How Often Should Dosimetry Be Recalculated For Radiation Therapy

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A decision support tool to optimize IMRT QA workflow in a

3Centre for medical radiation physics, University of Wollongong, Wollongong, New South Wales, Australia. 4Uinversity of New South Wales, Sydney, New South Wales, Australia. [email protected] Abstract. Development of a software tool to ease the Intensity Modulated Radiation Therapy

S910 ESTRO 35 2016 EP-1918 Radiotherapy quality assurance in

decided if these should be included in specific cases, perhaps including a flowchart to aid standardisation. Some groups have already reviewed or are in the process of reviewing their reports to ensure inclusion of core information. EP-1921 Novalis certification of stereotactic radiation therapy programs: methodology and current status. J. Robar

Dosimetric evaluation of the Acuros XB algorithm for a 4 MV

for accurate dose calculation used in radiation therapy in phantom experiments, assuming the presence of homogeneous water and heterogeneous media.(3,4) Widely differing densities are evident among the head and neck region (soft tissue, bone, air cavities); moreover, primary tumors often exist next to air in the oral or pharyngeal cavities

Stunning After Tracer Dosimetry

dose from the dosimetry study before therapy, but we discovered that this was not possible in these patients. We have recalculated the slope and correlation coefficient for the plot of percentage uptake from the therapy scan versus per-centage uptake from the dosimetry scan (Fig. 2 (4)). The original 2 2

Grand Valley State University [email protected]

Radiation therapy was first used adjunctively to surgery for breast cancer treatment in 1937 [1]. With the intent of sparing the breast tissue in mind, radium needles were placed into the cavity following surgical tumor removal [1]. Radiation therapy and other treatment modalities for breast cancer have significantly improved in the last

Hybrid plan verification using the 2D-array I'mRT MatriXX

Germany) has been developed for absolute 2D dosimetry and verification of intensity-modulated radiation therapy (IMRT) for perpendicular beam incidence. The aim of this study is to evaluate the applicability of I mRT MatriXX for oblique beam incidence and hybrid plan verification of IMRT with original gantry angles.

Title Hirata, Kimiko; Nakamura, Mitsuhiro; Yoshimura, Michio

The dosimetric differences should not be ignored, particularly with cartilaginous structures in PTV. PACS number: 87.55.-x,, 87.55.kd Key words: Acuros XB algorithm, intensity-modulated radiation therapy, head and neck cancer, low-energy photon beam, heterogeneous media JOURNAL OF APPLIED CLINICAL MEDICAL PHYSICS, VOLUME 16, NUMBER 4, 2015

Evaluation of treatment planning system monitor unit

Intensity modulated radiation therapy (IMRT) has been increasingly used in radiotherapy departments during the last several years. Dosimetric studies have es-tablished intensity-modulated radiotherapy (IMRT) as superior to three-dimensional conformal radiotherapy (3D-CRT) (1-3) in terms of target coverage, conformity, and

Radiation-Absorbed Dose from Tl-Thallous Chloride

adult human subjects (25) and recalculated radiation dose estimates for internal organs using these and other data in the extant literature (18). No attempt was made to investi-gate the small-scale dosimetry considerations described by Rao et al. (23,26); rather, the results are provided as whole-

Comparison of IMRT and VMAT plans with different energy

levels. The most prominent difference was observed in normal tissue doses. OAR doses A comparison of the dosimetric parameters of OARs for each of the plan types is listed in Table 2.

Tumour Shrinkage during Proton-based Chemoradiation for Non

approach. Regrettably, conventional photon radiation therapy for advanced disease is associated with unsatisfactory local control rates (usually 1<50%). Dose escalation to the target volume may improve the likelihood of local control but is limited by the dose to normal tissues, while the lung itself is often the dose-limiting 2organ.


range of dosimetry systems, ranging from radiation detector arrays 13 ,14 15 to linac logfiles.16 17 Background: Volumetric modulated arc therapy (VMAT) is the standard of care for many clinical indications, but should only be considered with proper technical support and quality assurance (QA) in place.


Jul 24, 2019 Radiation Therapy pre-treatment verifications M. Zani, M. Scaringella, C. Talamonti et al.-Synergistic Effect of Atmospheric Pressure Plasma Pre-Treatment on Alkaline Etching of Polyethylene Terephthalate Fabrics and Films E. A. Elabid Amel, Guo Ying, Shi Jianjun et al.-Influence of the surface pre-treatment of aluminum on the processes of

Leading Senior Physician Leksell Gamma Knife Icon Senior

In the past, brain metastases patients were often treated using whole brain radiotherapy (WBRT), delivered using a linac, adds Dr. Stieler. However, in the literature, there is a clear trend away from WBRT and towards SRS, due to the severe toxicities and poor outcomes associated with WBRT, including cognitive function impairment2

