Cardiac SPECT and PET Instrumentation

Question 1

Higher system sensitivity implies higher image signal-to-noise and more efficient acquisition but with decreased spatial resolution. Okay

Answer 1

Depends on collimation parameters

Question 2

Anger camera

Answer 2

Lead collimators –> large crystal surface (NaI(Tl) crystal) –> PMT –> discrimination circuit

Question 3

Solid state detectors

Answer 3

Use cadmium-zinc telluride (CZT)

And cesium-iodide (CsI)

Question 4

High resolution collimators vs “general-purpose” or “all-purpose” collimators

Answer 4

Longer hole length
Smaller hole diameter
Thinner septa

Question 5

Filtered backprojection reconstruction (FBP)

Answer 5

Utilizes ramp filters that has the effect of minimizing the “rays that project outward from each point in the transverse image

Question 6

Iterative image reconstruction

Answer 6

Use a stepwise approach

Question 7

Crystals used for PET

Answer 7

BGO (bismuth germanate)

More recently, LSO (lutetium orthosilicate)