. Author manuscript; available in PMC: 2020 Nov 1.

Published in final edited form as: Magn Reson Med. 2019 Jun 22;82(5):1660–1670. doi: 10.1002/mrm.27853

Table 2:

Relative contrast between pulmonary arteries and paraspinal muscle at different flip angles

Visit	Method	Flip angle	Rel. contrast (pulm. artery/muscle)	P-Values
1	GD-UTE-MRA	6	1.31	0.0107	<0.001
		12	1.52	0.0107		0.083
		18	1.70			0.083
2	FE-cMRA	6	2.09	<0.001	<0.001	<0.001
		12	2.84	<0.001			0.002	<0.001
		18	3.10				0.002		0.485
		24	3.34						0.485
	FE-UTE-MRA	6	1.82	<0.001	<0.001	<0.001
		12	3,14	<0.001			<0.001	<0.001
		18	4.02				<0.001		<0.001
		24	4.40						<0.001

Relative contrast (means across subjects) between the pulmonary arteries and muscle (surrogate for pulmonary emboli) increases at higher flip angles. The spread of mean relative signal intensity values for pulmonary arteries and muscle is illustrated in Figure 4A.