Diagnostic Validity of [18F]GP1 PET for Diagnosing Acute Deep Vein Thrombosis

Inclusion Criteria: * A subject will be enrolled if he/she meets all of the following inclusion criteria. * Subject is aged between 19 and 79 years and male or female of any race/ethnicity. * Patient has a first episode of clinically suspected acute deep vein thrombosis of the lower extremity within 14 days prior to the planned \[18F\]GP1 PET/CT. * The pretest probability for deep vein thrombosis is likely by two-level Wells score (≥ 2), or the D-dimer test is positive. * Subject underwent or is scheduled to undergo venous ultrasonography within 7 days of \[18F\]GP1 PET/CT: * Patient has Eastern Cooperative Oncology Group performance status of 0-2 at time of screening. Exclusion Criteria: * A subject is to be excluded from the study if he/she does not fulfill the inclusion criteria or display any of the following criteria. * Subject or subject's legally acceptable representative does not provide written informed consent. * Subject has a previous history of objectively diagnosed deep vein thrombosis or pulmonary embolism. * Subject has symptoms of acute deep vein thrombosis lasting for longer than 4 weeks at time of screening. * Subject is suspected to have pulmonary embolism with shock or hypotension * Subject had pretreatment with glycoprotein IIb/IIIa inhibitors within 15 days before the administration of \[18F\]GP1. * Anticancer chemotherapy is scheduled to be given to subject before or within 24 hours after administration of \[18F\]GP1. * Fema…