Development and characterization of a tissue-mimicking material for high-intensity focused ultrasound.
IEEE Trans Ultrason Ferroelectr Freq Control
; 58(7): 1397-405, 2011 Jul.
Article
in En
| MEDLINE
| ID: mdl-21768024
ABSTRACT
A tissue-mimicking material (TMM) for the acoustic and thermal characterization of high-intensity focused ultrasound (HIFU) devices has been developed. The material is a high-temperature hydrogel matrix (gellan gum) combined with different sizes of aluminum oxide particles and other chemicals. The ultrasonic properties (attenuation coefficient, speed of sound, acoustical impedance, and the thermal conductivity and diffusivity) were characterized as a function of temperature from 20 to 70°C. The backscatter coefficient and nonlinearity parameter B/A were measured at room temperature. Importantly, the attenuation coefficient has essentially linear frequency dependence, as is the case for most mammalian tissues at 37°C. The mean value is 0.64f(0.95) dB·cm(-1) at 20°C, based on measurements from 2 to 8 MHz. Most of the other relevant physical parameters are also close to the reported values, although backscatter signals are low compared with typical human soft tissues. Repeatable and consistent temperature elevations of 40°C were produced under 20-s HIFU exposures in the TMM. This TMM is appropriate for developing standardized dosimetry techniques, validating numerical models, and determining the safety and efficacy of HIFU devices.
Full text:
1
Collection:
01-internacional
Database:
MEDLINE
Main subject:
Phantoms, Imaging
/
Biomimetic Materials
/
High-Intensity Focused Ultrasound Ablation
Type of study:
Prognostic_studies
Limits:
Humans
Language:
En
Journal:
IEEE Trans Ultrason Ferroelectr Freq Control
Journal subject:
MEDICINA NUCLEAR
Year:
2011
Document type:
Article
Affiliation country: