Activity for MRiLab
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shahrokh posted a comment on discussion General Discussion
Hi Dear developers and users: At firstly I mentioned that I use MATLAB Version: 9.0.0.341360 (R2016a) and MRiLab Version: 1.3 in Fedora core 25. I want to simulate spin echo imaging sequence using “Brain Tissue” phantom. On page 423 of the book titled “The Essential Physics of Medical Imging” by Jerrold T. Bushberg (third edition), it is mentioned that “T1- weighted SE contrast therefore requires a short TR and a short TE”. This concept is illustrated in the figure (Figure 12-25) by using T1-weighted...
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Fang Liu modified a comment on discussion General Discussion
MaxGrad (T/m) : Maximum allowable gradient strength MaxSlewRate (T/m/s) : Maximum allowable gradient slew rate First of all, please make sure you are using the correct number in the same unit. Check the sequence waveform to avoid waveform overlapping from multiple gradients. You might also want to check the parameters that are relevant to image resolution because they determine the gradeint amplitude. You can also first try avoiding the errors and simulate the images by using higher limits of MaxGrad...
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MaxGrad (T/m) : Maximum allowable gradient strength MaxSlewRate (T/m/s) : Maximum allowable gradient slew rate First of all, please make sure you are using the correct number in the same unit. Check the sequence waveform to avoid waveform overlapping from multiple gradients. You might also want to check the parameters that are relevant to image resolution because they determine the gradeint amplitude. You can also first try avoiding the errors and simulate the images by using higher limits of MaxGrad...
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imageanalyst posted a comment on discussion General Discussion
Dear All, Whilst simulating a low-field magnet I've been running into the GyP/GxR exceed maximum allowed gradient amplitude/slew rate errors, despite using very low values of these. I've included what I think may be relevant parameter values below, extracted from the paper which I am trying to replicate: MaxGrad: 1e-3 MaxSlewRate: 0.7 B0: 0.0065 TE: 11e-3 TR: 22.5e-3 Other parameters being set to the FIESTA sequence defaults. I would have thought that these would result in my gradients being too...
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Vitaliy posted a comment on discussion General Discussion
Could you please, assist me with installing this package? I have ubuntu 18.04 with Intel C/C++ compiler. Even though I set the path ISMRMRD_SCHEMA_DIR=~/ismrmrd/. cmake can't locate it. Here is output of cmake -- MATLAB_ROOT: /usr/local/MATLAB/R2018a/ -- Matlab mex will be used -- IPP_ROOT (IPP 7): /home/vitaliy/intel/compilers_and_libraries_2019.3.199/linux/ipp/ -- FRAMEWAVE_ROOT environment variable not set. -- In Linux this can be done in your user .bashrc file by appending the corresponding line,...
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Lambert posted a comment on discussion General Discussion
Thank you I will check the sequence waveform. For the rest I cannot reduce the bandwith because I want even increase the bandwith upto 256k. Increasing the MaxSlewRate without checking the sequence waveform gave me an image with a kind of k space and not an image (this image looked like an image when gradients are not working)
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You might want to check the sequence waveform and make sure no waveform overlap before performing simulation. Also, you might want to reduce bandwidth. Finally, you can set MaxSlewRate (in Hardware tab) to an extreme large number to ignore this warning if you are sure nothing else is wrong.
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Dear all, I tried to simulate a PSD_GRE3D with multiecho checked. With TE=1.2 ms (first echo) than echo spacing of 1.2 ms, I have the following error dialog: GxR exceeds maximum allowed gradient slew rate. How can I manage to perform my simulation ? Best Regards Simon Lambert
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N_K modified a comment on discussion General Discussion
Thanks Fang. is it possible to add dummy pulse with an EPI sequence? is there any checkpoints that I have to take into consideration when implementing a CEST module in a sequence? ALSO I'M TRYING TO ADD an EPI MODULE to a sequence from scratch. ERROR: Reference to non-existent field 'EPI_ETL'? I'm probably missing something?????
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Thanks Fang. is it possible to add dummy pulse with an EPI sequence? is there any checkpoints that I have to take into consideration when implementing a CEST module in a sequence? ALSO I'M TRYING TO ADD an EPI MODULE to a sequence from scratch. ERROR: Reference to non-existent field 'EPI_ETL'? I'm probably missing something?????
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Thanks Fang. is it possible to add dummy pulse with an EPI sequence? is there any checkpoints that I have to take into consideration when implementing a CEST module in a sequence?
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Thanks Fang. is it possible to add dummy pulse with an EPI sequence?
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There is no limitation for the length of the RF pulse.
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Hi Fang, is it possible to have a pulse that is 3 seconds long? Neha
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I having an error: Error Dialog ERROR!!! Plotting sequence waveform aborted. Undefined function or variable 'rfCoils'. I was trying to plot the sequence of a simple GREspiral sequence. Do you know why this error comes from? The error that shows on matlab is as follows: Reference to non-existent field 'rf_axes'. Error in SeqDesignPanel>SeqDesignPanel_OpeningFcn (line 126) Xlim=get(handles.rf_axes,'XLim'); Error in gui_mainfcn (line 220) feval(gui_State.gui_OpeningFcn, gui_hFigure, [], guidata(gui_hFigure),...
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I having an error: Error Dialog ERROR!!! Plotting sequence waveform aborted. Undefined function or variable 'rfCoils'. I was trying to plot the sequence of a simple GREspiral sequence. Do you know why this error comes from?
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Nancy Li modified a comment on discussion General Discussion
Hi Leo, I want to get the Mx,My,Mz vaule after every TR. I have try to use DoExtPlugin.m, but I found that the value of VObj.Mx,My and Mz were same as initial after every DoScanAtGPU. If the transient value of Mx, My, Mz only appeared in DoScanAtGPU? if it is true. how can I get them.
