METAL SEGMENTATION METHOD USING DUAL ENERGY X-RAY PROJECTION, METAL ARTIFACT REMOVAL METHOD, AND X-RAY IMAGE ACQUISITION DEVICE USING SAME

Disclosed is a method by which a device for reconfiguring an X-ray image by using an X-ray CT imaging device or the X-ray projection data of a plurality of frames accurately segments a metal image (metal segmentation) in X-ray projection data by using dual energy X-ray projection so as to remove a m...

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Bibliographic Details
Main Author CHOI, Sung-Il
Format Patent
LanguageEnglish
French
Korean
Published 24.01.2019
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Summary:Disclosed is a method by which a device for reconfiguring an X-ray image by using an X-ray CT imaging device or the X-ray projection data of a plurality of frames accurately segments a metal image (metal segmentation) in X-ray projection data by using dual energy X-ray projection so as to remove a metal artifact. The metal segmentation method according to the present invention comprises the steps of: (a) acquiring dual energy projection data including high-energy projection data and low-energy projection data of the same angle and the same time for the same subject in each of a plurality of frames; and (b) segmenting a metal part of the subject by using a signal strength difference per part between the high-energy projection data and the low-energy projection data, which has been transmitted through the subject by the same path. L'invention concerne un procédé par lequel un dispositif pour reconfigurer une image radiographique à l'aide d'un dispositif d'imagerie TDM à rayons X ou les données de projection de rayons X d'une pluralité de trames segmente avec précision une image de métal (segmentation de métal) dans des données de projection de rayons X à l'aide d'une projection de rayons X à double énergie de façon à éliminer un artefact métallique. Le procédé de segmentation de métal selon la présente invention comprend les étapes consistant à : (a) acquérir des données de projection à double énergie comprenant des données de projection à haute énergie et des données de projection à basse énergie du même angle et du même moment pour le même sujet dans chaque trame d'une pluralité de trames ; et (b) segmenter une partie métallique du sujet en utilisant une différence d'intensité de signal par partie entre les données de projection à haute énergie et les données de projection à basse énergie, qui ont été transmises à travers le sujet par le même trajet. 엑스선 CT 촬영 장치 또는 다수 프레임의 엑스선 프로젝션 데이터를 이용하여 엑스선 영상을 재구성하는 장치에서, 금속 인공음영을 제거하기 위해 듀얼 에너지 엑스선 프로젝션을 이용하여 엑스선 프로젝션 데이터에서 금속 이미지를 정확하게 구분(metal segmentation)하는 방법이 개시된다. 본 발명에 따른 금속 이미지 구분 방법은, (a) 다수의 프레임마다 동일 피검체에 대한 동일 각도, 동일 시간의 고에너지 프로젝션 데이터와 저에너지 프로젝션 데이터를 포함하는 듀얼 에너지 프로젝션 데이터를 획득하는 단계; 및, (b) 피검체를 동일한 경로로 투과한 고에너지 프로젝션 데이터 및 저에너지 프로젝션 데이터 사이의 부분별 신호 강도 차이를 이용하여 상기 피검체 중 금속 부분을 구분하는 단계를 포함한다.
Bibliography:Application Number: WO2018KR08299