Name the high rebounds for td garden 18,624
CREATE TABLE "game_log" (
  "num" real,
  "date" text,
  "visitor" text,
  "score" text,
  "arena_attendance" text,
  "high_points" text,
  "high_rebounds" text,
  "high_assists" text,
  "record" text
);
SELECT "high_rebounds" FROM "game_log" WHERE "arena_attendance"='TD Garden 18,624';