CREATE TABLE table_31911 ("Name" TEXT, "Investigation" TEXT, "Route of administration" TEXT, "In-vitro / in-vivo" TEXT, "Imaging / non-imaging" TEXT)

Tell me the naame of Investigation of thrombus imaging
SELECT "Name" FROM table_31911 WHERE "Investigation" = 'thrombus imaging'
SELECT "Name" FROM "table_31911" WHERE "Investigation" = 'thrombus imaging'