Retrospective ECG-gated Spiral MDCT of Aortic Valve

Subjects underwent retrospectively ECG-gated spiral MDCT of the aortic valve region (Somatom Definition Flash, Siemens, Forchheim, Germany). The CT protocol was as follows: tube voltage 100 kV, tube current 320 mAs, pitch 0.23, temporal resolution 75 ms, collimation 2 × 2 × 64 × 0.6 mm. The CM injection protocol included 120 ml of CM (Iopromide, Ultravist 300, Bayer, Berlin, Germany): 20 ml of CM and 15 ml of saline were injected as a test bolus, followed by 75 ml pure CM, 50 ml 50 % CM solution and finally a 50-ml saline flush, all injected at a rate of 7.2 ml/s. Images were reconstructed (0.75 mm slice thickness, 0.7 mm increment, B26f kernel) at 11 time points of the R–R interval: at 20 ms after the R wave and at every 10 % of the R–R interval.

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Jurencak T., Turek J., Kietselaer B.L., Mihl C., Kok M., van Ommen V.G., van Garsse L.A., Nijssen E.C., Wildberger J.E, & Das M. (2015). MDCT evaluation of aortic root and aortic valve prior to TAVI. What is the optimal imaging time point in the cardiac cycle?. European Radiology, 25(7), 1975-1983.

Publication 2015

Somatom Definition Flash Ultravist 300

Aortic valve Ct protocol Flush Iopromide Mdct Saline Ultravist 300

Corresponding Organization : Maastricht University

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Protocol cited in 4 other protocols

Variable analysis

independent variables

Tube voltage (100 kV)
Tube current (320 mAs)
Pitch (0.23)
Injection protocol (120 ml of CM, including 20 ml of CM and 15 ml of saline as a test bolus, followed by 75 ml pure CM, 50 ml 50% CM solution, and a 50-ml saline flush, all injected at a rate of 7.2 ml/s)

dependent variables

ECG-gated spiral MDCT images of the aortic valve region

control variables

Temporal resolution (75 ms)
Collimation (2 × 2 × 64 × 0.6 mm)
Image reconstruction (0.75 mm slice thickness, 0.7 mm increment, B26f kernel)
11 time points of the R–R interval (at 20 ms after the R wave and at every 10% of the R–R interval)

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