Title
Quantifying the effect of repetitive transcranial magnetic stimulation in the rat brain by <tex>$\mu$</tex>SPECT CBF scansQuantifying the effect of repetitive transcranial magnetic stimulation in the rat brain by <tex>$\mu$</tex>SPECT CBF scans
Author
Faculty/Department
Faculty of Medicine and Health Sciences
Research group
Molecular Imaging, Pathology, Radiotherapy & Oncology (MIPRO)
Publication type
article
Publication
Subject
Human medicine
Source (journal)
Brain stimulation
Volume/pages
6(2013):4, p. 554-562
ISSN
1935-861X
ISI
000322292600013
Carrier
E
Target language
English (eng)
Full text (Publishers DOI)
Affiliation
University of Antwerp
Abstract
Background: Repetitive transcranial magnetic stimulation (rTMS) is used to treat neurological and psychiatric disorders such as depression and addiction amongst others. Neuro-imaging by means of SPECT is a non-invasive manner of evaluating regional cerebral blood flow (rCBF) changes, which are assumed to reflect changes in neural activity. Objective: rCBF changes induced by rTMS are evaluated by comparing stimulation on/off in different stimulation paradigms using microSPECT of the rat brain. Methods: Rats (n = 6) were injected with 10 mCi of Tc-99m-HMPAO during application of two rTMS paradigms (1 Hz and 10 Hz, 1430 A at each wing of a 20 mm figure-of-eight coil) and sham. SPM- and VOI-based analysis was performed. Results: rTMS caused widespread significant hypoperfusion throughout the entire rat brain. Differences in spatial extent and intensity of hypoperfusion were observed between both stimulation paradigms: 1 Hz caused significant hypoperfusion (P < 0.05) in 11.9% of rat brain volume while 10 Hz caused this in 23.5%; the minimal t-value induced by 1 Hz was -24.77 while this was -17.98 due to 10 Hz. Maximal percentage of hypoperfused volume due to 1 Hz and 10 Hz was reached at tissue experiencing 0.03-0.15 V/m. Conclusion: High-frequency (10 Hz) stimulation causes more widespread hypoperfusion, while 1 Hz induces more pronounced hypoperfusion. The effect of rTMS is highly dependent on the electric field strength in the brain tissue induced by the TMS coil. This innovative imaging approach can be used as a fast screening tool in quantifying and evaluating the effect of various stimulation paradigms and coil designs for TMS and offers a means for research and development. (C) 2013 Elsevier Inc. All rights reserved.
E-info
https://repository.uantwerpen.be/docman/iruaauth/716f75/d9e5371.pdf
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