X-ray or gamma ray systems or devices – Specific application – Absorption
Patent
1995-02-03
1996-06-18
Church, Craig E.
X-ray or gamma ray systems or devices
Specific application
Absorption
378119, 378147, 378149, A61N 510
Patent
active
055286534
DESCRIPTION:
BRIEF SUMMARY
TECHNICAL FIELD
The present invention relates to a radiating unit of Gamma cutter system, and more particularly, to a rotable Gamma-ray radiating unit.
BACKGROUND OF THE INVENTION
The existing Gamma-ray radiating unit, as a key component of a medical device used in nuclear actinotherapy-Gamma cutter system, in regard to its configuration, includes a source body consisting of a number of radiation sources, and the source body is mounted in an antiradiation protection shielding case with its beam channels being directed radically toward a common focal point, such as what is described in European Patent Publication EP-248774. Since the Gamma cutter employs multiple radiation sources each with only a small dosage of radiation, it provides the maximum radiation energy only at the common focal-point, so that the tissue with pathological changes at the focal point will be effectively killed without any harm to its surrounding healthy tissues in certain period of time. Based on this consideration, the existing Gamma-ray radiation unit uses as many radiation sauces as possible, for example, in Leksell Gamma Cutter produced by Swedish ELEKTA Company, there are 201 radiation sources arranged regularly on a hemisphere. With quite a number of radiation sources and the correspondingly increased use of heavy metallic shielding materials, both the weight and the volume of such Gamma cutter will be enormous. In terms of manufacturing, to orderly and accurately make hundreds of holes having a common focal point on a hemisphere with quite a large diameter calls for rigorous technical measures and technological equipment. And since the source body is fixed in the shielding case, and its Gamma rays, even with smaller radiation energy, statically focus on the tissue of pathological changes, still needing to continuously get through healthy tissues to reach the focus of infection, harms will inevitably be caused to healthy tissues due to the progressive accumulation of radiation time.
DISCLOSURE OF THE INVENTION
The object of the present invention is to provide a rotational coniformly-focused Gamma-ray radiation unit with a simple configuration and less radiation sources, so as to ensure effective beam radiations and reduce harms to healthy tissues.
The task of the present invention is accomplished in the following way: the source body of the rotational coniformly-focused Gamma-ray radiating unit is a geometrical solid of revolution symmetrical to the central axis of the radiating unit, several radiation sources and beam channels are set up in the source body to radially aim at a common focal point inside the shielding case and around the common focal point there is at least a space enough for a human brain. The antiradiation protection shielding case is provided with a rotable mandrel which is on the central axis of the radiating unit with one end fixed to a mandrel base of the source body and the other end linked with a drive device. Because the source body is fixed to the rotable mandrel, under power-driving, the source body can rotate by 360.degree. within the antiradiation protection shielding case. In the operating state, the scanning traces of the beams of radiation sources of the source body thus form several conical surfaces or pyramids with the common focal point as a common apex. When all beam channels are not symmetrical to the mandrel, the scanning trace of each beam of the source body will form an independent revolutionary conical surface; if these revolutionary conical surfaces are sectioned by some planes perpendicular to the axis of rotation, the traces on the planes would be some concentric circles with different radii and the common focal point as a center. It can be seen thereby that, no matter the source body remains stationary or dynamically rotative, the beam radiation which the common focal point accepts is continuously constant. However, a beam-scanned point out of the common focal point only accepts a single instant irradiation intermittently during a revolution of the source body, and its irradi
REFERENCES:
patent: 4233519 (1980-11-01), Coad
patent: 4780898 (1988-10-01), Sundqvist
patent: 5267294 (1993-11-01), Kuroda et al.
"Stereotactic Radiosurgery", Forster and Dias, Surgery, No. 97, Oct. 1, 1991, pp. 2323-2325.
Du Yi
Song Shipeng
Su Yixiang
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