8,047 Hits in 6.1 sec

A new model for the recovery of cylindrical structures from medical image data [chapter]

Thomas O'Donnell, Alok Gupta, Terrance Boult
1997 Lecture Notes in Computer Science  
h p á { e w x % m d x y D e á ï d y 6 U x v x f y 6 % i m x Ý ó ü yâ ìâä m y 6 e m Þ v x ì © Þ i G i f t ae  h p 6 y ' h Q m y h ôâ Imagë Image © Plane ¡ w !  ...  Q a B a 4 ' 3 2 " a " !  ... 
doi:10.1007/bfb0029241 fatcat:4nngfhp3e5dvtjcuvlb57cewmq

Performance of a novel collimator for high-sensitivity brain SPECT

Georges El Fakhri, Jinsong Ouyang, Robert E. Zimmerman, Alan J. Fischman, Marie Foley Kijewski
2005 Medical Physics (Lancaster)  
The new variable focusing collimator SensOgrade TM samples the projections unequally, with central regions more heavily represented, to compensate for attenuation of counts from central brain structures  ...  Data were acquired on the CeraSPECT TM scanner using both new and standard collimators.  ...  A collimator with a centrally peaked sensitivity profile has been manufactured for the Ceraspect brain scanner. 2 The aim of this work is to evaluate the improvements in performance in lesion detection  ... 
doi:10.1118/1.2143140 pmid:16485427 fatcat:qkuhciq4krg2ncradcasymwurq

Performance Simulation of an Ultrahigh Resolution Brain PET Scanner Using 1.2-mm Pixel Detectors

Emilie Gaudin, Maxime Toussaint, Christian Thibaudeau, Maxime Paille, Rejean Fontaine, Roger Lecomte
2019 IEEE Transactions on Radiation and Plasma Medical Sciences  
A reconstructed nearly isotropic spatial resolution of 1.3 mm FWHM is obtained at 10 mm from the center of the field of view.  ...  The simulation results provide evidence of the promising capabilities of the proposed scanner for ultra-high resolution brain imaging.  ...  for proof-reading of the manuscript.  ... 
doi:10.1109/trpms.2018.2877511 pmid:31453423 pmcid:PMC6709711 fatcat:7g6morcyarcmphnr7o5jvbxvky

3$\gamma $ Medical Imaging with a Liquid Xenon Compton Camera and $^{44}$Sc Radionuclide

J.P. Cussonneau, J.M. Abaline, S. Acounis, N. Beaupère, J.L. Beney, J. Bert, S. Bouvier, P. Briend, J. Butterworth, T. Carlier, H. Chanal, M. Cherel (+23 others)
2017 Acta Physica Polonica B  
This work has been supported in part by the European Union and the Région Pays de la Loire in France and by grants from the French National Agency for Research, "Investissements d'Avenir" ArronaxPlus Equipex  ...  (Received October 3, 2017) The development of a liquid xenon Compton camera called XEMIS2 (XEnon Medical Imaging System) is a step forward to a new type of medical imaging based on the use of 44 Sc radionuclide  ...  The lines (red) correspond to the fit of our data with the parameterized Thomas et al. model [10] .  ... 
doi:10.5506/aphyspolb.48.1661 fatcat:mej2ispcibgdrcaridfraucz6e

Recovery of total I-131 activity within focal volumes using SPECT and 3D OSEM

Kenneth F Koral, Anastasia Yendiki, Yuni K Dewaraja
2007 Physics in Medicine and Biology  
For a test case with HE collimation, increasing the projection-image sampling density while decreasing the image voxel size increased the recovery coefficient by 0.075 on average, and, if used in a full  ...  Using appropriately-different 3D models of the point source response function for the two types of collimation, approximately the same recovery of activity could be achieved with either collimation by  ...  Conclusions When the 3D model used in reconstruction is adjusted for the type of collimation, recovery of the I-131 activity in spheres of various sizes placed within a cylindrical phantom and imaged with  ... 
doi:10.1088/0031-9155/52/3/017 pmid:17228120 fatcat:tp222akukjgpfgfpm7d7iazriy

Cherenkov excited phosphorescence-based pO2estimation during multi-beam radiation therapy: phantom and simulation studies

