Gain adjustment method and magnetic resonance imaging apparatus
AssigneeGE Medical Systems Global Technology Company, LLC
InventorsKasi Viswanathan Agilandam, Anasuya Mohan Rao
Life of this patent
Estimating the term…
Abstract
A method for adjusting a gain for reception of a magnetic resonance signal in a magnetic resonance imaging apparatus includes defining an initially set value of a slice thickness as slthick-original, defining a gain fit therefor as prescan-R1, and calculating a gain realtime-R1 fit for a changed value slthick-realtime of the slice thickness in accordance with: realtime-R1=(prescan-R1−(int)(log(slthick-realtime/slthick-original)+0.99)).
Claims12
A gain adjustment method, wherein in adjusting a gain for reception of a magnetic resonance signal in a magnetic resonance imaging apparatus, when an initially set value of a slice thickness is slthick-original, and a gain fit therefor is prescan-R1, a gain realtime-R1 fit for a changed value slthick-realtime of the slice thickness is represented as follows:
- realtime-R1=(prescan-R1−(int)(log(slthick-realtime/slthick-original)+0.99)).
A gain adjustment method, wherein in adjusting gain for reception of a magnetic resonance signal in a magnetic resonance imaging apparatus, when an initially set value of a field of view is FOV-original, and a gain fit therefor is prescan-R1, a gain realtime-R1 fit for a changed value FOV-realtime of the field of view is represented as follows:
- realtime-R1=(prescan-R1−(int)(log(FOV-realtime/FOV-original)+0.99)).
A magnetic resonance imaging apparatus having:
- an inducing device for applying a static magnetic field, a gradient magnetic field and an RF magnetic field to a target to be imaged to generate a magnetic resonance signal;
- a receiving device for receiving said generated magnetic resonance signal;
- an adjusting device for adjusting a gain of said receiving device;
- and
- a reconstructing device for reconstructing an image based on said received magnetic resonance signal,
- wherein said adjusting device comprises:
- a setting device for setting a slice thickness;
- a determining device for determining a gain fit for an initially set value of said slice thickness;
- and
- a calculating device for obtaining a gain realtime-R1 fit for a changed value slthick-realtime of the slice thickness by means of the following equation when an initially set value of said slice thickness is slthick-original, and a gain fit therefor is prescan-R1:
- realtime-R1=(prescan-R1−(int)(log(slthick-realtime/slthick-original)+0.99)).
A magnetic resonance imaging apparatus having:
- an inducing device for applying a static magnetic field, a gradient magnetic field and an RF magnetic field to a target to be imaged to generate a magnetic resonance signal;
- a receiving device for receiving said generated magnetic resonance signal;
- an adjusting device for adjusting a gain of said receiving device;
- and
- a reconstructing device for reconstructing an image based on said received magnetic resonance signal,
- wherein said adjusting device comprises:
- a setting device for setting a field of view;
- a determining device for determining a gain fit for an initially set value of said field of view, and
- a calculating device for obtaining a gain realtime-R1 fit for a changed value FOV-realtime of the field of view by means of the following equation when an initially set value of said field of view is FOV-original, and a gain fit therefor is prescan-R1:
- realtime-R1=(prescan-R1−(int)(log(FOV-realtime/FOV-original)+0.99)).
Dependencies are inferred from the claim text.