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content/analysis_11c-pbr28.html

@@ -238,8 +238,15 @@ However, in baboon studies correlation was poor
 cerebellum did not differ between healthy subjects and patients with Alzheimer's disease (AD), and 
 proposed using <a href="./model_ref_ratio.html">SUV ratio</a> (SUVR) from 60-90 min, with 
 cerebellum as pseudo-reference region. 
+
 <a href="https://doi.org/10.1186/s13550-016-0226-3">Nair et al (2016)</a> reported that the best 
 test-retest variability in AD study was obtained when using whole brain as the pseudo-reference.
+Whole brain has been used as reference to calculate SUVR maps from data range 60-90 min in several 
+brain studies
+(<a href="https://doi.org/10.1093/brain/awu377">Loggia et al., 2015</a>;
+<a href="https://doi.org/10.1016/j.nicl.2015.01.009">Zürcher et al., 2015</a>;
+<a href="https://doi.org/10.1038/s41380-019-0433-1">Albrecht et al., 2021</a>).
+
 <a href="https://doi.org/10.2967/jnumed.116.178335">Albrecht et al (2018)</a> proposed using 
 occipital cortex as pseudo-reference region in patients with chronic low back pain or ALS,
 and used it also in PET studies of fibromyalgia patients