A theoretical and experimental investigation on a volume coil with slotted end-rings for rat MRI at 7 T.

Objective: A volume coil with squared slots-end ring was developed to attain improved sensitivity for imaging of rat's brain at 7 T.

Material And Methods: The principles of the high cavity resonator for the low-pass case and the law of Biot-Savart were used to derive a theoretical expression of [Formula: see text]. The slotted-end ring resonator showed a theoretical 2.

Time to a Negative SARS-CoV-2 PCR Predicts Delayed Return to Work After Medical Leave in COVID-19 Infected Health Care Workers.

Objective: To investigate whether HCWs return to work (RTW) after COVID-19 was associated with time to a negative viral detection test.

Methods: To evaluate the association of RTW with an undetectable RT-PCR adjusting for different factors.

Results: Three hundred seventy-five HCWs who required medical leave for COVID-19 at a hospital in Madrid.

Surface coil with reduced specific absorption rate for rat MRI at 7 T.

Objective: A scaled-down slotted surface radio frequency (RF) coil was built, and the specific absorbance rate (SAR) in 100 mg of tissue (SAR100 mg) produced in a rat brain phantom was computed at 7 T.

Materials And Methods: A slotted coil 2-cm in diameter with six circular slots was developed. Its theoretical and experimental performance was computed and compared using the signal-to-noise ratio (SNR) expression and phantom images obtained with a spin echo sequence.