| 摘要 |
<p>An x-ray imaging system (10) includes a detector (18) positioned to receive x-rays (14, 69), and an x-ray tube (12) coupled to a mount structure. The x-ray tube (12) is configured to generate x-rays (14, 69) toward the detector (18) and includes a target (57), a cathode cup (73), an emitter (55) attached to the cathode cup (73) and configured to emit a beam of electrons (67) toward the target (57), the emitter (55) having a length and a width, and a one-dimensional grid (70) positioned between the emitter (55) and the target (57) and attached to the cathode cup (73) at one or more attachment points (80). The one-dimensional grid (70) includes a plurality of rungs (72) that each extend in a direction of the width of the emitter (40), and the plurality of rungs (72) are configured to expand and contract relative to the one or more attachment points (80) without substantial distortion with respect to the emitter (55).
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