2Forbes K,Stevenson AJ.The use of power Doppler ultrasound in the diagnosis of isolated deep venous thrombosis of the calf.Clin Radiol,1998,53(10):752-754.
3Labropoulos N,Webb KM,Kang SS,et al.Patterns and distribution of isolated calf deep vein thrombosis.J Vasc Surg,1999,30(5):787-793.
4Mitchell DG,Merton DA,Liu JB,et al.Superficial masses with color flow Doppler imaging.J Clin Ultrasound,1991,19:555-560.
