More articles from BRAIN
- Imaging the Effects of Oxygen Saturation Changes in Voluntary Apnea and Hyperventilation on Susceptibility-Weighted Imaging
Cerebral venous oxygenation was assessed during apnea and hyperventilation with SWI in healthy male volunteers. Signal changes were seen during apnea and especially during hyperventilation. Thus, SWI may be a simple noninvasive method to assess cerebral hemodynamics and vasomotor responses.
- Combined Low-Dose Contrast-Enhanced MR Angiography and Perfusion for Acute Ischemic Stroke at 3T: A More Efficient Stroke Protocol
Patients studied for acute stroke were evaluated with full- and half-dose contrast-enhanced neck MRA and brain perfusion imaging and results were compared. Detection specificity and overestimation of stenoses were slightly higher for the half-dose studies but perfusion mismatches were identified with high interobserver agreement at both doses. Thus, low-dose studies are feasible and save time and contrast volume.
- Imaging Findings in MR Imaging–Guided Focused Ultrasound Treatment for Patients with Essential Tremor
This study reports the imaging findings after focused ultrasound ablation of the intermedius nuclei in patients with essential tremor. Fifteen patients received follow-up MRI studies on 4 occasions after treatment. Maximal lesion size and perilesional edema predicted a good outcome and all lesions showed consistent and typical findings in the days, weeks, and months after treatment.