Validation of the preconfigured Varian Ethos Acuros XB Beam Model for treatment planning dose calculations: A dosimetric study.

abstract：:The objectives of this project are to quantify the dose reduction effect provided by a lead shield for patients with cardiac implantable electronic devices (CIED) during a clinically realistic radiation treatment on phantom and to provide a simple model of dose estimation to predict dose received by CIED in a wide ran...

journal_title：Journal of applied clinical medical physics

authors： Bourgouin A,Varfalvy N,Archambault L

更新日期：2015-11-08 00:00:00

abstract：:This study utilizes process control techniques to identify action limits for TomoTherapy couch positioning quality assurance tests. A test was introduced to monitor accuracy of the applied couch offset detection in the TomoTherapy Hi-Art treatment system using the TQA "Step-Wedge Helical" module and MVCT detector. Ind...

journal_title：Journal of applied clinical medical physics

authors： Binny D,Lancaster CM,Trapp JV,Crowe SB

更新日期：2017-09-01 00:00:00

abstract：PURPOSE:To provide insight into the types of questions asked to medical physicists by patients during one-on-one physicist-patient consults at one institution. MATERIALS AND METHODS:Medical physicists trained in patient communication techniques met with patients to provide an overview of the treatment planning and del...

journal_title：Journal of applied clinical medical physics

authors： Atwood TF,Brown DW,Juang T,Moore KL,McConnell KA,Steers JM,Murphy JD,Mundt AJ,Pawlicki T

更新日期：2020-08-01 00:00:00

abstract：:The purpose of the present study was to compare the impact of pulmonary function, body habitus, and stereotactic body radiation therapy (SBRT) immobilization on setup and reproducibility for upper lung tumor. From 2008 through 2011, our institution's prospective SBRT database was searched for patients with upper lung ...

journal_title：Journal of applied clinical medical physics

authors： Sio TT,Jensen AR,Miller RC,Fong de los Santos LE,Hallemeier CL,Foster NR,Park SS,Bauer HJ,Chang K,Garces YI,Olivier KR

更新日期：2014-09-08 00:00:00

abstract：:We investigate the role of adaptive radiation therapy in pediatric patients with diffuse pontine glioma and the impact of steroid-related weight gain on treatment parameters utilizing cone-beam CT. Fifteen patients with diffuse pontine glioma were treated with three-dimensional conformal radiation therapy and enrolled...

journal_title：Journal of applied clinical medical physics

authors： Beltran C,Sharma S,Merchant TE

更新日期：2011-01-30 00:00:00

abstract：:A patient with a cardiac ventricular assist device (VAD) with computer-controlled driver presented to our department for radiation therapy. The treatment plan was 4500 cGy to the rectum over 25 fractions with 15MV photon beams. All beams avoided the pump and leads. The response to electromagnetic interference (EMI) wa...

journal_title：Journal of applied clinical medical physics

authors： Lasher DE,Wojcicka JB,Malcom R,Shears LL

更新日期：2008-10-29 00:00:00

abstract：:Highly attenuating radiation treatment couches are no longer useful in the present era of radiotherapy utilizing IMRT and IGRT. Carbon fibers couch tops with its high tensile strength and low density present a useful alternative. The objective of the current study was to quantify the attenuation of megavoltage photons...

journal_title：Journal of applied clinical medical physics

authors： Njeh CF,Raines TW,Saunders MW

更新日期：2009-06-02 00:00:00

abstract：PURPOSE:Adaptive radiotherapy (ART) has potential to reduce toxicity and facilitate safe dose escalation. Dose calculations with the planning CT deformed to cone beam CT (CBCT) have shown promise for estimating the "dose of the day". The purpose of this study is to investigate the "dose of the day" calculation accuracy...

journal_title：Journal of applied clinical medical physics

authors： Yuan Z,Rong Y,Benedict SH,Daly ME,Qiu J,Yamamoto T

更新日期：2020-01-01 00:00:00

abstract：:Flattening filter-free (FFF) beams are becoming the preferred beam type for stereotactic radiosurgery (SRS) and stereotactic ablative radiation therapy (SABR), as they enable an increase in dose rate and a decrease in treatment time. This work assesses the effects of the flattening filter on small field output factors...

journal_title：Journal of applied clinical medical physics

authors： Tyler MK,Liu PZ,Lee C,McKenzie DR,Suchowerska N

更新日期：2016-05-08 00:00:00

abstract：:The purpose of this study is to find the uncertainties in the reconstruction of MR compatible ring-tandem intracavitary applicators of high-dose rate image-based brachytherapy treatment planning using rigid registration of 3D MR and CT image fusion. Tandem and ring reconstruction in MR image based brachytherapy planni...

journal_title：Journal of applied clinical medical physics

authors： Oinam AS,Tomar P,Patel FD,Singh L,Rai B,Bahl A

更新日期：2014-03-06 00:00:00

abstract：:The QFix EncompassTM stereotactic radiosurgery (SRS) immobilization system consists of a thermoplastic mask that attaches to the couch insert to immobilize patients treated with intracranial SRS. This study evaluates the dosimetric impact and verifies a vendor provided treatment planning system (TPS) model in the Ecli...

