Search Results - "Dempsey, James F"

The ViewRay System: Magnetic Resonance–Guided and Controlled Radiotherapy by Mutic, Sasa, PhD, Dempsey, James F., PhD

“…A description of the first commercially available magnetic resonance imaging (MRI)–guided radiation therapy (RT) system is provided. The system consists of a…”
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Dosimetry tools and techniques for IMRT by Low, Daniel A., Moran, Jean M., Dempsey, James F., Dong, Lei, Oldham, Mark

“…Intensity modulated radiation therapy (IMRT) poses a number of challenges for properly measuring commissioning data and quality assurance (QA) radiation dose…”
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Evaluation of the gamma dose distribution comparison method by Low, Daniel A., Dempsey, James F.

“…The γ tool was developed to quantitatively compare dose distributions, either measured or calculated. Before computing γ, the dose and distance scales of the…”
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Patterns of failure in patients receiving definitive and postoperative IMRT for head-and-neck cancer by Chao, K S Clifford, Ozyigit, Gokhan, Tran, Binh N, Cengiz, Mustafa, Dempsey, James F, Low, Daniel A

“…To analyze the patterns of locoregional failure in patients with head-and-neck cancer treated with inverse planning intensity-modulated radiotherapy (IMRT)…”
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A method for the reconstruction of four-dimensional synchronized CT scans acquired during free breathing by Low, Daniel A., Nystrom, Michelle, Kalinin, Eugene, Parikh, Parag, Dempsey, James F., Bradley, Jeffrey D., Mutic, Sasa, Wahab, Sasha H., Islam, Tareque, Christensen, Gary, Politte, David G., Whiting, Bruce R.

“…Breathing motion is a significant source of error in radiotherapy treatment planning for the thorax and upper abdomen. Accounting for breathing motion has a…”
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Neighborhood search approaches to beam orientation optimization in intensity modulated radiation therapy treatment planning by Aleman, Dionne M., Kumar, Arvind, Ahuja, Ravindra K., Romeijn, H. Edwin, Dempsey, James F.

“…The intensity modulated radiation therapy (IMRT) treatment planning problem consists of several subproblems which are typically solved sequentially. We seek to…”
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Determination and delineation of nodal target volumes for head-and-neck cancer based on patterns of failure in patients receiving definitive and postoperative IMRT by Chao, K S Clifford, Wippold, Franz J, Ozyigit, Gokhan, Tran, Binh N, Dempsey, James F

“…We present the guidelines for target volume determination and delineation of head-and-neck lymph nodes based on the analysis of the patterns of nodal failure…”
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TG-69: Radiographic film for megavoltage beam dosimetry by Pai, Sujatha, Das, Indra J., Dempsey, James F., Lam, Kwok L., LoSasso, Thomas J., Olch, Arthur J., Palta, Jatinder R., Reinstein, Lawrence E., Ritt, Dan, Wilcox, Ellen E.

“…TG-69 is a task group report of the AAPM on the use of radiographic film for dosimetry. Radiographic films have been used for radiation dosimetry since the…”
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A novel approach to overcome hypoxic tumor resistance: Cu-ATSM-guided intensity-modulated radiation therapy by Chao, K S, Bosch, W R, Mutic, S, Lewis, J S, Dehdashti, F, Mintun, M A, Dempsey, J F, Perez, C A, Purdy, J A, Welch, M J

“…Locoregional tumor control for locally advanced cancers with radiation therapy has been unsatisfactory. This is in part associated with the phenomenon of tumor…”
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An extensive log-file analysis of step-and-shoot intensity modulated radiation therapy segment delivery errors by Stell, Anthony M., Li, Jonathan G., Zeidan, Omar A., Dempsey, James F.

