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Pulmonary angiography using 16 slice multidetector computed tomography in normal dogs.

Amy Habing1, Joana C Coelho, Nathan Nelson

  • 1Department of Small Animal Clinical Sciences, D211 College of Veterinary Medicine, Michigan State University, East Lansing, MI 48824, USA. amhabing@gmail.com

Veterinary Radiology & Ultrasound : the Official Journal of the American College of Veterinary Radiology and the International Veterinary Radiology Association
|March 11, 2011
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Summary

A new canine computed tomography (CT) pulmonary angiography technique using multidetector CT (MDCT) allows for rapid and consistent evaluation of pulmonary vasculature. A single dose of 400 mg I/kg nonionic contrast medium is effective for this canine CT angiography.

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Area of Science:

  • Veterinary Radiology
  • Medical Imaging
  • Cardiovascular Imaging

Background:

  • Accurate imaging of the pulmonary vasculature is crucial for diagnosing cardiopulmonary diseases in canines.
  • Multidetector computed tomography (MDCT) offers advanced imaging capabilities for detailed anatomical visualization.
  • Optimizing contrast medium administration and timing is essential for effective CT pulmonary angiography.

Purpose of the Study:

  • To report a novel canine computed tomography (CT) pulmonary angiography technique utilizing multidetector CT (MDCT).
  • To evaluate the efficacy of a specific nonionic contrast medium dose and administration protocol for canine CT angiography.
  • To assess the consistency and quality of pulmonary arterial enhancement and visualization of subsegmental branches.

Main Methods:

  • A 16-slice MDCT scanner was used for helical acquisition (pitch 1.4) in five healthy, anesthetized beagles.
  • A bolus-tracking program determined the optimal time delay for contrast enhancement.
  • Nonionic contrast medium (Iohexol 300 mg I/ml) was administered at 400 mg I/kg via cephalic catheter with a power injector at 5 ml/s; dose variations (200 and 600 mg I/kg) were tested in two dogs.

Main Results:

  • The median number of visualized subsegmental arterial branches was five (range: 2-7).
  • Optimal pulmonary artery enhancement was consistently observed between 6-8 seconds post-injection in 4/5 dogs.
  • A contrast dose of 400 mg I/kg yielded good to excellent vascular enhancement in 4/5 dogs, while 200 mg I/kg resulted in poor enhancement.

Conclusions:

  • Canine CT pulmonary angiography using MDCT and an automated bolus-tracking program enables rapid and consistent evaluation of the pulmonary vasculature.
  • A single dose of 400 mg I/kg of nonionic contrast medium is sufficient for achieving diagnostic quality imaging.
  • This technique provides reliable visualization of pulmonary arterial branches, aiding in the diagnosis of canine cardiopulmonary conditions.