Sample Volume Positioning in Colour-Coded Doppler Myocardial Imaging: Effect of Systolic and Diastolic Tracking

Effect of sample volume size and sampling method on feline longitudinal myocardial velocity profiles from color tissue Doppler imaging

“…10 In humans, one similar study has been conducted, testing the effect of tracking on the absolute values of myocardial velocity variables at three locations in the heart. 27 This study showed that tracking of the SV resulted in a significantly reduced e 0 velocity in all investigated segments compared with end-systolic sampling, in contrast to our data in which no difference could be demonstrated. This study also demonstrated that manual tracking reduced intraobserver, but not Interobserver, variability, which is in agreement with our results.…”

“…Manual tracking is the only way to keep the SV exactly within the segment of interest, but this method is time consuming and care is needed to avoid artifacts when manually adjusting the position of the SV. 27 Our study showed that there was a significant effect of sampling method on measurement variability and manual tracking of the SV resulted in the lowest total replication variance of s 0 , e 0 and a 0 . Although the post-hoc comparison between methods failed to verify a difference between methods, the p-values were just above the significance level (p ¼ 0.052e0.075).…”

“…Coefficients of variations were considered clinically acceptable if <10%. 26,27 All analyses were done using the statistical software R g and p-values were assessed at a 5% significance level.…”

“…27 Inclusion of more patients or the apical segment could potentially have increased the statistical power and resolved the problems with interpretation of results regarding manual tracking. 29 Finally, it must be stressed that use of a different probe or echocardiographic machine from another manufacturer, or changing the frame-rate settings during cTDI recordings may influence the optimal settings for off-line analyses 28 ; this should be taken into consideration by other groups working with cTDI.…”

Cardiac Adaptation of the Maternal Heart During Pregnancy: A Color-Coded Tissue Doppler Imaging Study – Feasibility, Reproducibility and Course during Pregnancy

“…Tissue velocity measurements were performed offline using the Echopac PC software incorporated in the Vivid 7 Ultrasound system. As previously reported by our group, we used the tracking method to obtain myocardial velocities [18,19]. No angle correction was applied and data sets with angles greater than 30°between the ultrasound beam and the myocardial wall were excluded.…”