- Poster presentation
- Open Access
Use of a 3D respiratory navigated IR-FLASH sequence after gadofosveset in the pediatric and adult congenital population
© Whitehead et al.; licensee BioMed Central Ltd. 2014
- Published: 16 January 2014
- Bicuspid Aortic Valve
- Metal Artifact
- Aortic Valve Disease
- Isotropic Voxels
- Truncus Arteriosus
While CMR has become instrumental in imaging complex congential heart disease (CHD), limitations remain including significant flow and metal artifact on cine images. 2D dark blood imaging generally requires gating to diastole which may not capture the maximal vessel dimensions, is time consuming and dependent on precise plane positioning. Traditional 3D whole heart sequences are also sensitive to flow and metal artifact. 3D respiratory navigated FLASH with an inversion recovery pulse (IR-FLASH) post-gadofosveset potentially overcomes all of these limitations. Furthermore, it is ideal for generating high resolution isotropic datasets of the blood pool for 3D modeling. We present our experience with IR-FLASH for imaging native and repaired CHD.
We retrospectively reviewed our experience with IR-FLASH after gadofosveset. Respiratory navigating was employed with typical settings including isotropic voxels of 1.0 to 1.3 mm, TE 1.6 msec, TI 260 msec, and flip angle of 18 degrees. The TI was lowered to as low as 140 for systolic gating. Late systolic or diastolic quiescence was chosen for cardiac gating. We compared the IR-FLASH sequence to dynamic MRA, cine, and SSFP whole heart imaging when available.
IR-FLASH after gadofosveset can be routinely implemented in a wide range of heart disease. It is less sensitive to flow and metal artifact than SSFP sequences. It can be reliably gated to both systole and diastole. Gating to systole allows for better definition of semilunar valve morphology, RVOT morphology, and maximal root dimensions. The high resolution, contrast, and ability to scan with isotropic voxels makes it ideal for generating 3D models for computational analysis or printing.
This article is published under license to BioMed Central Ltd. This is an Open Access article distributed under the terms of the Creative Commons Attribution License (http://creativecommons.org/licenses/by/2.0), which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited. The Creative Commons Public Domain Dedication waiver (http://creativecommons.org/publicdomain/zero/1.0/) applies to the data made available in this article, unless otherwise stated.