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| Content Provider | IEEE Xplore Digital Library |
|---|---|
| Author | Ferreira, N.C. Trebossen, R. Bendriem, B. |
| Copyright Year | 1997 |
| Description | Author affiliation: Service Hospitier Frederic Joliot, Orsay, France (Ferreira, N.C.) |
| Abstract | Using the Utah scatter phantom with different density media and activity proportions, we tested the accuracy of quantification in the 2D and 3D modes of acquisition of the new ECAT Exact HR/sup +/ tomograph. The influence of radioactive sources outside the Field Of View (FOV) was also investigated, using different bed positions. We measured the activities in regions of interest drawn in the reconstructed images and compared the mean through several planes to the activities expected from well counter measurements. The 3D scatter correction algorithm successfully restored the activity concentration in the various chambers of the phantom, with relative errors between 3.5 and 12.0%, slightly larger than those observed in 2D (1.3 to 8.6%), but similar when no activity was out of the FOV(/spl les/6.2%). The activity out of the FOV increased the relative errors and introduced nonuniformities along the axial direction. The attenuation coefficient of the substances tested also influenced the results: negative activity values were observed in substances with high attenuation coefficient in the 3D scatter corrected data. |
| Starting Page | 1343 |
| Ending Page | 1347 |
| File Size | 538094 |
| Page Count | 5 |
| File Format | |
| ISBN | 0780335341 |
| ISSN | 10823654 |
| DOI | 10.1109/NSSMIC.1996.591693 |
| Language | English |
| Publisher | Institute of Electrical and Electronics Engineers, Inc. (IEEE) |
| Publisher Date | 1996-11-02 |
| Publisher Place | USA |
| Access Restriction | Subscribed |
| Rights Holder | Institute of Electrical and Electronics Engineers, Inc. (IEEE) |
| Subject Keyword | Positron emission tomography Electromagnetic scattering Particle scattering Imaging phantoms Attenuation Testing Degradation Image reconstruction Counting circuits Image restoration |
| Content Type | Text |
| Resource Type | Article |
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