Measurements Using NMR Imaging Systems TRIZ Cases

A magnetic resonance imaging apparatus applies a second off-resonance radio frequency pulse to compensate phase shifts generated by a first pulse.

A local coil assembly integrates an electronic storage module and interface to exchange configuration files directly with the control computer.

Physics guidance and complementary sampling masks enable robust model training without fully-sampled ground truths, reducing scan times significantly.

A phase unwrapping system uses quality maps to filter echo signals and generate accurate MRI images.

Zigzag k-t sampling interleaves phase encoding lines across temporal dimensions, reconstructing multi-contrast images without B0 distortions or T2* blurring.

A volumetric fast spin-echo MRI system acquires multiple image contrasts from a single scan using variable repetition times and pseudo-random sampling.

A whole body RF coil combines a birdcage transmission element with microstrip reception antennas to enable parallel imaging.

A pre-scan pulse sequence acquires MR signals using a readout gradient and rewinder pulse to capture object projection and center frequency data simultaneously.

Chirped RF pulses encode spins via orthogonal gradients to acquire spatial data without Fourier transformation.

Multiband radio frequency pulses acquire multiple slices in one breath-hold, eliminating repeated holds that prolong scan time and reduce patient comfort.

Varying flip angles of refocusing pulses reduces specific absorption rate and measurement time while correcting metal artifacts in magnetic resonance imaging.

Variable interval sampling resolves parallel imaging contradictions by balancing high-speed data collection with preserved image quality.

A multiband RF excitation pulse selectively targets non-overlapping slices in magnetic resonance imaging.

Controlled flip angle modulation manages radio-frequency energy scattering in multislice magnetic resonance imaging.

Optimized radial k-space spoke selection forms closed trajectories for silent zero echo time magnetic resonance imaging.

A variable flip angle readout sequence modulates radio-frequency pulses to convert prepared longitudinal magnetization into accurate images.

A radial magnetic resonance data acquisition method restricts readout directions to a defined solid angle during image reconstruction.

Single-band binomial pulses excite fat protons while spoiler gradients dephase signals for spatial suppression.

Applying correction factors based on fat suppression signal bandwidth to accurate short T2 measurements and reduce tissue signal attenuation.

Iterative simulation and parameter adjustment of T2 preparatory radiofrequency pulse sequences reduce artifacts from magnetic field inhomogeneity.

Minimizing weighted magnetization norms via segmented transmit coils reduces sensitivity to B0 and B1 field inhomogeneities while maintaining high flip angles.

On-board memory stores calibration data to eliminate image artifacts and reduce system downtime during component replacement.

Artificial neural networks upscale low-resolution MR data to precise susceptibility maps, resolving partial volume effects at air-tissue interfaces.

Weighting navigator volume partial volumes differently during MR image acquisition to improve prospective motion correction accuracy.

A retrospective monoexponential fitting method generates high signal-to-noise ratio parameter maps from magnetic resonance signals.

A multiband RF refocusing pulse simultaneously targets multiple slice locations to increase coverage in reduced field of view magnetic resonance imaging.

A unipolar slab selection gradient pulse applied concurrently with an excitation signal reduces echo times in ultrashort echo time three-dimensional magnetic resonance imaging.

Randomly undersampled k-space reconstruction reduces scan time while maintaining spatial resolution in dynamic phase contrast MRI.

Radial fast interrupted steady-state MRI pulse sequence suppresses flow artifacts through periodic gradient application.

Dynamic current ratio adjustment based on real-time voltage gradients prevents excessive drops in active MRI gradient coil channels.

A multiple-echo projection pulse sequence measures T2* relaxation and apparent diffusion coefficient using hyperpolarized gas.

Segmenting the repetition time into distinct obtaining times allows sequential acquisition of multi-contrast MRI data without increasing system complexity.

Modifying gradient pulse shapes generates precise shim settings that compensate eddy currents, enhancing image quality despite manufacturing tolerances.

Modifying gradient pulse shapes via real-time parameter changes reduces acoustic noise while maintaining image acquisition speed.

Radial k-space sampling overcomes Cartesian undersampling limits, enabling high-quality non-contrast vascular imaging without cardiac gating.

An iterative algorithm processes K-space data to generate corrected signals that reduce motion artifacts in magnetic resonance imaging.

Segmented echo planar recording changes navigator sampling patterns to generate reference data without separate measurements.

Multiband pulse sequences simultaneously excite and refocus multiple slices to increase effective sampling time.

Dynamic parameter optimization improves T1 and T2 measurement precision by up to 90% while minimizing total imaging time.

Optimized gradient waveforms and 180-degree prep pulses reduce acoustic noise by 10 dBA while preserving T2 and FLAIR contrast.

Segmented radiofrequency pulses generate T1rho contrast while minimizing specific absorption rate deposition.

A magnetic resonance imaging apparatus varies interline intervals within blade-type radial sampling patterns to optimize k-space coverage density.

Thicker dummy slices placed outside main imaging areas minimize inflow effects, improving T1-weighted image quality.

An external shim directs magnetic fields beyond the bore to create a separate imaging area, reducing claustrophobia and increasing throughput.

Frequency sweep RF saturation pulses separate fat and water signals using varying frequency offsets.

Adjusting magnetic resonance control sequences using independent reference values for selective radiofrequency pulse excitation.

Combining alternating SSFP-FID and ECHO signals with z-shimming corrects field non-uniformities to measure R2, R2', and susceptibility.