Abstract
To evaluate the effect of stereotactic radiosurgery (SRS) on intracranial metastases with diffusion-weighted imaging/apparent diffusion coefficient maps. A total of 107 patients with 144 metastases larger than 1 cm in diameter were retrospectively reviewed. We calculated the DWITumor/white matter ratios (DWIT/WM ratio) between the metastases and the normal, contralateral frontal white matter at each time point. We also recorded the ADC values for metastases (ADCT values). The DWIT/WM ratio and ADCT values were assessed for correlation with the patients’ tumor response, brain edema, and survival. A decrease in DWIT/WM ratios was seen in the controlled metastases, and an increase in the DWIT/WM ratio were seen in the metastases with poor tumor control. On the other hand, an increase in ADCT values was seen in the controlled metastases, and a decrease in ADCT values was seen in the metastases with poor control. The differences were significant (p value: 0.001 and 0.002, respectively). Sensitivity of a decrease in the DWIT/WM ratio to make an early prediction of tumor control was 83.9 %, and specificity was 88.5 %. When using the initial ADCT values of metastases to predict tumor response, sensitivity and specificity were 85.5 and 72.7 %, respectively. DWI/ADC is a practical method for studying the efficacy of SRS and predicting early metastases response progression. A decrease signal on DWI and increased ADC values are indicators of good tumor control, and reflect the beneficial effect of SRS.
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Abbreviations
- ADC:
-
Apparent diffusion coefficient
- ARE:
-
Adverse radiation effect
- CTP:
-
Computed tomography perfusion
- DWI:
-
Diffusion-weighed images
- FDG-PET:
-
Positron emission tomography with 18Ffluoro-2-deoxy-d-glucose
- FLAIR:
-
Fluid attenuated inversion recovery
- GI:
-
Gastrointestinal
- GKS:
-
Gamma-knife surgery
- Gy:
-
Gray
- KPS:
-
Karnofsky Performance Scale
- MET-PET:
-
Positron emission tomography with 11Cmethyl-l-methionine
- MR:
-
Magnetic resonance
- MRP:
-
Magnetic resonance perfusion
- MRS:
-
Magnetic resonance spectroscopy
- NSCLC:
-
Non-small cell lung cancer
- rCBV:
-
Relative cerebral blood volume
- SCLC:
-
Small cell lung cancer
- SPECT:
-
Single photon emission computed tomography
- SRS:
-
Stereotactic radiosurgery
- T1WI:
-
T1-weighted images
- T2WI:
-
T2-weighted images
- WBRT:
-
Whole brain radiotherapy
- WM:
-
White mater
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Lee, CC., Wintermark, M., Xu, Z. et al. Application of diffusion-weighted magnetic resonance imaging to predict the intracranial metastatic tumor response to gamma knife radiosurgery. J Neurooncol 118, 351–361 (2014). https://doi.org/10.1007/s11060-014-1439-9
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DOI: https://doi.org/10.1007/s11060-014-1439-9