Uniformity
How often is uniformity performed?
Daily
How often is a high count flood performed?
Weekly
How do we test reconstructed image uniformity?
With fillable phantoms
What is specific about the head size of a non-anger gamma camera?
Small detector heads
How do we test reconstructed image uniformity?
With fillable phantoms
Why is uniformity important?
Corrects for varying responses from the different PMT’s.
How many counts per pixel are acquired for a high count flood?
10,000
What do the rods in a Jaszczak phantom do?
Provides a 3D bar phantom
What are the two types of detector materials?
CsI(TI), CZT
What do the rods in a Jaszczak phantom do?
Provides a 3D bar phantom
Where is the artifact more intense on the FOV?
In the center and reduces in intensity at the periphery.
How many counts per second are acquired for a high count flood?
20,000
What 3 components make up the Jaszczak phantom?
Uniformity, spheres, rods
What are 3 types of imaging Non-Anger Gamma Cameras are used for?
Breast imaging, Tumor localization, Cardiac imaging
What 3 components make up the Jaszczak phantom?
Uniformity, spheres, rods
What are at least 3 defects that may show up through the reconstruction process?
Ring artifact, Arc artifact, Ray artifact, and motion artifact
How many counts should be acquired for a 64 x 64 matrix? What about a 128 x 128 matrix?
30-40 million
100-120 million
How often do we assess reconstructed image uniformity with a phantom?
Quarterly
What are the two types of collimators that Non-Anger Gamma Camera’s use?
Parallel Hole and Registered Collimator
How often do we assess reconstructed image uniformity with a phantom?
Quarterly
Why does the quality of SPECT images depend on the quality of individual images?
Imperfections in planar images are amplified during the reconstruction process.
What is the purpose of a high count flood?
To create a uniformity correction that is applied to later images
What do the rods and spheres in a phantom allow us to assess?
Resolution
What is specific about a non-anger gamma camera?
It has no PMT’s
What do the rods and spheres in a phantom allow us to assess?
Resolution