CTStudy
type: DefinedTerm
description: CT/DICOM imaging study used for technical quantitative analysis.

ROI
type: DefinedTerm
description: Region of interest used for quantitative attenuation extraction.

VertebralAttenuation
type: DefinedTerm
description: Quantitative attenuation analysis of vertebral bodies.
derived from: CTStudy

LiverAttenuation
type: DefinedTerm
description: Quantitative attenuation analysis of hepatic parenchyma.
derived from: CTStudy

L1_HU
type: DefinedTerm
description: Mean trabecular attenuation in the L1 vertebral body.
is measurement of: VertebralAttenuation

LIVER_HU
type: DefinedTerm
description: Mean attenuation in hepatic parenchymal ROI.
is measurement of: LiverAttenuation

RSIF
type: DefinedTerm
description: ResetRay Structured Imaging Format.
represents: CTStudy