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GANTRY RING X-RAY FILTER

IP.com Disclosure Number: IPCOM000239683D
Publication Date: 2014-Nov-25
Document File: 3 page(s) / 50K

Publishing Venue

The IP.com Prior Art Database

Abstract

The invention proposes a technique to filter high-energy exposures in a spectral imaging mode during an x-ray computed tomography. The technique includes a segmented ring, which rotates independent of a gantry to filter high-energy exposures in the x-ray computed tomography. The segmented ring includes alternate filtering and non-filtering segments, which are arranged inside bore of the gantry. The segmented ring has same axis of rotation as that of the gantry. An x-ray tube rotates around the patient during the spectral imaging and acquires complimentary high peak kilo voltage (kVp) and low kVp exposures. During rotation the segments of the ring filter cross the tube window such that the x-ray beam is largely attenuated during high kVp exposure and without additional attenuation during low kVp exposure.

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GANTRY RING X-RAY FILTER

BRIEF ABSTRACT

The invention proposes a technique to filter high-energy exposures in a spectral imaging mode during an x-ray computed tomography. The technique includes a segmented ring, which rotates independent of a gantry to filter high-energy exposures in the x-ray computed tomography. The segmented ring includes alternate filtering and non-filtering segments, which are arranged inside bore of the gantry. The segmented ring has same axis of rotation as that of the gantry. An x-ray tube rotates around the patient during the spectral imaging and acquires complimentary high peak kilo voltage (kVp) and low kVp exposures. During rotation the segments of the ring filter cross the tube window such that the x-ray beam is largely attenuated during high kVp exposure and without additional attenuation during low kVp exposure.

KEYWORDS

A segmented ring, filter, Spectral imaging, x-ray tubes


DETAILED DESCRIPTION

Generally, moving a filter in and out of an x-ray beam cross section mechanically within micro seconds (┬Ásec) is difficult. Filtering provides benefits in terms of material differentiation and image quality.

A conventional technique includes a filter, which rotates around the tube while mounted on the gantry. However, the filters require to rotate faster and experience the G-loading and gyroscopic forces associated with rotation on the gantry.

Another conventional technique includes fast kV switching as dual energy acquisition technique to low and high tube voltage during computed tomography (CT). However, the conventional technique is not efficient to filter high-energy exposures in a spectral imaging mode.

Therefore, there is a need for a technique to filter high-energy exposures in a spectral imaging mode during CT.

The invention proposes a technique to filter high-energy exposures in a spectral imaging mode during an x-ray computer tomography. The technique includes a segmented ring, which rotates independent of a gantry to filter high-energy exposures in the x-ray computer tomography. The segmented ring includes alternate filtering and non-filtering segments, which are arranged inside bore of the gantry. The segmented ring has same axis of rotation as of the gantry. An x-ray tube rotates around the patient duirng the spectral imaging and acquires complimentary high peak kilo voltage (kVp) and low kVp exposures. During rotation the segments of the ri...