Douglas Lewis

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Hearing loss may affect all age groups from the newborn to the elderly, impacting speech and language development in children and causing social and vocational problems for adults. Hearing loss can arise from anywhere in the auditory circuit including the external auditory canal, sound conduction mechanism, cochlea, cochlear nerve, and central auditory(More)
This study investigates the impact of imaging coil length and consequent truncation of the arterial input function on the perfusion signal contrast obtained in the flow-sensitive alternating inversion recovery (FAIR) perfusion imaging measurement. We examined the difference in perfusion contrast achieved with head, head and neck, and body imaging coils(More)
The purpose of this study was to investigate how flow affects slice-selective excitation, particularly for radiofrequency (rf) pulses optimized for slice-selective excitation of stationary material. Simulation methods were used to calculate the slice profiles for material flowing at different velocities, using optimal flow compensation when appropriate.(More)
AIMS This study aimed to evaluate the performance of ethyl glucuronide (EtG) in hair and fingernails as a long-term alcohol biomarker. DESIGN Cross-sectional survey with probability sampling. SETTING Midwestern United States. PARTICIPANTS Participants were 606 undergraduate college students between the ages of 18 and 25 years at the time of selection(More)
BACKGROUND Heroin abuse is a significant public health issue and is on the rise because of the unintended consequences of strengthening controls for nonmedical use of prescription pain killers. Included in this trend is an increase in opiate exposed newborns that are particularly vulnerable to a number of negative health outcomes. METHODS After presenting(More)
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