Enum: MRIContrastTypeEnum

MRI image contrast mechanisms

Permissible Values

Value	Title	Meaning	Description	Measurement	Sensitivity	Tissue Contrast	Typical Use
T1_WEIGHTED	T1-weighted contrast	NCIT:C180727	Image contrast based on T1 relaxation times			gray matter darker than white matter	anatomical structure
T2_WEIGHTED	T2-weighted contrast	NCIT:C180729	Image contrast based on T2 relaxation times			CSF bright, gray matter brighter than white	pathology detection
T2_STAR	T2*-weighted contrast	NCIT:C156447	Image contrast sensitive to magnetic susceptibility		blood, iron, air-tissue interfaces		functional imaging, venography
PROTON_DENSITY	Proton density weighted	NCIT:C170797	Image contrast based on hydrogen density			proportional to water content	joint imaging, some brain pathology
DIFFUSION_WEIGHTED	Diffusion-weighted contrast	NCIT:C111116	Image contrast based on water diffusion		molecular motion		stroke, tumor cellularity
PERFUSION_WEIGHTED	Perfusion-weighted contrast	mesh:D000098642	Image contrast based on blood flow dynamics	cerebral blood flow/volume			stroke, tumor vascularity

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
instantiates:
- valuesets_meta:ValueSetEnumDefinition
description: MRI image contrast mechanisms
title: MRI Contrast Type
from_schema: https://w3id.org/linkml/valuesets
contributors:
- orcid:0000-0002-6601-2165
- https://github.com/anthropics/claude-code
status: DRAFT
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