Korean Journal of Radiology

The Korean Society of Radiology (대한영상의학회)
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Diffusion-Weighted Imaging for Pretreatment Evaluation and Prediction of Treatment Effect in Patients Undergoing CT-Guided Injection for Lumbar Disc Herniation

  • Niu, Xiang-Ke (Department of Radiology, Affiliated Hospital of Chengdu University) ;
  • Bhetuwal, Anup (Sichuan Key Laboratory of Medical Imaging and Department of Radiology, Affiliated Hospital of North Sichuan Medical College) ;
  • Yang, Han-Feng (Sichuan Key Laboratory of Medical Imaging and Department of Radiology, Affiliated Hospital of North Sichuan Medical College)
  • Received : 2014.05.08
  • Accepted : 2015.03.12
  • Published : 2015.08.01
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Abstract

Objective: To determine whether a change in apparent diffusion coefficient (ADC) value could predict early response to CTguided Oxygen-Ozone ($O_2-O_3$) injection therapy in patients with unilateral mono-radiculopathy due to lumbar disc herniation. Materials and Methods: A total of 52 patients with unilateral mono-radiculopathy received a single intradiscal (3 mL) and periganglionic (5 mL) injection of an $O_2-O_3$ mixture. An ADC index of the involved side to the intact side was calculated using the following formula: pre-treatment ADC index = ([ADC involved side - ADC intact side] / ADC intact side) $\times$ 100. We analyzed the relationship between the pre-treatment Oswestry Disability Index (ODI) and the ADC index. In addition, the correlation between ODI recovery ratio and ADC index was investigated. The sensitivity and specificity of the ADC index for predicting response in $O_2-O_3$ therapy was determined. Results: Oswestry Disability Index and the ADC index was not significantly correlated (r = -0.125, p = 0.093). The ADC index and ODI recovery ratio was significantly correlated (r = 0.819, p < 0.001). When using 7.10 as the cut-off value, the ADC index obtained a sensitivity of 86.3% and a specificity of 82.9% for predicting successful response to therapy around the first month of follow-up. Conclusion: This preliminary study demonstrates that the patients with decreased ADC index tend to show poor improvement of clinical symptoms. The ADC index may be a useful indicator to predict early response to CT-guided $O_2-O_3$ injection therapy in patients with unilateral mono-radiculopathy due to lumbar disc herniation.

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References

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