Measurements Using NMR Imaging Systems TRIZ Cases

Dynamic MRF sequences vary RF and gradient parameters to eliminate repetitive vibrations, reducing loud noises while maintaining diagnostic image quality.

Through-time GRAPPA acquires partitioned non-Cartesian calibration data using varying gradient encoding to reconstruct high-resolution images.

Switches between whole-body and specified reception coils during echo acquisition to calculate sensitivity distribution.

Shorter central k-space acquisition periods reduce audible noise while outer region timing preserves image contrast.

Kalman filtering reduces aliasing and temporal blurring during free breathing for real-time cardiac imaging.

A magnetic resonance imaging apparatus compares dummy echo signals across shots to identify motion-related data for exclusion from image reconstruction.

Multispectral MRI data reconstruction interpolates missing phase encoding points using spectral correlations, resolving image artifacts near metal implants.

Segmenting SMS turbo spin echo echo trains to evolve magnetization for different contrasts reduces dead time and improves measurement efficiency.

Replacing single refocusing pulses with adiabatic pairs increases bandwidth by over 70%, reducing off-resonance artifacts and chemical-shift misregistration.

Adapting gradient pulse slew rates to hardware limits reduces noise and energy consumption while maintaining spatial encoding precision.

Pseudorandom phase radio frequency pulses enable high steady state transverse magnetization in magnetic resonance imaging systems.

Coordinate transformation maps physical axis gradient waveforms to logical axis signals, reducing repetition time and echo time during oblique scanning.

Alternating single-band and multi-band excitations acquire multiple contrasts within a single scanning sequence.

Alternating read-out gradients generate consistent reference data, eliminating image ghosts and wrap-around artifacts while shortening measurement time.

Real-time shimming data reacquisition corrects magnetic field non-uniformity caused by object movement, preserving MR image quality.

A magnetic resonance apparatus derives reference data from a preliminary calibration scan to support accelerated imaging with rotated gradient directions.

Uses asymmetric gradient activity to reduce eddy current artifacts and eliminate rewinding gradients during fat-water separation.

Generative adversarial networks replace physics simulations to generate accurate MRF dictionaries in seconds instead of days.

A control computer dynamically adjusts center frequency and RF pulse waveforms for each sub-volume during magnetic resonance data acquisition.

Central k-space references enable precise in-plane and through-plane motion correction, reducing artifacts while maintaining sampling density.

Segments k-space matrices to apply varying diffusion weightings, resolving the trade-off between measurement precision and acquisition time.

Frequency range segmentation isolates liver fat signals from interfering substances like iron, enabling accurate hepatic steatosis diagnosis.

A free-breathing stack-of-radial MRI protocol employs self-gating signals to extract respiratory motion states from gradient-delay-corrected radial readout views.

Swept radio frequency pulses encode magnetic resonance signals via phase gradients, reducing peak power demands in inhomogeneous B0 fields.

A convolutional filter processes k-space datasets to enhance signal-to-noise ratio in magnetic resonance imaging.

Multiple velocity selective saturation modules improve SNR by re-saturating blood during relaxation, resolving low tagging efficiency.

A Bloch-Siegert scaling factor corrects excitation magnetic field non-uniformity.

Zero echo time pulse sequences acquire volumetric data using unshielded gradient coils for cost-effective magnetic resonance imaging.

Complementary k-space sampling reduces readout duration while preserving image resolution, addressing trade-offs in low-field MRI.

Implicit GROG kernels estimate Cartesian coordinates from non-Cartesian samples, reducing noise amplification and reconstruction artifacts.

A system analyzes MRI acquisition parameters to dynamically adjust image display arrangements and optimize reading workflows.

Flexible echo times in modified Dixon sequences reduce data acquisition time and avoid signal cancellations to enhance attenuation map accuracy.

Segmenting sequences into event blocks enables real-time GIRF correction without offline processing delays.

Segmenting large gradient areas into small intervals eliminates T2* decay limits and gradient dephasing during high-amplitude MRI measurements.

Random k-space sampling reduces acquisition time while compressed sensing algorithms reconstruct artifact-free images from undersampled data.

A processing method separates positive and negative susceptibility contributions in MRI voxels using distinct frequency shift equations.

Multi-echo imaging sequences acquire radial k-space profiles with varied relaxation time weightings to eliminate contrast contamination from long echo trains.

Phase modulation in gradient echo sequences enables single-acquisition T2 mapping, reducing motion artifacts and acquisition time.

Optical paths transmit clock signals into shielded cabins to generate precise electrical timing for positron emission tomography detectors.

A radiation particle detector determines scintillation event positions using photosensor triggering probabilities and photon distribution likelihoods.

Spiral k-space spokes with golden angle offsets enable self-navigation and compressed sensing to resolve dynamic movement artifacts without external navigators.

Increasing gradient strength in edge regions shortens slice-selection time periods while maintaining correction phases for simultaneous multislice acquisition.

Magnetic resonance fingerprinting estimates perfusion parameters simultaneously, reducing scan time and contrast agent toxicity risks.

Asymmetrical readout gradients in CPMG TSE Dixon sequences increase maximum readout moments, resolving motion sensitivity and prolonged scan times.

An MRI apparatus determines multi-slice collection direction based on static magnetic field distribution.

Block-wise Hankel tensor completion reconstructs multi-slice MRI data using complementary sampling schemes.

A gradient magnetic field power supply device distributes electric power to coil channels based on specific requirements.

Interrupted 3D single-shot unbalanced steady-state free precession pulse sequence synchronizes with cardiac cycles to acquire MR data.

Varying flip angles across simultaneous slices prevent RF power amplifier overload and pulse-clipping during MR fingerprinting data acquisition.