Robert W Holt, Rongxiao Zhang, Tatiana V Esipova, Sergei A Vinogradov, Adam K Glaser, David J Gladstone, Brian W Pogue
2014 Physics in Medicine and Biology  
To simulate a realistic situation of EBRT, where the size and location of the tumor is well known, spatial information of a prescribed region was utilized in the recovery estimation.  ...  Finally, a simulation study was performed showing that pO 2 in human brain tumors can be measured to within 15mmHg for edge depths less than 10-20mm using the Cherenkov Excited Phosphorescence Oxygen imaging  ...  Support of the Penn Medicine Neuroscience Center is gratefully acknowledged.  ... 
doi:10.1088/0031-9155/59/18/5317 pmid:25146556 pmcid:PMC4259158 fatcat:52jkh43agjcy3hromq5qwrzc5e

Craniofacial Reconstruction with Personalized Lightweight Scaffold Fabricated Using Electron-Beam Additive Manufacturing

Khaja Moiduddin, Syed Hammad Mian, Sherif Mohammed Elseufy, Basem Motea Abdullah Abdo, Mohamed Kamaleldin Aboudaif, Hisham Alkhalefah
2022 Metals  
Implants are the most popular option for restoring the facial anatomy in the event of a mishap.  ...  The goal of this research is to investigate the use of scaffolds for craniofacial reconstruction and their fabrication using electron-beam additive manufacturing (EBAM).  ...  Conflicts of Interest: The authors declare no conflict of interest.  ... 
doi:10.3390/met12040552 fatcat:ctf3u25hwrh2pijag4rb6lacgi

A Clinical and Experimental Comparison of Time of Flight PET/MRI and PET/CT Systems

Daniela E. Oprea-Lager, Maqsood Yaqub, Indra C. Pieters, Rinze Reinhard, Reindert J. A. van Moorselaar, Alfons J. M. van den Eertwegh, Otto S. Hoekstra, Adriaan A. Lammertsma, Ronald Boellaard
2015 Molecular Imaging and Biology  
Purpose: The purpose of the study was to compare image quality and quantitative accuracy of positron emission tomography/magnetic resonance imaging (PET/MRI) and PET/computed tomography (PET/CT) systems  ...  Thirty-four lesions with comparable PET image quality were identified. Lesional SUVmax differences of 4±26 % between PET/MRI and PET/CT data were observed (R 2 =0.79, slope=1.02).  ...  The Department of Radiology and Nuclear Medicine of the VU University Medical Center, Amsterdam, the Netherlands, has an ongoing collaboration with Philips Healthcare. Ethical Approval.  ... 
doi:10.1007/s11307-015-0826-8 pmid:25690949 pmcid:PMC4768240 fatcat:p7eupraja5chpdgzd5eqay3x5i

Comparison of a standard resolution PET-CT scanner with an HRRT brain scanner for imaging small tumours within the head

Jose M. Anton-Rodriguez, Peter Julyan, Ibrahim Djoukhadar, David Russell, D. Gareth Evans, Alan Jackson, Julian C. Matthews
2019 IEEE Transactions on Radiation and Plasma Medical Sciences  
The HRRT images, although noisier, resulted in higher contrast recovery for the smallest cylindrical inserts in comparison to TrueV with and without RM.  ...  assess the utility of conventional scanners for brain scanning.  ...  Anup for their efforts and help in the recruitment of patients at the Highly Specialised Commissioned NF2 Service, Central Manchester University Hospital NHS Foundation Trust.  ... 
doi:10.1109/trpms.2019.2914909 fatcat:e2vd667jlnauzmg3y4kxu6pzku

3D face shape approximation from intensities using Partial Least Squares

Mario Castelan, Johan Van Horebeek
2008 2008 IEEE Computer Society Conference on Computer Vision and Pattern Recognition Workshops  
Using the intensity model, a set of parameters is obtained from out-of-training intensity examples.  ...  In this paper, we apply Partial Least Squares (PLS) regression to predict 3D face shape from a single image.  ...  They developed a novel method for 3D facial shape recovery from a single image using a single 3D reference surface height model of a different face.  ... 
doi:10.1109/cvprw.2008.4563049 dblp:conf/cvpr/CastelanH08 fatcat:gavl54pba5bdxcl4m7ivnsqrji

