Clinical value of thin collimation in the diagnostic workup of pulmonary embolism

AJR Am J Roentgenol. 2000 Aug;175(2):407-11. doi: 10.2214/ajr.175.2.1750407.


Objective: We report our experience with thin-collimation helical CT in a population of patients suspected of having pulmonary embolism.

Conclusion: Thin-collimation helical CT provided technically acceptable examinations for pulmonary embolism in 360 patients (97%). In this population, CT revealed pulmonary embolism in 104 patients (29%), negative findings in 217 patients (59%), indeterminate findings in 39 patients (10%), and alternative diagnoses in 65% of patients with negative or inconclusive findings. Ventilation-perfusion scanning and Doppler sonography of the lower extremities were performed in 158 (44%) and 133 patients (37%), respectively, whereas pulmonary angiography was performed in 27 patients (7.5%). The estimated false-negative rate of helical CT was 5%.

Publication types

  • Clinical Trial

MeSH terms

  • Adolescent
  • Adult
  • Aged
  • Aged, 80 and over
  • Female
  • Follow-Up Studies
  • Humans
  • Male
  • Middle Aged
  • Pulmonary Embolism / diagnostic imaging*
  • Pulmonary Veins / diagnostic imaging
  • Tomography, X-Ray Computed* / methods