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 1):
A magnetic field adjustment device, at least comprising:\n a shim coil array that includes a plurality of shim coils for adjusting a static magnetic field in a magnetic field use area; a first calculation unit that determines current command values of the shim coils on the basis of eigenmodes which are obtained by singular value decomposition of a response matrix of currents flowing in the shim coils to a magnetic field; a power supply that controls the currents in the shim coils on the basis of the determined current command values; a second calculation unit that calculates correspondence between order terms which are obtained by expanding the static magnetic field in the magnetic field use area using a spherical surface harmonic function and strengths of the eigenmodes; and a display device that is connected to the second calculation unit and displays change of the static magnetic field in the magnetic field use area due to the shim coils supplied with the currents on the basis of the current command values as information on the order terms of the spherical surface harmonic function.

Metadata:
- Claim Count in Document: 5.0
- Percentile: 93.0
- Lexical Diversity: 2.0
- Patent Class: 324.0
- Transitional Phrase Type: open
- Component Type: 1
- Foreign Priority: True
- Related Applications: ['15549826', '15542493', '15122555', '15550160', '15541838']

Analysis Scores:
- 35 USC 101 Eligibility (BERT): 0.5452413531972483
- 35 USC 102 Novelty (BERT): 0.5054411662050189
- Combined Prediction Score: 0.5412613344980254
- Mean Citation Score: 258.275598
- Max Citation Score: 291.4992
- Similarity Product: 233.7536166049004

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