18F	Fluorine-18
68Ga	Gallium-68
%IA	Percent injected activity
%IA/cc	Percent injected activity per cubic centimeter of tissue
%ID/cc	Percentage injected dose per cubic centimeter
% ID/g	Percentage injected dose per gram
αSMA	α-smooth muscle actin
AL	Systemic amyloid light chain
AL CA	Systemic amyloid light chain cardiac amyloidosis
ASUV	Average standardized uptake value
ASUVmax/B	Ratio of maximum average standardized uptake value to the background
ASUVmean/B	Ratio of mean average standardized uptake value to the background
CD	Crohn’s disease
CDAI	Crohn’s disease activity index
CDEIS	Crohn’s disease endoscopy index of severity
CMR	Cardiac magnetic resonance
CRP	C-reactive protein
CTE	Computed tomography enterography
DLCO	Diffusing capacity for carbon monoxide
DOTA-LM3	Dotatate-LM3
ESR	Erythrocyte sedimentation rate
FAP	Fibroblast activation protein
FAPi	Fibroblast activation protein inhibitor
FAPi PET/CT	Fibroblast activation protein inhibitor positron emission tomography/computed tomography
FAV	Fibrotic active volume
FCP	Fecal calprotectin
FDG	Fluoro- D-glucose
fILD	Fibrotic interstitial lung disease
FVC	Forced vital capacity
GGO	Ground-glass opacity
HR	High resolution
HRCT	High-resolution computed tomography
HSCs	Hepatic stellate cells
HU	Hounsfield unit
IBD	Inflammatory bowel disease
IgG4	Immunoglobulin G4
ILDs	Interstitial lung diseases
IMIDs	Immune-mediated inflammatory diseases
IPF	Idiopathic pulmonary fibrosis
LBR	Lesion-to-back ratio
LV	Left ventricle
LVV	Large vessel vasculitis
MAV	Metabolism activation volume
MDPI	Multidisciplinary Digital Publishing Institute
MPGN	Membranoproliferative glomerulonephritis
MRI	Magnetic resonance imaging
MSCs	Mesenchymal stroma cells
MTI	Magnetization transfer magnetic resonance imaging
MTR	Magnetization transfer ratio
PET/CT	Positron emission tomography/computed tomography
RT-qPCR	RT-qPCR: real-time quantitative PCR
SES-CD	Simple endoscopic score for Crohn’s disease
SSTR	Somatostatin receptor
SUV	Standardized uptake value
SUVmax	Maximum standardized uptake value
SUVmean	Mean standardized uptake value
TBR	Target to back ratio
TL	Total lesion
VOI	Volume of interest