NITRC QModeling Forum: help

RE: Parametric Images

lllllll — Fri, 12 Jul 2019 10:17:13 GMT

Thank you very much for your help, that works.
Regards,

Laurent

RE: Parametric Images

José Paredes-Pacheco — Fri, 12 Jul 2019 9:59:01 GMT

Hello Laurent,

Thank you for using our toolbox. We hope you find it useful.
Regarding your problem. In the modal window of the Step 2, after click on Preprocess model button and generate the fitted curve, the modal window is minimized to see the results. So, you have to maximize it and click on "OK" button of the modal window (attached file) to accept the preprocessing results before continue to Step 3 Pixel-wise Calculation.

If you have any more problems, please let us know.

Regards,

Jose

Parametric Images

lllllll — Fri, 12 Jul 2019 8:37:46 GMT

Hello,

First, thank you for your toolbox, it is very nice.
I have a problem when I want to access to the pixel-wise Calculation and to the parametric images.
I Loaded my dynamic image in NIFTI format, then I loaded my mask in NIFTI format (for example my reference region is cerebellum, my ROI is Putamen), then the software asked me to load a .txt files for the mask, so I loaded it. I can then prepare the TACs and process the model (SRTM 2 for example). I obtained my Fit curves and my parameters. But I don't have access to step 3 for the wise Calculation. Is there anything I missed?
Thank you for your response.

Laurent

RE: wrong searchpath for wfu_pickatlas

dbl — Thu, 24 May 2018 13:28:17 GMT

Thanks Francisco for v1.9. wfu_pickatlas can now be called from QModeling.

Kind regards,
Dominik

RE: wrong searchpath for wfu_pickatlas

Francisco J. López-González — Thu, 24 May 2018 10:35:24 GMT

Hello!

Thank you for using QModeling. We are happy you like it and we hope you find it useful.

To the question, have you copied the wfu_packatlas folder to the toolbox folder of SPM? When you press the "Create masks with wfu_pickatlas", the corresponding function looks for the wfu_pickatlas toolbox at the same folder in which QModeling is, that is, whereverSPMis/toolbox. It seems that the function did not find the wfu_pickatlas folder at this location and it has tried to access a wrong path (This is a bug; we have fixed it and uploaded a new version to our web).

Please, let us know if this works.

Kind regards,
Francisco J.

wrong searchpath for wfu_pickatlas

dbl — Thu, 24 May 2018 5:58:59 GMT

Hello, Qmodeling toolbox looks nice!
I have a question regarding wfu_pickatlas. I downloaded the wfu_pickatlas files and copied them to the SPM folder. It can succesfully open wfu_pickatlas using matlab by typing [i]>>wfu_pickaktlas[/i]. But when I try to "Create masks with wfu_pickatlas" using Qmodeling, I get an error that wfu_pickatlas.m is not found. The corresponding error message in Matlab says.
[i]Error using run (line 41)[/i]
[i]\home\usuario3\Matlab\spm12\toolbox\wfu_pickatlas\wfu_pickatlas.m not found.[/i]
The error is not surprising because [i]"\home\usuario3\..." [/i]is not my directory for smp12. Can I change the searchpath of Qmodeling for wfu_pickatlas?

Thanks in advance
dbl

RE: question regarding time activity curves

Francisco J. López-González — Tue, 03 Apr 2018 11:40:17 GMT

Hello Greg,

First of all, thank you for using our toolbox.

To the first question, QModeling does not change the original units of the images. It just reads the voxel values from the loaded study and obtains the average value from the specified regions for each frame to make the TACs. Consequently, "original units" by time (in minutes) are shown. Usually the images exported from the PET scanner are in kBq/ml or similar activity concentration units, so you could check the initial values in your DICOM and make sure they have not been modified in the DICOM to nifti conversion.

Regarding to the other question, the data you mention are typically used to obtain the SUV. However, they are not used for kinetic modelling. Would you want to use them for any particular purpose?

Kind regards,
Francisco J.

question regarding time activity curves

gregof — Tue, 03 Apr 2018 8:27:21 GMT

hello
i was woundering in which units does qmodeling produces the TACs. followup question: nifti headers do not contain subject data such as wight hight or the radioisotpe dose - is it posible/correct to take this data into acount? If so how
thanks
Greg

RE: Otto: problem reading files in QModeling

Francisco J. López-González — Mon, 11 Sep 2017 9:12:49 GMT

Dear Otto,

I am sorry, the error message is unclear. We will need more information to find where the problem is.

Is there any other warning/error message at the logfile? Is your dynamic PET study a multiframe file? How many frames the PET study has? if you could share more details about your PET study, we would appreciate it.

Could you upload some data for checking?

Kind regards,
Francisco J.

Otto: problem reading files in QModeling

Otto Muzik — Sat, 09 Sep 2017 15:26:14 GMT

Hi,

I am trying use the QModeling software, but when I select my dynamic PET study and
the mask file (all in *.nii format) and click on "Prepare Tac's", the program gives an
error message:

"An unexpected error occured reading PET"

Any idea what might be the problem?

Many thanks

Otto

Otto Muzik, PhD
Wayne State University
PET Center
3901 Beaubien Blvd
Detroit, MI, 48201
USA