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Design and construction of a prototype rotation modulation collimator for near-field high-energy spectroscopic gamma imaging

Publication ,  Journal Article
Sharma, AC; Tourassi, GD; Kapadia, AJ; Harrawood, BP; Bender, JE; Crowell, AS; Kiser, MR; Howell, CR; Floyd, CE
Published in: IEEE Nuclear Science Symposium Conference Record
January 1, 2006

Neutron Stimulated Emission Computed Tomography (NSECT) is being developed for in vivo measurement of the concentration and location of biologically relevant elements. NSECT is a spectroscopic imaging technique whereby the body is illuminated via high-energy neutrons that excite elemental nuclei that then relax through characteristic gamma radiation. This imaging technique requires high-resolution spectroscopy, thereby eliminating the use conventional scintillation gamma cameras. Consequently, high-purity germanium (HPGe) semi-conductor detectors are utilized, providing no spatial information. To obtain 2D elemental concentration images, we are adapting high-energy solar spectroscopy technology. A rotating modulation collimator (RMC) consisting of two parallel-slat collimators is placed in front of the detector to modulate the incoming signal in a manner predicted by its geometry. Reconstruction of 2D images is feasible by counting the number of incident gammas at each rotation angle. The challenge is to identify a RMC geometry that allows this method to work in the near-field environment, which has far fewer assumptions and simplifications than the infinite focus of solar imaging. Herein we describe construction of a prototype RMC and experiments conducted with a radioactive 22Na point source. These experiments verified that the RMC modulates the signal in manner consistent with its geometric and physical properties. © 2006 IEEE.

Duke Scholars

Published In

IEEE Nuclear Science Symposium Conference Record

DOI

ISSN

1095-7863

Publication Date

January 1, 2006

Volume

4

Start / End Page

2021 / 2024
 

Citation

APA
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MLA
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Sharma, A. C., Tourassi, G. D., Kapadia, A. J., Harrawood, B. P., Bender, J. E., Crowell, A. S., … Floyd, C. E. (2006). Design and construction of a prototype rotation modulation collimator for near-field high-energy spectroscopic gamma imaging. IEEE Nuclear Science Symposium Conference Record, 4, 2021–2024. https://doi.org/10.1109/NSSMIC.2006.354310
Sharma, A. C., G. D. Tourassi, A. J. Kapadia, B. P. Harrawood, J. E. Bender, A. S. Crowell, M. R. Kiser, C. R. Howell, and C. E. Floyd. “Design and construction of a prototype rotation modulation collimator for near-field high-energy spectroscopic gamma imaging.” IEEE Nuclear Science Symposium Conference Record 4 (January 1, 2006): 2021–24. https://doi.org/10.1109/NSSMIC.2006.354310.
Sharma AC, Tourassi GD, Kapadia AJ, Harrawood BP, Bender JE, Crowell AS, et al. Design and construction of a prototype rotation modulation collimator for near-field high-energy spectroscopic gamma imaging. IEEE Nuclear Science Symposium Conference Record. 2006 Jan 1;4:2021–4.
Sharma, A. C., et al. “Design and construction of a prototype rotation modulation collimator for near-field high-energy spectroscopic gamma imaging.” IEEE Nuclear Science Symposium Conference Record, vol. 4, Jan. 2006, pp. 2021–24. Scopus, doi:10.1109/NSSMIC.2006.354310.
Sharma AC, Tourassi GD, Kapadia AJ, Harrawood BP, Bender JE, Crowell AS, Kiser MR, Howell CR, Floyd CE. Design and construction of a prototype rotation modulation collimator for near-field high-energy spectroscopic gamma imaging. IEEE Nuclear Science Symposium Conference Record. 2006 Jan 1;4:2021–2024.

Published In

IEEE Nuclear Science Symposium Conference Record

DOI

ISSN

1095-7863

Publication Date

January 1, 2006

Volume

4

Start / End Page

2021 / 2024