Method for providing a magnetic resonance image from respiration-gated image data
First Claim
1. A method for composing an MR image from respiration-gated scan data, comprising performing the following steps on an MR unit which derives spin echoes from MR scans and which utilizes a phase coding gradient to identify locations from which such spin echos originate:
- changing the phase coding gradient in steps through its entire range at most once per respiration cycle;
conducting a plurality of MR scans at each phase coding gradient;
storing, for each scan, all the spin echos;
storing, for each scan, information relating to respiratory motion;
comparing said information with a reference value in accordance with a predetermined criterion;
determining, for each phase coding gradient, a best scan in which said criterion is best satisfied; and
using only spin echos from said best scans to compose the MR image.
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Abstract
A method and a device for the composition of an MR image with respiration-controlled recording of the spin echoes. The phase coding gradient of an MR equipment is stepped as a function of a motion phase of the respiratory motion once per respiration cycle. With a constant phase coding gradient several scans, possibly EKG-triggered, are then recorded within the respiration cycle. The spin echo signals recorded for each scan are stored in a first memory. In a second memory, the amplitude of the respiratory motion at the respective scan moment is stored. Then a comparison of all stored amplitude of the respiratory motion with a reference value R is made. For the composition of the MR image only that scan per respiration cycle is used for which the respective amplitude of the respiratory motion fulfills a given criterion with respect to the reference value R.
49 Citations
12 Claims
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1. A method for composing an MR image from respiration-gated scan data, comprising performing the following steps on an MR unit which derives spin echoes from MR scans and which utilizes a phase coding gradient to identify locations from which such spin echos originate:
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changing the phase coding gradient in steps through its entire range at most once per respiration cycle; conducting a plurality of MR scans at each phase coding gradient; storing, for each scan, all the spin echos; storing, for each scan, information relating to respiratory motion; comparing said information with a reference value in accordance with a predetermined criterion; determining, for each phase coding gradient, a best scan in which said criterion is best satisfied; and using only spin echos from said best scans to compose the MR image. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12)
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Specification