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z Nuc Med z > PET FINAL practice test > Flashcards

PET FINAL practice test Flashcards

1
Q

Which of the following methods of localization are utilized by 18F-FDG?

A

Glucose metabolism

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2
Q

Detector crystals are “manipulated” to “simulate” the presence of thousands of individual crystals by __________.

A

etching cuts of differing depths across the crystal

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3
Q

The accelerated particles in a cyclotron are kept within the system due to the effects of the cyclotron’s ___________.

A

magnetic field

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4
Q

When comparing and contrasting PET and SPECT processing, __________.

A

PET and SPECT actually use very similar reconstruction techniques

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5
Q

For Pair Production to occur, the minimum energy of the incident photon must be at least __________.

A

1022 keV

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6
Q

Increasing the pitch of a CT scan, __________.

A

increases the couch speed

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7
Q

Which of the following is correct when comparing and contrasting the instrumentation required for PET versus that used in SPECT?

A

A PET camera’s complexity outweighs SPECT with hundreds of PMTs, thousands of crystals, and multiple computer analyses

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8
Q

Raw data in PET is collected in the form of __________.

A

a sinogram

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9
Q

The axial FOV describes __________.

A

the distance along the table that the PET scanner can image at one time

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10
Q

The energy (or penetrability) of x-rays can be adjusted by which of the following techniques?

A

kVp

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11
Q

The majority of x-rays produced by a tube are __________.

A

Bremsstrahlung x-rays

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12
Q

The minimum energy required for positron decay is __________ keV.

A

1022

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13
Q

The noise equivalent count rate and dead time in a PET system help to determine __________.

A

the maximum activity injectable/detectable

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14
Q

As the original positron energy increases, how is the final image resolution impacted?

A

FWHM gets wider (decreased resolution)

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15
Q

A typical value for a coincidence timing window is approximately __________ ns.

A

10

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16
Q

Which of the following is often formed shortly after a positron is emitted?

A

Positronium

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17
Q

One method to correct end plane noise is __________.

A

sinogram mashing

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18
Q

The half-life of F-18 is __________.

A

110 mins

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19
Q

The main disadvantage of having a larger number of detector rings is __________.

A

cost

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20
Q

The CT number for water is __________.

A

0

21
Q

What is the half-life of Rubidium-82?

A

1.25 minutes

75secs

22
Q

Deoxyglucose and glucose enter cells by the same transport enzyme and are both phosphorylated by the enzyme __________.

A

hexokinase

23
Q

Coincidence circuitry __________.

A

ensures less randoms are accepted

24
Q

The oil bath surrounding the x-ray tube __________.

A

keeps the tube cool during operation

25
Q

Which of the following tracers requires an on-site cyclotron for its production?

A

O-15 Water

26
Q

A PET camera is a __________.

A

scintillation detector

27
Q

PET scans are most often processed using which of the following methods?

A

OSEM

28
Q

Which term describes the line connecting two detectors processing a true event?

A

Line of Response

29
Q

A nuclide will decay by positron emission because __________.

A

it has too many protons

30
Q

_______ counts are the ones that contribute to our image, while ________ create the greatest loss of resolution.

A

True, randoms

31
Q

The target is removed after synthesis of 18F by __________.

A

purging the column using Neon gas

32
Q

Which isotope has the poorest image resolution?

A

Rb-82

33
Q

Which of the following methods of localization is utilized by 18F-AmyvidTM?

A

Binding to beta-amyloid plaque

34
Q

What is the half-life of N-13?

A

9.96 mins

35
Q

This processing method produces the best-looking images.

A

3D RAMLA

36
Q

Delayed timing window is used to correct for which of the following?

A

Randoms

37
Q

Which of the following is TRUE about scatter?

A

Scatter is not count rate dependent

38
Q

The main purpose of slip-ring technology is to __________.

A

allow for continuous rotation of the detectors and x-ray tube around the patient

39
Q

Which of the following is TRUE about sterility testing?

A

Separate samples are incubated at different temperatures for 14 days for observable bacterial growth

40
Q

Which of the following is TRUE about partial volume effect?

A
  • 3D blurring causes spillover between regions
  • Image of a small source is a larger but dimmer source
  • 3D image blurring introduced by the finite spatial resolution of the imaging system
41
Q

Fluorine, Carbon, Nitrogen, and Oxygen are commonly used in labeling PET agents because __________.

A

they are components of the naturally occurring organic materials found throughout the body

42
Q

kV refers to __________.

A

tube voltage

43
Q

Which of the following radiopharmaceuticals is produced by a generator?

A

Ga-68

44
Q

Bremsstrahlung x-rays are produced when the incoming electron __________.

A

Experiences a path change due to an interaction with the nucleus

45
Q

Which of the following is an initial precursor for producing 18F-FDG?

A

mannose triflate

46
Q

The source ion used in the production of 18F is the ___________.

A

proton

47
Q

Appearance
Radionuclide identity
pH
Chemical Purity

A

free particles
results between 105-115
results between 4.5-7.5
test depends on synthesis method used

48
Q

Which of the following is most responsible for the circular motion of the charged particles in the cyclotron?

A

Magnetic field

49
Q

Patient dose can be reduced by ___________.

A

Decreasing mAs

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