Table 2:

Quantitative analysis^a

	Non-SEMAR	SEMAR	P Value
Severity of metallic artifacts
SD around DBS electrodes (HU)	28.3 ± 9.1	9.8 ± 3.2	<.01
Artifact index (HU)	28.0 ± 9.2	9.0 ± 3.5	<.01
Background image quality
GM-WM contrast (HU)	11.7 ± 2.7	11.6 ± 2.4	.35
Image noise (HU)	3.8 ± 0.7	3.7 ± 0.7	.17
CNR	3.2 ± 1.0	3.2 ± 0.8	.65

Note:—CNR indicates contrast-to-noise ratio; HU, Housfield unit.

^aData are means.