A breast securement device for an imaging system is provided. The securement device includes a retainer configured to attach to at least a portion of a patient's breast and a tensioning system coupled to the retainer. The tensioning system is configured to pull the retainer away from a chest wall of the patient so as to apply a pulling force to the patient's breast. The retainer may include a substantially tubular-shaped mesh material having a first end configured to receive at least a portion of the patient's breast and an opposite second end coupled to the tensioning system. In another example, the retainer may include a vacuum bag having a first end configured to receive at least a portion of the patient's breast. In still another example, the retainer may include an adhesive member configured to adhere to the patient's breast.