Measurements Using NMR Imaging Systems TRIZ Cases

A calibration unit calculates phase correction values from gradient echoes to adjust multidimensional radiofrequency excitation pulses.

Model-based estimation integrates gradient nonlinearity compensation directly into the magnetic resonance image reconstruction algorithm.

Segmented k-space acquisition using pre-dephasing gradient pulses suppresses Nyquist and acceleration artifacts in MRI.

Segmented MRF dictionary matching reduces processing time and memory storage by dividing large dictionaries into smaller sub-dictionaries, avoiding SVD truncation.

Odd/even slice ordering reduces crosstalk and magnetization transfer artifacts in multi-slice MRI.

Real-time frequency drift correction adjusts the center frequency based on calculated phase differences, preventing fat suppression errors in CEST imaging.

MRI slice grouping directs multiple channels to excite concurrent slice groups, resolving the trade-off between imaging quality and scan time.

Designing gradient waveforms with a frequency limit prevents hardware-induced trajectory deviations and reduces image artifacts.

Alternating flow compensation in interleaved echo planar imaging reduces scanning time while eliminating vein flow artifacts in susceptibility-weighted images.

Automated MRI main magnetic field correction using variable resonant frequency imaging sequences to estimate and pre-correct field uniformity.

Transforming Z-spectra into CPE spectra isolates CEST components from the dominating water baseline peak for accurate quantification.

Reconstructs separate fat and water images from k-space data acquired with consistent readout gradients.

Homogeneous phantom measurements correct pulse shape deviations to eliminate undesired slice selection and improve image resolution.

Grouping neighboring sub-volumes into distinct categories enables parallel excitation, reducing scan time while maintaining image resolution.

Varying coil currents and pulse parameters per slice corrects local field inhomogeneities, enhancing image quality.

Adiabatic pulse sequences encode relaxation times directly into signal amplitudes, correcting B1 field inhomogeneities while reducing acquisition complexity.

Optimized echo times and bipolar gradients shorten measurement time while maintaining signal quality for accurate water-fat separation.

Frequency swept excitation sequentially excites isochromats to enable near-zero echo time imaging.

A Dixon MR imaging method reconstructs phase images from multiple cardiac phases to separate water and fat signals.

A magnetic resonance system selects test positions from a preliminary image to record measurements in favorable regions.

A magnetic resonance imaging apparatus segments k-space data for controlled parallel imaging reconstruction using sensitivity distribution information.

A nonlinear fitted-phase basis function corrects residual phase in magnetic resonance imaging data.

Distributed samples and merged receiver units reduce device complexity while maintaining measurement precision in MRI systems.

Dynamic gradient amplitude modulation during excitation pulses suppresses fat signals in magnetic resonance imaging.

Processing circuitry compares segmented signal paths to locate RF coil abnormalities, eliminating phantom requirements and reducing troubleshooting time.

A variable-density spiral trajectory generates gradient waveforms to sub-sample magnetic resonance data.

Dynamic spectral filtering using a coherence function suppresses short-duration noise in magnetic resonance imaging signals, improving signal-to-noise ratio.

Detecting gradient coil thermal properties to adjust pulse timing, reducing examination pauses while managing heat accumulation.

A medical imaging controller updates base data from reference values to optimize sub-region settings during measurement sequences.

Radially-extending k-space sectors coordinate angiographic and perfusion imaging during a single contrast bolus, reducing total acquisition time.

A magnetic resonance control method selects parameters by measuring mean flip angles and extremal signal strengths.

A spatially non-uniform pre-saturation pulse adjusts flip angles across the imaging slice to enhance MRI signal contribution from flowing blood.

Aligning acquired MRI slices to a reference volume estimates subject motion, reducing image artifacts and scan duration.

A phase correction system aligns k-space lines using hybrid space conversion to resolve inconsistencies between readout polarities.

Magnetic resonance imaging apparatus executes pulse sequences to generate and decompose Z-spectra into Lorentzian components.

A shared open main magnet between adjacent rooms eliminates bulky magnetic field shields while separate gradient and RF coils maintain local field uniformity.

A virtual scanned object model enables one-click protocol selection in medical imaging systems.

A magnetic resonance image reconstruction method incorporates calibration data from a reference scan to separate simultaneously recorded slices.

Discrete gradient bursts minimize phase dispersion during radiofrequency signal detection, enabling faster imaging of rapidly decaying magnetic nanoparticles.

Digital lock-in sensing reduces microwave frequencies applied, enabling fast three-dimensional localization of failure points in stacked devices.

An MRI cable sensor detects electromagnetic interference signals, enabling digital subtraction of noise to reduce shielding complexity.

Combining multiple MRI images with distinct radio-frequency polarizations to reduce signal variations.

Blip-up and blip-down acquisitions enable joint least squares reconstruction to remove geometric distortions from off-resonance gradients.

Lookup table applies pre-calculated warp fields to correct cumulative EPI and MPG distortions, resolving the trade-off between correction speed and accuracy.

Automated range determination reduces manual planning time and minimizes spatial distortions in multi-station magnetic resonance imaging.

Subdividing modifiable time intervals into zero-moment and moment segments lowers acoustic noise and helium boil-off during MRI scans.

A magnetic resonance imaging apparatus segments time-series k-space data to calculate motion features for image reconstruction.

Integrated pulse sequences with optimized flip angles reduce spatial misregistration artifacts during single-slice liver imaging.

Time-shifted excitation pulses reduce specific absorption rate while maintaining measurement efficiency through precise phase alignment.

A segmented geometry method calculates local specific energy absorption rate using pre-determined electric parameters and mass density.