The impact of vessel orientation in space on densitometric measurements of cross sectional areas of coronary arteries

International Journal of Cardiac Imaging
P A DoriotW Rutishauser

Abstract

Under ideal conditions, densitometric measurement of a coronary arterial cross section in biplane angiographic images should result in nearly equal cross sectional areas for both planes. However, quite appreciable discrepancies have been found by some authors in patients. In this study, the role of inadequate spatial orientation of the vessel axes relatively to the x-rays was assessed by use of a 3D technique applied to 60 stenoses (45 pre PTCA and 15 post PTCA) in simultaneously acquired digital biplane coronary angiograms of 27 CAD patients. The 3D technique yields two radius values per projection directly in mm at any arterial cross section of interest. This was used to determine the areas Ar(in mm2) of the reference cross sections. As with catheter calibration, these cross sections were thus assumed to be more or less circular, but out-of-plane effects and errors due to a catheter diameter determination in pixels were avoided. The areas of the stenotic sections were then determined densitometrically (in mm2) from the two projections (1 and 2) according to As1 = ArDs1/Dr1, resp. As2 = ArDs2/Dr2, where Dr1, Dr2, Ds1 and Ds2 are the conventional densitometric areas of the reference and stenotic cross sections measured in plane...Continue Reading

References

Jan 1, 1979·Catheterization and Cardiovascular Diagnosis·T SandorS Paulin
Jan 1, 1992·International Journal of Cardiac Imaging·P A DoriotW Rutishauser
Jan 1, 1991·Physics in Medicine and Biology·N GuggenheimW Rutishauser
Nov 1, 1989·European Heart Journal·P A DoriotW Rutishauser
Jan 1, 1985·Catheterization and Cardiovascular Diagnosis·J H ReiberP W Serruys
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Oct 1, 1993·Journal of the American College of Cardiology·D M HerringtonG D Walford

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Citations

Jul 18, 2001·Pathology Oncology Research : POR·J TímárS Paku
Jan 22, 1998·Physics in Medicine and Biology·P A DoriotJ J Bodenmann

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