MRI system with means to eliminate object movement whilst acquiring its image
First Claim
Patent Images
1. A method for reducing the effect of object movements along magnetic resonance imaging (MRI), the method comprising steps of:
- during MRI imaging of an object;
a. acquiring a sequence, CI, of N consecutive MRI images where N is greater than 1, CIn, of the object;
b. for each of the N consecutive MRI images CIn, storing on a computer readable medium (CRM) at least one parameter, p, indicating a spatial image orientation at which a respective MRI image of the N consecutive MRI images said image was taken;
c. detecting movement of the object with one or more non-MRI motion detectors, and for each detected movement M analyzing the sequence CI to find a corresponding sequence CIM of KM images, CIkM, that were taken during said movement M;
d. for each detected movement M, determining a starting time TMS of said movement, an ending time TME of said movement, a time length TM of said movement, and a movement spatial image orientation parameter PMS at the beginning the movement;
e. for each detected movement M, whose TM is shorter than a predetermined time length PT;
(i) acquiring a new sequence, NCIkM, of KM consecutive MRI images, NCIkM, starting at said PMS and(ii) replacing said sequence CIkM with said NCIkM;
f. repeating steps (c)-(e) until no more movements whose TM is shorter than said PT can be detected to produce an image sequence with reduced object-movement.
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Abstract
A method of reducing the effect of object movements along MRI imaging. The method includes: acquiring a sequence of MRI consecutive images of an object; storing on a computer readable medium, for each of the images, at least one parameter p indicating spatial image orientation at which the image was taken; analyzing the sequence of the images for detection of the object movement; and tagging images of at least one movement of the object.
57 Citations
19 Claims
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1. A method for reducing the effect of object movements along magnetic resonance imaging (MRI), the method comprising steps of:
during MRI imaging of an object; a. acquiring a sequence, CI, of N consecutive MRI images where N is greater than 1, CIn, of the object; b. for each of the N consecutive MRI images CIn, storing on a computer readable medium (CRM) at least one parameter, p, indicating a spatial image orientation at which a respective MRI image of the N consecutive MRI images said image was taken; c. detecting movement of the object with one or more non-MRI motion detectors, and for each detected movement M analyzing the sequence CI to find a corresponding sequence CIM of KM images, CIkM, that were taken during said movement M; d. for each detected movement M, determining a starting time TMS of said movement, an ending time TME of said movement, a time length TM of said movement, and a movement spatial image orientation parameter PMS at the beginning the movement; e. for each detected movement M, whose TM is shorter than a predetermined time length PT; (i) acquiring a new sequence, NCIkM, of KM consecutive MRI images, NCIkM, starting at said PMS and (ii) replacing said sequence CIkM with said NCIkM; f. repeating steps (c)-(e) until no more movements whose TM is shorter than said PT can be detected to produce an image sequence with reduced object-movement. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9)
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10. A magnetic resonance imaging (MRI) system imaging a movable object comprising:
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a. an MRI device adapted to take a sequence, CI, of N consecutive MRI images where N is greater than 1, CIn, of an object; b. each of the N consecutive MRI images is characterized by at least one parameter p indicating a spatial image orientation at which a respective MRI image of the N consecutive MRI images was taken; c. a computer readable medium (CRM) in communication with said MRI device;
said CRM having instructions thereon for executing a method comprising steps of;during MRI imaging of the object; i. detecting movement of the object with one or more non-MRI motion detectors, and, for each detected movement M analyzing the sequence to find a corresponding sequence CIM of KM images, CIkM, in which said movement M is detected, ii. for each detected movement M, determining a starting time TMS of said movement, an ending time TME of said movement, a time length TM of said movement, and a movement spatial image orientation parameter PMS at the beginning the movement, iii. for each said M, whose TM is shorter than a predetermined time length PT; (a) acquiring a new sequence, NCIkM, of KM consecutive MRI images, NCIkM, starting at said PMS, and (b) replacing said sequence CIkM with said NCIkM; iv. repeating steps (i)-(iii) until no more movements whose TM is shorter from said PT can be detected to produce an image sequence with reduced object-movement. - View Dependent Claims (11, 12, 13, 14, 15, 16, 17, 18, 19)
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Specification