PATENT CLAIM ANALYSIS

Application Number: 15774339
Application Type: Utility
Filing Date: 2018-05
Publication Date: 2019-08
Patent Classification: ["324", "320000"]

Abstract:
To provide an operator with operability similar to that of conventional devices with an electromagnetic device that accurately maintains a magnetic field distribution by adjusting the magnetic field for each eigenmode obtained by singular value decomposition. The strength of a unique mode is found from a measurement magnetic field, a current for each unique mode of a negative feedback control according to the magnetic field is calculated and the current is added to each mode to obtain a current for each shim coil, and a coil current is controlled so as to reach the obtained current value. In an interface for an operator, a target for a corrected magnetic field and a magnetic field generated by a shim coil are displayed using a spherical surface harmonic function strength. Due to this configuration, a device which enables accurate magnetic field adjustment while offering operability similar to conventional devices can be provided.

Claim (Index 7):
The magnetic field adjustment device according to  claim 1 ,\n wherein the first calculation unit includes: an eigenmode strength calculating unit that calculates an eigenmode strength which is a strength of each eigenmode by an inner product with eigenmodes of singular value decomposition from measured magnetic field data of multiple points; a residual calculating unit that calculates residuals which are differences between the eigenmode strengths of the eigenmodes which are calculated by the eigenmode strength calculating unit and an eigenmode reference strength of the eigenmodes corresponding to a target magnetic field distribution; a current correction command value calculating unit that calculates a correction value of the current supplied to the shim coils in the eigenmodes by adding a coefficient which is determined on the basis of current distributions and singular values of the eigenmodes to the residuals of the eigenmodes and calculates correction command values of the currents supplied to the shim coils by summing correction values of the currents supplied to the shim coils in the eigenmodes for each shim coil; and a summing unit that sums the correction command values calculated by the current correction command value calculating unit and a reference current value and determines the current command values for the shim coils, and wherein negative feedback control is performed on a residual magnetic field.

Metadata:
- Claim Count in Document: 5.0
- Percentile: 93.0
- Lexical Diversity: 2.0
- Patent Class: 324.0
- Transitional Phrase Type: none
- Component Type: 0
- Foreign Priority: True
- Related Applications: ['15549826', '15542493', '15122555', '15550160', '15541838']

Analysis Scores:
- 35 USC 101 Eligibility (BERT): 0.5753290319655276
- 35 USC 102 Novelty (BERT): 0.5028331064992412
- Combined Prediction Score: 0.5680794394188989
- Mean Citation Score: 258.275598
- Max Citation Score: 291.4992
- Similarity Product: 256.64574772224427

Labels:
- Claim Label 101: 1
- Claim Label 102: 1
- Claim Label 103: 1
- Claim Label 112: 1
- Combined Label: 1
- Label 101 Adjusted: 1

Dataset: test