NMCTB : Instrumentation Operations and QC Practice Questions
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30 Terms
The dead time or resolving time of the Geiger tube refers to the time during which :
no radiation is detected
3 multiple choice options
Which of the following is correct about this image?
This is an ionization chamber
3 multiple choice options
What would be the correct reading if the needle is pointing to 0.8 and the meter is set to X 0.1?
0.08
3 multiple choice options
A dose calibrator is being tested for accuracy. The expected reading is 75 uCi. The dose calibrator reads 68 uCi. What should the technologist do?
Document this value, it is a passing result
3 multiple choice options
Which of the following sources should NOT be used for a constancy test?
I-123
3 multiple choice options
Accuracy determines if your dose calibrator can find the true value. What does constancy test?
Precision
3 multiple choice options
A geometry test was performed. The expected reading was 2.95 mCi. The actual reading was 2.45 mCi. What correction factor should be applied?
1.2
3 multiple choice options
A linearity test on a dose calibrator should be performed using the highest activity that will be used in the department. How long should it be carried out if using Tc-99m?
Until it reaches 30 uCi
3 multiple choice options
What is the cause of the peak being out of the window in c, d, and f?
The high voltage has drifted
3 multiple choice options
Your well counter has an efficiency of 85%. You count a wipe and get 120 cpm with a background of 2. How do you report this result?
139 dpm
3 multiple choice options
A 0.2 uCi Cs-137 stick is calculated to be 7,400 Becquerels. Cs-137 has an 85% abundance at 662 keV. The well counter reads the stick as 158,000 cpm. What is the well counter efficiency?
42%
3 multiple choice options
What is the purpose of a collimator on a gamma camera?
To absorb photons enerting at an angle
3 multiple choice options
A four-quadrant bar phantom is used for spatial resolution and what other quality control test?
Linearity
3 multiple choice options
How many counts should be collected in a daily uniformity test?
5-15 million
3 multiple choice options
An integral uniformity test is performed on a daily flood. The maximum pixel count was 7498 and the minimum pixel count was 7216. What is the integral uniformity?
1.92%
3 multiple choice options
A line source is being used to evaluate spatial resolution. How would the graph be used to quantify the spatial resolution of the camera?
the FWHM
3 multiple choice options
This phantom can evaluate each of the following EXCEPT?
Linearity
3 multiple choice options
A small petri dish of activity placed on the camera has 83 cps/MBq. What is being evaluated?
Sensitivty
3 multiple choice options
How many pixels are in a 64×64 matrix?
4096
3 multiple choice options
An energy resolution test using Tc-99m is being conducted on a gamma camera. The FWHM is 17. What is the percent energy resolution?
12%
3 multiple choice options
If your FOV is 380 mm, what are the size of your pixels if you are using a 128x128 matrix?
2.97 mm
3 multiple choice options
You want to collect 3,000,000 in your SPECT study. Your count rate is 200,000 cpm. You have a single head camera and plan to do 64 stops. How many seconds per stop are needed?
14 seconds
3 multiple choice options
What type of coincidence is depicted below?
Scatter
3 multiple choice options
What are two sources of error in PET imaging that we cannot correct for?
Non-colinearity and Randoms
3 multiple choice options
A Co-57 source is going to be used for an accuracy test. One year ago, it had 2.5 mCi. What is the expected activity today?
0.98 mCi
3 multiple choice options
Why is Cs-137 used for constancy and accuracy testing?
It has a long half life
3 multiple choice options
According to nationally recognized standards, how often should a dose calibrator undergo linearity testing (in addition to installation and after repairs)?
Quarterly
3 multiple choice options
A linearity test can be performed using time (decay). What other method can be used in a linearity test?
Shielding
3 multiple choice options
This image is useful in identifying motion. What is this image called?
Sinogram
3 multiple choice options
Which of the following converts light into electrons?
Photocathode
3 multiple choice options