Abstract
Objectives
To assess the feasibility, safety and efficacy of real-time MR guidance and thermometry of percutaneous laser disc decompression (PLDD).
Methods
Twenty-four discs in 22 patients with chronic low-back and radicular pain were treated by PLDD using open 1.0-T magnetic-resonance imaging (MRI). A fluoroscopic proton-density-weighted turbo spin-echo (PDw TSE) sequence was used to position the laser fibre. Non-spoiled gradient-echo (GRE) sequences were employed for real-time thermal monitoring based on proton resonance frequency (PRF). Radicular pain was assessed over 6 months with a numerical rating scale (NRS).
Results
PLDD was technically successful in all cases, with adequate image quality for laser positioning. The PRF-based real-time temperature monitoring was found to be feasible in practice. After 6 months, 21 % reported complete remission of radicular pain, 63 % at least great pain relief and 74 % at least mild relief. We found a significant decrease in the NRS score between the pre-intervention and the 6-month follow-up assessment (P < 0.001). No major complications occurred; the single adverse event recorded, moderate motor impairment, resolved.
Conclusions
Real-time MR guidance and PRF-based thermometry of PLDD in the lumbar spine under open 1.0-T MRI appears feasible, safe and effective and may pave the way to more precise operating procedures.
Key Points
• Percutaneous laser disc decompression (PLDD) is increasingly used instead of conventional surgery.
• Open 1.0-T MRI with temperature map** seems technically successful in monitoring PLDD.
• Pain relief was at least ‘great’ in 64 % of patients.
• No major complications occurred.
• Open 1.0-T MRI appears a safe and effective option for patient-tailored PLDD.
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Abbreviations
- FOV:
-
Field of view
- FSE:
-
Fast spin echo
- GRE:
-
Gradient echo
- NRS:
-
Numerical rating scale
- NSA:
-
Number of signal averages
- PDw:
-
Proton-density-weighted
- PLDD:
-
Percutaneous laser disc decompression
- PRF:
-
Proton resonance frequency
- SD:
-
Standard deviation
- SL:
-
Slice size
- SPAIR:
-
Spectral adiabatic inversion recovery
- TA:
-
Acquisition time
- TSE:
-
Turbo spin echo
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Acknowledgments
We thank Prof. Johannes Hellinger (München) for valuable and instructive discussion. This work was supported in part by grants from the Technologiestiftung Berlin – Zukunftsfonds Berlin (TSB) and the EU's European Fund for Regional Development (grant no. 10132816/10134231).
Fourteen of the patients in this study have been included in an already published diagnostic imaging study [16].
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Streitparth, F., Hartwig, T., Walter, T. et al. MR guidance and thermometry of percutaneous laser disc decompression in open MRI: an initial clinical investigation. Eur Radiol 23, 2739–2746 (2013). https://doi.org/10.1007/s00330-013-2872-4
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DOI: https://doi.org/10.1007/s00330-013-2872-4