公开(公告)号：US20220037048A1

公开(公告)日：2022-02-03

申请号：US17276243

申请日：2019-09-18

Applicant: KONINKLIJKE PHILIPS N.V.

Inventor： ROGER STEADMAN BOOKER ,  EWALD ROESSL ,  DENNIS JOHN VERSTEEG

IPC: G21K1/06 ,  G01N23/041

Abstract: A switchable grating for phase contrast imaging comprising a reservoir with a medium and x-ray absorbing particles acoustically connected to a first ultrasound generator and a second ultrasound generator arranged along a side of the reservoir orthogonal to the first side. The ultrasound generators are each, individually or together, configured to generate a soundwave with a frequency and phase such that a standing wave is formed within the medium causing the x-ray absorbing particles to organize along pressure nodes of the standing waves.