How long do we keep records for a qc test on a dose calibrator?
What is 3 years
100
This test assesses the ability of a dose calibrator to provide a true measure of the activity of radionuclides of different gamma energies.
What is accuracy test
100
A scintillation spectrometer is also know as an ____ probe
What is uptake....it is also known as a scintillation well counting system
100
how often must survey meters be calibrated?
a.daily
b.before ea use
c.monthly
d.annually
What is annually
100
If there are size and shape changes of a flood image, there is a problem with...
What is X&Y
200
Name 2 sources used for testing constancy.
What is Co-57 and Cs-137
200
20mCi contained in a 1mL volume in a syringe and 20mCi in a 10mL volume in a glass vial may yield significantly different measurements when assayed in the same dose calibrator. To ascertain the error in measuring activity of varying volumes in a vial, what procedure may be used?
What is geometric variation
200
A scintillation spectrometer uses ____ _____ analysis to determine which pulses will be counted.
What is pulse height
200
A tech changes the collimator on a gamma camera from a low-energy all purpose collimator to a high-reso collimator. If the same number of counts is acquired, how will the acquisition time change when the high-reso collimator is used?
What is acquisition time will increase
200
A normal result for chi-square is between ____ and ____
What is 0.1 and 0.9
300
How often is linearity of activity performed?
What is quarterly
300
Correction factors should be calculated for any geometric variations causing measurements to vary by more than ____% from expected activity.
What is 10%
300
Voltage calibration, background check, and constancy should all be tested on a ____ basis.
What is daily
300
when a high activity of a radionuclide is used for a PET scan, image quality is degraded because:
a.deadtime decreased
b.random events increase
c.attenuation increases
d.noise increases
What is random events increases
300
How can you tell the difference between a PMT problem and contamination on a field flood image?
What is the background will be hot on the image with contamination
400
What happens if the constancy error is greater than 10%?
What is the instrument must be repaired or replaced
400
When is a geometry dependence test performed?
What is at installation
400
QC source for a well counter for constancy test
What is Cs-137
400
A uniformity problem on a liquid phantom will be seen as cold or hot?
What is cold
400
Uncorrected flood field nonuniformities cause _____ artifacts in the tomographic reconstruction.
a.irregular
b.dropout
c.circular
d.linear
What is circular
500
What test involves assaying a source with a relatively short half-life over a period of several days comparing the predicted and measured results. The starting activity should approximate the highest activity that will be administered to a patient.
What is Linearity of activity
500
All tests should be performed at _____, _____, and ______. (name at least 2)
What is at installation, after adjustment, and after repair
500
The chi square test is used for testing _____
What is precision.....random errors affect the reproducibility(or precision) of measurements. These are always present in radiation counting because of the random nature of radioactive decay.
500
If an improper setting of the pulse height analyzer is set too high the PMT will look cold or hot?
What is cold
500
Barreling and pincushion are defects that happen to ____ floods.