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Hi Leo, I want get the Mx,My,Mz vaule after every TR. I have try to use DoExtPlugin.m, but I found that the value of VObj.Mx,My and Mz were same as initionliation after every DoScanAtGPU. If the transient value of Mx, My, Mz after every TR only appeared in DoScanAtGPU? if it is true. how can I get them.
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Hi Liu, I have a question on the CEST flag. How are you able to manipulate the CEST...
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m-khojastehnia modified a comment on discussion General Discussion
Thank you for your reply. I just do not understand that when an image reconstructed,...
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I have another question and I do not know is it true to ask here or not. I need the...
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I have another question and I do not know is it true to ask here or not. I need the...
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I have another question and I do not know is it true to ask here or not. I need the...
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Thank you for your help. I understand the answer.
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g_Sig.size is the size of mr sequence segment. The mr sequence is broken into segments...
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d_Sig is the GPU device address for storing mr sequence segment. g_Sig is mr sequence...
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at least I would really appreciate if you tell me what g_Sig.size represents?
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Thanks a lot for your help. I would like to know if d_Sig=g_Sig=dt? (dt is the difference...
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They refer to the size of simulated spin matrix
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SpinMxCol SpinMxRow SpinMxSlice what are those variables?
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Question about how the spin simulation works for one slice: Is the TR reinitialized...
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For the standard GRE sequence, there is no spoiler at end of each TR although you...
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For the standard GRE sequence, does the simulation handle spoilers? I'm asking that...
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How do you incorporate NEX (the number of excitation) in the scan simulation process?...
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I have tried to add the 'rfAmp' line in the DoPulseGen.m file after eval command....
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thanks for the reply. How to do to generate different RF pulses for each TR? So what...
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You can check the function Scan_pushbutton_Callback() in SimuPanel.m. The is the...
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I sent you an email. yesterday. I really want to know what is the exact flowchart...
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I sent you an email. yesterday. I really want to know what is the exact flowchart...
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Currently there is no explicit simulation with concomitant fields.
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hi Fang, I would like to know if the simulation calculations take into account concomitant...
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hi Fang, I would like to know if the simulation calculations take into account concomitant...
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Thanks I was able to make my changes.
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Thanks I was able to make my changes. Another question : do you the file name that...
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The object is always placed in a world space whose size and resolution are determined...
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Gytrapezoid requires valid macro properties. The GzAmp is the amplitude of the gradient...
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I have question about creating a digital phantom in VOBj Structure. I am really confused!!...
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So, is there a way to add a Gycartesian gradient which takes into account the ramp...
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Thanks a lot Fang. I was able to run MRiLab. However, whenever I am trying to either...
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Thanks a lot Fang. I was able to run MRiLab. However, whenever I am trying to either...
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Thanks a lot Fang. I was able to run MRiLab. However, whenever I am trying to either...
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Thanks a lot Fang. I was able to run MRiLab. However, whenever I am trying to either...
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You might want to try LD_LIBRARY_PATH=$LD_LIBRARY_PATH:/opt/intel/ipp/lib/intel6...
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So I added the path in the .bashrc file as : LD_LIBRARY_PATH=opt/intel/ipp/lib/intel64/libippse9.so:$LD_LIBRARY_PATH...
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You don't nessarily need VTK to run MRiLab. VTK is a function for plotting K-space...
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I would like to know what are the modules that I need to turn on for VTK in order...
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You might need to add the library libippse9.so path into your system LD_LIBRARY_PATH...
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I was able to build MRiLab (cmake and make and make install). However when I run...
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I am still having some issues with VTK. I'm trying to install correctly VTK. What...
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MRiLab released /MRiLab/MRiLab 1.3/MRiLab1.3.tar.gz
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Please download the latest version1.3 and try recompile.
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lfibrain@lfibrainlinux:~/MRiLab/Lib/src/build$ cmake .. -- MATLAB_ROOT: /usr/local/MATLAB/R2016a...
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lfibrain@lfibrainlinux:~/MRiLab/Lib/src/build$ cmake .. -- MATLAB_ROOT: /usr/local/MATLAB/R2016a...
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To obtain the k-space trajectory and data, please go to corresponding output folder,...
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I need raw k-space. because I think there is a mapping from raw k-space to cartesian...
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I need raw k-space. because I think there is a mapping from raw k-space to cartesian...
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Hi Li, You need to create VS project using CMake. It looks to me that you are not...
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Li Gang posted a comment on discussion General Discussion
I dont't configure the cmake. It displays the following error messages. Can you help...
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Ranjith modified a comment on discussion General Discussion
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In MRiLab 1.2 source, in which source files the full definitions of structure variables...
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In MRiLab 1.2 source, in which source files the full definitions of structure variables...
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In MRiLab 1.2 source, in which source files the full definitions of structure variables...
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Simply run the MRiLab.m in the Matlab command window. It will pop up UI for you....
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Catherine Fallon modified a comment on discussion General Discussion
I feel so silly, but I downloaded your file MRiLab1.2 just now and have no idea how...
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I feel so silly, but I downloaded your file just now and have no idea how to run...
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Sen Jia modified a comment on discussion General Discussion
Recently I successfully installed MRiLab with Intel IPP 8.2 in Intel Parallel Studio...
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Recently I successfully installed MRiLab with Intel IPP 8.2 with the help of Fang...
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annesophie2512 posted a comment on discussion General Discussion
There is no OsiriX forum here.
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Sorry I probably can not help with this topic. It might be a good idea to post this...
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When I launch my plugin, I receive : "Plugins Error : OsiriX cannot launch the selected...
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MRiLab v1.2 is released
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