Fast estimation of scatter components with good accuracy by using OS-EM techniques for scatter subtraction

Zheng Liu; Takashi Obi; Masahiro Yamaguchi; Nagaaki Ohyama

doi:10.1117/12.349482

28 May 1999 Fast estimation of scatter components with good accuracy by using OS-EM techniques for scatter subtraction

Zheng Liu, Takashi Obi, Masahiro Yamaguchi, Nagaaki Ohyama

Author Affiliations +

Proceedings Volume 3659, Medical Imaging 1999: Physics of Medical Imaging; (1999) https://doi.org/10.1117/12.349482
Event: Medical Imaging '99, 1999, San Diego, CA, United States

Abstract

In this work, we propose a method for scatter compensation in SPECT imaging, by which we can estimate the scatter components in projections in high speed with a good accuracy. The method is that, at first, we estimate the scatter components in projections based on scatter response kernels by one time of OS-EM iteration, and then, subtract the estimated scatter components from the projections and complete the reconstruction by FBP method. The principle is that, the image corresponding to the scatter components in projections consist of almost low-frequency components of the activity distribution and the low-frequency components will converge faster than the high ones during iterative reconstruction. Therefore, we can estimate the low-frequency component image before the image converges with high-frequency ones and estimate the scatter components by re-projecting the low- frequency component image with scatter response kernels. The effects of the method were compared with dual- and triple- energy window methods using experimental measurements. The results show a good accuracy in estimated scatter components, a good uniformity of subtraction at both the center and side spheres and a good noise property can be acquired by proposed method compared with the dual- and triple-energy window methods.

Citation Download Citation

Zheng Liu, Takashi Obi, Masahiro Yamaguchi, and Nagaaki Ohyama "Fast estimation of scatter components with good accuracy by using OS-EM techniques for scatter subtraction", Proc. SPIE 3659, Medical Imaging 1999: Physics of Medical Imaging, (28 May 1999); https://doi.org/10.1117/12.349482

ACCESS THE FULL ARTICLE

INSTITUTIONAL
Select your institution to access the SPIE Digital Library.

SELECT YOUR INSTITUTION

PERSONAL
Sign in with your SPIE account to access your personal subscriptions or to use specific features such as save to my library, sign up for alerts, save searches, etc.

PERSONAL SIGN IN

No SPIE Account? Create one

;

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