Myocardial late gadolinium enhancement using delayed 3D IR-FLASH in the pediatric population: feasibility and diagnostic performance compared to single-shot PSIR-bSSFP

Table 1 Technical parameters of LGE sequences

CMR parameter	Conventional LGE	3D HR-LGE
Base sequence	Single-shot PSIR-bSSFP	3D IR-FLASH
ECG gating	Mid-late diastole	Cardiac quiescence in systole or diastole
Parallel imaging × acceleration factor	GRAPPA × 2	GRAPPA × 2
Field of view	250–350 mm	250–350 mm
Pixel size	1.8 × 1.8 mm	1.1 × 1.1 to 1.4 × 1.4 mm
Slice thickness	6 mm (no gap)	1.1 to 1.4 mm
Flip angle	40˚	18˚
TR/TE	2.57/1.09 ms	330/1.4 ms
Number of averages	1–3^a	1
Fat saturation	Yes	Yes
Acquisition plane(s)	Axial, short axis	Coronal

ECG electrocardiogram; FLASH fast low angle shot; GRAPPA generalized autocalibrating partial parallel acquisition; IR inversion recovery; PSIR phase-sensitive inversion recovery; bSSFP balanced steady-state free precession; TE time to echo; TR repetition time
^aSmaller patients and those performed under general anesthesia were performed free breathing with more averages to reduce motion artifact and increase signal

ISSN: 1532-429X