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Fig. 3 —Scatter graph of agreement between MDCT and digital angiography for assessment of in-stent stenosis for mild (n = 40: two stents were scanned, 10 tube settings; data of two observers) and moderate in-stent stenoses (n = 20: one stent). Data are shown in three groups according to tube voltage: = 80, = 100, and = 120 kVp. For moderate stenoses, there were no significant differences found between kVp groups (p values between 0.6 and 0.9). For mild stenoses, there was significant improvement for 100 kVp versus 80 (p = 0.03) and also versus 120 kVp (p = 0.003). Mean and SD of all tube voltages are added.