X-ray examination apparatus incorporating image subtraction
First Claim
Patent Images
1. A method of X-ray examination which comprises;
- propagating a bolus of contrast medium through an object undergoing examination;
detecting a series of mask images and contrast images while the object contains different concentrations of said contrast medium and where each image is taken at a time when the contrast medium concentration is different from that of a previous image;
subtracting a mask image from a corresponding adjacent contrast image taken when said object has a higher contrast medium concentration than said mask image; and
laterally displacing the object with respect to an imaging system, the lateral displacement being coordinated with the propagation of the bolus through the object so that the mask images and the contrast images are both formed in rapid succession on the same edge of the bolus.
1 Assignment
0 Petitions
Accused Products
Abstract
An X-ray examination apparatus incorporating digital image subtraction in which from a series of images to be formed of an object with and without contrast medium those images are selected for subtraction which result in ultimate images which combine a low motional unsharpness with adequate contrast. Images are also formed on at least one of the edges of the contrast bolus, so that in each position several contrast images can be formed with a single contrast bolus.
-
Citations
3 Claims
-
1. A method of X-ray examination which comprises;
-
propagating a bolus of contrast medium through an object undergoing examination; detecting a series of mask images and contrast images while the object contains different concentrations of said contrast medium and where each image is taken at a time when the contrast medium concentration is different from that of a previous image; subtracting a mask image from a corresponding adjacent contrast image taken when said object has a higher contrast medium concentration than said mask image; and laterally displacing the object with respect to an imaging system, the lateral displacement being coordinated with the propagation of the bolus through the object so that the mask images and the contrast images are both formed in rapid succession on the same edge of the bolus. - View Dependent Claims (2, 3)
-
Specification
-
- Resources
Litigation Campaign Assessment
Thank you for your request. You will receive a custom alert email when the Litigation Campaign Assessment is available.
×
-
Current AssigneeUS Philips Corporation (Koninklijke Philips N.V.)
-
Original AssigneeUS Philips Corporation (Koninklijke Philips N.V.)
-
InventorsJanssen, Jozef T. A., van Benthem, Adrianus C.
-
Primary Examiner(s)Church, Craig E.
-
Assistant Examiner(s)Freeman, John C.
-
Application NumberUS06/685,649Time in Patent Office1,135 DaysField of Search378/99, 378/4, 358/111, 128/654US Class Current378/98.5CPC Class CodesA61B 6/481 involving the use of contra...A61B 6/504 for diagnosis of blood vess...
