Enum: MRIContrastTypeEnum

MRI image contrast mechanisms

Permissible Values

Value	Meaning	Description
T1_WEIGHTED	NCIT:C180727	Image contrast based on T1 relaxation times
T2_WEIGHTED	NCIT:C180729	Image contrast based on T2 relaxation times
T2_STAR	NCIT:C156447	Image contrast sensitive to magnetic susceptibility
PROTON_DENSITY	NCIT:C170797	Image contrast based on hydrogen density
DIFFUSION_WEIGHTED	NCIT:C111116	Image contrast based on water diffusion
PERFUSION_WEIGHTED	mesh:D000098642	Image contrast based on blood flow dynamics

Slots

Name	Description
mri_contrast_type	MRI contrast mechanism

Identifier and Mapping Information

Schema Source

from schema: https://w3id.org/linkml/valuesets

LinkML Source

name: MRIContrastTypeEnum
description: MRI image contrast mechanisms
from_schema: https://w3id.org/linkml/valuesets
rank: 1000
permissible_values:
  T1_WEIGHTED:
    text: T1_WEIGHTED
    description: Image contrast based on T1 relaxation times
    meaning: NCIT:C180727
    annotations:
      tissue_contrast:
        tag: tissue_contrast
        value: gray matter darker than white matter
      typical_use:
        tag: typical_use
        value: anatomical structure
    title: T1-weighted contrast
    aliases:
    - T1-Weighted Magnetic Resonance Imaging
  T2_WEIGHTED:
    text: T2_WEIGHTED
    description: Image contrast based on T2 relaxation times
    meaning: NCIT:C180729
    annotations:
      tissue_contrast:
        tag: tissue_contrast
        value: CSF bright, gray matter brighter than white
      typical_use:
        tag: typical_use
        value: pathology detection
    title: T2-weighted contrast
    aliases:
    - T2-Weighted Magnetic Resonance Imaging
  T2_STAR:
    text: T2_STAR
    description: Image contrast sensitive to magnetic susceptibility
    meaning: NCIT:C156447
    annotations:
      sensitivity:
        tag: sensitivity
        value: blood, iron, air-tissue interfaces
      typical_use:
        tag: typical_use
        value: functional imaging, venography
    title: T2*-weighted contrast
    aliases:
    - T2 (Observed)-Weighted Imaging
  PROTON_DENSITY:
    text: PROTON_DENSITY
    description: Image contrast based on hydrogen density
    meaning: NCIT:C170797
    annotations:
      tissue_contrast:
        tag: tissue_contrast
        value: proportional to water content
      typical_use:
        tag: typical_use
        value: joint imaging, some brain pathology
    title: Proton density weighted
    aliases:
    - Proton Density MRI
  DIFFUSION_WEIGHTED:
    text: DIFFUSION_WEIGHTED
    description: Image contrast based on water diffusion
    meaning: NCIT:C111116
    annotations:
      sensitivity:
        tag: sensitivity
        value: molecular motion
      typical_use:
        tag: typical_use
        value: stroke, tumor cellularity
    title: Diffusion-weighted contrast
    aliases:
    - Diffusion Weighted Imaging
  PERFUSION_WEIGHTED:
    text: PERFUSION_WEIGHTED
    description: Image contrast based on blood flow dynamics
    meaning: mesh:D000098642
    annotations:
      measurement:
        tag: measurement
        value: cerebral blood flow/volume
      typical_use:
        tag: typical_use
        value: stroke, tumor vascularity
    title: Perfusion-weighted contrast