Communication of Uncertainties in Radiation Therapy

Radiation Therapy Ben Mijnheer Disclosure The Netherlands Cancer Institute Antoni van Leeuwenhoek Hospital has a research cooperation with Elekta concerning the development of cone-beam CT and EPID dosimetry software Communication of Uncertainties in Radiation Therapy Learning objective: To describe methods

Potential Systematic Uncertainties in IGRT When FBCT

Radiotherapy of pancreatic cancer often applies a large planning margin in order to account for tumor motion and displacement. Applying a large planning margin increases the treatment toxicities of nearby critical organs, primarily the duodenum, small and large bowels, stomach, kidneys, and liver. 2 Introduction

IMRT pre-treatment verification

④The dosimetric precision and accuracy should be rigorously specified at various dose levels. ⑤The dosimeter response should have a sufficiently large dynamic range and be insensitive to photon energy spectrum and dose rate. By nature of IMRT, stray dose becomes important. Stray dose is deposited at low dose rate by photons of deviating energy

QUT Digital Repository: This is

Gel dosimetry has been employed previously for examining radiation treatment for cancer of the head and neck. In the first instance De Deene et al [23] produced a homogenous PVC walled phantom with the wall shape modelled on the neck region of a Rando phantom. The gel used in this case was a PAG. Comparison of gel

Canadian Partnership for Quality Radiotherapy Technical

Radiation Treatment Centres(1) for a programmatic overview of technical quality control, and a description of how the performance objectives and criteria listed in this document should be interpreted. System Description Ionization chambers and electrometers used for reference dosimetry

Real‐time high spatial resolution dose verification in

Small radiation fields introduce some extra dosimetry require-ments compared to larger fields. Namely high spatial resolution of the detector array for use in steep dose gradients as well as small sensitive volume of a single detector, compared to beam size, to avoid volume averaging. The adopted dosimeter system should ide-

Monte Carlo dose verification of prostate patients treated

IMRT techniques often have larger intensity variations which result in complex MLC patterns and present chal-lenges to dose calculations algorithms because of the effects of radiation transmitted through and scattered from the MLC [7]. For such fields, assumptions used in conventional dose calculation algorithms may break

Review Article BrachytherapyforProstateCancer:ASystematicReview

1Radiation Therapy Unit, Second Department of Radiology, University Hospital of Athens ATTIKON , Rimini 1 Haidari, 124 64 Athens, Greece 2Second Department of Radiology, University Hospital of Athens ATTIKON , Rimini 1 Haidari, 124 64 Athens, Greece 36th Oncologic Deparment of IKA, Asopiou 4, Alexandras Avenue, 11474 Athens, Greece

Iran. J. Radiat. Res., 2011; 9(3): 145-150 Evaluation of

Evaluation of treatment planning system monitor unit calculations for three intensity modulated radiotherapy delivery techniques M.N. Anjum1*, W. Parker1, I. Aldahlawi1, R. Ruo1, M. Afzal2 1McGill

Dosimetry Pioneers since 1922 - Indico [Home]

OCTAVIUS® 4D - New features and future outlook RADIATION THERAPY ICTP School of Medical Physics for Radiation Therapy 03.04.2019 PTW Today - A Global Leader in Dosimetry Full range supplier of radiation dosimetry products in family hands for almost a century Industry-leading product portfolio (> 350 products) 328 employees worldwide

RESEARCH Open Access Assessment of I-125 seed implant

needle positions are updated real-time on the treatment planning system and the dosimetry is automatically recalculated. The aim of this investigation was to assess the differences and clinical relevance between the planned dosimetry and the updated real-time implant dosimetry. Methods: A number of 162 patients were included in this dosimetric

The effect of arm position on the dosimetry of thoracic

position.8 Despite that, protocols for Radiation Therapy Oncology Group (RTOG) 0236 and currently enrolling or recently closed RTOG trials (0813 and 0915, respectively) have not specified arm position.5,6,9 AU tends to be used rather than AD for thoracic radiation therapy likely because of 3 concerns. First, that beam attenuation by

Secondary Particle Dose and RBE Measurements Using High

and dosimetry of the beams of these particles through the registration of secondary charged particles with sufficiently high values of linear energy transfer (LET). The studied were realized in a clinical proton beam of the NCC Korea, with primary energy of 72 to 220 MeV (1.1 to 0.4 KeV/ m). The contribution of the secondary

Treatment Planning System Commissioning and QA: Incorporating

Oct 17, 1983 for evaluating quality assurance needs in radiation therapy. Int J Radiat Oncol Biol Phys, 2008; 71(1 Suppl), S170-3. It is difficult for engineers to change

Clinical Implementation and Evaluation of MR-only

the case moves to dosimetry. The structure sets and imag-es are sent to planning (in our case, this is the same plat-form as contouring) and the radiation plan is optimized. Quality assurance Once the images are acquired, the quality assurance sequences are reviewed for geometric accuracy quality control.