Search Results - "Willborn, K"

Erratum: “Performance Parameters of a Liquid Filled Ionization Chamber Array” [Med. Phys. 40, 082106 (2013)] by Poppe, B., Stelljes, T. S., Looe, H. K., Harder, D., Willborn, K.

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Performance parameters of a liquid filled ionization chamber array by Poppe, B., Stelljes, T. S., Looe, H. K., Chofor, N., Harder, D., Willborn, K.

“…Purpose: In this work, the properties of the two-dimensional liquid filled ionization chamber array Octavius 1000SRS (PTW-Freiburg, Germany) for use in…”
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DAVID--a translucent multi-wire transmission ionization chamber for in vivo verification of IMRT and conformal irradiation techniques by Poppe, B, Thieke, C, Beyer, D, Kollhoff, R, Djouguela, A, Rühmann, A, Willborn, K C, Harder, D

“…Permanent in vivo verification of IMRT photon beam profiles by a radiation detector with spatial resolution, positioned on the radiation entrance side of the…”
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3056 Influence of maintenance therapy on incidence of 2nd line therapy and OS in NSCLC IV by Lüers, A, Neemann, N, Prenzel, R, Scriba, D, Hoheisel, M, Wedeken, K, Willborn, K, Griesinger, F

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3119 P53 disruptive mutation is a negative predictive factor in EGFR M+ NSCLC treated with TKI by Lüers, A, Neemann, N, Prenzel, R, Scriba, D, Willborn, K, Stropiep, U, Falk, M, Hallas, C, Tiemann, M, Griesinger, F

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SU‐E‐T‐62: Dosimetric Properties of the Octavius 1000SRS Liquid Filled Ionization Chamber Array by Stelljes, TS, Poppe, B, Looe, HK, Harder, D, Willborn, K

“…Purpose: The two‐dimensional liquid filled ionization chamber array Octavius 1000SRS (PTW‐Freiburg, Germany), being the conceptual successor of the LA48 linear…”
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SU‐E‐T‐60: Evaluation of a Two‐Dimensional Ionization Chamber Array for Proton Beam Dosimetry by Stelljes, TS, van Goethem, M, Brandenburg, S, Willborn, K, Poppe, B

“…Purpose: The application of the two‐dimensional ionization chamber array Octavius 729xdr (PTW‐Freiburg, Germany) in proton beam dosimetry, consisting of 729…”
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SU‐E‐T‐332: Verification of Prostate VMAT Treatment Plans Using the Octavius 4D System by Stelljes, TS, Looe, HK, Willborn, K, Poppe, B

“…Purpose: The introduction of rotational therapy1 has made a refinement of commonly used plan verification processes necessary. In this work the applicability…”
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SU‐E‐T‐343: Monte Carlo Study on a Novel Direction‐Selective Flattening Filter System by Chofor, N, Harder, D, Willborn, K, Poppe, B

“…Purpose: Monte Carlo evaluation of a newly‐designed narrow steel cone flattening filter, which functions via the direction‐selective attenuation of the photons…”
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Enhanced accuracy of the permanent surveillance of IMRT deliveries by iterative deconvolution of DAVID chamber signal profiles by Looe, H K, Harder, D, Rühmann, A, Willborn, K C, Poppe, B

“…In vivo dosimetry systems, capable of permanently monitoring IMRT treatment deliveries throughout all fractions, are increasingly used in clinical practice…”
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1125 poster A NOVEL DIRECTION-SELECTIVE FLATTENING FILTER FOR CLINICAL PHOTON BEAMS – MONTE CARLO EVALUATION OF A NEW CONCEPT by Chofor, N, Harder, D, Willborn, K, Poppe, B

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SU‐E‐T‐65: On the Dose Response Function and the Energy Dependence of a Novel Synthetic Single Crystal Diamond Detector by Looe, HK, Chofor, N, Harmeyer, A, Poppinga, D, Schoenfeld, A, Grabowski, D, Willborn, K, Harder, D, Poppe, B

“…Purpose: To characterize the dose response function K(x) and to analyze the dependence on changing photon spectra of a novel synthetic single crystal diamond…”
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SU‐E‐T‐439: Implementation of an Iterative Deconvolution Method in a Daily In‐Vivo Verification Procedure with the DAVID System by Poppe, B, Looe, H, Luellau, T, Willborn, K, Harder, D

“…Purpose: The DAVID system (PTW‐Freiburg, Germany) is a multiwire ionization chamber placed in the accessory holder, capable of continuously monitoring…”
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SU‐E‐T‐131: Iterative Deconvolution of Dose Profile Measurements with Ionization Chambers Based on Lorentz‐Type Lateral Response Functions of the Detectors by Poppe, B, Stelljes, T, Foschepoth, S, Looe, H, Willborn, K, Harder, D

“…Purpose: In this work it is shown that the volume effect of ionization chamber can be corrected by the application of a van‐Cittert iterative deconvolution…”
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SU‐E‐T‐139: Note on the Underestimation of the Dosimetrical Significance of Detected IMRT Verification Deviations Using the Gamma‐Index Method and a Global Acceptance Criterion Based on the Number of Passing Points by Poppe, B, Looe, H, Luellau, T, Willborn, K, Allgaier, B, Harder, D

“…Purpose: Possible underestimations of the dosimetrical impact of Gamma‐Index detected dose deviations due to the choice of the maximum dose in the analysis…”
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SU‐GG‐T‐182: Two Years of Clinical Experience with DAVID ‐ A Translucent Multi‐Wire Detector for On‐Line Verification of Patient Treatments by Poppe, B, Looe, H, Harder, D, Upphoff, Y, Ruehmann, A, Willborn, K

“…Purpose: The DAVID system is used as an independent monitor system positioned between MLC and patient to assure the correct application of IMRT deliveries. In…”
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SU‐GG‐T‐183: Enhanced Accuracy of IMRT Photon Fluence Profile Surveillance: Iterative Resolution Correction of the DAVID Chamber by Looe, HK, Harder, D, Ruehmann, A, Willborn, K, Poppe, B

“…Purpose: The DAVID system (PTW‐Freiburg, Germany) is a multiwire ionization chamber placed in the accessory holder, capable of continuously monitoring…”
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SU‐FF‐T‐252: Clinical Application of the DAVID System and 2D‐ARRAY for Quality Assurance in IMRT Treatments by Poppe, B, Looe, H, Ruehmann, A, Harder, D, Willborn, K

“…Purpose: A complete IMRT QA program based on a combination of the 2D‐ARRAY and the DAVID system (both PTW‐Freiburg, Germany) is implemented in our clinic to…”
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SU‐FF‐T‐231: Adaptive Warning and Alarm Levels for Error Detection with the DAVID System by Poppe, B, Looe, H, Ruehmann, A, Willborn, K, Harder, D

“…Purpose: A method to determine adaptive warning and alarm levels is developed in order to enhance the error detection capability of the DAVID system. Method…”
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SU‐FF‐T‐191: Considerations of Reference Level Definition for IMRT Plan Verification and Application of a Three Dimensional Gamma‐Index Analysis by Poppe, B, Ruehmann, A, Allgaier, B, Willborn, K, Harder, D

“…Purpose: A 3D Gamma Index analysis and different local reference levels for the dose axis are evaluated. Method and Materials: The Gamma‐Index method is…”
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