METHOD FOR DETERMINING MOTION PARAMETERS OF AN OBJECT IN A MAGNETIC FIELD
First Claim
1. A method for determining motion parameters of an object by way of at least one coil within a magnetic field adapted for a magnetic resonance based imaging device, the method which comprises:
- emitting induced pulses on the coil in order to provide navigator signals that are finally measured in order to provide a spatial position of the object relative to the coil;
generating at least one reference displacement of the object relative to the coil that is spatially and metrically predefined between two positions of the object, so that intensity changes of navigator signals at the coil are measured and recorded in a calibration map;
for determining each one of a sequence of further positions of an object in motion relative to the coil, measuring a navigator signal of the coil and comparing to values of intensity changes from the calibration map in order to provide a corrected value of displacement of the object that is recovered from the calibration map and processed, to thereby determine absolute values of motion parameters of the object.
3 Assignments
0 Petitions
Accused Products
Abstract
A method for determining motion parameters of an object by way of at least one coil within a magnetic field adapted for a magnetic resonance based imaging device. Induced pulses are emitted on the coil in order to provide navigator signals that are finally measured in order to provide a spatial position of the object relative to the coil. At least one reference displacement of the object relative to the coil that is spatially and metrically predefined between two positions of the object is generated so that intensity changes of navigator signals at the coil are measured and recorded in a calibration map. Then, for determining each one of a sequence of further positions of an object in motion relatively to the coil, a navigator signal of the coil is measured and is compared to values of intensity changes from the calibration map in order to provide a corrected value of displacement of the object that is recovered from the calibration map and processed so that absolute values of motion parameters of the object are determined.
-
Citations
6 Claims
-
1. A method for determining motion parameters of an object by way of at least one coil within a magnetic field adapted for a magnetic resonance based imaging device, the method which comprises:
-
emitting induced pulses on the coil in order to provide navigator signals that are finally measured in order to provide a spatial position of the object relative to the coil; generating at least one reference displacement of the object relative to the coil that is spatially and metrically predefined between two positions of the object, so that intensity changes of navigator signals at the coil are measured and recorded in a calibration map; for determining each one of a sequence of further positions of an object in motion relative to the coil, measuring a navigator signal of the coil and comparing to values of intensity changes from the calibration map in order to provide a corrected value of displacement of the object that is recovered from the calibration map and processed, to thereby determine absolute values of motion parameters of the object. - View Dependent Claims (2, 3, 4, 5, 6)
-
Specification