Please wait, while we are loading the content...
| Content Provider | IEEE Xplore Digital Library |
|---|---|
| Author | Ballard, J.R. Casper, A.J. Ebbini, E.S. |
| Copyright Year | 2008 |
| Description | Author affiliation: Dept. of Electical & Comput. Eng., Univ. of Minnesota, Minneapolis, MN (Ballard, J.R.; Casper, A.J.; Ebbini, E.S.) |
| Abstract | A major advantage of imaging with dual-mode ultrasound arrays (DMUAs) is the inherent registration between imaging and therapeutic coordinate systems during image-guided surgery which allows for image-based feedback for refocusing the therapeutic beam. Specifically, this capability is critical in image-guided thoracic surgeries where the target is partially obstructed by the rib cage, thus limiting the access and distorting the geometrically focused high-intensity focused ultrasound (HIFU) therapeutic beam. Images obtained with single-transmit focus (STF), in which the therapeutic beam is used at diagnostic levels, allow the user to select target and critical locations for optimizing the power deposition. We have developed an optimal refocusing method that takes advantage of the acoustic window of the intercostals spacing in order to minimize the power deposition over the critical regions (ribs) while maintaining or improving the power deposition at the target location (tumor). The algorithm is verified experimentally with a 64-element 1 MHz DMUA, in an attenuating tissue mimicking phantom (0.5 dB/cm/MHz) with embedded Plexiglas ribs. Thermocouples are used to measure sub-therapeutic temperatures across the ribs and at the target location before, during and after 4 seconds of HIFU exposure for both the geometric focusing and the optimized refocusing while normalizing the driving power for both cases. An increase of normalized temperature (per watt of input power) greater than 50% was observed at the target after refocusing. At the same time, a reduction in normalized temperature rise across the ribs was greater than 70%. Statistics showed that the maximum variance between measurements when the experiment was rerun a minimum of 5 times for each case was approximately 5%. In addition, STF images taken with the refocused HIFU beam showed increased echogenicity at the target and reduced echogenicity at the ribs. This can be quantified by the intensity of the grayscale images. These images show a typical reduction of 11dB across the ribs. These results show that imaging of the therapeutic beam at diagnostic levels in STF mode correlates with the energy deposition during HIFU treatment. |
| Starting Page | 1183 |
| Ending Page | 1186 |
| File Size | 2785384 |
| Page Count | 4 |
| File Format | |
| ISBN | 9781424424283 |
| DOI | 10.1109/ULTSYM.2008.0285 |
| Language | English |
| Publisher | Institute of Electrical and Electronics Engineers, Inc. (IEEE) |
| Publisher Date | 2008-11-02 |
| Publisher Place | China |
| Access Restriction | Subscribed |
| Rights Holder | Institute of Electrical and Electronics Engineers, Inc. (IEEE) |
| Subject Keyword | Ultrasonic imaging Ribs Acoustic beams Focusing Surgery Temperature measurement Feedback Acoustic distortion Neoplasms Imaging phantoms Refocusing Dual-Mode Ultrasound Arrays HIFU Therapeutic Ultrasound |
| Content Type | Text |
| Resource Type | Article |
National Digital Library of India (NDLI) is a virtual repository of learning resources which is not just a repository with search/browse facilities but provides a host of services for the learner community. It is sponsored and mentored by Ministry of Education, Government of India, through its National Mission on Education through Information and Communication Technology (NMEICT). Filtered and federated searching is employed to facilitate focused searching so that learners can find the right resource with least effort and in minimum time. NDLI provides user group-specific services such as Examination Preparatory for School and College students and job aspirants. Services for Researchers and general learners are also provided. NDLI is designed to hold content of any language and provides interface support for 10 most widely used Indian languages. It is built to provide support for all academic levels including researchers and life-long learners, all disciplines, all popular forms of access devices and differently-abled learners. It is designed to enable people to learn and prepare from best practices from all over the world and to facilitate researchers to perform inter-linked exploration from multiple sources. It is developed, operated and maintained from Indian Institute of Technology Kharagpur.
Learn more about this project from here.
NDLI is a conglomeration of freely available or institutionally contributed or donated or publisher managed contents. Almost all these contents are hosted and accessed from respective sources. The responsibility for authenticity, relevance, completeness, accuracy, reliability and suitability of these contents rests with the respective organization and NDLI has no responsibility or liability for these. Every effort is made to keep the NDLI portal up and running smoothly unless there are some unavoidable technical issues.
Ministry of Education, through its National Mission on Education through Information and Communication Technology (NMEICT), has sponsored and funded the National Digital Library of India (NDLI) project.
| Sl. | Authority | Responsibilities | Communication Details |
|---|---|---|---|
| 1 | Ministry of Education (GoI), Department of Higher Education |
Sanctioning Authority | https://www.education.gov.in/ict-initiatives |
| 2 | Indian Institute of Technology Kharagpur | Host Institute of the Project: The host institute of the project is responsible for providing infrastructure support and hosting the project | https://www.iitkgp.ac.in |
| 3 | National Digital Library of India Office, Indian Institute of Technology Kharagpur | The administrative and infrastructural headquarters of the project | Dr. B. Sutradhar bsutra@ndl.gov.in |
| 4 | Project PI / Joint PI | Principal Investigator and Joint Principal Investigators of the project |
Dr. B. Sutradhar bsutra@ndl.gov.in Prof. Saswat Chakrabarti will be added soon |
| 5 | Website/Portal (Helpdesk) | Queries regarding NDLI and its services | support@ndl.gov.in |
| 6 | Contents and Copyright Issues | Queries related to content curation and copyright issues | content@ndl.gov.in |
| 7 | National Digital Library of India Club (NDLI Club) | Queries related to NDLI Club formation, support, user awareness program, seminar/symposium, collaboration, social media, promotion, and outreach | clubsupport@ndl.gov.in |
| 8 | Digital Preservation Centre (DPC) | Assistance with digitizing and archiving copyright-free printed books | dpc@ndl.gov.in |
| 9 | IDR Setup or Support | Queries related to establishment and support of Institutional Digital Repository (IDR) and IDR workshops | idr@ndl.gov.in |
|
Loading...
|