Journal of Veterinary Science

The Korean Society of Veterinary Science (대한수의학회)
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Comparison of bone subtraction CT angiography with standard CT angiography for evaluating circle of Willis in normal dogs

  • Soyon An (Institute of Animal Medicine, College of Veterinary Medicine, Gyeongsang National University) ;
  • Gunha Hwang (Institute of Animal Medicine, College of Veterinary Medicine, Gyeongsang National University) ;
  • Rakhoon Kim (Institute of Animal Medicine, College of Veterinary Medicine, Gyeongsang National University) ;
  • Tae Sung Hwang (Institute of Animal Medicine, College of Veterinary Medicine, Gyeongsang National University) ;
  • Hee Chun Lee (Institute of Animal Medicine, College of Veterinary Medicine, Gyeongsang National University)
  • Received : 2023.04.27
  • Accepted : 2023.08.01
  • Published : 2023.09.30
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Abstract

Background: Bone subtraction computed tomography angiography (BSCTA) is a useful alternative technique for improving visualization of vessels surrounded by skull bone. However, no studies have compared computed tomography angiography (CTA) and BSCTA for improving the visibility of canine cerebral blood vessels. Objectives: To evaluate the potential benefit of BSCTA for better delineation of brain arteries of the circle of Willis (CoW) in dogs by comparing BSCTA with non-subtraction computed tomography angiography (NSCTA). Methods: Brain CTA was performed for nine healthy beagle dogs using a bolus tracking method with saline flushing. A total dose of 600 mgI/kg of contrast agent with an iodine content of 370 mgI/mL was injected at a rate of 4 ml/s. Bone removal was achieved automatically by subtracting non-enhanced computed tomography (CT) data from contrast CT data. Five main intracranial arteries of the CoW were analyzed and graded on a scale of five for qualitative evaluation. Results: Scores of basilar artery, middle cerebral artery, and rostral cerebral artery in the BSCTA group were significantly higher than those in the NSCTA group (p = 0.001, p = 0.020, and p < 0.0001, respectively). Scores of rostral cerebellar artery (RcA) and caudal cerebral artery (CCA) did not differ significantly between the two groups. However, scores of RcA and CCA in the BSCTA group were higher than those in the NSCTA group. Conclusions: BSCTA improved visualization of intracranial arteries of the CoW with close contact to bone. Thus, it should be recommended as a routine scan method in dogs suspected of having brain vessel disease.

Keywords

Acknowledgement

We thank Canon Medical Systems Korea, especially Sean Kang (CT application specialist), for assistance with image acquisition and technical cooperation.

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