Method and apparatus for determining a system frequency in magnetic resonance imaging
AssigneeSiemens Aktiengesellschaft
InventorDaniel Niederloehner
Life of this patent
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Abstract
In a method, device and magnetic resonance (MR) system for determining a system frequency in MR imaging, a frequency spectrum of a region under examination is acquired. A cost function (FOM) is determined that encompasses the difference between a parameterized model function having assigned parameters that is to be optimized, and the acquired frequency spectrum. The cost function is subsequently minimized. Furthermore, the parameters of the optimized parameterized model function assigned to the determined minimum are determined and the system frequency is calculated on the basis of the determined parameters.
Claims15
A method for determining a system frequency for magnetic resonance (MR) imaging, comprising:
- operating an MR data acquisition unit to acquire a frequency spectrum of an examination region in the MR scanner;
- providing said frequency spectrum to a computer and, in said computer, automatically determining a cost function that represents a difference between a predetermined model function having assigned parameters, which is to be optimized, and the acquired frequency spectrum;
- in said computer, executing a minimization algorithm that minimizes said cost function;
- in said computer, executing an optimization algorithm that optimizes said model function, to obtain an optimized parameterized model function, and determining parameters of said optimized parameterized model function corresponding to the minimized cost function;
- and
- in said computer, using the determined parameters to determine said system frequency and emitting an electronic signal from said computer representing said system frequency.
A system frequency determination device for determining a system frequency in magnetic resonance (MR) imaging, comprising:
- a computer having an input interface that receives a frequency spectrum of an examination region in the MR scanner;
- said computer being configured to automatically determine a cost function that represents a difference between a predetermined model function having assigned parameters, which is to be optimized, and the acquired frequency spectrum;
- said computer being configured to execute a minimization algorithm that minimizes said cost function;
- said computer being configured to execute an optimization algorithm that optimizes said model function, to obtain an optimized parameterized model function, and determining parameters of said optimized parameterized model function corresponding to the minimized cost function;
- and
- said computer being configured to use the determined parameters to determine said system frequency and to emit an electronic signal from said computer representing said system frequency.
A magnetic resonance (MR) imaging apparatus comprising:
- an MR data acquisition scanner;
- a control computer configured to operate the MR data acquisition unit to acquire a frequency spectrum of an examination region in the MR scanner;
- said control computer being configured to automatically determine a cost function that represents a difference between a predetermined model function having assigned parameters, which is to be optimized, and the acquired frequency spectrum;
- said control computer being configured to execute a minimization algorithm that minimizes said cost function;
- said control computer being configured to execute an optimization algorithm that optimizes said model function, to obtain an optimized parameterized model function, and determining parameters of said, optimized parameterized model function corresponding to the minimized cost function;
- and
- said control computer being configured to use the determined parameters to determine said system frequency and to emit an electronic signal from said computer representing said system frequency.
A non-transitory, computer-readable data storage medium encoded with programming instructions, said storage medium being loaded into a control computer of a magnetic resonance (MR) apparatus, which comprises an MR data acquisition scanner, said programming instructions causing said control computer to:
- operate an MR data acquisition unit to acquire a frequency spectrum of an examination region in the MR scanner;
- automatically determine a cost function that represents a difference between a predetermined model function having assigned parameters, which is to be optimized, and the acquired frequency spectrum;
- execute a minimization algorithm that minimizes said cost function;
- execute an optimization algorithm that optimizes said model function, to obtain an optimized parameterized model function, and determining parameters of said optimized parameterized model function corresponding to the minimized cost function;
- and
- use the determined parameters to determine said system frequency and emit an electronic signal from said computer representing said system frequency.
Dependencies are inferred from the claim text.