COMPUTED TOMOGRAPHY METHOD
First Claim
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1. A computed tomography method comprising the steps of:
- generating a circular relative motion between an examination zone and a radiation source about an axis of rotational,generating a conical radiation beam using the radiation source, wherein the conical radiation beam is emitted from an emitting area of the radiation source, wherein the conical radiation beam traverses the examination zone and wherein the position of the emitting area is moved parallel to the axis of rotation during the relative motion,acquiring measured values using a detector unit during the relative motion, wherein the measured values depend on the intensity of the conical radiation beam after traversing the examination zone,switching the position of the emitting area between at least two positions spaced apart from each other and arranged on a line parallel to the axis of rotation during the relative motion,reconstructing an image of the examination zone using the measured values.
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Abstract
A computed tomography method and apparatus are provided wherein a radiation source moves circularly relative to an examination zone about an axis of rotation (14). The radiation source produces a cone beam of x-rays and the focal point of this cone beam is switched between at least two positions (23a, 23b) spaced apart from each other and arranged on a line parallel to the axis of rotation to enlarge the reconstructable examination zone parallel to the axis of rotation. Preferably, the image of the examination zone is reconstructed using an iterative reconstruction method, in particular an algebraic reconstruction method or a maximum likelihood method.
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7 Claims
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1. A computed tomography method comprising the steps of:
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generating a circular relative motion between an examination zone and a radiation source about an axis of rotational, generating a conical radiation beam using the radiation source, wherein the conical radiation beam is emitted from an emitting area of the radiation source, wherein the conical radiation beam traverses the examination zone and wherein the position of the emitting area is moved parallel to the axis of rotation during the relative motion, acquiring measured values using a detector unit during the relative motion, wherein the measured values depend on the intensity of the conical radiation beam after traversing the examination zone, switching the position of the emitting area between at least two positions spaced apart from each other and arranged on a line parallel to the axis of rotation during the relative motion, reconstructing an image of the examination zone using the measured values. - View Dependent Claims (2, 3, 4, 5, 6, 7)
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Specification