title: A comparison between colour duplex ultrasonography and arteriography for imaging infrapopliteal arterial lesions.
abstract: OBJECTIVE
  To investigate the agreement between colour duplex ultrasonography and digital subtraction arteriography of the infrapopliteal arteries.
  
  
  METHODS
  Retrospective, blinded study.
  
  
  METHODS
  Vascular laboratory and Radiology Department, University Hospital.
  
  
  METHODS
  The infrapopliteal vasculature was examined in a total of 51 limbs by both colour duplex ultrasound and digital subtraction angiography. By examining all arteries from the distal popliteal to the pedal arteries, a total of 204 individual arterial segments were available for analysis. Each segment was graded as 0-49%, 50-99% diameter reduced or occluded by both modalities. Using ultrasound, classification of stenoses was achieved by observing peak systolic velocity ratios; a doubling of peak systolic velocity indicating a > or = 50% diameter reducing stenosis. Where no Doppler signal could be obtained, the vessel was assumed to be occluded. From angiographic studies, two radiologists separately and blindly assessed the extent of disease for each infrapopliteal artery noting areas of > or = 50% diameter reduction and occlusion. The Kappa statistic was used to examine the level of agreement between angiography and ultrasound as well as between both radiologists.
  
  
  RESULTS
  The Kappa level (95% confidence interval) of agreement between ultrasound and angiographic assessments for distinguishing patent from occluded segments was 0.61 (0.49-0.74) for all segments. The equivalent agreement between radiologists was 0.80 (0.70-0.89). Poorest agreement was observed from ultrasound assessments of the peroneal and tibioperoneal trunk arterial segments.
  
  
  CONCLUSIONS
  Since agreement between colour duplex scanning and angiography never fell significantly below levels achieved between two radiologists, we conclude that colour duplex ultrasound can be used to assess infrapopliteal artery patency.
authors.affiliation: Department of Medical Physics, Leicester Royal Infirmary, U.K.
authors.forename: Y
authors.initials: Y
authors.lastname: Sensier
authors.forename: G
authors.initials: G
authors.lastname: Fishwick
authors.forename: R
authors.initials: R
authors.lastname: Owen
authors.forename: M
authors.initials: M
authors.lastname: Pemberton
authors.forename: P R
authors.initials: PR
authors.lastname: Bell
authors.forename: N J
authors.initials: NJ
authors.lastname: London
mesh_terms: D000368:Aged; D000369:Aged, 80 and over; D015901:Angiography, Digital Subtraction; D001157:Arterial Occlusive Diseases / Q000000981:diagnostic imaging; D006801:Humans; D007866:Leg / Q000098:blood supply*; D008875:Middle Aged; D012189:Retrospective Studies; D012680:Sensitivity and Specificity; D018615:Ultrasonography, Doppler, Color