Determining the position of an axis of rotation (patient positioning table, radiation therapy) on the basis of an angle of rotation and a chord through a movable mark
First Claim
1. A method for determining the position of an axis of rotation (TA) of a body (7) with reference to a spatial point (IC) in which the spatial point is initially marked with a marker (5) located on the body (7) and a rotation of the body (7) about a selected angle (φ
- ) is then made and the distance (ν
t) covered by the marker (5) in this case is measured, characterised in that the distance vector (s(0)) between the spatial point (IC) and the axis of rotation (TA) is calculated using the distance covered (ν
t) and the selected angle of rotation (φ
).
1 Assignment
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Accused Products
Abstract
For precision radiation therapy it is essential that the patient be positioned as accurately as possible with reference to the irradiation center (IC). To this end, an axis of rotation (TA) of a patient positioning table (7) is first determined in terms of its position and is then aligned correspondingly. For determining the position, a mark (5) is introduced into the isocenter (IC) of the irradiation device and rotates with the patient positioning table (7). The distance between the axis of rotation (TA) and the isocenter (IC) is determined on the basis of the distance (P, IC) traveled and the angle of rotation (φ), and the axis of rotation is then aligned correspondingly.
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Citations
10 Claims
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1. A method for determining the position of an axis of rotation (TA) of a body (7) with reference to a spatial point (IC) in which the spatial point is initially marked with a marker (5) located on the body (7) and a rotation of the body (7) about a selected angle (φ
- ) is then made and the distance (ν
t) covered by the marker (5) in this case is measured, characterised in that the distance vector (s(0)) between the spatial point (IC) and the axis of rotation (TA) is calculated using the distance covered (ν
t) and the selected angle of rotation (φ
). - View Dependent Claims (2, 3, 4, 5, 6)
- ) is then made and the distance (ν
- 7. A measuring arrangement for determining the position of an axis of rotation (TA) of a body (7) with reference to a spatial point (IC), characterised by a measuring table (1) which is positioned with reference to the body (7) via positioning means (6) and which comprises a measuring tip (4), a device (2, 3) for adjusting the measuring tip with reference to the positioning means (6) in at least two dimensions (XM, YM) as well as a device for determining the adjusted distance (ν
Specification