Method and apparatus for virtual digital subtraction angiography
First Claim
Patent Images
1. A medical imaging system to compare a first set of images and a second set of images, comprising:
- a tracking subsystem having a dynamic reference frame marker configured to be physically attached to a patient, wherein the tracking subsystem is configured to detect the dynamic reference frame marker at both a first time to determine a first patient position data corresponding to a first set of images acquired with an imaging system and at a second time to determine a second patient position data corresponding to a second set of images acquired with the imaging system, where the first and second patient position data is indicative of a position of the patient, wherein the second time is after the first time;
a motion correction subsystem operable to receive the first patient position data relative to the imaging system at the first time and second patient position data relative to the imaging system at the second time corresponding to each of the first and second sets of images and the motion correction subsystem is operable to determine a change between at least the first patient position data and the second patient position data, wherein said motion correction subsystem is operable to execute an algorithm to compare the first patient position data and the second patient position data to determine a change between the first patient position data at the first time and the second patient position data at the second time and correct at least one of the first set of images or the second set of images for differences in at least one of position or orientation based on the determined change in the second patient position data relative to the first patient position data; and
an image subtraction subsystem operable to receive at least the first set of images and the second set of images, the image subtraction subsystem is operable to perform a digital subtraction operation between the first set of images and the second set of images to determine a difference between the first set of images and the second set of images when no change equal to or less than a threshold value occurs between the first and second patient position data.
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Abstract
A method and apparatus for allowing determination of patient position change relative to an imaging device and/or allowing digital subtraction in an operative position. The system can include devices for determining a position of a patient at various times and comparing the various positions of the patient. Further, a digital subtraction may be performed if the patient change is not above a threshold value and/or if motion correction can occur.
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Citations
50 Claims
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1. A medical imaging system to compare a first set of images and a second set of images, comprising:
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a tracking subsystem having a dynamic reference frame marker configured to be physically attached to a patient, wherein the tracking subsystem is configured to detect the dynamic reference frame marker at both a first time to determine a first patient position data corresponding to a first set of images acquired with an imaging system and at a second time to determine a second patient position data corresponding to a second set of images acquired with the imaging system, where the first and second patient position data is indicative of a position of the patient, wherein the second time is after the first time; a motion correction subsystem operable to receive the first patient position data relative to the imaging system at the first time and second patient position data relative to the imaging system at the second time corresponding to each of the first and second sets of images and the motion correction subsystem is operable to determine a change between at least the first patient position data and the second patient position data, wherein said motion correction subsystem is operable to execute an algorithm to compare the first patient position data and the second patient position data to determine a change between the first patient position data at the first time and the second patient position data at the second time and correct at least one of the first set of images or the second set of images for differences in at least one of position or orientation based on the determined change in the second patient position data relative to the first patient position data; and an image subtraction subsystem operable to receive at least the first set of images and the second set of images, the image subtraction subsystem is operable to perform a digital subtraction operation between the first set of images and the second set of images to determine a difference between the first set of images and the second set of images when no change equal to or less than a threshold value occurs between the first and second patient position data. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16, 17)
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18. A medical imaging system operable to capture two or more image sets representative of a patient, comprising:
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a tracking subsystem configured to track a tracking marker fixed to the patient to detect a first patient position data, the tracking subsystem also configured to detect a first imaging device position data corresponding to a first image set at a first time and track the tracking marker fixed to the patient to detect a second patient position data and a second imaging device position data corresponding to a second image set at a second time different from the first time, where the first and second patient position data is indicative of a first and second position of a patient, respectively, and the first and second imaging device position data is indicative of a first and second position of an imaging device, respectively, at the first time and second time where the second time is later than the first time; and a motion correction subsystem operable to receive the first patient position data relative to the imaging device and second patient position data relative to the imaging device from the tracking subsystem corresponding to each of the first image set and the second image set and the first imaging device position data and the second imaging device position data from the tracking subsystem corresponding to the first image set and the second image set, respectively, wherein the motion correction subsystem is operable to determine a change in relative position between the patient and the imaging device based upon the received first patient position data, first imaging device position data, second patient position data, and second imaging device position data, and, upon determining that the change in the relative position is equal to or greater than a threshold change value, compensate in at least one of the first image set or the second image set for the determined change in relative position, prior to an image subtraction subsystem performing a digital subtraction operation; wherein the determined change in relative position is due to at least one of motion of the patient or motion of the imaging device between the first time and the second time; wherein the compensation includes the motion correction subsystem correcting at least one of the first image set or the second image set based on the determined change. - View Dependent Claims (19, 20, 21, 22, 23, 24, 25, 26, 27, 28, 29, 30, 31)
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32. A method for performing a digital subtraction operation in a medical imaging device, comprising:
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determining a first patient position data with a tracking system, the first patient position data indicative of a first position of a patient relative to an imaging system during an acquisition of a first image set at a first time; determining a second patient position data with the tracking system, the second patient position data indicative of a second position of the patient relative to the imaging system during an acquisition of a second image set at a second time later than the first time; determining if a change equal to or greater than a threshold value occurs in between the determined first patient position data and the second patient position data during a time interval between the acquisition of the first image set and the acquisition of the second image set based at least on the determined first patient position data and the detected second patient position data; performing a motion correction on at least the first image set or the second image set if the determined change is equal to or greater than the threshold value, wherein the motion correction includes correction for motion parallel to an axis of the first image set or the second image set, motion perpendicular to an axis of the first image set or the second image set, motion rotational around the axis of the first image set or the second image set, or combinations thereof determined as a position change of the patient relative to an image device that acquired the respective first image set and second image set; and performing a digital subtraction operation between the first image set and the second image set when the determined change is within the threshold value between one of the first image set and the corrected second image set or the second image set and the corrected first image set. - View Dependent Claims (33, 34, 35, 36, 37, 38, 39, 40, 41, 42, 43, 44, 45, 46, 47, 48, 49, 50)
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Specification