Waveguide and computed tomography system with a waveguide
First Claim
1. An apparatus comprising a radar sensor emitting electromagnetic waves said radar sensor including an antenna, a control unit and at least one waveguide for the focusing of the electromagnetic waves on an area of interest of a subject to be examined, wherein the waveguide includes outer walls forming a channel with a width and a height for propagation of the electromagnetic waves, the channel having a first opening and a second opening, wherein the walls are non-metal hollow walls filled with an electrically conductive liquid or gel, and the at least one waveguide having the first opening oriented towards the radar sensor.
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Abstract
The invention relates to a waveguide (24) for focusing electromagnetic energy on an area of interest, said waveguide (24) comprising outer walls forming a channel with a width (w) and a height (h) for the propagation of the electromagnetic waves. In order to be able to focus the EM waves on an area of interest, i.e. the chest of a patient (20), so that influences which other moving objects in the environment have on the waves, are shielded away, the channel is provided with a first opening and a second opening wherein said walls are non-metal hollow walls filled with an electrically conductive liquid. The waveguide (24) can be used for example with a computed tomography system (12) CT with a rotating gantry (16) and a patient table (18). The waveguide (24) will not produce artefacts in the CT image by scattering the X-ray, like a metal wall would do it. Nevertheless the conductive liquid makes the construction work as a waveguide for EM waves.
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Citations
19 Claims
- 1. An apparatus comprising a radar sensor emitting electromagnetic waves said radar sensor including an antenna, a control unit and at least one waveguide for the focusing of the electromagnetic waves on an area of interest of a subject to be examined, wherein the waveguide includes outer walls forming a channel with a width and a height for propagation of the electromagnetic waves, the channel having a first opening and a second opening, wherein the walls are non-metal hollow walls filled with an electrically conductive liquid or gel, and the at least one waveguide having the first opening oriented towards the radar sensor.
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13. A computed tomography system with a rotating gantry, said computed tomography system comprising:
- a system control, and an apparatus, comprising;
a radar sensor emitting electromagnetic waves, the radar sensor including an antenna, a control unit and at least one waveguide for focusing electromagnetic energy on an area of interest, the waveguide comprising outer walls forming a channel with a width and a height for propagation of the electromagnetic waves, the channel having a first opening and a second opening, and the at least one waveguide having the first opening oriented towards the radar sensor, wherein the walls are non-metal hollow walls filled with an electrically conductive liquid or gel, wherein the apparatus detects motion in a patient due to respiration or due to blood pumping of the heart and provides a gating signal to a system controlling the gating signal triggering an acquisition of CT data.
- a system control, and an apparatus, comprising;
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14. A method, comprising:
focusing, via a waveguide of a radar sensor of an apparatus, electromagnetic energy on an area of interest, said waveguide comprising outer walls forming a channel with a width and a height for the propagation of the electromagnetic waves, said channel having a first opening and a second opening, wherein said walls are non-metal hollow walls filled with an electrically conductive liquid or gel and the first opening oriented towards the radar sensor, and the radar sensor emitting the electromagnetic energy and further including an antenna and a control unit. - View Dependent Claims (15, 16, 17, 18, 19)
Specification