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    Archived pages: 2 . Archive date: 2014-10.

  • Title: SIMRI
    Descriptive info: .. SIMRI.. A versatile and interactive 3D MRI simulator.. Download.. Purpose and Context.. MRI simulation is an important counterpart to MRI acquisitions.. Simulation is naturally suited to acquire theoretical understanding of the complex MR technology.. It can be used as an educational tool in medical and technical environments.. MRI simulation permits the investigation of artifact causes and effects.. Likewise simulation may help in the development and optimization of MR sequences.. Finally, with the increased interest in computer-aided MRI image analysis methods (segmentation, data fusion, quantization.. ), an MRI simulator provides an interesting assessment tool since it generates 3D realistic images from medical virtual objects perfectly known.. In this context, we develop the.. simulator.. Based on the Bloch equations, it includes an efficient management of the.. T.. 2.. * effect.. It takes into account the main static field value and enables realistic simulations of the.. chemical shift artifact.. including off-resonance phenomena.. It also simulates the artifacts linked to the.. static field inhomogeneity.. like those induced by.. susceptibility.. variation within an object.. It is implemented in the C language and the MRI sequence programming is done using high level C functions with a simple programming interface.. To manage large simulations, the magnetization kernel is implemented in a.. parallelized.. way that enables simulation on PC grid architecture.. Furthermore, this simulator includes a 1D.. interactive.. interface for pedagogic purpose illustrating the magnetization vector motion as well as the MRI contrast.. It enables the simulation images taking into account.. B1 map.. Overview.. The simulator overview is given below.. From a 3D virtual object, the static field definition and an MRI sequence, the magnetization kernel computes a set of RF signals, i.. e the k-space.. To simulate realistic images, noise can be added to the k-space, which can be filtered like in a real imager before the reconstruction of the MR image (Modulus and phase) using Fast Fourier transform.. At the moment,.. contains Spin Echo, Gradient Echo sequences for 1D, 2D and 3D images as well as their turbo versions.. It contains also FISP, saturation-recovery as well as inversion-recovery sequences.. The whole code of the.. simulator is written in ANSI C language and separated in different software modules working identically under.. Microsoft.. Windows.. and.. Linux.. operating systems.. The whole simulation package is linked into a dynamic library wrapped for being used with the.. Python.. scripting  ...   computing architecture", in.. IEEE CGIGRID'03- BIOGRID'03.. , Tokyo, pp.. 582-587 (2003).. Main authors.. Hugues BENOIT-CATTIN.. CREATIS-LRMN, UMR CNRS #5520, U 630 Inserm, Université Claude Bernard Lyon 1, INSA Lyon, Bât.. B.. Pascal, 69621 Villeurbanne, France.. Guylaine COLLEWET.. CEMAGREF / Food Processes Engineering Research Unit, 17 av de Cucillé, 35044 Rennes, France.. Boubakeur BELAROUSSI.. Pascal, 69621 Villeurbanne, France.. Christophe ODET.. Hervé SAINT-JALMES.. Fabrice BELLET.. License.. The SIMRI software is distributed under the CeCiLL license (.. http://www.. cecill.. info/index.. en.. html.. ).. The CeCiLL license is a free-software license, created under the supervision of the three biggest research institutions on computer sciences in France :.. CNRS (.. cnrs.. fr.. CEA (.. cea.. INRIA (.. inria.. ).. The CeCiLL license is compatible with the GNU GPL : you can legally redistribute SIMRI based programs in GPL.. You have to RESPECT this license.. Particularly, all distributed programs using parts of the SIMRI sources MUST be open-source.. Please carefully read the license terms.. Collaborations Acknowledgements.. Our main collaborators on the SIMRI development are G.. Collewet (.. CEMAGREF / Food Processes Engineering Research Unit, Rennes, France.. ) and H.. Saint-Jalmes (.. LRMN-MIB, UMR CNRS 5012,Lyon France.. Many thanks to A.. Amadon (CEA, SHFJ-UNAF, Orsay, France) for his contribution on B1 map integration.. The.. project has been initiated thanks to the work done by G.. Soufflet and H.. Saint-Jalmes on the initial 1D MRI simulator of J.. Bittoun.. We want to thank S.. Balac from the CNRS MAPLY lab for its contribution on the susceptibility artifact simulation.. Many thanks to F.. Bellet and J.. Montagnat for their help in the.. parallelization and grid implementation, to G.. Bonnilo and L.. Alexandre for their work on the 1D interface and to T.. Lamotte for his contribution on the chemical shift artifact.. This work is partly supported by the IST European Data-Grid Project, the IST European EGEE and EGEE-2 projects.. and the French ministry for research ACI-GRID project.. This work has been also funded by the INSA Lyon.. The SIMRI project is also part of the I3M Région Rhône Alpes cluster project.. Download the SIMRI code.. -.. Version 2.. 0.. (20 Déc.. 2006).. Version 1.. (8 Nov.. 2005).. SIMRI mailing list.. Simri has its mailing list: simri at creatis.. insa-lyon.. If you are interested, subscribe to the simri mailing list.. creatis.. fr/mailman/listinfo/simri.. SIMRI funding institutions.. (Last web page update 30/05/2007)..

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  • Title: SIMRI: interactive interface
    Descriptive info: Interactive interface:.. The whole SIMRI simulation package is linked into a dynamic library wrapped for being used with the.. Such a library has been used to develop an interactive portable 1D simulator for pedagogic purposes which is illustrated below.. Overview of the general interface.. The figure given below presents the main window of this interface.. The left upper part of the window presents the.. r.. ,.. 1.. profiles of the virtual object along the 1D direction.. On this example, the object is composed of four different homogeneous parts.. This profile can be interactively defined by the user.. The user is also able to define a main field inhomogeneity profile associated to the object.. The object definition can be saved on disk and reloaded.. Note that up to two isochromats can be defined for an object corresponding to the water and fat protons.. The bottom part of the window concerns the sequence type and parameters that can be modified interactively, impacting the 1D MRI signal.. The signal is displayed in the right upper part of the window.. User can choose to display the RF signal through its module, phase, real and imaginary part.. The reconstructed signal can be displayed as a signal and as  ...   idea of the.. is to offer a 3D visualization of the object spin magnetization vectors within the rotating frame during a sequence.. Such visualization is presented c) with four spin magnetization vectors represented by the arrows.. The user can configure (b) the number of spin magnetization vectors to view and their characteristics (.. He can also save or load different vector sets.. The user can design a sequence by chaining events like RF pulse, gradient and precession (a).. User sequence definition can be save and/or load.. Once a sequence and a spin magnetization vector set are defined, the user chooses the display speed and the trace length of the spin vectors and then plays the sequence.. During the play, the user observes the vector motions (Figure 24-c) and also the RF signals that would be acquired by two coils placed on the x and y axis as well as the magnitude of the combined complex signal (d).. Note that the user can interact (zoom, rotation, translation) with the 3D spin vector visualization window during the play.. a) Sequence definition.. b) Spin magnetization vector configuration.. c) 3D view of the spin magnetization vectors.. d) Signal detected by orthogonal coils placed in the x-y plane..

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