Abstract
Objective
Reliable identification of the subthalamic nucleus (STN) and globus pallidus interna (GPi) is critical for deep brain stimulation (DBS) of these structures. The purpose of this study was to compare the visibility of the STN and GPi with various MRI techniques and to assess the suitability of each technique for direct stereotactic targeting.
Methods
MR images were acquired from nine volunteers with T2- and proton density-weighted (PD-W) fast spin echo, susceptibility-weighted imaging (SWI), phase-sensitive inversion recovery and quantitative T1, T2 and T2* mapping sequences. Contrast-to-noise ratios (CNR) for the STN and GPi were calculated for all sequences. Targeting errors on SWI were evaluated on magnetic susceptibility maps. The sequences demonstrating the best conspicuity of DBS target structures (SWI and T2*) were then applied to ten patients with movement disorders, and the CNRs for these techniques were assessed.
Results
SWI offers the highest CNR for the STN, but standard PD-W images provide the best CNR for the pallidum. Susceptibility maps indicated that the GPi margins may be shifted slightly on SWI, although no shifts were seen for the STN.
Conclusion
SWI may improve the visibility of the STN on pre-operative MRI, potentially improving the accuracy of direct stereotactic targeting.
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Abbreviations
- CNR:
-
contrast-to-noise ratio(s)
- DBS:
-
deep brain stimulation
- DESPOT1 :
-
driven equilibrium single-pulse observation of T1
- FSE:
-
fast spin echo
- GPi:
-
globus pallidus interna
- GRE:
-
gradient echo
- IR:
-
inversion recovery
- IR-FSPGR:
-
inversion recovery prepared fast spoiled gradient echo volume
- PSIR:
-
phase sensitive inversion recovery
- PD:
-
Parkinson’s disease
- PD-W:
-
proton density-weighted
- STN:
-
subthalamic nucleus
- SWI:
-
susceptibility-weighted imaging
- TE:
-
echo time
- TI:
-
inversion time
- TR:
-
repetition time
- T2-W:
-
T2-weighted
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Acknowledgements
The authors would like to thank Sean Deoni for supplying the DESPOT sequence.
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O’Gorman, R.L., Shmueli, K., Ashkan, K. et al. Optimal MRI methods for direct stereotactic targeting of the subthalamic nucleus and globus pallidus. Eur Radiol 21, 130–136 (2011). https://doi.org/10.1007/s00330-010-1885-5
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DOI: https://doi.org/10.1007/s00330-010-1885-5