AAPM - American Association of Physicists in Medicine
ABR - American Board of Radiology
ACR - American College of Radiology
ADCL - Accredited Dosimetry Calibration Laboratory
AFS - Automatic Field Sequencing
AMFPI - Active Matrix Flat Panel Imager
ANOVA - ANalysis Of VAriance
APS - American Physical Society
ARRA - Arizona Radiation Regulatory Agency
ASTRO - American Society for Therapeutic Radiology and Oncology
AVI - Advanced Visual Interface
AVM - ArterioVenous Malformation
Az - Area under curve (ROC)
BAT - B-mode Acquisition and Targeting (Nomos, Ultrasound positioning)
BED - Biological Equivalent Dose
BEV - Beams Eye View, Billion Electron Volts
BID - Bis In Die (Latin - twice a day)
BNCT - Boron Neutron Capture Therapy
BNCS - Boron Neutron Capture Synovectomy
AP - Anterior Posterior
CAC - Center for Advanced Computing
CAD - Computer Aided Diagnosis
CAMPEP - Commission on Accreditation of Medical Physics Education Programs
CAT - Computerized Axial Tomography
CGE - Cobalt Grey Equivalent
CI - Confidence Interval
CIAO - Complete Irradiation Area Outline
CMS - Centers for Medicare and medicaid Services
CNS - Central Nervous System
CR - Computed Radiography
CRS - Cut Reference System (UMPLAN)
CSI - Chemical Shift Imaging
CT - Computerized Tomography (CAT Scan)
CTDI - CT Dose Index
CTV - Clinical Tumor Volume (GTV <= CTV <= PTV)
DCIS - Ductal Carcinoma In Situ
DICOM - Digital Imaging and Communications in Medicine
DMLC - Dynamic Multi Leaf Collimation
DNR - Diffusion to Noise Ratio
DPM - Dose Planning Method
DRR - Digitally Reconstructed Radiograph
DRS - Dataset Reference System (UMPLAN)
DVH - Dose Volume Historgram
Dx - Diagnosis
EBT - Electron Beam Tomography
EGF - Epidermal Growth Factor
EGS - Electron Gamma Shower
EPID - Electronic Portal Imaging Device
EUD - Equivalent Uniform Dose
FDD - Field Depth Dose
FDG - Fluoro-Deoxy_Glucose
FISH - Fluorescence In Situ Hybridization
FOV - Field Of View
fMRI - functional Magnetic Resonance Imaging
GTV - Gross Tumor Volume (GTV <= CTV <= PTV)
GNU - Gnu is Not Unix
HD(Curve) - Hunter and Driffield (Film Dosimetry)
HDR - High Dose Rate
HIPAA - Health Insurance Portability and Accountability Act
HR - Hazard Ratio
HTML - Hyper Text Markup Language
HVL - Half Value Layer
Hx - Medical History
IAEA - International Atomic Energy Agency
ICRU - International Commission on Radiation Units
IDL - IsoDose Line
IGF - Insulin Growth Factor
IRB - Internal Review Board
IMRT - Intensity Modulated Radiation Therapy
JCAHO - Joint Commission on the Accredidation of Health Care Organizations
KPS - Karnofsky Performance Status
LAN - Local Area Network
LAO - Left Anterior Oblique
LCModel - Linear Combination of Model Spectra (MRS)
LDR - Low Dose Rate
LPO - Left Posterior Oblique
LTLF - Laser Target Localizer Frame
MCIT - Medical Center Information Technology
MeV - Million electron Volts
MFP - Mean Free Path
MHU - Millions of Heat Units (anode heating/cooling)
MIGA - Multiple Instance Geometry Approximation
MIRD - Medical Internal Radiation Dose
MIS - Mechanical Isocenter Standard
MLC - Multi Leaf Collimator
MPD - Mid Plane Depth
MRI - Magnetic Resonance Imaging
MST - Median Survival Time
MU - Monitor Units
MUT - Monitor Unit Time (from Co treatment)
MV - Mega Volts
NCI - National Cancer Institute
NCRP - National Council on Radiation Protection and Measurements
NFS - Neurological Function Score
NOS - Not Otherwise Specified
NRC - Nuclear Regulatory Commission
NSCLC - Non Small Cell Lung Cancer
NTCP - Normal Tissue Complication Probability
OAR - Organ At Risk, Off Axis Ratio
ODM - Opening Density Matrix
OR - Odds Ratio
PA - Posterior Anterior
PACS - Picture Archiving and Communications Systems
PDD - Percent Depth Dose
PET - Positron Emmission Tomography
PFS - Progression Free Survival
PFN - Pulse Forming Network
PPG - Program Project Grant
PSA - Patient Support Assembly, Prostate Specific Antigen
PTV - Planning Tumor Volume (GTV <= CTV <= PTV)
QA - Quality Assurance
QC - Quality Control
QID - Quater In Die (Latin - four times a day)
RAO - Right Anterior Oblique
rCBV - regional Cerebral Blood Volume
RECIST - Response Evaluation Criteria In Solid Tumors
RIT - RadioImmunoTherapy
RLPP - RectiLinear Phantom Pointer 
ROC - Receiver Operating Characteristics
RPC - Radiological Physics Center
RPO - Right Posterior Oblique
RSO - Radiation Safety Officer
RTF - Radiological Therapy Facilities
RTOG - Radiation Therapy and Oncology Group
RTP - Radiation Treatment Planning
RV - Record and Verify
Rx - Prescription
SAD - Source to Axis Distance
SBIR - Small Business Innovation Research
SDD - Source to Detector Distance
SEER - Surveillance Epidemiology and End Results
SF - Surviving Fraction
SFD - Source to Film Distance, Source to Focus Distance
SFOV - Scan Field Of View
SMPTE - Society of Motion Picture and Television Engineers
SNR - Signal to Noise Ratio
S/P - Status Post (e.g., s/p lumpectomy)
SPECT - Single Photon Emmission Computed Tomography
SRC - Scientific Review Committee
SRS - Stereotactic RadioSurgery
SSD - Source to Surface Distance
STTR - Small business Technology TRansfer
SWOG - SouthWest Oncology Group
SUV - Standard Uptake Value (unit-less number)
TAPO - TArget Positioner Overlay
TAR - Tissue Air Ratio
TBI - Total Body Irradiation
TCP - Tumor Control Probability
TCP/IP - Transmission Control Protocol/Internet Protocol
TD5/5 - Toxic Dose (5% after 5 years)
TG51 - Task Group 51
TID - Ter In Die (Latin - three times a day)
TLD - Thermo Luminescent Dosimeter
TLI - Total Lymph Irradiation
TMR - Tissue Maximum Ratio
TPR - Tissue Phantom Ratio
TRS - Treatment Reference System (UMPLAN)
TRUS - Trans Rectal Ultra Sound
TSET - Total Skin Electron Treatment
TUNEL - Terminal deoxynucleotidyl transferase biotin-dUtp Nick End Labeling
Tx - Treatment
VEGF - Vascular Endothelial Growth Factor
WAN - Wide Area Network