摘要:
A contour collimator for radiation therapy has a plurality of diaphragm elements that are movable with respect to each other by means of drive units. The diaphragm elements of the invention are supported only on the side near the drive units for ease of movement. This allows larger contour collimators to be constructed having relatively heavy diaphragm elements while retaining relatively small motors.
摘要:
The invention relates to a collimator (1) for limiting a bundle of high-energy rays (2), which is emitted by a substantially point-like radiation source (3) and directed towards a treatment object (20) and used in particular for the stereotactic conformation radiotherapy of tumors. According to the invention the collimator (1) comprises a plurality of diaphragm leaves (4, 4′) which are arranged opposite each other and which are made of a radiation-absorbing material and which, by means of drive mechanisms, can be moved into the optical path in such a way that the contours and/or exposure period of said optical path can be freely defined, the front edges (5, 5′) of the diaphragm leaves (4, 4′) being parallel to the optical path at all times. Avoiding penumbral shadows with this kind of collimator (1) is made considerably easier if the diaphragm leaves (4, 4′) consists of a rear partial element (6, 6′) which can be linearly displaced and a front partial element (7, 7′) which is hinged to same. Drive means adjust the front partial element (7, 7′) in accordance with the prevailing position of the rear partial element (6, 6′) in such a way that the front edges (5, 5′) are parallel to the optical path at all times.
摘要:
The invention relates to a displacement-detecting element (1) comprising a measuring resistance (2), voltage source (3) and a displacement-dependent voltage pick off (4). The measuring resistance (2) is embodied in the form of a strip. The length of the resistor (6) corresponds to at least the maximal length of displacement (7) of the component to be detected. The invention also relates to a multileaf collimator (23) having such a displacement-detecting element (1). The aim of the invention is to produce a displacement-detecting element (a) for detecting the position of the leaves (22) in a multileaf collimator (23) in a precise and faultless manner. The displacement detecting element (1) is designed for detecting the displacement (7′) of the leaves (22) in a multileaf collimator (23) in the following manner: the measuring resistance (2) or the voltage pick off point (4) are connected in a rigid manner to the leaves (22) in order to detect the displacement and another functioning element (4 or 2) is arranged in a fixed manner. At least one of these functioning elements (2, 4) is disposed in an area (33, 33′, 33″) of the leaves (22), which is not exposed to main radiation (34).
摘要:
The radiation system has several radiation sources aimed toward a central point. These radiation sources are on arc element that pivots on an axis. The center can hence be irradiated from different sides. The radiation sources preferably have irregularly adjustable diaphragms. The system is suitable for irradiating any part of the human body. It is easy to manufacture and simple to used.
摘要:
The invention relates to a collimator (1) for defining a beam of energetic rays (2) which is emitted from an essentially punctiform radiation source (3) and is oriented onto an object (1) to be treated. The collimator is especially used for the stereotactic conformation radiotherapy of tumors. The collimator (1) is embodied in such a way that an irregular object (4) can be scanned by rays (2, 2′) which are defined by an opening in the collimator. The invention also relates to a program for controlling the collimator. In order to define the contours (29, 29′, 29″) of the objects (4) to be irradiated in a simple but highly accurate manner, especially with a precise definition of the irradiation fields, the collimator comprises a plurality of different sized openings (5, 5′ 5″). One of the openings (5, 5′, 5″) can be selectively displaced in a polydirectional manner on a strip (6) having a spherical surface, and the central axis (7) thereof is oriented towards the radiation source (3). The other collimator openings (5′, 5″) are shielded form the rays (2). A control system (9) acts on the drives (23, 24, 25) of a drive device (8) in such a way that large openings (5, 5′) are used to scan large irradiation surfaces (26) of the object to be treated (4), and small openings (5′, 5″) are used for precise definition at the edge of the irradiation surfaces (26) of the object to be treated (4), especially in the event of irregular contours (29, 29′, 29″).
摘要:
The invention relates to a collimator (1) for defining a beam of energetic rays (2) which is emitted from an essentially punctiform radiation source (3) and is oriented onto an object (1) to be treated. The collimator is especially used for the stereotactic conformation radiotherapy of tumors. The collimator (1) is embodied in such a way that an irregular object (4) can be scanned by rays (2, 2′) which are defined by an opening in the collimator. The invention also relates to a program for controlling the collimator. In order to define the contours (29, 29′, 29″) of the objects (4) to be irradiated in a simple but highly accurate manner, especially with a precise definition of the irradiation fields, the collimator comprises a plurality of different sized openings (5, 5′ 5″). One of the openings (5, 5′, 5″) can be selectively displaced in a polydirectional manner on a strip (6) having a spherical surface, and the central axis (7) thereof is oriented towards the radiation source (3). The other collimator openings (5′, 5″) are shielded form the rays (2). A control system (9) acts on the drives (23, 24, 25) of a drive device (8) in such a way that large openings (5, 5′) are used to scan large irradiation surfaces (26) of the object to be treated (4), and small openings (5′, 5″) are used for precise definition at the edge of the irradiation surfaces (26) of the object to be treated (4), especially in the event of irregular contours (29, 29′, 29″).
