Method and medical imaging system for compensating for patient motion
First Claim
1. A method of compensating for patient motion when recording a series of medical images consisting of 2D medical images, wherein the medical images consisting of 2D 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, and a current spatial position of the examination area is determined relative to a frame of reference assigned to the imaging system, by a localization system, the method comprising:
- determining a first spatial position of the examination area substantially in parallel with recording a first medical image consisting of 2D medical image of the series;
recording farther medical images consisting of 2D medical images of the series;
continuously determining the current spatial position of the examination area for each current recorded further medical image consisting of 2D medical image, by the localization system while recording the series of medical images consisting of 2D medical images;
determining a difference between each current and the first spatial positions based on the each current recorded farther medical image consisting of 2D medical image and the first medical image consisting of 2D medical image; and
compensating the difference on the each current recorded further medical image consisting of 2D medical image by adjusting the imaging system such that the first and further medical images consisting of 2D medical images show the examination area in the same position and orientation.
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Accused Products
Abstract
The present invention relates to a method and also an imaging system to compensate for patient motion when recording a series of images in medical imaging, in which a number of images of an area under examination of a patient (17) are recorded at intervals with an imaging system (1) and are related to one another. With the method a localization system (2) is used as the series of images are being recorded to permanently or at a time close to the recording of the individual images, record a momentary spatial location of the area under examination in a reference system permanently linked to the imaging system (1), a first spatial location of the area under examination recorded close to the time of recording of a first image is stored, and a deviation of the images recorded momentarily in each case of the first spatial location is determined and by changing the geometrical circumstances of the imaging system (1) at a time to close the recording of the spatial location and/or through geometrical adaptation of an image content of an image just recorded, is at least approximately commentated for, so that the images show the area under examination in the same position and orientation. The method does not require any time-consuming interaction with the operator and is also suitable for compensating for larger movements of the patient.
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Citations
19 Claims
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1. A method of compensating for patient motion when recording a series of medical images consisting of 2D medical images, wherein the medical images consisting of 2D 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, and a current spatial position of the examination area is determined relative to a frame of reference assigned to the imaging system, by a localization system, the method comprising:
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determining a first spatial position of the examination area substantially in parallel with recording a first medical image consisting of 2D medical image of the series; recording farther medical images consisting of 2D medical images of the series; continuously determining the current spatial position of the examination area for each current recorded further medical image consisting of 2D medical image, by the localization system while recording the series of medical images consisting of 2D medical images; determining a difference between each current and the first spatial positions based on the each current recorded farther medical image consisting of 2D medical image and the first medical image consisting of 2D medical image; and compensating the difference on the each current recorded further medical image consisting of 2D medical image by adjusting the imaging system such that the first and further medical images consisting of 2D medical images show the examination area in the same position and orientation. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15)
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16. An imaging system, comprising:
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at least one radiation source; a radiation detector that records a series of medical images of an examination area of a patient; a patient table adjustable by a motor operatively connected to the patient table; a localization system for detecting patient motion; an image processing unit for processing the recorded image; a control unit for controlling the radiation source, the radiation detector, the patient table and the image processing unit; an image display unit, wherein the radiation source, the radiation detector and the patient table are adjustable components and the mutual positioning of which relative to each other defines the geometrical proportions of the imaging system; and a compensation unit for adjusting the imaging system in real time using the control unit such that the motion of the patient recorded by the localization system is compensated for, wherein the compensation unit is configured to; determine a first spatial position of the examination area substantially in parallel with recording a first medical image consisting of 2D medical image of the series; continuously determine a current spatial position of the examination area for each current recorded further medical image consisting of 2D medical image, by the localization system while recording the further medical images of the series consisting of 2D medical images; determine a difference between each current and the first spatial positions based on the each current recorded farther medical image consisting of 2D medical image and the first medical image consisting of 2D medical image; and compensate the difference on the each current recorded further medical image consisting of 2D medical image by adjusting the imaging system such that the first and further medical images consisting of 2D medical images show the examination area in the same position and orientation. - View Dependent Claims (17, 18, 19)
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Specification