An Unsupervised Deep Learning Framework for Retrospective Gating of Catheter-Based Cardiac Imaging

Figure 11

Average dissimilarity plots and their amplitude spectra for (a) an IVOCT and (b) an IVUS image sequence. In the amplitude spectra, two red dotted lines show the search range for the average heart rate, which is 45–200 bpm. The red dots marked with coordinates indicate the strong local peaks found within this range, whose horizontal coordinate is the estimated average heart rate. That is, the average heart rates estimated from the IVOCT and IVUS image sequences are 78 and 87, respectively.

(a)

(b)