摘要:
The invention relates to a patient positioning and transport system comprising a transportable stretcher (1) and a cart (2) for transporting the stretcher (1) with the patient. The stretcher (1) can be removed from the cart (2) to be placed on a diagnosis or treatment station (4). A patient positioning and transport system of the aforementioned type should be designed as to avoid, to the greatest possible extent, repositionings of the patient between separate diagnosis or treatment stations (4). Towards this end, at least one adapter plate (3) that can be assigned to the stretcher (1) is provided, whereby the stretcher (1), the adapter plate (3) and the cart (2) can be joined to another and are configured in such a manner that the stretcher (1) with the patient can be transferred from the cart (2) to various, differently designed diagnosis or treatment stations (4) and back.
摘要:
A method of intensity-modulating a beam of radiation from a radiation source is provided, the method including the steps of: a) providing a collimator having a window which allows the passage of radiation from the radiation source and which defines when viewed from the radiation source a two-dimensional array of bixels, the collimator further having a plurality of independently movable radiation attenuators which are constrained to move along columns or rows of the array to block selected bixels thereof, whereby, within each column or row along which the attenuators are movable, at least one arrangement of the respective attenuator(s) results in a pair of open bixels sandwiching a blocked bixel or line of blocked bixels; b) positioning the collimator in the path of the radiation source; and c) repeatedly: positioning the radiation attenuators within the window to form at each repeat a different pattern of bixels; and irradiating the collimator, until a predetermined pattern of radiation intensities for the beam of radiation has been delivered through the collimator. A corresponding apparatus for producing an intensity-modulated beam of radiation which is operable in accordance with the above method, and a method of radiotherapy treatment performed on a human or animal body comprising subjecting the body to an intensity-modulated beam of radiation formed using the above method are also provided.
摘要:
The invention relates to a method and device for operating collimator (1) for limiting a beam of high-energy radiation (2) which, starting from an essentially point-shaped radiation source (3), is directed onto an object (4) to be treated and which is used especially for stereotactic, conformal radiation therapy of tumors, wherein the collimator (1) has an iris diaphragm (5) as a beam-limiting means. For such a collimator (1), a high degree of shielding for minimal overall height and with a variable opening size of the diaphragm opening (12) is achieved, in that the iris diaphragm (5) has at least three diaphragm leaves (6, 6′, 6″, or 7, 7′, 7″, 7′″, or 8, 8′, 8″, 8′″, 8″″, or 9, 9′, 9″, 9′″, 9″″, 9′″″) which have touching side surfaces (10) enclosing the same angle (α), wherein the diaphragm leaves (6, 6′, 6″, or 7, 7′, 7″, 7′″, or 8, 8′, 8″, 8′″, 8″″, or 9, 9′, 9″, 9′″, 9″″, 9′″″) open up a beam-limiting opening (12) such that a sliding movement (13) along the side surfaces (10) takes place by a number of diaphragm leaves (6, 6′, 6″, or 7, 7′, 7″, 7′″, or 8, 8′, 8″, 8′″, 8″″, or 9, 9′, 9″, 9′″, 9″″, 9′″″) which is reduced by at most one.
摘要:
An irradiation device for radiation treatment and a collimator (1) are used to define a beam of high-energy rays (2) with beam limitation by means of an iris diaphragm (5) having adjusting elements (7), and a mechanism that is used to direct the beams (2′) limited by the collimator (1) to the object to be treated (4) from all sides, wherein the parameters for direction, surface area, intensity and time of irradiation can be specified with the help of a control mechanism. An exact three-dimensional irradiation profile is produced, while keeping the costs and efforts regarding mechanical engineering, computation and irradiation time low. This is achieved by using at least one further iris diaphragm (6) located in coaxial alignment in the optical path, whereby the leaves (9, 9′, 9″, 9′″, 9″″, 9′″″) of the iris diaphragms (5, 6) are arranged in a staggered manner and in a rotational sense around their axis (11), so that the beam limited by the collimator (1) has the cross-section of a polygon (12), the number of corners of which complies with the number of the leaves of all iris diaphragms (5, 6), so that the leaves (9, 9′, 9″, 9′″, 9″″, 9′″″) allow for linear adjustment movements (13), the control mechanism being suitable to enable the irradiation of an irregular space through the overlaying and adjoining of many irradiated spaces (28).