Validation of thoracic aortic dimensions on ECG-triggered SSFP as alternative to contrast-enhanced MRA

G J H Snel*, L M Hernandez, R H J A Slart, C T Nguyen, D E Sosnovik, V M van Deursen, R A J O Dierckx, B K Velthuis, R J H Borra, N H J Prakken

*Corresponding author for this work

Research output: Contribution to journalArticleAcademicpeer-review

59 Downloads (Pure)

Abstract

Objectives Assessment of thoracic aortic dimensions with non-ECG-triggered contrast-enhanced magnetic resonance angiography (CE-MRA) is accompanied with motion artefacts and requires gadolinium. To avoid both motion artefacts and gadolinium administration, we evaluated the similarity and reproducibility of dimensions measured on ECG-triggered, balanced steady-state free precession (SSFP) MRA as alternative to CE-MRA. Methods All patients, with varying medical conditions, referred for thoracic aortic examination between September 2016 and March 2018, who underwent non-ECG-triggered CE-MRA and SSFP-MRA (1.5 T) were retrospectively included (n = 30). Aortic dimensions were measured after double-oblique multiplanar reconstruction by two observers at nine landmarks predefined by literature guidelines. Image quality was scored at the sinus of Valsalva, mid-ascending aorta and mid-descending aorta by semi-automatically assessing the vessel sharpness. Results Aortic dimensions showed high agreement between non-ECG-triggered CE-MRA and SSFP-MRA (r = 0.99, p <0.05) without overestimation or underestimation of aortic dimensions in SSFP-MRA (mean difference, 0.1 mm; limits of agreement, - 1.9 mm and 1.9 mm). Intra- and inter-observer variabilities were significantly smaller with SSFP-MRA for the sinus of Valsalva and sinotubular junction. Image quality of the sinus of Valsalva was significantly better with SSFP-MRA, as fewer images were of impaired quality (3/30) than in CE-MRA (21/30). Reproducibility of dimensions was significantly better in images scored as good quality compared to impaired quality in both sequences. Conclusions Thoracic aortic dimensions measured on SSFP-MRA and non-ECG-triggered CE-MRA were similar. As expected, SSFP-MRA showed better reproducibility close to the aortic root because of lesser motion artefacts, making it a feasible non-contrast imaging alternative.

Original languageEnglish
Pages (from-to)5794-5804
Number of pages11
JournalEuropean Radiology
Volume30
Issue number11
DOIs
Publication statusPublished - 7-Jun-2020

Keywords

  • Thoracic aorta
  • Magnetic resonance angiography
  • Reproducibility of results
  • Contrast media
  • Cardiac-gated imaging techniques
  • MAGNETIC-RESONANCE ANGIOGRAPHY
  • CE-MRA
  • ACCURACY
  • DISEASE

Cite this