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THORACIC VASCULATURE |
1 From the Department of Radiology, Winthrop-University Hospital, 259 First St, Mineola, NY 11501 (D.S.K., D.B., A.M.G., R.M.); and the Department of Radiology, Roswell Park Cancer Institute, Buffalo, NY (P.A.L., D.L.K., Z.D.G.). Presented as an education exhibit at the 2001 RSNA scientific assembly. Received February 6, 2002; revision requested March 26 and received May 7; accepted May 15. Address correspondence to D.S.K. (e-mail: dsk2928@pol.net).
The combination of computed tomographic (CT) venography and pulmonary angiography (CTVPA) was initially described in 1998 as a single comprehensive noninvasive imaging examination for suspected thromboembolic disease. It allowed the identification of pulmonary embolism as well as deep venous thrombosis (DVT) in the abdomen, pelvis, thighs, and calves. The venographic portion of CTVPA has now been studied by multiple researchers and has been shown to be an accurate imaging study for the thigh veins in comparison with lower extremity sonography. In contrast to sonography, however, CTVPA readily and rapidly permits evaluation of the inferior vena cava, the pelvic veins, the calf veins, and all of the superficial venous system. Complex venous anatomy can be surveyed, an additional sonographic study is not required, and only a few extra minutes and images are required over and above CT pulmonary angiography. A review of 957 recent cases of suspected pulmonary embolism examined with CTVPA revealed an overall 10.5% frequency of DVT, with a nearly equal distribution of thrombosis at the common femoral, superficial femoral, popliteal, and deep calf veins. Although a variety of protocols for CTVPA may be implemented, including a contiguous helical acquisition, obtaining 5- or 10-mm-thick images every 4 cm provides a high degree of accuracy and decreases overall radiation dose.
© RSNA, 2002
Index Terms: Computed tomography (CT), angiography, 93.12916, 98.12916 • Embolism, pulmonary, 60.72 • Thrombosis, CT, 93.12916, 98.12916 • Veins, CT, 93.12916, 98.12916 • Veins, thrombosis, 93.751, 98.751
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