A Method of Correcting for the Effect of Temperature on Low-Contrast Penetration Measurement in Urethane Phantoms
Published in Ultrasound in Medicine and Biology, 2019
Recommended citation: Peake, E., Warrington, S., Dudley, N.J., Morgan, P.S., and Gibson, N.M. (2019) “A Method of Correcting for the Effect of Temperature on Low-Contrast Penetration Measurement in Urethane Phantoms”, Ultrasound in Medicine and Biology, vol. 45, no. 6. https://www.umbjournal.org/article/S0301-5629(19)30079-1/abstract
Abstract: Urethane-based test objects are routinely used for ultrasound quality assurance because of their durability and robustness. The acoustic properties of these phantoms including speed of sound and attenuation, however, have a strong dependence on temperature. Reliable measurement of low-contrast penetration, which is widely used for ultrasound system quality assurance testing, with these phantoms is therefore problematic. To alleviate this, a correction method was proposed using speed of sound estimated by measuring filament target separation. The method was developed using a range of 17 transducer geometry and frequency combinations across 5 ultrasound systems and validated using a further 5 systems. This was found to reduce the uncertainty of low-contrast penetration measurement from an average 17.6 mm to 4.9 mm over the temperature range 8°C to 32°C. This represents a greater than threefold improvement in precision of low-contrast penetration measurement.