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

Andy Welch; Grant T. Gullberg; Paul E. Christian; Jia Li; Benjamin M.W. Tsui

doi:10.1109/23.489437

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

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

Research output: Contribution to journal › Article › peer-review

3 Scopus citations

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 language	English (US)
Pages (from-to)	2331-2338
Number of pages	8
Journal	IEEE Transactions on Nuclear Science
Volume	42
Issue number	6
DOIs	https://doi.org/10.1109/23.489437
State	Published - Dec 1995
Externally published	Yes

ASJC Scopus subject areas

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

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@article{7d7637b9fd1945619a33bc0bb0af3dec,

title = "An Investigation of Dual Energy Transmission Measurements in Simultaneous Transmission Emission Imaging",

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.",

author = "Andy Welch and Gullberg, {Grant T.} and Christian, {Paul E.} and Jia Li and Tsui, {Benjamin M.W.}",

note = "Funding Information: Manuscript received November 15, 1994; revised August 10, 1995. This work was supported by NIH under Grant R01 HL 39792, and by Picker Intemational.",

year = "1995",

month = dec,

doi = "10.1109/23.489437",

language = "English (US)",

volume = "42",

pages = "2331--2338",

journal = "IEEE Transactions on Nuclear Science",

issn = "0018-9499",

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AU - Welch, Andy

AU - Gullberg, Grant T.

AU - Christian, Paul E.

AU - Li, Jia

AU - Tsui, Benjamin M.W.

N1 - Funding Information: Manuscript received November 15, 1994; revised August 10, 1995. This work was supported by NIH under Grant R01 HL 39792, and by Picker Intemational.

PY - 1995/12

Y1 - 1995/12

N2 - 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.

AB - 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.

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

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