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Superior view of thermoplastic facemask worn by all subjects in both magnetic resonance imaging (MRI) and single-photon emission-computed tomography (SPECT) to stabilize head in the desired position. Photograph provided courtesy of Dr. Wichana Chamroonrat, Division of Nuclear Medicine, The Russell H. Morgan Department of Radiology and Radiological Science, School of Medicine, The Johns Hopkins University School of Medicine, Baltimore, Maryland.
