An Investigation of Dual Energy Transmission Measurements in Simultaneous Transmission Emission Imaging

Andy Welch, Grant T. Gullberg, Paul E. Christian, Jia Li, Benjamin Tsui

Research output: Contribution to journalArticle

Abstract

In this study we investigate the feasibility of acquiring dual energy transmission projection data using a conventional gamma camera. Transmission projection data are acquired, simultaneously with 99mTc emission data, using the two major photopeaks of 153Gd, at 44 keV and 99 keV. The degree of contamination of the data in the 44 keV window, by scattered 99 keV transmission photons, is investigated using Monte Carlo simulations. A modified scaling method is proposed to convert the two attenuation maps, obtained from transmission data acquired at 44 keV and 99 keV, to one appropriate for 99mTc. This attenuation map is compared to one produced by scaling the 99 KeV attenuation map, for the attenuation correction of 99mTc SPECT images. The use of dual energy transmission imaging is shown to improve the quantitative accuracy of the reconstructed SPECT images compared to a single scale factor method. However, for situations where a dual scaling factor method is possible, this is shown to perform as well as the dual energy method. Dual energy transmission imaging is shown to be more effective at visualizing areas of bone, particularly in regions near the edge of the untruncated field of view.

Original languageEnglish (US)
Pages (from-to)2331-2338
Number of pages8
JournalIEEE Transactions on Nuclear Science
Volume42
Issue number6
DOIs
StatePublished - 1995
Externally publishedYes

Fingerprint

Imaging techniques
attenuation
scaling
projection
energy
photopeak
energy methods
data transmission
Data communication systems
bones
field of view
Bone
contamination
Contamination
Photons
Cameras
cameras
photons
simulation

ASJC Scopus subject areas

  • Nuclear Energy and Engineering
  • Electrical and Electronic Engineering
  • Nuclear and High Energy Physics

Cite this

An Investigation of Dual Energy Transmission Measurements in Simultaneous Transmission Emission Imaging. / Welch, Andy; Gullberg, Grant T.; Christian, Paul E.; Li, Jia; Tsui, Benjamin.

In: IEEE Transactions on Nuclear Science, Vol. 42, No. 6, 1995, p. 2331-2338.

Research output: Contribution to journalArticle

Welch, Andy ; Gullberg, Grant T. ; Christian, Paul E. ; Li, Jia ; Tsui, Benjamin. / An Investigation of Dual Energy Transmission Measurements in Simultaneous Transmission Emission Imaging. In: IEEE Transactions on Nuclear Science. 1995 ; Vol. 42, No. 6. pp. 2331-2338.
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