mentor Graphics Corp

ISBN: (纸本)9780898719932

We investigate the complexity of shortest paths in time-dependent graphs, in which the costs of edges vary as a function of time, and as a result the shortest path between two nodes s and d can change over time. Our main result is that when the edge cost functions are (polynomial-size) piecewise linear, the shortest path from s to d can change n~(Θ(log n)) times, settling a several-year-old conjecture of Dean [Technical Reports, 1999, 2004]. We also show that the complexity is polynomial if the slopes of the linear function come from a restricted class, present an output-sensitive algorithm for the general case, and describe a scheme for a (1 +ε)-approximation of the travel time function in near-quadratic space. Finally, despite the fact that the arrival time function may have superpolynomial complexity, we show that a minimum delay path for any departure time interval can be computed in polynomial time.

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The tumor therapy manager - Design, refinement and clinical use of a software product for ENT surgery planning and documentation

The tumor therapy manager - Design, refinement and clinical ...

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Lecture Notes in computer science

作者： Rössling, Ivo Dornheim, Jana Dornheim, Lars Boehm, Andreas Preim, Bernhard Otto-von-Guericke University Faculty of Computer Science Department of Simulation and Graphics Magdeburg Germany Dornheim Medical Images GmbH Magdeburg Germany University of Leipzig Medical Faculty Germany

ISBN: (纸本)9783642215032

The treatment of patients with head and neck cancers is a demanding medical field, due to the compact anatomy and complex functionality of the affected region. The planning process comprises issues regarding risk and applicability of intervention, extent of surgical removal, and the choice of appropriate access to the pathology. Required clinical information are obtained from different examinations, ranging from external visual and palpatory inspection, over preoperative panendoscopy and biopsy histology to radiological imaging. The surgeon needs to process all available information in mind and virtually compile a mental patient model of the target anatomy. 3D visualizations of tomographic data may improve perception of spatial relationships. However, discussions with clinical practicians reveal that parameterization of advanced visual effects tend to be cumbersome and resulting visualizations are often too complex and not dedicated to specific diagnostic or treatment planning questions. Moreover, they will add valuable alternative views, but cannot replace all the other diagnostic sources. We describe long-term experiences on developing and refining a software for ENT surgery planning and documentation. Regarding 3D visualizations, it turns out to be superior to generate sequences of rather simple 3D views directly supporting specific treatment questions, instead of presenting many anatomic structures simultaneously. Developing software for clinical practice thereby benefits from a thorough understanding of the target scenarios and the "visual questions" they raise. The second focus is on the seamless integration of the different diagnostic modalities, findings, and therapy decisions into a common electronic document. We report on the actual clinical use of the system and discuss how it fits into the surgical planning workflow. © 2011 Springer-Verlag.

关键词： Tomography

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