Method and device for defining a beam of high-energy rays
First Claim
1. A method for stereotactic, conformal radiation therapy of tumors, the method comprising the steps of:
- a) positioning an iris diaphragm collimator to irradiate the tumor from a first irradiation angle, the iris diaphragm having at least three diaphragm leaves, wherein the diaphragm leaves open up a beam-limiting opening such that a sliding movement along side surfaces of the diaphragm leaves takes place by a number of diaphragm leaves which is reduced by at most one;
b) setting a first aperture opening of the collimator suitable for irradiation of a first region of the tumor;
c) irradiating the tumor;
d) translating the collimator in a direction substantially transverse to said first radiation angle to scan the tumor;
e) irradiating a further region of the tumor;
f) repeating steps d) and e) until a desired region of the tumor is irradiated with the first aperture size;
g) setting a further aperture opening of the collimator which differs from the first aperture opening;
h) repeating steps d) through g) until a desired region of the tumor is irradiated;
i) positioning the iris diaphragm collimator to irradiate the tumor from a second irradiation angle which differs from the first irradiation angle; and
j) repeating steps b) through i) until a desired dose of radiation has been applied to the tumor.
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Abstract
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.
12 Citations
32 Claims
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1. A method for stereotactic, conformal radiation therapy of tumors, the method comprising the steps of:
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a) positioning an iris diaphragm collimator to irradiate the tumor from a first irradiation angle, the iris diaphragm having at least three diaphragm leaves, wherein the diaphragm leaves open up a beam-limiting opening such that a sliding movement along side surfaces of the diaphragm leaves takes place by a number of diaphragm leaves which is reduced by at most one; b) setting a first aperture opening of the collimator suitable for irradiation of a first region of the tumor; c) irradiating the tumor; d) translating the collimator in a direction substantially transverse to said first radiation angle to scan the tumor; e) irradiating a further region of the tumor; f) repeating steps d) and e) until a desired region of the tumor is irradiated with the first aperture size; g) setting a further aperture opening of the collimator which differs from the first aperture opening; h) repeating steps d) through g) until a desired region of the tumor is irradiated; i) positioning the iris diaphragm collimator to irradiate the tumor from a second irradiation angle which differs from the first irradiation angle; and j) repeating steps b) through i) until a desired dose of radiation has been applied to the tumor. - View Dependent Claims (2, 3, 4)
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5. A device for stereotactic, conformal radiation therapy of tumors, the device comprising:
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an iris diaphragm collimator having at least three diaphragm leaves, said diaphragm leaves defining a beam-limiting opening such that a sliding movement along side surfaces of said leaves takes place by a number of diaphragm leaves which is reduced by at most one; a mechanism for positioning said iris diaphragm collimator to irradiate the tumor from an irradiation angle; a mechanism for setting an aperture opening of said iris diaphragm collimator suitable for irradiation of a first portion of the tumor; a mechanism for irradiating the tumor; and a scanning mechanism for translating said iris diaphragm collimator in a direction substantially transverse to said irradiation angle with said irradiation angle and said aperture opening thereby remaining substantially unchanged, thereby permitting irradiation of a second portion of the tumor which differs from the first portion of the tumor. - View Dependent Claims (6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16, 17, 18, 19, 20, 21, 22, 23, 24, 25, 26, 27, 28, 29, 30, 31)
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32. A device for stereotactic, conformal radiation therapy of tumors, the device comprising:
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means for positioning an iris diaphragm collimator to irradiate the tumor from a first irradiation angle, the iris diaphragm having at least three diaphragm leaves, wherein the diaphragm leaves open up a beam-limiting opening such that a sliding movement along side surfaces of the diaphragm leaves takes place by a number of diaphragm leaves which is reduced by at most one; means for setting a first aperture opening of the collimator suitable for irradiation of a first portion of the tumor at said first irradiation angle; means for irradiating the first portion of the tumor at said first irradiation angle; means for translating the collimator in a direction substantially transverse to said first irradiation angle to scan a second portion of the tumor at said first irradiation angle using said first aperture opening, wherein the second portion of the tumor differs from the first portion of the tumor; means for irradiating the second portion of the tumor; means for a setting a second aperture opening of the collimator which differs from the first aperture opening; means for irradiating a third portion of the tumor using the second aperture opening, wherein the third portion of the tumor differs from both the first and second portions of the tumor; and means for positioning the iris diaphragm collimator to irradiate the tumor from a second irradiation angle which differs from the first irradiation angle.
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Specification