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Table 1: 
Gamma knife treatment parameters and elapsed time to imaging and diagnosis*
Final DiagnosisGK Target Volume (mL)IDL (mL)IDL (%)GK Dose (Gy)Time to MRI (days)†Time to Final Diagnosis (days)‡Imaging Follow-Up Time (days)§
Recurrent tumor6.38 (5.2)8.14 (6.5)52 (0.7)16.85 (1.1)307 (149)432 (327)462 (195)
Radiation necrosis4.29 (3.7)5.46 (4.1)54 (0.1)17.55 (0.8)301 (118)353 (171)402 (237)
Welch P value.22.18.61.06.89.40.86
  • Note:—IDL indicates isodose line.
  • * All data are presented in mean values (SD).
  • † Represents number of days elapsed between initial radiosurgery and perfusion MR imaging examination.
  • ‡ Represents number of days elapsed between initial radiosurgery and final determination of metastatic tumor recurrence or radiation necrosis.
  • § Represents number of days elapsed between time of clinical diagnosis and loss to follow-up or death.