MGH head 1:MGH head 1: Difference between revisions

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== MGH head 1 ==
[[File:giorgio_phant.jpg|200px|thumb|right|]]
[[File:giorgio_phant.jpg|200px|thumb|right|]]
This is a head phantom based on a 1mm isotropic resolution MR dataset which was anatomically segmented and used as a numerical model for electromagnetics calculations as described in:
=== Citation ===
Makris et al.
Nadine N. Graedel, Jonathan R. Polimeni, Bastien Guerin, Borjan Gagoski and Lawrence L. Wald (2015). "An anatomically realistic temperature phantom for radiofrequency heating measurements". Magnetic Resonance in Medicine 73(1):442–450
 
[http://www.ncbi.nlm.nih.gov/pubmed/18985401 MRI-based anatomical model of the human head for specific absorption rate mapping.


We have taken this anatomically labeled head from a pixel model to a mesh model and created a phantom with 2 fluid compartments; 1) brain, and 2) other soft tissues (see figure below). The idea is that materials that are electrically similar are grouped together. Thus bone and air (both low epsilon, low conductivity) are done in plastic (also low e, low conductivity), and the tissue compartments can be filled with appropriate fluids. Also shown on the figure below is a CT scan of the phantom and an MRI of the filled phantom.
=== Download files ===
Click [https://phantoms.martinos.org/images/3/36/MGH_head_1.zip here] to download the CAD model.


[https://gate.nmr.mgh.harvard.edu/wiki/Phantoms/images/MGH_head_1.zip Click here for .skp and stl files] to download files for the anthropomorthic head phantom published in Graedel et al MRM 2014.
=== Phantom description ===
This phantom is based on a 1mm isotropic segmented head model which was labeled as described in [http://www.ncbi.nlm.nih.gov/pubmed/18985401 Makris et al].


'''3D printing tips'''
The segmented head data was converted into a simplified surface model with two compartments: Brain and other soft tissues. Bone and air (both low epsilon, low conductivity) are printed together out of plastic material with similar electrical properties.


be sure to see our info on the first page concerning sealing phantoms created by addive technology 3D printers.  Normally these are porous and do not hold water; they need a sealing step.
=== Special considerations ===
The sealing flange uses an o-ring.


[[File:Phantom_figure_CT_MR.png|400px|thumb|right|]]
[[File:Phantom_figure_CT_MR.png|400px|thumb|right|]]

Latest revision as of 13:44, 24 March 2015

Giorgio phant.jpg

Citation

Nadine N. Graedel, Jonathan R. Polimeni, Bastien Guerin, Borjan Gagoski and Lawrence L. Wald (2015). "An anatomically realistic temperature phantom for radiofrequency heating measurements". Magnetic Resonance in Medicine 73(1):442–450

Download files

Click here to download the CAD model.

Phantom description

This phantom is based on a 1mm isotropic segmented head model which was labeled as described in Makris et al.

The segmented head data was converted into a simplified surface model with two compartments: Brain and other soft tissues. Bone and air (both low epsilon, low conductivity) are printed together out of plastic material with similar electrical properties.

Special considerations

The sealing flange uses an o-ring.

Phantom figure CT MR.png
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