1. Treatment Planning Based On CBCT Images Acquired for On-line Position Verification

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    from AAPM / Added

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    2010 AAPM Annual Meeting Dr Daniel Letourneau, PhD, Princess Margaret Hospital, Toronto, ON, M5G 2M9 For more information about the American Association of Physicists in Medicine, visit http://www.aapm.org/ The primary purpose of in-room CBCT volumetric 3D verification images is to verify patient position and target localization in real-time. However, they are also used for clinical treatment evaluation or plan modification for adaptive radiation therapy. Daily positioning variation, organ deformation, or tumor shrinkage incur variations in delivered doses to targets as well as critical structures. The evaluation plan calculated based on the verificationCBCT images presents the actual dosimetric information with the patient anatomy and position achieved just before the treatment, thus,representing the actual or near treatment delivery. Unlike helical CT, CBCT involves drawbacks such as limited field-of-view and artifacts affecting accuracy and reproducibility of HU linearity and homogeneity. Studies have shown that CBCT images are being used in volumetric dose calculations for the purpose of evaluation planning and the purpose of planning or adaptive re-planning. Nevertheless, the in-room CBCT is still not optimized for treatment planning purpose and whether CBCT can provide accurate dose calculation results is limited within certain conditions. Such conditions should be addressed for proper use of CBCT in treatment planning. Limitations related to field-of-view and image quality should be emphasized to ensure accuracy and quality in clinical practices. In order to properly and safely utilize the verification in-room CBCT for treatment planning, users should be aware of limitations and concerns of using CBCT for dose calculation. Users also should perform a set of tests to validate use of CBCT for dose calculation and understand the limits for the applications. This session will review the needs of CBCT-based dose calculation for plan evaluation and plan modification first. Following presentations will present the current status, limitation and concerns of CBCT-based dose calculation for currently available commercial CBCT systems. Learning objectives: To understand 1. needs of CBCT-based dose calculation – plan evaluation and/or plan generation modification for adaptive radiation therapy 2. the current status of CBCT image quality and artifacts, and their impact on CBCT-based dose calculation accuracy 3. limitations and concerns in clinical practice 4. future possibilities of in-situ dose calculation.

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    • LeTourneau Carryall

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      from Don LeTourneau / Added

      289 Plays / / 1 Comment

      This movie is courtesy of Malcolm Morrison from New Zealand. It is a low quality transfer of an old black and white film of the LeTourneau Carryall.

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      • LeTourneau L-1150 wheel loader.

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        from Kodachrome 64 / Added

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        The LeTourneu L-1150 wheel loader is a synergy of class-leading performance and productivity, an all-new fuel-efficient hybrid drive and a commitment to reduce the impact on the environment. Filmed in Queensland, Australia.

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        • Making Beautiful Places for the Glory of God

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          from CenterFaithWork / Added

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          Bob Walker was 13 years old when he heard R.G. LeTourneau speak about being God's businessman. It was then and there that Bob felt the call to business. Today, Bob is president of Walker Mowers, but God is the Senior Partner—and has been since Bob's father started Walker Manufacturing Company on the family farm in Kansas. Since 1980, Walker has focused on designing, developing and producing a line of compact, commercial-grade riding mowers and attachments. In 2008, the 100,000th mower came off the line in their 216,000 square-foot manufacturing facility in Ft Collins, Colorado. Walker mowers can be seen on the lawns of castles in Europe, parks Down Under, international State Houses and exclusive properties throughout North America. But most often they're used by family-owned mowing businesses around the globe. Ingenuity, excellence, integrity, gratitude, stewardship and multiplying opportunity guide Walker Mower as they seek not just to make lawn mowers, but to create beautiful places for the glory of God. Questions to contemplate and discuss about this video can be found here: http://centerforfaithandwork.com/lear... For more free resources about Faith & Work: http://centerforfaithandwork.com/

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          • Follow, This Time.

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            from EventHorizonSurfer / Added

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            An old project I finally decided to finish. All underwater footage is shot off the west coast of Barbados on a GoPro 960 at 480p in order to shoot at 60fps so quality is lacking. Time-lapses are shot with Canon 300D in Vancouver, Canada. Music credit: me.

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            • Texas Piney Woods Realty Website Overview

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              from Chris Loewer / Added

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              This is a presentation of a website created for Frank and Norma Galloway as part of LeTourneau University's 2014 Web Development class. This describes the basic functionality of the website.

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              • Kelvin Wake Pattern

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                from EventHorizonSurfer / Added

                90 Plays / / 0 Comments

                Cruising B.C. on the bikes. Music: Blues Music by G. Love and Special Sauce

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                • Chris and Ashley

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                  from Josh Bauer Wedding / Added

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                  Sept 19 2010 Chris and Ashley Letourneau wedding. Shot in Britannia Beach Squamish Bc

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                  • LeTourneau University NIFA Team-Regionals 2009

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                    from Stestedt / Added

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                    LeToureau University's "Sting" Precision Flight Team takes first place at the regional competition hosted by Delta State

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                    • Something's Here

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                      from Chris / Added

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                      Something's Here; A silent film spoof. Filmed on the campus of LeTourneau University. Shot over spring break 2011 by some very bored college students. Alien: Carmen Willcox Guy at Computer: Chris Schultz Computer Tech: David Wright Monk: David Wright Guy in Burqa: Joshua VanLeer Camera: David Wright, Chris Schultz Edited by Chris Schultz Edited in Sony Vegas Movie Studio 9 Music: A Forgotten Promise by Zero-project http://www.jamendo.com/en/album/104742

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