Effect Of Various Parameters On Field Uniformity Corrections In Scintillation Cameras

Arthur J. Olch; L. Stephen Graham; J. Michael Uszler; F. Eugene Holly

doi:10.1117/12.7972639

Abstract

Many Anger scintillation cameras are equipped with microprocessors for live correction of field nonuniformities. The purpose of this study was to evaluate the corrected flood field uniformity after varying count rate, analyzer window size, analyzer window position, and scatter. A 2.54 cm thick Tc-99m disk source was used with large and small field Anger cameras under conditions simulating clinical usage. Uniformity was evaluated quantitatively by computing the location and percentage of cells in a 64X64 matrix that were within ±5% of the mean cell count; it was judged qualitatively by examination of the computer thresholded image. The corrected 2.54 cm thick Tc-99m disk flood image showed virtually no change in uniformity as scatter medium was increased from 0 cm to 8.9 cm. When count rate was varied from 5K to 44K cps as much as a 13% decrease in field uniformity was observed. Changing the analyzer window size produced a 5-21% decrease in uniformity while changing the window position resulted in even more significant image degradation. Knowledge of these camera characteristics is important in improving clinical images.

Citation Download Citation

Arthur J. Olch, Arthur J. Olch, L. Stephen Graham, L. Stephen Graham, J. Michael Uszler, J. Michael Uszler, F. Eugene Holly, F. Eugene Holly, } "Effect Of Various Parameters On Field Uniformity Corrections In Scintillation Cameras," Optical Engineering 19(6), 196932 (1 December 1980). https://doi.org/10.1117/12.7972639 . Submission:

ACCESS THE FULL ARTICLE

PERSONAL SIGN IN
Full access may be available with your subscription

Email or Username Forgot your username?

Password Forgot your password?

Show

Remember Email/Username on this computer

Remember Password

No SPIE account? Create an account
or Institutional Sign In via Shibboleth

PURCHASE THIS CONTENT

SUBSCRIBE TO DIGITAL LIBRARY

50 downloads per 1-year subscription

Members: $195

Non-members: $335 ADD TO CART

25 downloads per 1 - year subscription

Members: $145

Non-members: $250 ADD TO CART

PURCHASE SINGLE ARTICLE

Includes PDF, HTML & Video, when available

Members: $20.00

Non-members: $25.00 ADD TO CART

Keywords/Phrases

Search In:

Publication Years