"Gamma Knife" is called "knife", but in fact it is not a real scalpel, it is a hemispherical helmet covered with a straight aligner, the helmet can shoot 201 cobalt 60 high-dose ionized rays - gamma rays. It is precisely localized in a certain area, which we call the "target point", by modern imaging techniques such as CT and magnetic **** vibration. Its positioning is extremely accurate, the error is often less than 0.5 millimeters; each gamma ray dose gradient is so large that there is almost no damage to the tissue. However, 201 rays gathered together from different locations can lethally* destroy the target tissue. It is named for its function as if it were a scalpel, and has the advantages of being non-invasive, requiring no general anesthesia, no incision, no bleeding and no infection.
Gamma Knife is divided into Head Gamma Knife and Body Gamma Knife. The head gamma knife is a cobalt source mounted in a spherical helmet, which is focused on a point inside the skull to form a narrow beam of gamma rays with sharp edges. The narrow beams are converged on the lesion to form a confined high-dose zone to destroy the lesion during treatment, and are mainly used for the treatment of small intracranial tumors and functional diseases. Body Gamma Knife is mainly used to treat various tumors in the whole body.
Gamma ray stereotactic radiotherapy system is a kind of stereotactic radiosurgery equipment which integrates stereotactic technology and radiosurgery technology to treat cranial and cerebral diseases. It adopts the gamma ray geometric focusing method, through the precise stereotactic, will be planned after a certain dose of gamma rays focused on the body of the pre-selected target point, a one-time, lethal destruction of the point of the tissue, in order to achieve the effect of surgical resection or destruction. Normal tissues around the lesion are outside the focal point, and are only irradiated by a single beam of gamma rays, which is very low in energy and free from damage. It is like focusing the sunlight with a magnifying glass, the heat of the focused spot can ignite the object, while the sunlight outside the focus is safe. Gamma rays instead of scalpels, its therapeutic irradiation range and normal tissue demarcation is very obvious, the edge of the knife like cut, people figuratively called "gamma knife".
The gamma knife is not really a scalpel, but a very advanced radiation therapy equipment, its full name is: gamma ray stereotactic treatment system. It shines many beams of very fine gamma rays through the body from different angles and directions, and causes them all to converge at one point to form a focal point. There is a head gamma knife and a body gamma knife.
When receiving Gamma Knife treatment, the first step is to diagnose and localize the lesion with a stereotactic system, which is a specially designed coordinate system. After the patient is relatively fixed in the stereotactic system, tomography scans of the lesion through CT/MRI can show the relative positions of the lesion and the reference points of the coordinate system. After diagnosis and positioning, the treatment planning system automatically processes the CT/MRI scanning pictures, computer reconstructs the three-dimensional morphology of the body surface, the lesion and its surrounding sensitive tissues, and carries out the treatment planning based on the prescription dose prescribed by the doctor, calculating the number of target points required for treatment, the coordinates of the target points, the collimator number and irradiation time to be used for each target point, and so on. After receiving the relevant data from the treatment planning system, the electrical control system controls the treatment bed to send each target point to the focal point in sequence and turn on the corresponding collimator for quantitative irradiation to achieve the purpose of tumor treatment. The Armed Police Hospital has introduced the world's most leading modern large-scale high-tech medical equipment - head gamma knife, body gamma knife, linear gas pedal (X-knife), and other international cutting-edge oncology quality equipment, to establish a tumor treatment center.