ConferenceInternational journal of radiation oncology, biology, physics · November 2021
Purpose/objective(s)Limited published data address modifiable risk factors for significant toxicity complicating moderately hypofractionated schedules of intensity-modulated radiation therapy (IMRT) and proton-beam therapy (PBT) in patients with e ...
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ConferenceMedical Physics · January 1, 2011
Purpose: To introduce and evaluate a new method for automatically extracting respiratory phase information directly from CBCT or tomosynthesis projection data. Methods: In the proposed method, the Black and Anandan dense optical flow is computed in the lon ...
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ConferenceMedical Physics · January 1, 2011
Purpose: To compare two methods for reducing artifacts in cone‐beam CT (CBCT) images caused by the presence of an electromagnetic array used for tracking transponders during radiotherapy. Methods: A pelvis phantom was imaged using a gantry mounted CBCT sys ...
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ConferenceMedical Physics · January 1, 2010
Purpose: One challenge of on‐line image‐guided radiation therapy is requirement of immediate availability of reconstructed 3D or 4D images for evaluation. This study is to develop a highly data‐parallel version and platform of accelerating reconstruction f ...
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ConferenceMedical Physics · January 1, 2009
Any deviation between treated and planned volumes for 3‐D conformal therapy, such as IMRT, may cause an adverse clinical outcome. It is therefore critical to minimize all potential deviations using an on‐board (or real‐time) imaging procedure immediately p ...
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ConferenceMedical Physics · January 1, 2008
Purpose: To investigate a method to convert the pixel values of DTS images to HU values with reference HU values from CT images. Method and Materials: This study included CT and DTS images of two phantoms (Catphan and a chest phantom) and three patients (p ...
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ConferenceMedical Physics · January 1, 2008
Purposes: A research platform was developed for target verification using digital tomosynthesis (DTS). To verify its accuracy, a phantom study was conducted and several clinical cases were investigated. Method and Materials: customer‐developed reconstructi ...
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ConferenceMedical Physics · January 1, 2008
Purpose: We propose a simulation study to examine the feasibility of incorporating dual energy (DE) subtraction with digital tomosynthesis (DTS) to help reduce DTS reconstruction artifacts. Method and Materials: We have previously investigated the incorpor ...
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ConferenceMedical Physics · January 1, 2008
Purpose: To assess the impact of scan angles on the visibility of anatomy in on‐board digital tomosynthesis (DTS) images as a means to optimize this technique. Method and Materials: Head and neck cancer patients undergoing intensity‐modulated radiotherapy ...
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ConferenceMedical Physics · January 1, 2008
Purpose: Amplitude and period of respiratory motion vary among patients. For four‐dimensional digital tomosynthesis (4D‐DTS), the frequency of projection acquisition and the phase window must be optimized based on respiratory motion. The purpose of this st ...
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ConferenceMedical Physics · January 1, 2008
Purpose: Digital Tomosynthesis (DTS) is a quasi‐3D imaging technique which reconstructs images from a limited angle of on‐board projections with significantly lower dose and shorter acquisition time than full cone‐beam CT (CBCT). However, DTS images recons ...
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ConferenceMedical Physics · January 1, 2008
Purpose: Modern IMRT plans have necessitated improved image localization techniques. In the lungs, internal target volumes (ITVs) are often generated from 4DCT images; however, the patient must be properly localized daily for this to work effectively. In t ...
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ConferenceMedical Physics · January 1, 2007
Purpose: To demonstrate clinical feasibility of generating digital tomosynthesis (DTS) in a single breath‐hold (BH) period compared to multiple BH periods for CBCT acquisition and to examine on‐board BH‐DTS as an efficient alternative to BH‐CBCT for target ...
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ConferenceMedical Physics · January 1, 2007
Purpose: Evaluation of the radiation characteristics and performance of the DVS® implantable MOSFET dosimeter for typical and hypo‐fractionated protocols. Method and Materials: The commercially available DVS is calibrated for use in the range of 150–250 cG ...
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ConferenceMedical Physics · January 1, 2007
Purpose: Automatic registration between reference and on‐board digital tomosynthesis (DTS) is a critical step for target localization using DTS. We previously developed an approximate method for automatic registration between reference and on‐board DTS, in ...
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ConferenceMedical Physics · January 1, 2007
Purpose: To develop a workstation for clinical application of digital tomosynthesis (DTS) for real‐time target localization. Specifically, to accelerate the reconstruction both digitally‐reconstructed radiograph (DRR) and DTS using ultra‐fast interpolation ...
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ConferenceMedical Physics · January 1, 2007
Purpose: This clinical study evaluates digital tomosynthesis (DTS) technology for daily imaging guidance for partial breast irradiation (PBI) and compares its positioning accuracy to the 3D CBCT technique. Compared to CBCT, DTS offers lower imaging dose an ...
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ConferenceMedical Physics · January 1, 2006
Purpose: This project presents an analysis of the point spread function (PSF) of isocentric digital tomosynthesis (DTS). DTS is a limited angle 3‐ dimensional reconstruction from cone beam projections, with high resolution for excellent imaging of both bon ...
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ConferenceMedical Physics · January 1, 2006
Purpose: To study the impact of projection numbers on the quality of tomosynthesis images using megavoltage beams. Method and Materials: It has been shown that isocentric kilovoltage tomosynthesis images can be generated with no more than 50 degree scan an ...
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ConferenceMedical Physics · January 1, 2006
Purpose: Digital tomosynthesis (DTS) is a fast, low‐dose method for reconstructing 3‐D slices from 2‐D cone‐beam x‐ray projection data acquired with limited source angulation (e.g., 40°). We previously developed a method for reconstructing reference DTS (R ...
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ConferenceMedical Physics · January 1, 2006
Purpose: Digital tomosynthesis (DTS) is a method for reconstructing 3D images from cone‐beam projection data acquired with limited angulation (e.g., 40°) of an x‐ray source, and is much faster and lower dose than full cone‐beam CT (CBCT). We previously dev ...
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ConferenceMedical Physics · January 1, 2006
Daily target localization is a critical step to secure accurate delivery for 3‐D conformal radiation therapy and intensity‐modulated radiation therapy. One emerging technology using in‐room kilovoltage (kV) imaging has shown to be very promising for target ...
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ConferenceMedical Physics · January 1, 2006
Purpose: To develop a method to reconstruct CBCT data based on projection data acquired at a specific respiration phase. Methods and Materials: The original projection data were acquired using an on‐board imager (OBI) (Varian Medical Systems) over scanning ...
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ConferenceMedical Physics · January 1, 2005
Purpose: This study introduces a new radiation therapy target localization technique using online digital tomosynthesis (DTS), a method for reconstructing 3‐D slices from 2‐D projection data acquired with limited source motion. By separating the visualizat ...
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