Dual Energy CT of peripheral arteries and Dual Energy CT Angiography of Peripheral Arterial Occlusive Disease
Scott Schonhover, technologist, USA, has sent the following question:
DE Runoffs: Is anyone doing these either as research or in a clinical setting? If so is there a protocol for scanning and/or injection?
I undertand that certain body habitus patients would exceed scan FOV’s. One of our doc’s is contemplating a research study on these?
Thorsten R.C. Johnson, M.D., Department of Clinical Radiology, University Hospitals Munich:
We are using the ‘body bone removal’ for clinical purposes, and an own full paper from our institution is in press for Investigative Radiology. There are also other scientific papers already published:
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Dual energy CT of peripheral arteries: Effect of automatic bone and plaque removal on image quality and grading of stenoses.
Meyer BC, Werncke T, Hopfenmüller W, Raatschen HJ, Wolf KJ, Albrecht T.
Eur J Radiol. 2008 Dec;68(3):414-22. Epub 2008 Oct 28.
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Dual-Energy CT Angiography in Peripheral Arterial Occlusive Disease.
Brockmann C, Jochum S, Sadick M, Huck K, Ziegler P, Fink C, Schoenberg SO, Diehl SJ.
Cardiovasc Intervent Radiol. 2009 Jan 9. [Epub ahead of print]
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The field of view is generally not a problem if a central position in the gantry is ensured; the main arteries are virtually never more than 27 cm apart. The injection protocol will have to account for a long scan time with limited pitch of 0.7 maximum. The scan times will be in the range of 35 seconds, so about 120-150 ml at a flow of 4 ml/s should do. Use 1.2 mm collimation to obtain sufficient SNR in the trunk.
