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1
Department of Radiology, Cliniques Universitaires St-Luc, av. Hippocrate 10,
B-1200 Brussels, Belgium.
2
Department of Internal Medicine Unit, Cliniques Universitaires St-Luc, B-1200
Brussels, Belgium.
OBJECTIVE. The purpose of this study was to assess the value of dual-slice helical CT angiography in detecting deep venous thrombosis in patients in whom acute pulmonary embolism was suspected and to describe the additional extrathoracic findings.
SUBJECTS AND METHODS. Sixty-five consecutive patients were examined for suspected pulmonary embolism using helical CT of the chest (2.7-mm collimation; table speed, 7.5 mm/sec; 100-140 mL of contrast medium injected at a rate of 3 mL/sec) followed by CT of the lower limbs (6.5-mm collimation; table speed, 10 mm/sec) without any additional contrast medium injection. Sequential scanning of the abdomen was performed using 10-mm collimation and an interval of 40 mm. Color Doppler sonography of the lower limbs was done within 24 hr of CT by two radiologists who were unaware of CT findings. Results of CT venography were compared with those of Doppler sonography and with phlebography or repeated focalized sonography in cases of discrepancy.
RESULTS. Twenty-two patients had pulmonary embolism revealed on
chest CT. Sixteen patients had a deep venous thrombosis. Thirteen patients
with pulmonary embolism had a deep venous thrombosis. Three patients with deep
venous thrombosis had no pulmonary embolism. Sensitivity and specificity for
diagnosing deep venous thrombosis with CT was 93% and 97%, respectively
(
= 0.88). Additional extrathoracic findings were observed in four
patients.
CONCLUSION. Combined CT venography with dual-slice scanning is an accurate method to diagnose deep venous thrombosis that may reveal additional imaging findings in some patients with possible pulmonary embolism.
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