Attenuation map estimation with SPECT emission data only
نویسندگان
چکیده
منابع مشابه
Attenuation map estimation with SPECT emission data only
Quantitative SPECT can be well achieved if photon attenuation is taken into account in the reconstruction process. Using a transmission scan is a common approach. A dramatic simplification could be made if the attenuation map could be obtained from the emission data. In this paper, we propose a new method to estimate the attenuation map using the data consistency conditions of the attenuated Ra...
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A major step towards quantitative SPECT imaging may be achieved if attenuation, scatter and blurring effects are accounted for in the reconstruction process. Here we consider an approach which simultaneously estimates the unknown attenuation coefficient and the emission source using the emission data only. This leads to an inverse mathematical problem which could no longer be solved via iterati...
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Today, attenuation corrected SPECT, typically performed using CT or Gadolinium line source based transmission scans, is more and more becoming standard in many medical applications. Moreover, the information about the material density distribution provided by these scans is key for other artifact compensation approaches in advanced SPECT reconstruction. Major drawbacks of these approaches are t...
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Previously we developed algorithm to obtain transmission reconstructions from emission data without transmission measurements. The optimal basis set of “knowledge set” was used to create an approximate attenuation map, and the expansion coefficients were estimated using optimization algorithm. Since a truncated expansion does not represent an image precisely, the estimated coefficients can be u...
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ژورنال
عنوان ژورنال: International Journal of Imaging Systems and Technology
سال: 2009
ISSN: 0899-9457,1098-1098
DOI: 10.1002/ima.20200