Figure 4.

Frequency of diagnostic coronary segments depending on heart rate (HR) for high-pitch mode versus sequential and retrospective low-pitch modes. At high-pitch mode, assessability of segments began to decline significantly for HR > 60. Only a few patients at HR 70–80/min were scanned at high-pitch mode, hence further decline could not be shown on a significant level. At sequential and low-pitch retrospective modes, the frequency of diagnostic segments remained very high at HR up to 80/min. At HR > 80/min, a tendency towards lower assessability of segments could be observed, but this could not be proven on a significant level due to few examinations with very high heart rates.