“…We present a study to evaluate the monitor unit (MU), dosimetric, and leaf-motion errors found in the delivery of 91 step-and-shoot IMRT treatment plans…”
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Evaluation of surface and build-up region dose for intensity-modulated radiation therapy in head and neck cancer by Chung, Heeteak, Jin, Hosang, Dempsey, James F., Liu, Chihray, Palta, Jatinder, Suh, Tae-Suk, Kim, Siyong

“…Despite much development, there remains dosimetric uncertainty in the surface and build-up regions in intensity-modulated radiation therapy treatment plans for…”
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A Fourier analysis of the dose grid resolution required for accurate IMRT fluence map optimization by Dempsey, James F., Romeijn, H. Edwin, Li, Jonathan G., Low, Daniel A., Palta, Jatinder R.

“…We present a theoretical and empirical analysis of the errors associated with the spatial discretization of the dose grid employed in optimized intensity…”
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Evaluating Target Cold Spots By the use of Tail EUDs by Bortfeld, Thomas, Ph.D, Craft, David, Ph.D, Dempsey, James F., Ph.D, Halabi, Tarek, Ph.D, Romeijn, H. Edwin, Ph.D

“…Purpose To propose a new measure of target underdose that can be used in the evaluation and optimization of radiotherapy dose distributions. Methods and…”
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Ionization chamber volume averaging effects in dynamic intensity modulated radiation therapy beams by Low, Daniel A., Parikh, Parag, Dempsey, James F., Wahab, Sasha, Huq, Saiful

“…The commercial cylindrical ionization chamber ionization integration accuracy of dynamically moving fields was evaluated. The ionization chambers were exposed…”
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Image-based dose planning of intracavitary brachytherapy: registration of serial-imaging studies using deformable anatomic templates by Christensen, G E, Carlson, B, Chao, K S, Yin, P, Grigsby, P W, Nguyen, K, Dempsey, J F, Lerma, F A, Bae, K T, Vannier, M W, Williamson, J F

“…To demonstrate that high-dimensional voxel-to-voxel transformations, derived from continuum mechanics models of the underlying pelvic tissues, can be used to…”
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Initial evaluation of commercial optical CT-based 3D gel dosimeter by Islam, K. T. S., Dempsey, James F., Ranade, Manisha K., Maryanski, Marek J., Low, Daniel A.

“…We evaluated the OCTOPUS-ONE™ research laser CT scanner developed and manufactured by MGS Research, Inc. (Madison, CT). The scanner is designed for imaging 3D…”
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Characterization of the onboard imaging unit for the first clinical magnetic resonance image guided radiation therapy system by Hu, Yanle, Rankine, Leith, Green, Olga L., Kashani, Rojano, Li, H. Harold, Li, Hua, Nana, Roger, Rodriguez, Vivian, Santanam, Lakshmi, Shvartsman, Shmaryu, Victoria, James, Wooten, H. Omar, Dempsey, James F., Mutic, Sasa

“…Purpose: To characterize the performance of the onboard imaging unit for the first clinical magnetic resonance image guided radiation therapy (MR‐IGRT) system…”
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Dosimetry of therapeutic photon beams using an extended dose range film by Esthappan, Jacqueline, Mutic, Sasa, Harms, William B., Dempsey, James F., Low, Daniel A.

“…For intensity modulated radiation therapy (IMRT) dose distribution verification, multidimensional measurements are required to quantify the steep dose-gradient…”
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A prototype quantitative film scanner for radiochromic film dosimetry by Ranade, Manisha K., Li, Jonathan G., Dubose, Ryan S., Kozelka, Jakub, Simon, William E., Dempsey, James F.

“…We have developed a high resolution, quantitative, two-dimensional optical film scanner for use with a commercial high sensitivity radiochromic film (RCF) for…”
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Verification of step-and-shoot IMRT delivery using a fast video-based electronic portal imaging device by Zeidan, Omar A., Li, Jonathan G., Ranade, Manisha, Stell, Anthony M., Dempsey, James F.

“…We present an investigation into the use of a fast video-based electronic portal-imaging device (EPID) to study intensity modulated radiation therapy (IMRT)…”
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