SPECT data is more difficult to correct for attenuation effects.
For situations in which attenuation effects are important the use of such simplification is unrealistic because D and H respond differently to changes in flow conditions.
Attenuation effects are more severe for coincidence imaging than for single-photon imaging.
The assumption is not valid when important attenuation effects are present as a result of, for example, vegetation resistance.
Figure 3 clearly shows a much faster loss of wetland vegetation when attenuation effects are considered.
Figure 1: Flow attenuation effects due to vegetation on a subtropical tidal flat.
For the LFP LFP coherence, the attenuation effect was weak.
The strength and time course of the attenuation effect was broadly similar for the different stimulus types (bars and gratings).
However, we corrected for this attenuation-effect.
A similar attenuation effect was observed histologically.
We saw similar magnitudes of effect modification for NO2, but the effect modification pattern was not statistically significant.
