Acronyms Acronym Definition SSS  summed stress score  RAD  roentgen absorbed dose  ROI  region of interest  RVG  radionuclide ventriculography  RNA  radionuclide angiography  PIOPED  prospective investigation of pulmonary embolism diagnosis  PET  positron emission tomography  PIB  Pittsburgh compound B (2-[4´-(methylamino)phenyl]-6-hydrobenzothiazole)  OEF  oxygen extraction fraction  OIH  orthoiodohippurate  FET  O-(2-[18F]fluoroethyl)-L-tyrosine  MUGA  multigated acquisition  MMSE  mini-mental state examination  MCI  mild cognitive impairment  MHDP  methylene hydroxydiphosphonate  MDP  methylene diphosphonate  MIBI  methoxy isobutyl isonitrile  MIBG  meta-iodobenzylguanidine  MAG3  mercaptylacetyltriglycine  LHR  lung heart ratio  IMP  isopropyliodoamphetamine  IT  isomeric transitions  HDP  hydroxymethan diphosphonate  HAS  human serum albumin  HPLC  high-performance liquid chromatography  HMPAO  hexamethylpropyleneamine oxime  MRglc  glucose metabolic rate  GH  glucoheptonate  GDS  global deterioration scale  FDG  fluorine-18 2-fluoro-deoxyglucose  ENSDF  evaluated nuclear structure data file  EDTA  ethylene-diamine-tetra-acetic acid  L-ECD  ethylene dicysteine diethyl ester  ECD  ethyl cysteinate dimer  EHDP  ethane-1-hydroxy-1, 1-diphosphonate  DPM  disintegration per minute  DMSA  dimercaptosuccinic acid  DTPA  diethylenetriamine pentaacetic acid  CPM  count per minute  CMRO2  cerebral metabolic rate of oxygen  CMRglc  cerebral metabolic rate of glucose  CBV  cerebral blood volume  CBF  cerebral blood flow  MET  carbon-11 methionine  mHED  carbon-11 metahydroxyephedrine  HED  carbon-11 hydroxyephedrine  FMZ  carbon-11 flumazenil  AMT  carbon-11 alpha-methyl tryptophan  BGO  bismuth germinate  BMIPP  betamethyl-p-iodophenyl-pentadecanoic acid   1 of 2