Acoustic radiation force impulse imaging of myocardial radiofrequency ablation: initial in vivo results

Fahey, B.J.; Nightingale, Kathryn R.; McAleavey, Stephen A.; Palmeri, Mark L.; Wolf, Patrick D.; Trahey, Gregg E.

doi:10.1109/tuffc.2005.1428046

Cited by 90 publications

(91 citation statements)

References 59 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…A solution is to implement TGC processing techniques (Fahey et al 2005a) to normalize for gradients in applied radiation force throughout the focal region of the pushing beams. The TGC-processed version of figure 2(h) is shown in figure 2(i).…”

Section: Resultsmentioning

confidence: 99%

“…This technique generally results in improved image contrast and an expanded range of depths over which relative stiffness differences can be visualized. A detailed description of this algorithm has been provided previously (Fahey et al 2005a). TGC-processed images have a scale of relative displacement, as opposed to conventional ARFI images, which have a scale of absolute displacement.…”

Section: Image Processing and Visualizationmentioning

confidence: 99%

See 1 more Smart Citation

Liver ablation guidance with acoustic radiation force impulse imaging: challenges and opportunities

et al. 2006

View full text Add to dashboard Cite

Previous studies have established the feasibility of monitoring radiofrequency (RF) ablation procedures with acoustic radiation force impulse (ARFI) imaging. However, questions remained regarding the utility of the technique in clinically realistic scenarios and at scanning depths associated with abdominal imaging in adults. We address several of these issues and detail recent progress towards the clinical relevance of the ARFI technique. Results from in vitro bovine tissues and an in vivo ovine model are presented. Additional experiments were conducted with a tissue-mimicking phantom and parallel receive tracking techniques in order to further support the clinical feasibility of the method. Thermal lesions created during RF ablation are visualized with high contrast in both in vitro and in vivo hepatic tissues, and radial lesion growth can be monitored throughout the duration of the procedure. ARFI imaging is implemented on a diagnostic ultrasonic scanner, and thus may be a convenient option to guide RF ablation procedures, particularly when electrode insertion is also performed with sonographic guidance.

show abstract

Section: Resultsmentioning

confidence: 99%

Section: Image Processing and Visualizationmentioning

confidence: 99%

Liver ablation guidance with acoustic radiation force impulse imaging: challenges and opportunities

et al. 2006

View full text Add to dashboard Cite

show abstract

“…ARFI imaging uses high intensity acoustic pulses to apply local forces to tissue and impart small displacements within selected regions of interest (Nightingale et al, 2001(Nightingale et al, , 2002c. The tissue responses to the radiation force are then tracked and can be correlated with the local stiffness of soft tissue (Fahey et al, 2005b(Fahey et al, , 2004. The radiation force (N/cm 3 ) generated by a propagating acoustic wave is given by (Nyborg, 1965;Torr, 1984):…”

Section: Introductionmentioning

confidence: 99%

“…With uniform stress, the displacement images can be interpreted as a direct reflection of stiffness because the material's elastic modulus and deflection under a given load are inversely related. As a result, ARFI imaging has been shown to be capable of identifying stiffer regions within the image that displace less than more compliant tissue (Fahey et al, 2005b(Fahey et al, , 2004Nightingale et al, 2002aNightingale et al, , 2001Sharma et al, 2004). As ARFI imaging produces its own tissue deformation, it is less affected by the non-uniform stress distribution within the heart.…”

Section: Introductionmentioning

confidence: 99%

See 1 more Smart Citation

In Vivo Assessment of Myocardial Stiffness with Acoustic Radiation Force Impulse Imaging

Hsu¹,

Bouchard²,

Dumont³

et al. 2007

Ultrasound in Medicine & Biology

112

107

View full text Add to dashboard Cite

Acoustic radiation force impulse (ARFI) imaging has been demonstrated to be capable of visualizing variations in local stiffness within soft tissue. Recent advances in ARFI beam sequencing and parallel imaging have shortened acquisition times and lessened transducer heating to a point where ARFI acquisitions can be executed at high frame rates on commercially available diagnostic scanners. In vivo ARFI images were acquired with a linear array placed on an exposed canine heart. The electrocardiogram (ECG) was also recorded. When co-registered with the ECG, ARFI displacement images of the heart reflect the expected myocardial stiffness changes during the cardiac cycle. A radiofrequency ablation was performed on the epicardial surface of the left ventricular free wall, creating a small lesion that did not vary in stiffness during a heartbeat, though continued to move with the rest of the heart. ARFI images showed a hemispherical, stiffer region at the ablation site whose displacement magnitude and temporal variation through the cardiac cycle were less than the surrounding untreated myocardium. Sequences with radiation force pulse amplitudes set to zero were acquired to measure potential cardiac motion artifacts within the ARFI images. The results show promise for real-time cardiac ARFI imaging.

show abstract

Radiation Force

2022

Pressure Oscillation in Biomedical Diagnostics and Therapy

View full text Add to dashboard Cite

Acoustic radiation force impulse imaging of myocardial radiofrequency ablation: initial in vivo results

Cited by 90 publications

References 59 publications

Liver ablation guidance with acoustic radiation force impulse imaging: challenges and opportunities

Liver ablation guidance with acoustic radiation force impulse imaging: challenges and opportunities

In Vivo Assessment of Myocardial Stiffness with Acoustic Radiation Force Impulse Imaging

Radiation Force

Contact Info

Product

Resources

About