Iterative reconstruction improves evaluation of native aortic and mitral valves by retrospectively ECG-gated thoracoabdominal CTA

作者：Willemink Martin J^*; Habets Jesse; de Jong Pim A; Schilham Arnold M R; Mali Willem P Th M; Leiner Tim; Budde Ricardo P J

来源：European Radiology, 2013, 23(4): 968-974.

DOI：10.1007/s00330-012-2673-1

• Aortic valve
• Mitral valve
• Computed tomography
• Iterative reconstruction
• Computed tomography angiography

To compare native aortic (AV) and mitral valve (MV) image quality on limited-dose retrospectively ECG-gated CTA of the thoracoabdominal aorta reconstructed with iterative reconstruction (IR) and filtered back projection (FBP).
Fifty patients underwent routine care retrospectively ECG-gated thoracoabdominal limited-dose 256-slice CTA. At 30 % (systole) and 75 % (diastole) of the R-R interval AV and MV were reconstructed using FBP and IR. Objective image quality [density and noise (SD of density measurement)] was measured. Two independent observers scored subjective valve image quality using four-point Likert scales.
IR significantly decreased image noise, but did not alter the aorta and interventricular septum density. Interobserver variability was moderate to good. Valve image quality was scored at least moderate in most cases. IR scored one or two Likert scale points higher than FBP in 10 (first observer) and 27 (second observer) scores. Conversely, IR scored one Likert scale point lower than FBP in 1 (first observer) and 4 (second observer) scores.
Limited-dose retrospectively ECG-gated thoracoabdominal CTA enables moderate to excellent evaluation of AV and MV in most patients, in addition to the primary diagnostic question. Image quality is further improved by IR.
aEuro cent Thoracoabdominal computed tomographic angiography demonstrates both the aortic and mitral valves.
aEuro cent Iterative reconstruction decreases image noise and increases the SNR/CNR of thoracoabdominal CTA.
aEuro cent Limited-dose retrospectively gated CTA enables moderate-excellent left-sided valvular evaluation.
aEuro cent Iterative CT image reconstruction improves subjective native aortic and mitral valvular evaluation.

• 出版日期2013-4