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| Content Provider | IEEE Xplore Digital Library |
|---|---|
| Author | Ogawa, K. Kawamura, Y. Kubo, A. Ichihara, T. |
| Copyright Year | 1997 |
| Description | Author affiliation: Dept. of Electron. Inf., Hosei Univ., Tokyo, Japan (Ogawa, K.) |
| Abstract | Quantitative image reconstruction in single photon emission CT requires an accurate attenuation map of a cross section of an object. Several data acquisition geometries have been proposed to obtain the true attenuation map by means of gamma-ray transmission CT (TCT). In the transmission data scattered photons are sometimes measured and they reduce the accuracy of reconstructed TCT images. To investigate the effects of scattered photons in gamma-ray transmission CT, we performed Monte Carlo simulations for several types of data acquisition systems. Examined geometries were (a) a flood source and a parallel hole collimator, (b) a collimated flood source and a parallel hole collimator, (c) a line source and a symmetric fan beam collimator, and (d) a collimated line source and a symmetric fan beam collimator. The results showed that a fan beam collimator and a line source rejected most of the scattered photons generated inside an object, and that if we collimated emitted photons at the source side, almost all the scattered photons could be rejected at the collimator on the detector side. |
| Starting Page | 1411 |
| Ending Page | 1415 |
| File Size | 519719 |
| Page Count | 5 |
| File Format | |
| ISBN | 0780335341 |
| ISSN | 10823654 |
| DOI | 10.1109/NSSMIC.1996.591712 |
| 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 | Electromagnetic scattering Particle scattering Computed tomography Optical collimators Image reconstruction Attenuation Data acquisition Geometry Floods Object detection |
| Content Type | Text |
| Resource Type | Article |
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