Measurements Using NMR Imaging Systems TRIZ Cases

Pre-calculation of temporal control sequences prevents excessive excitations in interference frequencies, reducing scanning time losses.

Adjusting control pulse parameters via feedback compensates for non-linear amplifier gain, improving signal-to-noise ratio while limiting patient RF exposure.

Prospective gradient nonlinearity correction during image reconstruction reduces noise amplification and geometric distortion.

Acoustic feedback guides magnetic resonance tomograph coil tuning, eliminating trial-and-error delays and reducing service time.

Segmenting excitation volumes enables distinct shim currents and RF frequencies for each sub-area.

Preliminary calculation of second-order shimming values stabilizes correction fields before imaging acquisition, eliminating time delays during slice switching.

A processing device determines phantom fitting size from a three-dimensional image to correct MRI gradient sensitivity without precise positioning.

A magnetic resonance imaging apparatus extends the time interval between excitation and refocusing radio frequency pulses to manage gradient field transients.

Multi-directional spoiler gradients suppress unwanted coherence paths while minimizing required gradient moments.

Magnetic susceptibility tomography constructs voxel images from field strength differences using sensitive sensors and AC bias coils.

Unified pulse design eliminates ghosting artifacts while minimizing average local specific absorption rate through simultaneous power and SAR constraints.

Segmenting the imaging field into spatial-spectral bins allows selective excitation to reduce artifacts and track stainless-steel biopsy needles.

A magnetic resonance scan method adjusts field of view parameters using distortion maps to ascertain exclusion information for unmapped regions.

A treatment plan evaluation tool calculates quality indicators based on magnetic field homogeneity data.

This MRT receive apparatus reduces system cost and interference by shifting MR signals to an intermediate frequency via digital mixing before transmission.

Segmenting k-space into uniform and non-uniform regions reduces computational complexity while maintaining high-quality image reconstruction.

Separate filtering paths for magnitude and phase images preserve higher frequency components needed for accurate flow velocity calculation while removing noise.

Variable flip-angle T1 mapping sequence tracks cortical bone temperature changes during focused ultrasound application, preventing unintended skull injury.

Segmenting k-space sampling suppresses unfolding artifacts and reduces acquisition time in heterogeneous MRI systems.

A magnetic resonance measurement apparatus transfers high-density instruction sequences precedentially to a sequencer unit for immediate execution.

An MRI system adjusts RF signal energy and scan timing to maintain continuous imaging sessions.

A dynamic field camera measures magnetic field dynamics during spiral echo pulse trains to generate precise k-space trajectory models.

A multi-echo magnetic resonance gradient pulse parameter selection method determines readout and flyback parameters using a defined ratio of time difference to maximum gradient amplitude and rate-of-change.

A weighting matrix assigns lower signal intensity contributions to reception channels with high sensitivity during parallel imaging.

Segmenting signal acquisition periods into short time intervals enables geometric transformations that align image data across motion states.

Computational pulse design compensates for B0 inhomogeneity, reducing dark stripe artifacts and ensuring complete excitation.

A digital beamforming algorithm reconstructs parallel MRI images by weighting receiver signals with spatially-varying coefficients derived from RF element directivity.

A deep learning model reconstructs high-quality complex MRI images directly from incomplete partial Fourier k-space data.

Automated knee MRI overview scans guide diagnostic sequences, reducing examination time and motion artifacts while maintaining high image quality.

Repeated central k-space acquisition eliminates movement artifacts by prioritizing critical data segments during long volumetric scans.

Phase masks derived from multi-echo responses suppress long T2 fat signals, revealing short T2 bone structures without radiation.

Local excitation black blood imaging suppresses blood signals in a localized region to enable accurate arterial input function quantification.

A maximum likelihood framework reconstructs magnetic resonance fingerprinting data into tissue parameter maps.

Interleaved multi-slice acquisition eliminates rest periods between data acquisitions to reduce scan time while maintaining measurement precision.

Restriction spectrum imaging resolves overlapping diffusion processes by segmenting length scale information, enabling accurate biomarker identification.

A single continuous composite radio frequency pulse manipulates water and fat magnetization through optimized phase transitions.

A voltage sensor on the MRI feed line measures excitation pulse amplitude to regulate transmitter output.

Compressed sensing algorithms recover complete q-space data from partial acquisitions, reducing scan time while maintaining image resolution.

Frequency-dependent calibration values correct receiving antenna sensitivity profiles, eliminating scanning errors in non-Cartesian MRI trajectories.

Segmenting k-space entry into multiple passes with reduced gradient slew rates lowers vibration loads and acoustic noise while maintaining image quality.

GM-SWIFT reduces specific absorption rate by ninety percent and RF power by seventy percent while detecting ultra-short T2* signals.

A phase-sensitive inversion recovery MRI method separates water and fat signals using Dixon-type chemical shift encoding.

Spectrally designed RF pulses rotate spins to capture NMR signals, eliminating dark bands from B0 inhomogeneity.

Phase-modulated RF pulses integrate B1+ mapping with relaxation measurements, eliminating separate scans and reducing total acquisition time.

Controllers use cross-coil current signals to generate correction signals, reducing image artifacts in magnetic resonance systems.

Measures source analog outputs and adjusts digital control signals to ensure consistent performance across incompatible manufacturer hardware.

Frequency-selective RF intermediate pulses suppress fat signals and shorten imaging time in high-field MRI.

Integrating a subsampled sigma-delta converter into the RF antenna eliminates complex coaxial cabling and reduces power consumption in MR imaging systems.

Fat-insensitive field map calibration using magnetization transfer reduces phase errors and improves chemical species separation accuracy.

An MRI apparatus determines optimal excitation angles via pre-scan signals to adjust radio-frequency transmit power.