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(a) Determination of the lines that yielded the angle of interest, taking for example the LMT–LAD angle in the Spider view. We used the centreline of the coronary angiogram. (b) Measurements of angles. The LMT bifurcation angle was measured in the Spider and the RAO caudal views. LAD, left anterior descending; LCX, left circumflex; LMT, left main trunk; RAO, right anterior oblique.
