Measurements Using NMR Imaging Systems TRIZ Cases

Temporally variable shim currents reduce field inhomogeneity, enabling simpler magnet designs that lower helium consumption and improve patient comfort.

Segmenting k-space acquisition by motion status reduces respiratory artifacts and cuts scan time without compromising diagnostic image quality.

An MRI apparatus generates local excitation pulse waveforms and sets imaging conditions to maintain specific absorption rate limits.

Cross-calibration reconstruction reduces third arm and foldover artifacts in parallel imaging by merging calibration data across parameter sets.

A controller interpolates shim coil current values from measured positions to adjust magnetic field homogeneity across the imaging space.

Sparse approximate encoding matrices accelerate Wave-CAIPI MRI reconstruction while low-rank modeling separates aliased signals to reduce noise.

Continuous volumetric navigator acquisition detects main magnetic field drift and updates shim coils in real-time to maintain image accuracy.

NMR sensors measure radiofrequency fields via proton samples, eliminating complex oscilloscope setups.

Computer system generates high-resolution 3D relaxation parameter maps using calibration curves derived from low-resolution reference scans.

A dynamic MRI method segments k-space data into basic and differential components to reconstruct images with high time resolution.

Multiband multishot magnetic resonance elastography achieves whole-brain coverage at 2x2x2 mm resolution in three minutes by correcting nonlinear motion errors.

Dividing the RF coil into overlapping units reduces weight and labor while maintaining signal sensitivity.

Digital receiver combines main and high-order signals into composite channels.

An adjustment computer modifies physical pulse sequence parameters to match stored reference tomography data.

A pattern recognition system compares measured MR signals with pre-calculated datasets to identify the best matching diffusion parameters.

Segmented RF refocusing pulses reduce specific absorption rate while maintaining signal-to-noise ratio in multi-slice MRI.

A dedicated radiofrequency coil captures high-resolution projection images of teeth using ultrashort echo time pulse sequences.

Pre-computed correction maps scale b-values to remove gradient nonlinearity errors from ADC measurements, reducing spatial bias below experimental uncertainty.

Time-reversed redundant spiral-in/out trajectories average opposing k-space samples to eliminate off-resonance blurring without increasing scan duration.

Segments k-space into rotated blades filled by separate echo trains, enabling robust motion correction without sacrificing T1-weighting.

Magnetic resonance imaging sequences use multiple signal acquisition modules to reconstruct target k-space data sets.

A scan condition determining apparatus adjusts MRI parameters to match desired scan times.

Synchronized navigator and image data acquisition corrects patient movement artifacts while reducing SAR exposure.

Asymmetric momentum space sampling acquires out-of-phase echo signals, reducing MRI measurement time while maintaining signal-to-noise ratio.

A magnetic resonance system adjusts phase coding steps based on slice position to acquire MR data.

Material-specific RF pulse sequences enable multi-parameter mapping, resolving scan time and quantification reliability trade-offs.

Integrating a shim conductor into the coil holder reduces device complexity while compensating residual magnetic field inhomogeneities.

Multi-echo MR imaging estimates eddy current phase errors via fitting procedures to correct B0 inhomogeneities without additional calibration scans.

Adapting slice selection gradient polarity to correct magnetic resonance imaging distortions near metal implants.

A recursive tree structure segments radial sampling into branches with uniform angles, resolving unequal spoke distribution.

An RF antenna integrates a frequency converter to shift signal bands away from the measured resonance.

Pre-scanning fluid, fat, and flow suppression removes background noise to boost signal-to-noise ratio without extending total scan time.

A magnetic resonance tomography scanner determines spatial variations in the static magnetic field to generate spectrally selective excitation pulses.

Stack-of-stars k-space ordering with M1-compensated gradients resolves signal loss from body motion during free-breathing acquisition.

Ultrashort echo time scan sequences prepare nuclear spins to acquire magnetic resonance data with minimal mechanical vibration.

Unequal readout gradient magnitudes enable spatially varying signal magnitude difference determination for MRI artifact reduction.

A multi-mode local-coil interface identifies coil types and adapts signal processing parameters automatically.

Processing circuitry estimates transmission and reception inhomogeneity from whole-body and surface coil signals to correct magnetic resonance images.

Dynamic main magnetic field strength variation expands the probed frequency range to reduce metal-induced distortion in MRI images.

Digital signal processing in MRI local coils reduces transmission bandwidth while maintaining signal-to-noise ratio and image quality.

A magnetic resonance fingerprinting method reduces signal waveform database size through hierarchical segmentation and representative subset selection.

Dynamic scaling adapts gradient coil actuation signals to match analog-to-digital converter input ranges.

Combining multiple diffusion model datasets reduces acquisition time while maintaining reconstruction accuracy.

A magnetic resonance imaging apparatus stores reception gains in a database to retrieve optimal amplification settings for subsequent scans.

Variable gradient pulse timing decouples diffusion encoding from echo time constraints in magnetic resonance imaging.

Segmented optimization minimizes reflected power in multi-channel RF transmitters, maintaining RF homogeneity and load independence.

Dual inversion recovery pulse sequences suppress the magnetization transfer effect, enabling accurate 4D non-contrast-enhanced arterial spin labeling.

Sequential slab acquisition maintains unsaturated fluid supply during 4D flow imaging.

Navigator echoes track gradient delays to correct echo phase information, reducing Nyquist ghost artifacts without increasing computational requirements.

A computer system reconstructs MR images using a forward model that simulates electromagnetic response physics via Maxwell's equations.