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WorksheetsIMPCB - Nuclear Medical Physics
Total questions: 20
Worksheet time: 40mins
What scintillation camera acquisition mode stores counts sequentially with x,y coordinates and time markers?
Cartesian Mode
List Mode
Cine Mode
Frame Mode
Below is an image and profile of a uniform intensity SPECT phantom. Why does the phantom not appear uniform?
A bowtie filter was used
There is no attenuation correction
A bowtie filter was not used
An insufficient number of projections were used
Which of the following will not decrease collimator blurring in SPECT imaging?
Decreasing septal thickness
Increasing collimator hole length
Decreasing collimator hole diameter
Which of the following is not a SPECT acquisition parameter?
Time of flight window
Time per projection
Degrees per step and stop
Degrees of rotation
What is the energy of a Tc-99m photon?
58 keV
1.25 MeV
140 keV
511 keV
What do PET scanners detect?
Protons emitted after positron decay in regions of high uptake
NaI(Tl) scintillation events
Annihilation photons
Positrons emitted from radiolabeled biologically available chemicals such as FDG
PET crystals are often thicker and denser than those used in gamma cameras. Why is this?
PET annihilation photons are higher energy than the photons detected via gamma camera
Large crystals improve geometric efficiency
PET uses time of flight information to determine point of photon emission. Therefore a small detector is unnecessary
PET reconstruction requires much higher collection efficiency
F-18 decays with a maximum positron energy of 0.63MeV and O-15 decays with a maximum positron energy of 1.74MeV. Which radionuclide provides the greater uptake localization accuracy?
F-18
The solution depends on the carrier molecule
O-15
Both produce the same error
A patient preparing for a PET study has been advised by a friend, a local physics teacher, to remove his clothes during his PET scan. What effect would this have on the scan?
Improve SNR
No impact on scan
Decrease scan time
Improve spatial resolution
Why do PET/CT devices include the CT component?
CT imaging requires the same physical hardware at PET, so the marginal cost of a combined system is very low
The linear attenuation coefficient data can be used to create a more accurate PET image
PET images cannot be generated without the filtered back projection data provided by a CT
This allows for direct use of the PET/CT in treatment planning
Which of the following is not a method of medical radioisotope production?
Separation from spend reactor fuel rods
Elusion of a metastable daughter from a parent nuclide
Neutron bombardment in a cyclotron
Bombarding with neutrons in a reactor
A radiopharmaceutical has a biological half life of 74 minutes and an effective half life of 44 minutes. What radionuclide is used?
F-18: t1/2 = 109.8 minutes
Ga-68: t1/2 = 68.3 minutes
C-11: t1/2 = 20.4 minutes
O-15: t1/2 = 2.0 minutes
The term Moly Cow refers to what?
Mo-99 flood correction factor
A shielded radiation waste storage device
Molybdenum-99 based radiotracers commonly used in GI studies
A hospital based Tc-99m generator
Find the biological half life an I-125 molecule with an effective biological half life of 55 days
3.2 years
2.0 years
318 days
571 days
What is the half-life of F-18?
10 minutes
20 minutes
110 minutes
2 minutes
True or False: For the same administered activity, F-18 administration will result in more dose to the patient than O-15. Ignore biological half-life.
False, integral dose is not influenced by half-life
True, 18F's longer half life will result in higher integral dose for the same initial activity
False, 18F's longer half life will result in lower integral dose for the same initial activity
False, 18F's shorter half life will result in lower integral dose for the same initial activity
True, 18F's shorter half life will result in higher integral dose for the same initial activity.
A dose calibrator uses what type of detector?
Proportional counter
NaI scintillator
Well-type ionization chamber
Fluke 481 meter
The (n, γ) reaction yields a ____ of the parent atom
Isobar
Isotone
Isomer
Isotope
Which parameter does not impact geometric efficiency of a counting study?
Sample placement
Sample volume
Sample container
Sample activity
Why does the accuracy of a well counter decline for measurement of very high activity samples?
Coincidence loss
Geometric inefficiency increases
Accuracy is not effected by sample activity
Sample self attenuation
