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SurgyTec: Surgical Video Community October 31, 2008

Posted by tomography in Medicine 2.0, Surgery.
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I think it is no shame to admit, that I become a little bit lightheaded when it comes to being in the operating room seeing all that blood and most of the procedures. But being in the O.R. is still one of the best places to learn about medicine. One may pick up a little bit of anatomy, physiology, and anesthesiology at the same time. But the best part of it all is that which you see in the O.R. will become a lifetime experience and a memory one never forgets. Therefor studying becomes much easier.

SurgyTec is a great place for students and even professionals to learn about new surgical techniques via great quality videos.

SurgyTec is the first global online surgical community where surgeons and invasive specialists can exchange know-how through freely accessible video and slide shows. It facilitates the barrier-free sharing of know-how and skills to the surgical community, across all surgical and invasive disciplines. The gain by sharing philosophy, which SurgyTec.com is built around, has since the launch of its test site in January already attracted surgeons from all continents exchanging ideas, opinions and experiences.

Check it out!

– Andras


MRI helps surgical planing November 18, 2007

Posted by tomography in development, MRI, Surgery.
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The preoperative magnetic resonance imaging (MRI) image is no longer accurate enough for brain surgery.


Everything changes after the surgeons open your skull. Your brain, and the tumor inside it, no longer fully float in their protective bath of cerebrospinal fluid. Gravity comes into play, as does the atmospheric pressure of the operating theater. The brain responds to these foreign forces, the cerebral tissue sagging, rebounding and changing shape. The tumor that the neurosurgeons want to remove also has changed position.

Thus, the brain the surgeon operates on is a different shape from the one depicted in the preoperative MRI. Of course, once the surgeon begins work, the shape of the brain changes even more. The brain’s changing shape is a problem not only of space, but of time.

In essence, the William and Mary team provides the surgical team with a dynamic computer model of the patient’s brain. In clinical trials, Chrisochoides (mathematician professor at the College of William and Mary) says his team can render a new model in six or seven minutes, but hopes to be able to do so in under two minutes.

We want to help the neurosurgeon make an informed decision of what to cut, where the critical paths are, what areas to avoid, he said. I’m neither a neurosurgeon nor a doctor, so the contribution of my research is to make this distillation of objects really, really, really fast.

The process begins with the acquisition of a variety of images before the surgery – images which are otherwise unavailable in the middle of the procedure. Low-resolution intraoperative data allows the tracking of the shift of brain matter and calculates how to change the preoperative images accordingly.

The brain, of course, is an elastic object.

If you push it, -Chrisochoides said-, it takes energy and then after a while it settles down. We can calculate the place where it settles by solving the partial differential equation. Mathematicians can tell us that there is a solution, but they cannot tell us what the solution is. There’s no such thing for this equation. There’s no analytic solution. So we have to approximate.

Chrisochoides approximates the geometry of the patient’s brain by tessellating it into triangles in three dimensions, or in other words, generating a mesh representing the brain. Users wear 3D glasses to examine projected images of a brain. The glasses give the audience a striking 3D effect, showing off the curves of the vector arrows indicating how displacement was acting on the brain.

Source: NSF

Grab it like Tom! :-) November 12, 2007

Posted by tomography in development, Innovation, Surgery, What tomorrow brings?.
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The use of 3D imaging in the medical field has proven to be a boon to doctors when diagnosing patients, and 3D models of the human body have assisted medical manufacturers in developing better medical devices and treatments. Now researchers at the Fraunhofer Institute for Telecommunications, Heinrich-Hertz-Institut (HHI) in Berlin have developed a display that combines a 3-D screen with a non-contact user interface that allows images to be rotated by hand gestures much like the display Tom Cruise played with in the film Minority Report.3dskullscreen

The display was developed for medical use where traditional ways of interacting with displays through touch runs the risk of compromising the sterility of work environments. With the newly developed non-contact image control system a physician can rotate a three-dimensional CAT scan image that appears to float before their eyes with a gesture of their fingers, while with another gesture they can click onto the next image.

The system works by utilizing images from three cameras, two of which are installed above the display and a third which is integrated into the frame of the display. The two cameras above the display see the pointing finger from different angles, allowing image-processing software to identify the exact position of the finger in a three-dimensional space. The third camera scans the user’s face and eyes to identify the inclination of the user’s head and the direction in which the eyes are focused and the associated software generates the appropriate pair of stereoscopic images for each eye. The cameras record one hundred frames per minute so, even if the user moves their head, the system instantly adapts the images!!! In this way, the user always sees a high-quality three-dimensional image on the display, even while moving about. This is essential in an operating theater, and allows the physician to act naturally when carrying out routine tasks.

Source: MedGadget