How far is the automated 3-D segmentation of Brain MRI efficient compared to manual segmentation?

3d x ray scanner image

Sandhya

We are doing a project on automated 3-D segmentation of brain MRI using MATLAB. We would like to know the extent to which "Surf" commands are efficient in producing reliable segmented 3-D image. The accuracy level, how much it is better compared to manual segmentation. We need statistical detail, kindly help us....

Answer
This correspondence deals with the development of an
automated 3-D segmentation of Brain MRI. The proposal is a
model-based approach for accurate, robust, and automated
tissue segmentation of brain MRI data of single as well as
multiple magnetic resonance sequences. The main contribution
of this study is that we employ an edge-based geodesic active
contour for the segmentation task by integrating both image
edge geometry and voxel statistical homogeneity into a novel
hybrid geometricâstatistical feature to regularize contour
convergence and extract complex anatomical structures. We
validate the accuracy of the segmentation results on simulated
brain MRI scans of both single T1-weighted and multiple T1/
T2/PD-weighted sequences. When compared to a current stateof-
the-art region based level-set segmentation formulation,
our white matter and gray matter segmentation resulted in
significantly higher accuracy levels with a mean improvement
in Dice similarity indexes. Thus the development of the project
is done using MATLAB simulation for results.
A Hybrid Automated 3D Segmentation in Brain MRI -------------------------------------------------------- Advantages of a MRI scan
⢠MRI scanners are good at looking at the non-bony parts
or "soft tissues" of the body. In particular, the brain, spinal
cord and nerves are seen much more clearly with MRI
than with regular x-rays and CAT scans.
⢠Also, muscles, ligaments and tendons are seen quite well
so that MRI scans are commonly used to look at knees
and shoulders following injuries.
⢠A MRI scanner uses no x-rays or other radiation.
⢠A disadvantage of MRI is itâs higher cost compared to a
regular x-ray or CAT scan. Also, CAT scans are frequently
better at looking at the bones that MRI.

Please name companies that makes Cone Beam CT Scanning Equipment?

Mr. USA

I am looking for a CBCT equipment that would allow me to create 3D images from the scans. I need an integrated CBCT and 3D facility. I also need a handheld CT scanner. Prices? List of manufacturers, too. Thank you, kindly.

Answer
You can view and dowload a presentation of CBCT manufacturers at Scribd. A web link to each vendor's website is included.
http://www.scribd.com/doc/14048324/Cone-Beam-CBCT-Scanners-April-2009

A growing directory of customers for CBCT scanners is located here:
http://knol.google.com/k/murry-shohat/cbct-x-ray-services-directory/2srzofgvr8kjr/12#

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