Clinical Evaluation of Scout Accelerated Motion Estimation and Reduction Technique for 3D MR Imaging in the Inpatient and Emergency Department Settings

Sagittal T1 MPRAGE images illustrating examples of cases with motion artifacts (grades I–5) for which SAMER reconstruction improved motion by 1 grade. A, A 23-year-old woman with a normal brain. B, Postoperative findings from resection of a left parietal lobe tumor in a 59-year-old woman with a history of anaplastic oligodendroglioma. C, Diffuse parenchymal volume loss with disproportionate involvement of the frontal and parietal lobes and, to a lesser extent, the left temporal lobe in a 59-year-old man with history of cognitive impairment. D, An 83-year-old woman with history of chronic cerebral small-vessel disease. E, Expected postoperative changes and enhancement from left temporal parietal craniotomy (arrows) are demonstrated in a 63-year-old man with history of glioblastoma.

Proportion of nondiagnostic and diagnostic examinations that demonstrated worsening, no change, and improvement of motion grade after SAMER correction. Motion grades 1 (no motion), 2 (minimal), and 3 (mild) are considered diagnostic in terms of motion artifacts, whereas motion grades 4 (moderate) and 5 (severe) are considered nondiagnostic in terms of motion artifacts.

Axial MR images of 2 cases with severe motion artifacts (grade 5) in which SAMER motion correction restored diagnostic value (by reducing motion grade to 3). A, The extent of cortical/gyral enhancement (arrows) and edematous expansion of the left temporoparietal region with a mild rightward mass effect is better visualized on the motion-corrected image of a 67-year-old man with traumatic brain injury. B, Motion-corrected image shows better visualization of cortical laminar necrosis in the left occipital lobe (arrows) and better evaluation of left temporal lobe volume loss (arrows) in an 86-year-old woman with history of stroke.

Balloon plot showing the results of the head-to-head comparison of baseline MPRAGE and SAMER motion-corrected MPRAGE studies for pathology conspicuity, pathology sharpness, and evaluation of surrounding anatomy. A total 79 of 97 cases had pathology on imaging and were included in this assessment. The size of the circle correlates to the percentage of cases assigned a given score, and the percentage of cases receiving a given score is indicated below each circle. A zero score indicates equivalency, negative scores (left) favor baseline MPRAGE images, and positive scores (right) favor SAMER motion-corrected MPRAGE images.