Spinal Ultrasound Scan Operations: Flight Engineer (FE)-5 Mastracchio, with assistance from FE-6 Wakata and ground experts, performed his Flight Day 90 Spinal Ultrasound session. This investigation aims to characterize microgravity-associated spinal alterations during and after spaceflight using in-flight ultrasound. Results from this research will provide data to enhance crew health for long duration space missions. …