Calculating SAR by using FDTD
Anyone has information about calculating Specific Absorption Rate (SAR) by using Finite-Difference Time-Domain for a specific part of the body (for example head)?
I have some papers about this topic, but want to know how should i start? This is what i understood from the papers:
First i should have a human body model and then tissue properties like conductivity must be assigned to that model, and then the SAR can be calculated by FDTD.
But i wanna know
1-how this human body model should be? is it a image? some 3D pictures are in the papers, are 3D pictures required?
2-How the tissue properties are assigned to this model? by a image processing program (like what)?
3-Finally how the FDTD of a image with some properties can be calculated (which program)?
Thanks
i think first u take simple planner/circular or spherical tissue models after then u can go for further modelling using FDTD.
For SAR calculation u first calculate the electric field distribution within the planner/circular or spherical tissue models then u can calculte SAR using very simple formula which is avialble in many papers.
Tissue model can be defined by material properties like dielectric constant and conductivity of th etissue at perticular frequency so u can easily define tissue properties in FDTD and then define simple structure.
well after a lil bit search i came to these conclusions:
1-Im sure that i want to use FDTD for SAR, so first i should choose a EM Simulator which is good at calculating FDTD. It seems that Remcom XFDTD, Semcad and CST are among the famous simulators.
2-For my work i need a detailed model of the human body. It seems that the VOXEL data are the best model that are obtained from images of different parts of the body. In most of the papers related to my work, they say that they have used the images from the Visible Human Project in National Library of Medicine to model the human body (http://www.nlm.nih.gov/research/visi...ble_human.html).
3-I think all the above simulators have the option for importing VOXEL data like the Zubal Phantom from Yale university which is available free at (http://noodle.med.yale.edu/zubal/info.htm), offcourse i dont know why the format of these files are .dat?
4-It seems all of these EM Simulators have a human body model which is sometimes called Meshes or Phantoms:
CST (HUGO human model)
http://www.cst.com/Content/Applicati...man+Body+Model
Remcom XFDTD (Meshes): http://www.remcom.com/xf7-biological-meshes/
Semcad (Phantoms)
http://www.semcad.com/simulation/app...tom_models.php
So i want to know whats the difference between these types of models, i mean VOXEL or Meshes or...? and which one is the most detailed one?
I know that tissue properties can be assigned to these models and i have a good source for these kind of information, but first different tissue types must be available to do so.
Also which program u suggest for this work?
hii
i am using CST for SAR calculation. This is very efficient tool for SAR analysis but u require highly hardware requirement to analyze the SAR analysis.
u can use the phantom model available free of cost but HUGO model developed by CST is not free available.
i think now ur problem has been solved.
Hi Ravi8331
Well which phantom model u mean? the one i said from Yale University? http://noodle.med.yale.edu/zubal/info.htm. I downloaded it, but its a .dat file and they recommend SCION Image to open the files, im trying to do that, but dont know if an image program can extract .VOX files for me?
We have CST STUDIO SUITE 2008 in our university, but it only has a folder named HUGO Human Dataset Update, there i found a Human Model.VOX file, but when i import it, it keep saying that model.lat (or sth like this) is missing and cant open the model.
Can u tell me that the HUGO model is with CST when u installed it? i mean if i get the newer versions, is it possible that they contain HUGO? or i should get it seperately?
Thanks
yaa i kn that this file is nit open in the CST bcoz this is image data means for medical image processing n telemedicine purpose (according me).
HUGO model u purchased from CST then u can used it.
Dear,
if you have managed to solve your simulation model can you please share it with me.
Regards