Advanced CT acquisition protocol for comprehensive assessment of prosthetic heart valves and the thoracic aorta using dual-source CT and iterative reconstruction

Congress:

ESCR 2015

Poster Number:

P-0008

Type:

Scientific Poster

Keywords:

Imaging sequences, CT-Angiography, CT, Cardiac, Prostheses

Authors:

R. P. J. Budde, M. L. Dijkshoorn, J. Bekkers, L. E. Swart, M. van Straten, K. Nieman, G. P. Krestin; Rotterdam/NL

DOI:

DOI-Link:

https://dx.doi.org/

Fig. 2: Example of CTA reconstruction showing excellent image quality of a bileaflet...

Fig. 3: Example of CTA reconstruction showing non interpretable image quality of the...

Fig. 4: Dynamics of prosthetic valve leaflets. Example of CTA reconstruction in systole...

Fig. 5: Large false aneurysm in the aortic root. Calcifications in the wall of the...

Fig. 6: Value of delayed phase scan. Slow flow in left atrial appendage. Patients with...

Fig. 7: Value of delayed fase scan. In this patient the delayed phase scan confirms the...

Results

Scans of 10 patients with 11 prosthetic heart valves were found and analyzed.

Image quality scores were:

Non contrast enhanced scan: 4.0±1.8*

Contrast enhanced scan: 4.8±0.4

Venous phase scan: 4.2±0.4

Values as mean ± SD; 1=non-interpretable; 5= excellent, *n=9

Figures 2 and 3 illustrate different scores of image quality.

CTDI values and radiation dose were:

Non contrast enhanced scan: 3.33±1.91 mGy

Contrast enhanced scan: 32.45±15.19 mGy

Venous phase scan: 2.53±1.51mGy

Total dose : 8.4±3.8mSv

Values as mean±SD; total dose for n=9, dose info not available in 1 patient, abdomen included in venous phase scan in one patient.

Dynamics of mechanical valve leaflet motion could be succesfully assessed (figure 4). PHV findings included: normal function (n=6), obstruction, leakage or aortic root cavities (n=4), non-assessable (n=1).

The value of the non-contrast enhanced and delayed phase scans are illustrated in figures 5 to 7.