SPECT

A source that is used for uniformity correction on a SPECT camera should have no more that how much variation in uniformity?

(+/-) 1%

How many counts should be acquired for a uniformity correction flood on a 128 x 128 matrix?

120 million

How many frames are required to evaluate an ejection fraction on a MUGA study?

16

SPECT data may be acquired in a continuous-motion orbit or a step-and-shoot method. The step-and-shoot method adds how much time per projection?

3-5 seconds

If arrhythmias reach __________ percent, it is generally advisable not to analyze the data.

30

If you go from a 64 x 64 matrix to a 128 x 128 matrix size, by what factor are you increasing the number of pixels?

4

A SPECT is set up to do a 360 degree rotation around a patient.The parameters are for 64 stops with 30 seconds per stop.What is the most likely matrix size that should be used?

64x64

If an image is acquired into a 64 x 64 matrix on a scintillation camera with a 496.26 mm diameter field of view, what are the dimensions of each pixel?

7.75

How many frames are acquired during a typical List Mode acquisition?

800-1200

Which reconstruction method typically demonstrates poor, artifact ridden images?

Backprojection

The primary benefit of SPECT is:

Improved contrast

What could you do as a technologist to help eliminate the star artifact seen on reconstructed SPECT images?

Increase the number of stops

Which of the following is not appropriate when setting up a MUGA acquisition?

Multi-crystal camera

What is the term used for the count profile of the rays that compose an image?

Projection

Pixel width determines which of the following?

Resolution

What is the reason that SPECT imaging significantly improves the image quality over planar imaging?

SPECT removes out of plane information

Which type of filter will eliminate noise from a gated study?

Spatial filter

The Jaszczak phantom tests for ___________________________ on a SPECT camera.

Spatial resolution

The ability of a system to distinguish two objects as separate objects is known as what?

Spatial resolution

The order of the butterworth filter controls what?

The point at which the slope hits the baseline

What is the name of the artifact you will receive when the center or rotation correction has not been done for a 180 degree rotation?

Tuning fork artifact

Iterative reconstruction algorithms require more time to process than FBP but produce

images with less noise