A scatter correction method for Tl-201 images: A Monte Carlo investigation

Author

Hademenos, George J. ; King, Michael A. ; Ljungberg, Michael ; Zubal, I. George ; Harrell, Charles R.

Author_Institution

univ. of Massachusetts Med. Center, Worcester, MA, USA

Volume

40

Issue

4

fYear

1993

fDate

8/1/1993 12:00:00 AM

Firstpage

1179

Lastpage

1186

Abstract

Results from the application of a modified dual photopeak window scatter correction method to Monte Carlo simulated Tl-201 emission images are presented. In the Monte Carlo investigation, individual simulations are performed for six radiation emissions of Tl-201. For each emission, point sources of Tl-201 are imaged at various locations in a water-filled elliptical tub phantom using three energy windows. The DPW method is applied to each point source image to estimate the scatter distribution. For point source images in both homogeneous and nonhomogeneous attenuating media, the application of this modified version of DPW results in an approximately sixfold reduction in the scatter fraction and an excellent agreement of the shape of the tails between the estimated scatter distribution and the Monte Carlo-simulated truth. This method is also applied to two views of an extended cardiac distribution within an anthropomorphic phantom, again resulting in at least a sixfold improvement between the scatter estimate and the Monte Carlo-simulated true scatter

Keywords

Monte Carlo methods; computerised tomography; medical image processing; patient diagnosis; radioisotope scanning and imaging; thallium; ²⁰¹Tl; Monte Carlo simulated Tl-201 emission images; anthropomorphic phantom; attenuating media; extended cardiac distribution; modified dual photopeak window scatter correction method; point source image; water-filled elliptical tub phantom; Biomedical imaging; Cancer; Imaging phantoms; Lakes; Medical diagnostic imaging; Medical simulation; Monte Carlo methods; Nuclear medicine; X-ray imaging; X-ray scattering;

fLanguage

English

Journal_Title

Nuclear Science, IEEE Transactions on

Publisher

ieee

ISSN

0018-9499

Type

jour

DOI

10.1109/23.256733

Filename

256733