PET Instrumentation exam

Which reconstruction algorithm(s) used for PET reconstruction

a. filtered back projection

b. iterative reconstruction

c. attenuation correction

d. a and b

a and b

True or False: Absolute energy calibration allows the conversion of a patient scan into a representation of percent of injected dose per volume or gram of tissue

true

True or False: In PET imaging the FOV along the axis of the patient is approximately 50-100cm

false

a true count in PET is triggered by

the two gamma rays being detected within a certain time of one another

A 3d scanner

has increased random events

CT serves all of the following purposes for PET/CT EXCEPT

iodine contrast enhancement of metastatic tumors

This allows the conversion of a patient scan into a representative of percent injected dose per volume or gram of tissue (SUV’s)

absolute activity calibration

True or False: The top row of images represents the images in which attenuation correction has been applied (AC). The bottom row of images is the non-attenuated corrected (NOAC)

false

The two gamma photons generated form the annihilation reaction leave the point with the

same energy and in opposite directions

True or False: Technologists have a lower radiation exposure when working in PET

false

Attenuation correction in a PET/CT scanner is accomplished by

CT scan used for transmission

True or False: SPECT scanners have better spatial resolution than PET scanners

false

Which of the following PET QC procedures is necessary for computation of attenuation correction

blank scan

True or False: syringe shields used in PET/CT are made of lead

false

— is most effective in occupational protection form PET radionuclides

distance

When a positron radionuclide decays it leads to a —— being emitted

positron

The change detection of photons form unrelated annihilation events within the coincidence timing window is called

random coincidence

What is the best description of the collimation used with dedicated PET scanners

electronic

Thin lead or tungsten septa can be used to block angled photons. If septa are in place, the scanner is referred to as a

2D scanner

Correction are applied during PET reconstruction for which of the following

random events

true events

scatter

a and b

a and c

all of the above

a and c

A path of an annihilation photon pair determined by the electronic collimation and coincidence detection is known as what

line of response

True or False: Coincidence timing calibration adjusts amplifier gains from PMT’s

false

True or False: All position emitters have a total energy of 1.02 meV and when annihilation occurs emit two 511 gamma photons

true

Letter C in the image below represents what

scatter

Identify B in the image below

true coincidence detection