Field Evaluation of the AIUM Standard 100 mm Test Object

Erikson, K. R.; Carson, Paul L.; Stewart, Harold F.

doi:10.1007/978-1-4613-4307-3_106

Cited by 5 publications

(1 citation statement)

References 0 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…The American Institute of Ultrasound in Medicine (AIUM) test object [32] was used to evaluate thermal effects on the Terason 2000 transducer itself. The CBE from a wire in the test object over the time of a typical experiment was < ±0.1 dB at a constant temperature.…”

Section: Nonthermal and Unwanted Thermal Effectsmentioning

confidence: 99%

Temperature dependence of ultrasonic backscattered energy in motion compensated images

Arthur

Trobaugh

Straube

et al. 2005

IEEE Trans. Ultrason., Ferroelect., Freq. Contr.

View full text Add to dashboard Cite

Noninvasive temperature imaging would enhance the ability to uniformly heat tumors at therapeutic levels. Ultrasound is an attractive modality for this purpose. Previously, we predicted monotonic changes in backscattered energy (CBE) of ultrasound with temperature for certain subwavelength scatterers. We also measured CBE values similar to our predictions in bovine liver, turkey breast, and pork muscle in one dimension (1-D). Those measurements were corrected manually for changes in the axial position of echo signals with temperature. To investigate the effect of temperature on CBE in 2-D, we imaged 1cm thick samples of bovine liver, turkey breast, and pork muscle during heating in a water bath. Images were formed by a phased-array imager with a 7 MHz linear probe. Using radio frequency (RF) signals permitted the use of cross correlation as a similarity measure for automatic tracking of feature displacement as a function of temperature. Feature displacement across the specimen was nonuniform with typical total displacements of 0.5 mm in both axial and lateral directions. Apparent movement in eight image regions in each specimen was tracked from 37 to 50 C in 0.5 C steps. Envelopes of motion-compensated image regions were found then smoothed with a 3 3 running average filter before forming the backscattered energy at each pixel. Our measure of CBE compared means of both the positive and negative changes in the backscattered energy (BE) images. CBE was monotonic and differed by about 4 dB at 50 C from its value at 37 C. Relatively noise-free CBE curves from tissue volumes of less than 1 cm 3 supports the use of CBE for temperature estimation.

show abstract

Section: Nonthermal and Unwanted Thermal Effectsmentioning

confidence: 99%

Temperature dependence of ultrasonic backscattered energy in motion compensated images

Arthur

Trobaugh

Straube

et al. 2005

IEEE Trans. Ultrason., Ferroelect., Freq. Contr.

View full text Add to dashboard Cite

show abstract

Biological effects of ultrasound: development of safety guidelines

Nyborg

2000

Ultrasound in Medicine & Biology

View full text Add to dashboard Cite

In vivochange in ultrasonic backscattered energy with temperature in motion-compensated images

Arthur

Straube

Trobaugh

et al. 2008

International Journal of Hyperthermia

View full text Add to dashboard Cite

Ultrasound is an attractive modality for non-invasive imaging to monitor temperature of tumorous regions undergoing hyperthermia therapy. Previously, we predicted monotonic changes in backscattered energy (CBE) of ultrasound with temperature for certain sub-wavelength scatterers. We also measured CBE values similar to our predictions in bovine liver, turkey breast muscle, and pork rib muscle in both 1D and 2D in in vitro studies. To corroborate those results in perfused, living tissue, we measured CBE in both normal tissue and in implanted human tumors (HT29 colon cancer line) in 7 nude mice. Images were formed by a phased-array imager with a 7.5 MHz linear probe during homogeneous heating from 37 degrees to 45 degrees C in 0.5 degrees C steps and from body temperature to 43 degrees C during heterogeneous heating. We used cross-correlation as a similarity measure in RF signals to automatically track feature displacement as a function of temperature. Feature displacement was non-uniform with a maximum value of 1 mm across all specimens during homogeneous heating, and 0.2 mm during heterogeneous heating. Envelopes of image regions, compensated for non-rigid motion, were found with the Hilbert transform then smoothed with a 3 x 3 running average filter before forming the backscattered energy at each pixel. Means of both the positive and negative changes in the BE images were evaluated. CBE was monotonic and accumulated to 4-5 dB during homogeneous heating to 45 degrees C and 3-4 dB during heterogenous heating to 43 degrees C. These results are consistent with our previous in vitro measurements and support the use of CBE for temperature estimation in vivo during hyperthermia.

show abstract

Field Evaluation of the AIUM Standard 100 mm Test Object

Cited by 5 publications

References 0 publications

Temperature dependence of ultrasonic backscattered energy in motion compensated images

Temperature dependence of ultrasonic backscattered energy in motion compensated images

Biological effects of ultrasound: development of safety guidelines

In vivochange in ultrasonic backscattered energy with temperature in motion-compensated images

Contact Info

Product

Resources

About