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TABLE 5: 
Grading summary for all vessels examined
GradeVascular Signal*Impact of Contrast Enhancement†
Precontrast ImagesPostcontrast ImagesPostcontrast Images
FrequencyPercentageFrequencyPercentageFrequencyPercentage
043089.643690.845594.8
1234.8326.7163.3
2265.4122.591.9
NR10.200.0——
 Total480100480100480100
  • Note.—Data are for median grades across all five observers.
  • * Vascular signal grade 0 indicates normal segment or region; 1, diminished flow; 2, absent flow; and NR, not readable.
  • † Impact of contrast enhancement grade 0 indicates no effect; 1, adverse effect but tolerable; 2, nondiagnostic.