Question

If SPECT images taken with a 360d rotation, 32 stops for 15 s/stop, and matric of 64x64 have significant star artifact, which imaging parameter would be best to change and to correct the image?

a. change the rotation to 180d
b. change the number of stop to 64
c. change the time/stop to 20s
d. change the matrix to 128x128
e. none of the above

Answer 1

To correct the star artifact in SPECT images, changing the number of stops to 64 is the best imaging parameter.

Step-by-step explanation:

The star artifact in SPECT images can be corrected by changing the imaging parameter of number of stops. Currently, the images are taken with 32 stops. By increasing the number of stops to 64, the star artifact can be significantly reduced. The star artifact occurs due to insufficient sampling of the rotational angles during image acquisition, and increasing the number of stops provides more angular samples to create a more accurate image.

The other options, such as changing the rotation, time/stop, or matrix size, do not directly address the issue of star artifact in SPECT images. Changing the rotation to 180 degrees would result in incomplete image reconstruction and may introduce other artifacts. The time/stop and matrix size do not have a direct impact on the star artifact.