Search results for "Intensity-modulated radiation therapy"

showing 3 items of 3 documents

Determination of boundaries between ranges of high and low gradient of beam profile

2016

Abstract Aim This work addresses the problem of treatment planning system commissioning by introducing a new method of determination of boundaries between high and low gradient in beam profile. Background The commissioning of a treatment planning system is a very important task in the radiation therapy. One of the main goals of this task is to compare two field profiles: measured and calculated. Applying points of 80% and 120% of nominal field size can lead to the incorrect determination of boundaries, especially for small field sizes. Materials and methods The method that is based on the beam profile gradient allows for proper assignment of boundaries between high and low gradient regions …

EngineeringMathematical optimizationField (physics)business.industrydose gradientWork (physics)Extremely HelpfulIntensity-modulated radiation therapy030218 nuclear medicine & medical imagingComputational physics03 medical and health sciences0302 clinical medicineTPS commissioningOncology030220 oncology & carcinogenesisField sizebeam profileRadiology Nuclear Medicine and imagingPoint (geometry)Low gradientOriginal Research ArticlebusinessBeam (structure)
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Intensity modulated radiation therapy with simultaneous integrated boost in early breast cancer irradiation. Report of feasibility and preliminary to…

2015

To investigate the feasibility and tolerance in the use of adjuvant intensity modulated radiation therapy (IMRT) and simultaneous integrated boost in patients with a diagnosis of breast cancer after breast-conserving surgery.Between September 2011 to February 2013, 112 women with a diagnosis of early breast cancer (T1-2, N0-1, M0) were treated with IMRT and simultaneous integrated boost after breast-conserving surgery in our institution. A dose of 50Gy in 25 fractions was prescribed to the whole breast and an additional dose of radiation was prescribed on the tumour bed. A dose prescription of 60Gy in 25 fractions to the tumour bed was used in patients with negative margins after surgery, w…

Oncologymedicine.medical_treatmentSegmentalMastectomy SegmentalSeverity of Illness IndexBreast cancerNuclear Medicine and ImagingDuctalIntensity-Modulated80 and overBreastMastectomyAdjuvantEarly breast cancerAged 80 and overCarcinoma Ductal BreastSIBRadiotherapy DosageMiddle AgedOncologyBreast cancer; IMRT; SIB; Toxicity; Adult; Aged; Aged 80 and over; Breast Neoplasms; Carcinoma Ductal Breast; Carcinoma Lobular; Esthetics; Feasibility Studies; Female; Follow-Up Studies; Humans; Mastectomy Segmental; Middle Aged; Radiodermatitis; Radiotherapy Dosage; Radiotherapy Adjuvant; Severity of Illness Index; Radiotherapy Intensity-Modulated; Oncology; Radiology Nuclear Medicine and ImagingToxicityFemaleRadiologyRadiodermatitisRadiologyAdjuvantSimultaneous integrated boostAdultmedicine.medical_specialtyEstheticsBreast NeoplasmsLobularBreast cancerInternal medicineSeverity of illnessmedicineHumansRadiology Nuclear Medicine and imagingIMRTAgedToxicityRadiotherapybusiness.industryCarcinomaIntensity-modulated radiation therapymedicine.diseaseAcute toxicityBreast cancer; IMRT; SIB; Toxicity; Oncology; Radiology Nuclear Medicine and ImagingCarcinoma LobularFeasibility StudiesRadiotherapy AdjuvantRadiotherapy Intensity-ModulatedbusinessFollow-Up Studies
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SU-E-T-343: Valencia Applicator Commissioning Using a Micro-Chamber Array

2014

Purpose: In the commissioning and QA of surface isotope-based applicators, source-indexer distance (SID) has a great influence in the flatness, symmetry and output. To these purposes, methods described in the literature are the use of a special insert at the entrance of dwell chamber or radiochromic films. Here we present the experience with a micro-chamber array to perform the commissioning and QA of Valencia applicators. Methods: Valencia applicators have been used, the classic and the new extra-shielded version. A micro-chamber array has been employed, 1000 SRS (PTW), with 977 liquid filled, 2.3×2.3×0.5 mm3 sized ion chambers covering 11×11 cm2, which spacing is 2.5 mm in the central 5.5…

PhysicsTime delay and integrationbiologybusiness.industryFlatness (systems theory)General MedicineIntensity-modulated radiation therapybiology.organism_classificationOpticsIonization chamberStandard protocolPatient dosebusinessNuclear medicineValenciaMedical Physics
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