Phantom validation of 7T SASHA sequence T1s against inversion-recovery-spin-echo (IR-SE) reference values in a phantom comprising tubes of NiCl2-doped agar and carrageenan. Reference data were acquired in a 32-channel head coil (Nova Medical) to ensure sufficient B1+ for reliable inversion across the phantom. 7T SASHA data were acquired using the 8-element cardiac coil. For FLASH readout flip angles <20°, the 7T SASHA T1s are within 6% of the IR-SE reference T1s. Spin echo (SE) reference T2s were 50-300ms in this phantom.