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QM Registry Ch. 15
Quality Assurance in Nuclear Medicine
Question | Answer |
---|---|
American College of Radiology | offers accreditation of NM depts and mandates that certain QA procedures be performed |
bioassay | laboratory determination of concentration of drug or other substance in specimen |
center of rotation | fulcrum, or pivot point, of tomographic equipment motion |
chemical impurity | presence of chemical or other substance that normally should not be present |
chi-square test | statistic test for association between observed data and expected data represented by frequencies |
chromatography | any one of several processes for separating and analyzing various gaseous or dissolved chemical materials |
count rate | measurement of activity of radioactive substance |
disintegrations per minute | measure of rate of ionizing emissions by radioactive substances |
dose calibrator | component in NM equipment for determining amount of radionuclide |
energy resolution | amount of variation in pulse size or spreading of spectrum produced by detector |
field uniformity | refers to even distribution of magnetic field strength in region of interest |
gamma camera | device used for image acquisition in many NM procedures |
gas-filled detector | category of radiation detector consisting of gas-filled chamber |
Geiger-Muller meters | survey meter used mainly for radiation protector purposes as survey instrument and area monitor |
hydrolyzed reduced technetium | type of technetium-99m used in radionuclide imaging |
molybdenum-99 | parent element of technetium-99m |
multichannel analyzer | specialized scintillation detector that can select specific energy levels for detection |
Nuclear Regulatory Commission | Federal agency that enforces radiation safety guidelines |
Occupational Safety and Health Administration | Federal agency that oversees workplace environment |
photomultiplier tube | device used in many radiation detector applications that converts low levels of light into electronic pulses |
photon | smallest quantity of electromagnetic energy |
photopeak | peak amplitude on oscilloscope display |
pixel size | size of picture element found in matrix of computer-generated image; the smaller the pixel size, the greater the spatial resolution |
positron emission tomography | imaging technique whereby positron-emitting radionuclide is administered to pt, and result is release of photons by an annihilation reaction |
pulse height analyzer | device that accepts or rejects electronic pulses according to their amplitude or energy |
radionuclide impurity | presence of other substance(s) in radiopharmaceutical for NM procedures |
scintillation crystal | sodium iodide crystal used in scintillation detectors |
scintillation detectors | radiation detector consisting of sodium iodide crystal coupled to photomultiplier tube |
single-photon emission CT | NM procedure that creates cross-sectional images |
spatial linearity | ability of gamma camera system to make linear image with straight lines corresponding to same straight lines of bar pattern OR amt of geometric distortion in image as affected by homogeneity of main magnetic field & linearity of magnetic field gradients |
spectrum | display of electromagnetic energy on basis of wavelength and frequency |
standardized uptake value | measure of FDG uptake, contrast and scatter/attenuation |
technetium-99m | isotope of technetium whose primary gamma ray has energy of 140 kiloelectron volts |
technetium-99m pertechnetate | radionuclide used in NM procedures that consists of technetium-99m |
The Joint Commission | private agency (formerly known as JCAHO) responsible for accreditation of healthcare system |
thermoluminescent dosimeter | type of radiation detector with crystals such as lithium fluoride that release light when heated that is proportional to amount of incident radiation |
uniformity correction flood | QC procedure for NM equipment |
sensitivity | QC procedure performed to determine gamma camera detector's ability to detect ionizing events that occur in NaI(T1) crystal |