Zobrazeno 1 - 10
of 149
pro vyhledávání: '"W Ansbacher"'
Autor:
Daniel Shedlock, W. Ansbacher, Clayton Lindsay, M. Newson, Lei Xing, Adam Wang, Magdalena Bazalova-Carter, Meng Wu, Rebecca Fahrig, Josh Star-Lack
Publikováno v:
Med Phys
Purpose Combined kV-MV cone-beam tomography (CBCT) imaging has been proposed for two potentially important image-guided radiotherapy applications: (a) scan time reduction (STR) and (b) metal artifact reduction (MAR). However, the feasibility of these
Publikováno v:
Journal of Applied Clinical Medical Physics
EPID images acquired in cine mode during arc therapy have inaccurate gantry angles recorded in their image headers. In this work, methods were developed to assess the accuracy of the gantry potentiometer for linear accelerators. As well, assessments
Autor:
Wayne Beckham, Alan Nichol, Sergei Zavgorodni, Maria T. Vlachaki, Pauline T. Truong, B. Bendorffe, Valerie Panet-Raymond, W Ansbacher
Publikováno v:
Journal of Applied Clinical Medical Physics
Scopus-Elsevier
Scopus-Elsevier
The purpose of this study was to compare dosimetric and radiobiological parameters of treatment plans using coplanar and noncoplanar beam arrangements in patients with fronto‐temporal high‐grade glioma (HGG) generated for intensity‐modulated ra
Publikováno v:
Journal of Applied Clinical Medical Physics
The purpose of this study is to simulate random and systematic RapidArc delivery errors for external beam prostate radiotherapy plans in order to determine the dose sensitivity for each error type. Ten prostate plans were created with a single 360°
Publikováno v:
Medical Physics. 38:2208-2221
Purpose: The dosimetric accuracy of the recently released Acuros XB advanced dose calculation algorithm (Varian Medical Systems, Palo Alto, CA) is investigated for single radiation fields incident on homogeneous and heterogeneous geometries, and a co
Publikováno v:
Radiotherapy and Oncology. 97:554-560
Background and purpose Multi-leaf collimator (MLC) positional errors occur during intensity modulated radiation therapy (IMRT) and volumetric modulated arc therapy (VMAT) deliveries. The impact of such errors has been evaluated for IMRT but not VMAT.
Publikováno v:
Journal of Applied Clinical Medical Physics
The purpose of this study is to examine plan quality, treatment planning time, estimated treatment delivery time and other dose metrics for 5 and 9 field sliding window IMRT (IMRT5 and IMRT9), single and dual arc Rapid Arc (RA1 and RA2) and Tomothera
Publikováno v:
Physics in Medicine and Biology. 53:7167-7185
RapidArc, recently released by Varian Medical Systems, is a novel extension of IMRT in which an optimized 3D dose distribution may be delivered in a single gantry rotation of 360 degrees or less. The purpose of this study was to investigate the accur
Autor:
W. Ansbacher
Publikováno v:
Medical Physics. 33:3369-3382
A new method for rapid evaluation of intensity modulated radiation therapy (IMRT) plans has been developed, using portal images for reconstruction of the dose delivered to a virtual three-dimensional (3D) phantom. This technique can replace an array
Autor:
Josh Star-Lack, Adam Wang, Magdalena Bazalova-Carter, M. Newson, Meng Wu, W. Ansbacher, Lei Xing, Rebecca Fahrig
Publikováno v:
Medical Physics. 43:3340-3341
Purpose: To investigate whether a high detection quantum efficiency (DQE) MV detector makes combined kV/MV CBCT clinically practical. Methods: Combined kV/MV CBCT was studied for scan time reduction (STR) and metal artifact reduction (MAR). 6MV CBCT