WE-G-220-06: Using MR-Guided Focused Ultrasound to Study Heating Pattern Variations Due to Reflections from Interfaces in Both Thermal and Tissue Phantoms

2011 ◽  
Vol 38 (6Part34) ◽  
pp. 3838-3838
Author(s):  
E Hipp ◽  
X Fan ◽  
A Partanen ◽  
G Karczmar
Keyword(s):  
Focused Ultrasound ◽  
Tissue Phantoms ◽  
Heating Pattern

Doppler ultrasound detection of shear waves remotely induced in tissue phantoms by focused ultrasound

2000 ◽  
Vol 108 (5) ◽  
pp. 2549-2550 ◽  
Author(s):  
Evgen A. Barannik ◽  
Sergii A. Girnyk ◽  
Volodymyr V. Tovstiak ◽  
Armen P. Sarvazyan
Keyword(s):  
Doppler Ultrasound ◽  
Focused Ultrasound ◽  
Shear Waves ◽  
Tissue Phantoms

scholarly journals Ultrasound Modulation of Diffusive Optical Waves for Medical Imaging

2000 ◽  
Author(s):  
Daniel J. Townsend ◽  
Jonathan J. Stott ◽  
Ronald A. Roy ◽  
Charles A. DiMarzio
Keyword(s):  
Medical Imaging ◽  
Focused Ultrasound ◽  
Optical Tomography ◽  
The Body ◽  
Experimental Results ◽  
New Technique ◽  
Physical Limitation ◽  
Tissue Phantoms ◽  
Ultrasound Modulation ◽  
A New Technique

Abstract Diffusive optical tomography [DOT] is a technique for imaging within the body. While DOT provides excellent results under good conditions, there are many situations (due to anatomy or other physical limitation) in which it suffers from a “limited view” problem. In this paper we discuss our work on a new technique for combining DOT with focused ultrasound to generate virtual sources of illumination. These virtual sources help overcome the limited view problem. We present our experimental results using laboratory tissue phantoms.

Reduction in Beam Positioning Error During HIFU Ablation Studies in Tissue Phantoms

2010 ◽  
Author(s):  
Subhashish Dasgupta ◽  
Prasanna Hariharan ◽  
Matthew R. Myers ◽  
Rupak K. Banerjee
Keyword(s):  
Blood Flow ◽  
Iterative Method ◽  
Temperature Rise ◽  
Focused Ultrasound ◽  
High Intensity Focused Ultrasound ◽  
Measured Temperature ◽  
Positioning Error ◽  
Tissue Phantoms ◽  
Order Of Magnitude ◽  
Source Of Error

Measurements of high intensity focused ultrasound (HIFU) induced temperature rise using thermocouples in tissue phantoms are subject to several types of error which must be accounted for in order to accurately assess the thermal field and predict the outcome of clinical procedures. Thermocouple artifacts due to viscous heating is one source of error. A second source of error involves displacement of the beam relative to the targeted thermocouple junction, due to the difficulty in precisely positioning the very narrow beam. This paper presents an iterative method for removing inaccuracies due to positioning error from the measured temperature data. The refined data is used to quantify the effect of blood flow through large vessels on the efficacy of HIFU procedures. It was determined that blood flow cooling effect causes an order of magnitude decrease in thermal dose at the target within 2 mm of the blood vessel, potentially resulting in incomplete ablation of the tumor. The technique also reveals that thermocouple artifacts exist in significant proportions from about 0.5 to 2.2 times the computed temperature rise in the initial few seconds. The iterative method can aid in clinical procedure planning, especially in predicting the proper HIFU intensity and duration for complete destruction of tumors.

Visuomotor Transformations Are Modulated by Focused Ultrasound over Frontal Eye Field

2020 ◽  
Author(s):  
Kaleb A. Lowe ◽  
Wolf Zinke ◽  
M. Anthony Phipps ◽  
Josh Cosman ◽  
Micala Maddox ◽  
...  
Keyword(s):  
Focused Ultrasound ◽  
Frontal Eye Field ◽  
Visuomotor Transformations ◽  
Eye Field

260: High Intensity Focused Ultrasound Combined with Endocrine Therapy in Treating High or Intermediate Risk Prostate Cancer

2006 ◽  
Vol 175 (4S) ◽  
pp. 86-86
Author(s):  
Makoto Sumitomo ◽  
Junichi Asakuma ◽  
Yasumasa Hanawa ◽  
Kazuhiko Nagakura ◽  
Masamichi Hayakawa
Keyword(s):  
Prostate Cancer ◽  
Endocrine Therapy ◽  
High Intensity ◽  
Focused Ultrasound ◽  
High Intensity Focused Ultrasound ◽  
Intermediate Risk ◽  
Risk Prostate Cancer

1400: Early Clinical Experience Using High-Intensity Focused Ultrasound for the Treatment of Renal Tumours

2005 ◽  
Vol 173 (4S) ◽  
pp. 379-380
Author(s):  
James E. Kennedy ◽  
Rowland O. Illing ◽  
Feng Wu ◽  
Gail R. ter Haar ◽  
Rachel R. Phillips ◽  
...  
Keyword(s):  
Clinical Experience ◽  
High Intensity ◽  
Focused Ultrasound ◽  
High Intensity Focused Ultrasound ◽  
Early Clinical Experience ◽  
Renal Tumours
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