Comparison of treatment planning approaches for spatially fractionated irradiation of deep tumors.

CONCLUSION: Our results present, for the first time, preliminary evidence comparing IMRT-GRID approaches which result in high-dose "islands" within a target, mimicking what is achieved with a conventional GRID block but without high-dose "tail" regions outside of the target. These approaches differ modestly in their ability to achieve high peak-to-edge ratios and also differ in delivery times. PMID: 31112629 [PubMed - as supplied by publisher]
Source: Journal of Applied Clinical Medical Physics - Category: Physics Authors: Tags: J Appl Clin Med Phys Source Type: research

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Conclusion: The results proved that the methodology of the IMRT/VMAT dosimetric end-to-end audit was feasible for its intended purpose, i.e., the phantom design and materials were suitable; the phantom was easy to use and it was robust enough for shipment. Most importantly the audit methodology was capable of identifying suboptimal IMRT/VMAT delivery. PMID: 31423867 [PubMed - as supplied by publisher]
Source: Acta Oncologica - Category: Cancer & Oncology Authors: Tags: Acta Oncol Source Type: research
Proton therapy has an important role in the management of head and neck cancer, where the dosimetric characteristics of proton particles are advantageous for treating tumors in complex anatomic areas. In addition to highly targeted dose depositions owing to the Bragg peak and superior lateral dose distribution of proton therapy, the introduction of spot-scanning techniques that allow intensity-modulated proton therapy (IMPT) further improve dose distributions and normal-tissue sparing relative to intensity-modulated (photon) radiation therapy (IMRT), a finding that has been validated in case-matched analyses showing lower ...
Source: Radiotherapy and Oncology - Category: Radiology Authors: Tags: Original Article Source Type: research
Conclusion: VMAT combined with IC/IS BT can result in satisfactory curative outcomes and low incidences of late radiation enterocolitis and cystitis in CC treatment.
Source: Frontiers in Oncology - Category: Cancer & Oncology Source Type: research
Conditions:   Esophagus Cancer;   Esophageal Cancer;   Cancer of the Esophagus Interventions:   Radiation: Intensity Modulated Radiation Therapy;   Drug: FOLFOX regimen;   Other: MD Anderson Symptom Inventory (MDASI)-Plus module;   Other: EuroQol (EQ-5D);   Other: SF-12;   Other: MOS Social Support Measure;   Other: CES-D;   Procedure: Blood for ctDNA;   Procedure:  Urine for ctDNA;   Procedure: Blood for SCCA Sponsor: &n...
Source: ClinicalTrials.gov - Category: Research Source Type: clinical trials
Abstract Transmission detectors meant to measure every beam delivered on a linear accelerator are now becoming available for monitoring the quality of the dose distribution delivered to the patient daily. The purpose of this work is to present results from a systematic evaluation of the error detection capabilities of one such detector, the Delta4 Discover. Existing patient treatment plans were modified through in-house-developed software to mimic various delivery errors that have been observed in the past. Errors included shifts in multileaf collimator leaf positions, changing the beam energy from what was planne...
Source: Journal of Applied Clinical Medical Physics - Category: Physics Authors: Tags: J Appl Clin Med Phys Source Type: research
Publication date: Available online 2 August 2019Source: Practical Radiation OncologyAuthor(s): Robert T. Dess, Yilun Sun, Daniel G. Muenz, Peter A. Paximadis, Michael M. Dominello, Inga S. Grills, Larry L. Kestin, Benjamin Movsas, Kathryn J. Masi, Martha M. Matuszak, Jeffrey D. Radawski, Jean M. Moran, Lori J. Pierce, James A. Hayman, Matthew J. Schipper, Shruti Jolly, Michigan Radiation Oncology Quality ConsortiumAbstractPurposeThe heart has been identified as a potential significant organ at risk in patients with locally-advanced non-small cell lung cancer (NSCLC) treated with radiation. Practice patterns and radiation d...
Source: Practical Radiation Oncology - Category: Cancer & Oncology Source Type: research
Abstract Randomized trials demonstrated similar overall survival between mastectomy and breast-conservative surgery followed by adjuvant radiation therapy. Breast-conservative surgery, with adjuvant radiation therapy, with or without neoadjuvant systemic therapy has become the standard of care for women with early or locally advanced breast cancer. Nevertheless, certain cardiac, lung or cutaneous toxicities may alter the long-term body image and the quality of life of a limited number of patients who consider having had "overtreatment" or treatment outside the best knowledge of science. In case of low-ri...
Source: Cancer Radiotherapie - Category: Cancer & Oncology Authors: Tags: Cancer Radiother Source Type: research
CONCLUSION: With minimal planner interventions, advanced treatment planning tools are clinically useful, producing a plan quality similarly to or better than manual plans, improving plan consistency. For difficult cases such as HN cancer, advanced planning tools can further reduce radiation doses to numerous OARs while delivering adequate dose to the tumor targets. PMID: 31364798 [PubMed - as supplied by publisher]
Source: Journal of Applied Clinical Medical Physics - Category: Physics Authors: Tags: J Appl Clin Med Phys Source Type: research
AbstractWe evaluated an anthropomorphic head and neck phantom with tissue heterogeneity, produced using a personal 3D printer, with quality assurance (QA), specific to patients undergoing intensity-modulated radiation therapy (IMRT). Using semi-automatic segmentation, 3D models of bone, soft tissue, and an air-filled cavity were created based on computed tomography (CT) images from patients with head and neck cancer treated with IMRT. For the 3D printer settings, polylactide was used for soft tissue with 100% infill. Bone was reproduced by pouring plaster into the cavity created by the 3D printer. The average CT values for...
Source: Radiological Physics and Technology - Category: Physics Source Type: research
trois centres français Abstract Intensity-modulated radiation therapy (IMRT) is presently the recommended technique for the treatment of locally advanced head and neck carcinomas. Proton therapy would allow to reduce the volume of irradiated normal tissue and, thus, to decrease the risk of late dysphagia, xerostomia, dysgeusia and hypothyroidism. An exhaustive research was performed with the search engine PubMed by focusing on the papers about the physical difficulties that slow down use of proton therapy for head and neck carcinomas. Range uncertainties in proton therapy (±3 %) paradoxically li...
Source: Cancer Radiotherapie - Category: Cancer & Oncology Authors: Tags: Cancer Radiother Source Type: research
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