Gamma Camera Glenda's Kahoot Flashcards
Which component of the gamma camera converts visible photons into amplified electronic pulses?
a. scintillator
b. collimator
c. amplifier
d. photomultiplier tubes
d. photomultiplier tubes
Which component of the gamma camera enables the origin of gamma rays to be located?
a. crystal
b. collimator
c. dynodes
d. sum circuit
b. collimator
which component of the gamma camera converts gamma photons into visible photons?
a. crystal
b. collimator
c. photomultipler tubes
d. light pipe
a. crystal
which statements is true about a patient with a gamma emitting tracer inside them?
a. only parallel gamma photons can pass through the patient
b. gamma photons are converted into visible photons in the patient
c. gamma photons are emitted in all directions
d. gamma photons are emitted in a parallel direction
c. gamma photons are emitted in all directions
what is the role of the collimator in NM imaging?
a. to focus the gamma photons to the crystal
b. to prevent photons not travelling at correction angle from reaching crystal
c. to magnify the object being imaged
d. to decrease the sensitivity of the imaging system
b. to prevent photons not travelling at correction angle from reaching crystal
what are the X and Y signals in NM imaging?
a. indicate the location of the PMT that created the greatest pulse
b. the coordinates of the collimator hole that gamma could pass through
c. where the gamma photons was emitted from the patient
d. where the gamma photons was absorbed in the crystal
d. where the gamma photons was absorbed in the crystal
How are X and Y signals determined?
a. by the amount of energy deposited in the crystal
b. by the location and output of the camera PMTs
c. through analysis by the division circuit
d. by the collimator determining where interactions will occur in the crystal
b. by the location and output of the camera PMTs
what is the z pulse?
a. the sum of all the PMT signals from a gamma interaction
b. the energy of the counting window
c. a signal providing positional information
d. the ratio of positional information to photon energy
a. the sum of all the PMT signals from a gamma interaction
Why is it important that position signals be normalized to the total energy of the event?
a. To increase statistial validity of the count
b. To ensure correct mapping of location of interaction
c. To improve image uniformity
d. For increased accuracy in pulse height analysis
b. To ensure correct mapping of location of interaction
Events that occur at or near the edge of the crystal are likely to be mispositioned. t/f
true
Which of the following collimators can be used to magnify the object in the image?
a. Converging
b. High Resolution
c. General All Purpose
d. Slant Hole
a. converging
Which of the following totals the output signals of all of the PMTs to create the Z pulse?
a. Position circuit
b. Sum circuit
c. Division circuit
d. Normalized circuit
b. sum circuit
Which of the following normalizes the X and Y signals in order to correctly position an event?
a. Sum circuit
b. Normalized circuit
c. Position circuit
d. Division circuit
d. division circuit
Which of the following uses multple PMTs and a capacitor or resistor matrix to locate the where the gamma interacted?
a. Position circuit
b. Sum circuit
c. Division circuit
d. Normalized circuit
a. position circuit
Which of the following components can be used to minimize the contribution of scatter to the image?
a. The scintillator
b. The photomultiplier tubes
c. The scaler
d. The pulse height analyzer
d. PHA
