Iterative digital subtraction imaging fro emoblization procedures
AssigneeKoninklijke Philips N.V.
InventorsMARKUS JOHANNES HARMEN DEN HARTOG, RAOUL FLORENT
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Abstract
Method and related system (IPS) for visualizing in particular a volume of a substance during its deposition at a region of interest (ROI). A difference image is formed from a projection image and a mask image. The difference image is then analyzed to derive more accurate motion information about a motion or shape of the substance. The method or system (IPS) is capable of operating in an iterative manner. The proposed system and method can be used for processing fluoroscopic X-ray frame acquired by an imaging arrangement (100) during an embolization procedure.
Claims11
An image processing system, comprising the following components:
- an input port configured to receive i) a projection image acquired of a region of interest, ROI, in a specimen whilst a substance is present at or around said ROI and ii) a mask image acquired at a different instant than the projection image when less of said substance is present, an amount of said substance capable of building up over time;
- ROI focused motion compensator that operates to register the mask image and the projection image to motion compensate for a motion of the ROI;
- a subtractor configured to subtract, after said image registration, the mask image from the projection image to obtain a difference image;
- an image enhancer configured to filter the difference image for an image portion that represents the ROI;
- a motion estimator configured to establish motion information in respect of a motion of the ROI, based on the filtered difference image and based on i) the projection image or ii) the mask image;
- and
- an update module configured to provide said estimated motion information into at least one of the motion compensator and the image enhancer and/or configured to adjust at least one of:
- a subsequent projection image or a subsequent mask image to be provided to the motion compensator.
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An image processing method implemented by one or more components, comprising the steps of:
- a) receiving a projection image acquired of a region of interest, ROI, in a specimen whilst a substance is present at or around said ROI and ii) a mask image, the mask projection image acquired at a different instant than the projection image when less of said substance is present, an amount of said substance capable of building up over time;
- b) registering the mask image and the projection image to motion compensate for a motion of the ROI;
- c) subtracting, after said image registration, the mask image from the projection image to obtain a difference image;
- d) enhancing the difference image for an image portion that represents the ROI;
- e) estimating a motion of the ROI based on the enhanced difference image and based on i) the projection image or ii) the mask image;
- and
- f) using the estimated motion information as input for a subsequent iteration of the method.
Dependencies are inferred from the claim text.