Article Figures & Data
Figures
- Fig 1.
The smallest of the basal ganglia nuclei can be delineated on appropriate T2-weighted imaging through a region just cephalad to the midbrain. The subthalamic nucleus, a frequent target for deep brain stimulation, is outlined by arrows on the patient's right.
- Fig 2.
Tests on a volunteer subject show decreasing anatomic detail of the subthalamic region with decreasing SAR. T2-weighted images obtained with an SAR = 0.1 W/kg and 0.4 W/kg were deemed insufficient for stereotaxis by consensus view between the neuromodulation neurosurgeon and neuroradiologist, while images obtained with an SAR of 0.7 W/kg were adequate for intraoperative stereotaxis.
- Fig 3.
SAR deposition was significantly lower on the Aera system for both MPRAGE (P = .01) (A) and T2-weighted images (P = .03) (B). On the Aera system, all patients were imaged by using an SAR < 1 W/kg, and the SAR SD was small: ±0.02 and ±0.09 W/kg for MPRAGE and T2-weighted images, respectively.
- Fig 4.
A, Susceptibility from the electrode was very minimal within the adjacent brain parenchyma on T2-weighted images (arrow). B, Device-related local susceptibility in the scalp at the site of electrode entry was seen in most cases on the MPRAGE sequence and was not thought to affect image quality. Additionally, a minority of cases showed artifacts likely attributable to stimulated echoes arising from peripheral fat on MPRAGE images only (arrowhead). Overall, all images were judged to be adequate for presurgical guidance.
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