A Degenerate Conic-Based Method for a Direct Fitting and 3-D Pose of Cylinders with a Single Perspective View

Christophe Doignon, Michel de Mathelin
2007 Engineering of Complex Computer Systems (ICECCS), Proceedings of the IEEE International Conference on  
In this paper, we address the problem of the pose recovery of a straight homogeneous circular cylinder (SHCC) from its apparent contour in a single 2-D image.  ...  In many real-world situations, one may encounter cylindrical objects especially in man-made structures Object models based on surfaces of revolution, in particular cylinders, are suitable for many fields  ...  Motivations The recovery of the 3-D information from 2-D images is a fundamental problem in computer vision and for the past four decades, the model-based pose estimation has been widely addressed.  ... 
doi:10.1109/robot.2007.364128 dblp:conf/icra/DoignonM07 fatcat:xuli7xvtqzbizfdw7oeg7sjg4q

Reconstruction of Time-of-Flight Projection Data with the STIR reconstruction framework

Nikos Efthimiou, Elise Emond, Chris Cawthorne, Charalampos Tsoumpas, Kris Thielemans
2017 2017 IEEE Nuclear Science Symposium and Medical Imaging Conference (NSS/MIC)  
Using Monte Carlo simulations, as well as cylindrical and XCAT phantoms analytically projected, we calculate the contrast recovery ratio over a wide range of iterations.  ...  This manuscript gives an update on the integration of capabilities to handle Time-Of-Flight (TOF) Positron Emission Tomography (PET) data into the STIR image reconstruction toolkit.  ...  return a data-structure of the same dimension as in the non-TOF case.  ... 
doi:10.1109/nssmic.2017.8533081 fatcat:zmfiaji6mrbotldoyxf6hiyuty

Detailed Human Shape and Pose from Images

Alexandru O. Balan, Leonid Sigal, Michael J. Black, James E. Davis, Horst W. Haussecker
2007 2007 IEEE Conference on Computer Vision and Pattern Recognition  
Our results show that such rich generative models enable the automatic recovery of detailed human shape and pose from images.  ...  Previous work showed that the parameters of the SCAPE model could be estimated from marker-based motion capture data. Here we go further to estimate the parameters directly from image data.  ...  Our contribution provides a method for fitting the pose and shape parameters of the model to image data.  ... 
doi:10.1109/cvpr.2007.383340 dblp:conf/cvpr/BalanSBDH07 fatcat:m6j7sl6mvjdzfbzgybix4qap7q

Electrical Capacitance Volume Tomography Static Imaging by Non-Optimized Compressive Sensing Framework

Nur Afny Catur Andryani, Dodi Sudiana, Dadang Gunawan
2016 Journal of ICT Research and Applications  
Compressive sensing (CS) is a framework that enables the recovery of a sparse signal or a signal that can be represented as sparse in a certain domain, by having a lower dimension of measurement data compared  ...  This paper discusses the possibility of developing an ECVT imaging technique for static objects based on a CS framework.  ...  Acknowledgements The authors would like to thank CTech Lab Edwar Technology for their supportive discussions and research resources and Tanri Abeng University for their support.  ... 
doi:10.5614/itbj.ict.res.appl.2016.10.3.4 fatcat:v2vjyhsg7rfkxjnw2vhfqsuzqm

Remote positioning optical breast magnetic resonance coil for slice-selection during image-guided near-infrared spectroscopy of breast cancer

Michael A. Mastanduno, Shudong Jiang, Roberta DiFlorio-Alexander, Brian W. Pogue, Keith D. Paulsen
2011 Journal of Biomedical Optics  
An example of human breast imaging through the new interface is shown and a discussion of how it compares to other patient interfaces for breast imaging is presented.  ...  Reconstructions with data taken in the new interface show acceptable linearity over different absorber concentrations (residual norm = 0.067), and exhibit good contrast recovery at different imaging planes  ...  Acknowledgments The authors would like to gratefully acknowledge the help and work of Dr. Colin M. Carpenter in the early development of the MR-NIR system at Dartmouth.  ... 
doi:10.1117/1.3587631 pmid:21721802 pmcid:PMC3133798 fatcat:kbh2phyuefhlfej6liinaaz2em
« Previous Showing results 1 — 15 out of 8,047 results