Neuroimaging Services Glossary
100 terms total — 24 showing — Last updated 15 Sep 2026
isotropic voxels
Three-dimensional image elements with equal dimensions in all spatial directions, enabling accurate volumetric measurements.
neurite orientation dispersion
Advanced diffusion MRI parameter that quantifies the angular variation of neurites within a voxel, providing microstruct...
neurofeedback protocol
A standardized procedure using real-time neuroimaging feedback to train patients to modulate their brain activity patter...
neuroplasticity mapping
The use of neuroimaging techniques to track changes in brain structure and function over time, particularly following in...
neurovascular coupling
The physiological relationship between neural activity and local cerebral blood flow changes that underlies functional n...
normalization
Spatial transformation process that aligns individual brain images to a standard anatomical template or coordinate syste...
Nyquist ghost
MRI artifact appearing as displaced duplicate image due to phase inconsistencies in EPI sequences.
PACS integration
Seamless connectivity between neuroimaging systems and Picture Archiving and Communication Systems for data management.
parallel imaging
MRI acceleration technique using multiple receiver coils to reduce scan time while maintaining image quality.
penumbra
In stroke imaging, brain tissue that is hypoperfused but not yet irreversibly damaged, representing potentially salvagea...
perfusion deficit
Abnormal reduction in cerebral blood flow detected through perfusion imaging techniques.
perfusion-weighted imaging
MRI technique that measures cerebral blood flow and volume, essential for assessing tissue viability in stroke and tumor...
perivascular spaces
Fluid-filled spaces surrounding blood vessels in the brain, appearing as punctate hyperintensities on T2-weighted images...
phase encoding direction
Spatial encoding axis in MRI that determines the direction of motion artifacts and distortion patterns.
phase unwrapping
A post-processing technique to remove 2π discontinuities in phase images, recovering true phase values across the image.
phase-contrast MRI
An MRI technique that measures tissue motion and flow by detecting phase shifts in the magnetic resonance signal.
post-contrast enhancement
Increased signal intensity in tissues following intravenous contrast agent administration.
preprocessing pipeline
Standardized sequence of computational steps applied to raw neuroimaging data before statistical analysis.
pseudocontinuous arterial spin labeling
An ASL technique using radiofrequency pulses to label arterial blood water as an endogenous tracer for cerebral perfusio...
radiological coordinate system
Standardized three-dimensional reference frame used for consistent anatomical localization and image orientation in neur...
radiology information system
Software platform managing neuroimaging workflow, scheduling, reporting, and data distribution.
radiomics
High-throughput extraction and analysis of quantitative imaging features to support clinical decision-making.
readout direction
Spatial axis along which MRI signal frequency encoding occurs during image acquisition, determining distortion character...
readout gradient
The magnetic field gradient applied during signal acquisition to spatially encode MRI data along the frequency-encoding...
resting-state network
Brain regions showing synchronized activity during task-free scanning periods.