Towards ultrasound travel time tomography for quantifying human limb geometry and material properties
Sound speed inversions made using simulated time of flight data from a numerical limb-mimicking phantom comprised of soft tissue and a bone inclusion demonstrate that wave front tracking forward modeling combined with 𝐿1 regularization could lead to accurate estimates of bone sound-speed. Ultrasonic...
| Main Authors: | , , , , |
|---|---|
| Other Authors: | |
| Format: | Article |
| Published: |
SPIE
2018
|
| Online Access: | http://hdl.handle.net/1721.1/114752 https://orcid.org/0000-0001-5112-9718 https://orcid.org/0000-0001-7649-9539 https://orcid.org/0000-0002-3130-8337 |
| Summary: | Sound speed inversions made using simulated time of flight data from a numerical limb-mimicking phantom comprised of soft tissue and a bone inclusion demonstrate that wave front tracking forward modeling combined with 𝐿1 regularization could lead to accurate estimates of bone sound-speed. Ultrasonic tomographic imaging of limbs has the potential to impact prosthetic socket fitting, as well as detect and track muscular dystrophy diseases, osteoporosis and bone fractures at low cost and without radiation exposure. Research in ultrasound tomography of bones has increased in the last 10 years, however, methods delivering clinically useful sound-speed inversions are lacking. Inversions for the sound-speed of the numerical phantoms using 𝐿1 and 𝐿2 regularizations are compared using wave front forward models. The simulations are based on a custom-made cylindrically-scanning tomographic medical ultrasound system (0.5 – 5 MHz) consisting of two acoustic transducers capable of collecting pulse echo and travel time measurements over the entire 360° aperture. Keywords: Ultrasound tomography, bone, migration, reverse time migration |
|---|