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rhody
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Cyberknife VSI:
Life saving technology, bests the Gamma knife, one friend was treated successfully for prostate cancer and another about to be with a benign tumor behind the 8th cranial nerve (above and behind his left ear). He is waiting for consultation at the moment.
The Technology:
Figure 3 shows the Iris Variable Aperture Collimator projecting a conical beam, that converges to a precise point. The Iris Collimator contains 12 triangular collimator segments, oriented to define a dodecagon-shaped beam aperture. The 12 segments are divided into 2 banks of 6 segments that are mounted in series, with the 2 banks rotated by 30 degrees relative to each other. See dodecagon google image capture below, here is the dodecagon wiki:
http://img841.imageshack.us/img841/1674/tridodecagon.jpg
My friend with the 8th cranial benign tumor and has found who he believes is the most experienced Doctor and research scientist in the field, Dr Chang, who studied under Dr Adler (who helped the development and testing of the CyberKnife) and treated the patient, Tony Boxer successfully in the http://www.cs.umb.edu/~dqg/newone/tony_b.htm link here with few side effects and no more hearing loss. This all happened in 2001. He is waiting for a consultation, and Dr Chang's team responded within four hours of his sending diagnosis information for a consultation.
I am happy to report my other friend was treated successfully for prostate cancer with Cyberknife two years ago. Knock on wood, so far so good. I wish him the best with his treatment of the benign tumor behind his left ear. Is the 8th cranial nerve inside the pia mater,it is hard to tell, see the Meninges figure here, wiki.
Rhody...
Life saving technology, bests the Gamma knife, one friend was treated successfully for prostate cancer and another about to be with a benign tumor behind the 8th cranial nerve (above and behind his left ear). He is waiting for consultation at the moment.
The Technology:
See the Figure 2 below this section. How are the beams controlled such that a focal point is chosen that nothing is affect behind it ? Think poke a hot steel needle into the tumor and then stop, can be done with a solid object, but a beam traveling at the speed of light, not so easy. A detailed explanation of collimator focusing, and an analogy or visual description would be appreciated. Details of the Collimator and the beams below:The CyberKnife® Robotic Radiosurgery System (Accuray Incorporated, Sunnyvale, CA, USA) has undergone almost twenty years of technical development from its conception (1) to its most recent version, the CyberKnife VSITM System, the first of which was installed in April 2010. The CyberKnife System, as described in a series of technical papers in the late 1990s (2-7), began as a frameless alternative to existing stereotactic radiosurgery systems such as the Gamma Knife (Elekta AB, Stockholm, Sweden) and conventional linear accelerators (LINACs) equipped with head frames and stereotactic beam collimators. In the original CyberKnife configuration, a LINAC mounted on a robotic manipulator delivered many independently targeted (non-isocentric) and non-coplanar treatment beams with high precision under continual X-ray image guidance
and...
Treatment planning begins with obtaining one or more three-dimensional (3D) images that allows the target volume and nearby organs at risk (OARs) to be visualized. Once acquired the 3D images are transferred to the MultiPlan® Treatment Planning System (TPS) via a dedicated database server.
and...
The number of nodes in the different path sets ranges from 23 to 133.
Direction points are determined automatically based on the beam generation mode, which is either isocentric or non-isocentric. The isocentric mode allows the user to position one or more pseudo-isocenters within the patient model resulting in one candidate beam from each node to each pseudo-isocenter. The non-isocentric mode takes advantage of the ability of the robotic manipulator to direct each beam at a unique point within the patient, without any need to reposition the patient between beams, by generating a large number of direction points (typically 1,000–6,000) semi-randomly within the target volume and distributes these uniformly among the nodes to form the candidate beam set. The user can choose to prevent candidate beams from passing through OARs, which can be a method to minimize the dose delivered to small radiosensitive structures such as the lens of the eye or the thyroid gland.
and...
The user then selects between one and three fixed collimator sizes, or between one and twelve Iris Collimator field sizes, which are assigned to subsets of the candidate beam set.
Figure 3 shows the Iris Variable Aperture Collimator projecting a conical beam, that converges to a precise point. The Iris Collimator contains 12 triangular collimator segments, oriented to define a dodecagon-shaped beam aperture. The 12 segments are divided into 2 banks of 6 segments that are mounted in series, with the 2 banks rotated by 30 degrees relative to each other. See dodecagon google image capture below, here is the dodecagon wiki:
http://img841.imageshack.us/img841/1674/tridodecagon.jpg
My friend with the 8th cranial benign tumor and has found who he believes is the most experienced Doctor and research scientist in the field, Dr Chang, who studied under Dr Adler (who helped the development and testing of the CyberKnife) and treated the patient, Tony Boxer successfully in the http://www.cs.umb.edu/~dqg/newone/tony_b.htm link here with few side effects and no more hearing loss. This all happened in 2001. He is waiting for a consultation, and Dr Chang's team responded within four hours of his sending diagnosis information for a consultation.
I am happy to report my other friend was treated successfully for prostate cancer with Cyberknife two years ago. Knock on wood, so far so good. I wish him the best with his treatment of the benign tumor behind his left ear. Is the 8th cranial nerve inside the pia mater,it is hard to tell, see the Meninges figure here, wiki.
Rhody...
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