SPECT MPI

Question 1

Step and shoot

Answer 1

32 or 64 stops for 180°

Or

64 or 128 stops for 360°

Question 2

Typically positioned supine, but prone can be used if

Answer 2

Pt is likely to have diaphragmatic attenuation

Question 3

How are ECG gating placed?

Answer 3

Standard lead II configuration

Question 4

Gated SPECT images allow the physician to assess

Answer 4

Wall motion
Wall thickening
Ejection fraction

Question 5

Suppress high frequency noise and result in smoothing off the image

Answer 5

Low pass filters

Question 6

Most commonly used low pass filter for MPI SPECT

Answer 6

Butterworth

Question 7

2 reconstruction techniques for planar images

Answer 7

Filtered back projection or iterative reconstruction

Question 8

What does butterworth filter do

Answer 8

Smoothing filter

Decreases high frequency noise and improves resolution

Question 9

Reconstruction that takes transraxial slices from the multiple projections acquired during acquisition and smears the counts back towards the center of the reconstruction space for the creation of each slice

Answer 9

Back projection

Question 10

What does unfiltered back projection create

Answer 10

Star artifact

Question 11

What filter must be applied to back projection reconstruction and why?

Answer 11

High pass ramp filter because back projection creates a star artifact

Question 12

What does a ramp filter do

Answer 12

Suppress low frequencies and enhance high frequencies

Results in sharper edges on images

Question 13

Reconstruction technique that involves estimation of the tracer distribution through a series of approximations until the desired result is obtained - more accurate reconstruction method

Answer 13

Iterative reconstruction

Question 14

Iterative reconstruction must be used if ___________ software will be applied to the data

Answer 14

Attenuation correction