Clin Res Cardiol (2022). https://doi.org/10.1007/s00392-022-02002-5 |
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Standardized Weight and Heart Rate based Acquisition Protocol for coronary CT angiography (WRAP-Protocol) | ||
S. Hoepffner1, M. Eckstein2, S. Smolka1, D. Bittner1, F. Ammon1, M. Moshage1, S. Achenbach1, M. Marwan1 | ||
1Med. Klinik 2 - Kardiologie, Angiologie, Universitätsklinikum Erlangen, Erlangen; 2Pathologisches Institut, Friedrich-Alexander Universität Erlangen-Nürnberg, Erlangen; | ||
Introduction:
Out of 630 patients, 215 were excluded from the protocol. Furthermore 30 patients were documented as protocol deviation. 381 patients (mean age 59 ± 10 years, 56% males, mean heart rate 60±10 bpm, mean weight 82±16 kg) were included in this analysis. Acquisition was performed using prospective axial trigger at 70% of the peak R-wave to R-wave, prospective axial trigger at 60-70% or prospective axial acquisition using absolute delay at 250-350 ms following R-wave, in 298 (median heart rate 57 bpm), 40 (median 68 bpm) and 43 patients (median 78 bpm), respectively with acquisition parameters set at 90kV/600 mAs in the majority of patients (267 patients). Using a conversion factor of 0.017, the median estimated effective radiation dose for the 3 arms 90kV/600 mAs, 100 kV/600 mAs and 120 kV/500 mAs was (2/2.9/3.2 mSv, 2.8/4.5/4.2 mSv and 4.1/7.1/6 mSv for the arms 60%/60-70%/250-350 ms, respectively, p< 0.05 for all). In 26 patients (7%), repeat CT angiography was necessary due to artifacts and was most common in the arm with axial acquisition at only 70% of the peak R-wave to-R-wave (17 patients compared to 7 patients for 60-70% and 2 patients for 250-350 ms p< 0.05). In 18 patients (4%), at least one coronary segment was deemed as non-assessable (stratified according to the arms 70%/60-70%/250-350 ms 8, 3 and 7 patients respectively). Using cumulative frequency assessment, coronary segments with major artifacts or deemed non-assessable were most frequently reported in patients with heart rate > 70 bpm or patients with weight > 100 kg.
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https://dgk.org/kongress_programme/jt2022/aP1228.html |