A5018149254- Advanced Radiotherapy Techniques
- Radiation Dose and Imaging
- Advanced X-ray and CT Imaging
- Medical Imaging Techniques and Applications
- Advances in Oncology and Radiotherapy
- Head and Neck Cancer Studies
- Breast Implant and Reconstruction
- Breast Cancer Treatment Studies
- Prostate Cancer Diagnosis and Treatment
University of Maryland, Baltimore
2012-2013
University of California, San Francisco
2009-2010
University of California, San Diego
2009-2010
University of California San Diego Medical Center
2010
Purpose: Concurrent irradiation of the prostate and pelvic lymph nodes is technically challenging due to treating one moving target immobile target. The purposes this article are propose a new management strategy compare conventional isocenter shift method previously proposed MLC‐shifting method. Methods: To cope with two volumes (one immobile), authors referred as multiple adaptive plans (MAPs). This involves creation pool for number potential locations. Without requiring any additional...
Purpose: The use of image guided radiation therapy (IGRT) enables compensation for prostate movement by shifting the treatment isocenter to track on a daily basis. Although can alter source skin distances (SSDs) and effective depth target volume, it is commonly assumed that these changes have negligible dosimetric effect, therefore, number monitor units delivered usually not adjusted. However, unknown whether or this assumption valid patient with hip prostheses, which frequently contain high...
Purpose: The calculation methods used to determine tissue-maximum ratio (TMR) from percent depth dose (PDD) were derived by considering differences between TMR and PDD such as the geometry field size. Phantom scatter factors or peak are correct dosimetric variation due size differences. This relation matches well when photon beam is flat. However, validity of this equation for flattening filter-free (FFF) beams has never been evaluated. study aims evaluate FFF beams. Methods: Measured TMR's...
Purpose: Due to the nature of beam fluence flattening‐filter free (FFF) mode from Varian TrueBeam linear accelerator, tissue‐maximum ratio (TMR) conversion formalism percent‐depth dose (PDD) may not be appropriate at large field sizes and depths. The purpose this work was establish an analytical correction which accounts for differences in FFF‐mode profiles that corrects small TMR between calculations measurements. Methods: Two beams (6‐MV 10‐MV) were investigated using accelerator....
Purpose: Traditional SBRT employs approximately 10 static beams with up to 20 Gy per fraction, requiring lengthy treatments which can be difficult for patients tolerate, increasing the risk of movement, and causing discrepancies in reproducibility breathing cycle. Commercial VMAT systems offer shorter treatment times modulated beams; however, modulation is often not necessary or desired small fields. Conformai arc therapy offers efficient beam delivery, but only one aperture shape constant...
Purpose : Quality assurance of Large Field IMRT (LFIMRT) treatments present a unique problem for users portal dosimetry because LFIMRT calculations are not currently supported in the calculation module. However, EPID images delivery can be acquired normal manner used dosimetry. This study reports technique dosimetric analysis using integrated and software. Method Materials plans calculated ECLIPSE treatment planning system from Varian Medical Systems. Treatments delivered Trilogy linear...