Abstract
Fan-beam (FB) and cone beam (CB) collimators have been applied in SPECT due to their improved trade-off between spatial resolution and detection efficiency when compared with conventional parallel-hole (PH) collimators. This paper studies the detection efficiencies of these three collimator geometries in more realistic imaging situations. Theoretical formulations are derived for the detection for point and line sources placed in air and inside attenuating media with attenuation effect only. The effects of scatter are investigated using Monte Carlo simulation methods. For primary photons with and without attenuation effect, theoretical predictions agreed with the results from Monte Carlo simulations. The signal-to-noise ratios of the FB and CB are higher than that of the PH collimator and the differences increase with source depth.
| Original language | English (US) |
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| Pages | 1145-1149 |
| Number of pages | 5 |
| State | Published - 1995 |
| Externally published | Yes |
| Event | Proceedings of the 1994 Nuclear Science Symposium and Medical Imaging Conference. Part 1 (of 4) - Norfolk, VA, USA Duration: Oct 30 1994 → Nov 5 1994 |
Other
| Other | Proceedings of the 1994 Nuclear Science Symposium and Medical Imaging Conference. Part 1 (of 4) |
|---|---|
| City | Norfolk, VA, USA |
| Period | 10/30/94 → 11/5/94 |
ASJC Scopus subject areas
- Radiation
- Nuclear and High Energy Physics
- Radiology Nuclear Medicine and imaging