Academic radiology
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Subject motion is well recognized as a significant impediment to resolution and sensitivity in functional magnetic resonance imaging (fMRI). A parallel confounder to fMRI data quality is geometric image distortion, particularly at high field strengths, due to susceptibility-induced magnetic field inhomogeneity. Consequently, many high-field echo-planar imaging methods incorporate a post-processing distortion correction by acquiring a field map of the sample prior to the fMRI measurement. However, field mapping methods impose a spatial mask on the data, since field information is only obtainable from regions with adequate signal-to-noise ratio (SNR). This masking, when applied to subsequent images in the fMRI time series, can clip the effects of motion, resulting in inaccurate estimation and correction of motion-based changes in the images. ⋯ It is preferable to perform motion realignment prior to correcting for geometric distortion.
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Comparative Study
Blended learning in medical education: use of an integrated approach with web-based small group modules and didactic instruction for teaching radiologic anatomy.
To describe the development of and assess student satisfaction with a blended learning method for teaching radiologic anatomy that integrates web-based instruction with small group and didactic teaching. ⋯ An integration of computers with small and large group didactic instruction allow optimal use of faculty, conform to accepted theories of adult learning, and are well-accepted by students.