Patent ID: 7630751
Filing Date: 2009-12-08
Classification: A61B,G06T

Abstract:
1. A method of compensating for patient motion when recording a series of medical images useful in conjunction with a digital subtraction angiography or a pathfinding technique, wherein the medical images of an examination area of a patient are recorded at specific time intervals using an imaging system and are correlated with each other, the method comprising: recording a three-dimensional image data set of the examination area, the three-dimensional image data set defining a frame of reference; recording a first 2D image of the examination area; determining a first spatial position of the examination area relative to the frame of reference by registering said first 2D image with said three-dimensional image data set; recording further 2D medical images of the series and registering each further recorded 2D medical image with the three-dimensional image data set immediately after its recording for determining a current spatial position of the examination area relative to the frame of reference; determining a difference between the current and the first spatial positions; and compensating for the difference by adjusting at least one geometrical proportion of the imaging system wherein the recording further 2D medical images and compensating for the difference is conducted continuously and in real time; wherein the geometrical proportion is adjusted immediately after registering the recorded medical image with the three-dimensional image data set; and wherein adjusting the geometrical portion includes a translation of a patient table of the imaging system, the translation comprising one, two or three degrees of freedom and/or a rotation of the patient table, the rotation comprising one, two or three degrees of freedom.