𝔖 Bobbio Scriptorium
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MR imaging of Ho:YAG laser diskectomy with histologic correlation

✍ Scribed by Jeffrey J. Phillips; George E. Kopchok; Shi-Kaung Peng; Mark P. Mueller; Rodney A. White

Publisher
John Wiley and Sons
Year
1993
Tongue
English
Weight
620 KB
Volume
3
Category
Article
ISSN
1053-1807

No coin nor oath required. For personal study only.

✦ Synopsis

Abstract

Twelve cadaveric vertebral specimens were imaged after holmium yttrium aluminum garnet (Ho:YAG) laser diskectomy to determine the usefulness of magnetic resonance (MR) imaging in evaluating treatment outcome. The Ho:YAG laser was operated at 1.0‐2.0 J per pulse, 5 Hz, and 250‐usec pulse width. The total energy varied between 600 and 2,700 J. Two distinct patterns emerged on MR images. Tissue ablation at higher power (1.5 and 2.0 J per pulse) produced discrete signal voids that correlated with areas of laser‐induced ablation identified at gross inspection. More subtle changes, characterized by a high‐signal‐intensity ring, were seen in the specimens lased at 1.0 J per pulse. The latter appearance corresponded to incomplete vaporization of diskal tissue, a broader zone of minimal thermal injury, and sparing of adjacent vertebral endplates. Total mass loss did not appear to be affected by the choice of power setting (1.0 vs 1.5 J per pulse), with total laser energy held constant.

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