公开(公告)号：US20220061794A1

公开(公告)日：2022-03-03

申请号：US17419088

申请日：2019-12-27

Applicant: CARESTREAM DENTAL LLC

Inventor： Jay S. SCHILDKRAUT ,  Jean-Marc INGLESE ,  Krishnamoorthy SUBRAMANYAN ,  Vincent LOUSTAUNEAU

IPC: A61B6/00 ,  G01T1/169 ,  G01T1/36

Abstract: The present disclosure describes methods for calibrating a spectral X-ray system to perform material decomposition with a single scan of an energy discriminating detector or with a single scan at each used X-ray spectrum. The methods may include material pathlengths exceeding the size of the volume reconstructable by the system. Example embodiments include physical and matching calibration phantoms. The physical calibration phantom is used to measure the attenuation of X-rays passing therethrough with all combinations of pathlengths through the calibration's basis materials. The matching digital calibration phantom is registered with the physical calibration phantom and is used to calculate the pathlength though each material for each measured attenuation value. A created data structure includes the X-ray attenuation for each X-ray spectrum or detector energy bin for all combinations of basis material pathlengths. The data structure is usable to perform a material decomposition on the X-ray projection of an imaged object.

公开(公告)号：US20220151576A1

公开(公告)日：2022-05-19

申请号：US17431743

申请日：2020-03-11

Applicant: CARESTREAM DENTAL LLC

Inventor： Krishnamoorthy SUBRAMANYAN ,  Vincent LOUSTAUNEAU ,  Jay S. SCHILDKRAUT ,  Jean-Marc INGLESE

IPC: A61B6/00 ,  A61B6/02 ,  A61B6/14 ,  A61B6/06 ,  A61B90/00

Abstract: An intraoral tomosynthesis imaging apparatus having an intraoral detector coupled to a frame or radio-opaque marker attached to its radiation facing surface without any frame attached, wherein the frame defines a target aperture for an incident radiation beam. An enclosure seats against the target aperture and houses at least one x-ray source configured to emit a radiation beam from each of a plurality of focal points within the enclosure A collimator is disposed to form a collimated radiation beam and direct the collimated beam through the target aperture and to the detector. A geometric calibration phantom having a plurality of radio-opaque markers is disposed in the path of the collimated beam. This arrangement is modified to operate as a regular intraoral imaging device by accommodating a high-power central source at the same or different distances as other sources from the detector and displacing the phantom from the field of view.