Peake E, et al. - Because of their durability and robustness, urethane-based test objects are routinely used for ultrasound quality assurance, researchers proposed a correction method to determine the effect of temperature on low-contrast penetration measurement in urethane phantoms. They developed the method utilizing a range of 17 transducer geometry and frequency combinations across 5 ultrasound systems and validated utilizing a further 5 systems. This was found to lessen the uncertainty of low-contrast penetration measurement from an average 17.6mm to 4.9mm over the temperature range 8°C to 32°C. This signifies a more than threefold improvement in the measurement of low-contrast penetration precision.