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Tracer injection as a bolus is the standard procedure in (preclinical) PET (Carson, 2000). Our results suggest that radiotracer infusion may be beneficial for detecting BBB leakage during epileptogenesis not only in MRI but in nuclear medicine techniques, too. Furthermore, a slower but longer lasting application as in infusion vs.

bolus provides a lesser impact on the brains endothelium. It may be taken into consideration that a quickly administration of a volume which is high in relation to the

bodyweight may per se influence BBB integrity (Nagaraja et al., 2007) in epilepsy models.

Even though all imaging techniques reveal changes in BBB integrity, MRI detects BBB leakage that is missed by PET and SPECT. Thus, MRI is superior to PET and SPECT in the used study design. However, every imaging modality has its specific limitations (James & Gambhir, 2012). A combinational use of PET, SPECT and MRI could therefore benefit from the strength of each imaging technique.

The results of the present studies are important as they provide further insights into the dynamics of BBB leakage and cerebral edema formation during epileptogenesis.

Moreover, they offer suitable imaging protocols to further evaluate the role of BBB impairment as potential biomarker for epileptogenesis. A combination of MRI and nuclear imaging may be beneficial for further investigating BBB during epileptogenesis in the future.

5.8 Conclusion

The study has offered an evaluative perspective on multimodal molecular imaging of changes in BBB integrity during epileptogenesis.

In the current studies, we present evidence that pre-clinical nuclear imaging is a valuable tool for the evaluation of BBB integrity. While contrast-enhanced MRI is a generally accepted and widely used tool for detecting BBB impairment, our observations that [68Ga]-DTPA PET and [99mTc]-DTPA SPECT can contribute to evaluation of BBB integrity during epileptogenesis are novel.

Our results show for the first time a successful reduction of BBB leakage by a dosing regimen of dexamethasone in mice during epileptogenesis which may contribute to epileptogenesis-modifying pharmacotherapies. The use of in vivo MR imaging enables the evaluation of pharmacotherapeutic effects on BBB integrity. Thus, assessment of patients responding to BBB-protective therapy may be feasible in the future.

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