journal_title：Journal of applied clinical medical physics

authors： Snyder KC,Xhaferllari I,Huang Y,Siddiqui MS,Chetty IJ,Wen N

更新日期：2018-07-01 00:00:00

abstract：:The goal of the present study was to develop a new dose-volume histogram (DVH)- based homogeneity index for effectively evaluating the dose homogeneity of intensity-modulated radiotherapy plans. The new index, called the sigma-index ("S-index") is defined as the standard deviation of the normalized differential DVH cu...

journal_title：Journal of applied clinical medical physics

authors： Yoon M,Park SY,Shin D,Lee SB,Pyo HR,Kim DY,Cho KH

更新日期：2007-03-20 00:00:00

abstract：:The purpose of this study was to determine the reproducibility of patient-specific, intensity-modulated radiation therapy (IMRT) quality assurance (QA) results in a clinical setting. Six clinical patient plans were delivered to a variety of devices and analyses, including 1) radiographic film; 2) ion chamber; 3) 2D di...

journal_title：Journal of applied clinical medical physics

authors： McKenzie EM,Balter PA,Stingo FC,Jones J,Followill DS,Kry SF

更新日期：2014-05-08 00:00:00

abstract：:Studies have shown that source dwells within Varian's HDR CT/MR compatible ring applicators can deviate from intended positions by several millimeters. Quantifying this offset is an important part of commissioning. The aims of this study were to: 1) determine the reproducibility of the offset, 2) study the interobserv...

journal_title：Journal of applied clinical medical physics

authors： McMahon R,Zhuang T,Steffey BA,Song H,Craciunescu OI

更新日期：2011-11-15 00:00:00

abstract：:The aim of this study is to compare the dosimetric characteristics of robotic and conventional linac-based SBRT techniques for lung cancer, and to provide planning guidance for each modality. Eight patients who received linac-based SBRT were retrospectively included in this study. A dose of 60 Gy given in three fracti...

journal_title：Journal of applied clinical medical physics

authors： Ding C,Chang CH,Haslam J,Timmerman R,Solberg T

更新日期：2010-06-29 00:00:00

abstract：:This work compares two accelerated partial breast irradiation modalities, MammoSite brachytherapy and three dimensional conformal radiotherapy (3D-CRT), to a new method, SAVI brachytherapy, following NSABP B-39 guidelines. A total of 21 patients treated at UC San Diego with the SAVI device were evaluated in this compa...

journal_title：Journal of applied clinical medical physics

authors： Scanderbeg D,Yashar C,White G,Rice R,Pawlicki T

更新日期：2009-12-03 00:00:00

abstract：PURPOSE/OBJECTIVES:To present our linac-based SRS procedural technique for medically and/or surgically refractory trigeminal neuralgia (TN) treatment and simultaneously report our clinical outcomes. MATERIALS AND METHODS:Twenty-seven refractory TN patients who were treated with a single fraction of 80 Gy to TN. Treatm...

journal_title：Journal of applied clinical medical physics

authors： Pokhrel D,Sood S,McClinton C,Saleh H,Badkul R,Jiang H,Stepp T,Camarata P,Wang F

更新日期：2017-03-01 00:00:00

abstract：:We investigate the sensitivity of IMRT commissioning using the TG-119 C-shape phantom and credentialing with the IROC head and neck phantom to treatment planning system commissioning errors. We introduced errors into the various aspects of the commissioning process for a 6X photon energy modeled using the analytical a...

journal_title：Journal of applied clinical medical physics

authors： McVicker D,Yin FF,Adamson JD

更新日期：2016-01-08 00:00:00

abstract：:This study aimed to verify the accuracy of half-value layer (HVL) measured using the new copper pipe method with the CT ionization chamber while the X-ray tube is rotating and to compare it with the conventional nonrotating method and Monte Carlo simulation method based on the actual measurement and geometry of the ne...

journal_title：Journal of applied clinical medical physics

authors： Okubo R,Matsubara K,Chusin T,Hibino T,Ito Y

更新日期：2019-12-01 00:00:00

abstract：:The purpose of this study was to quantify the intrafraction motion of pediatric patients with brain tumors during radiation therapy and investigate any correlation between motion, use of general anesthesia, and daily treatment duration. 100 pediatric patients with a mean age of 8.5 years (range: 1.0 to 17.8) were incl...

journal_title：Journal of applied clinical medical physics

authors： Beltran C,Merchant TE

更新日期：2011-11-15 00:00:00

abstract：PURPOSE:The aim of this study was to develop and assess the performance of supervised machine learning technique to classify magnetic resonance imaging (MRI) voxels as cancerous or noncancerous using noncontrast multiparametric MRI (mp-MRI), comprised of T2-weighted imaging (T2WI), diffusion-weighted imaging (DWI), and...

journal_title：Journal of applied clinical medical physics

authors： Gholizadeh N,Simpson J,Ramadan S,Denham J,Lau P,Siddique S,Dowling J,Welsh J,Chalup S,Greer PB

更新日期：2020-10-01 00:00:00

abstract：INTRODUCTION:Designing a radiation plan that optimally delivers both target coverage and normal tissue sparing is challenging. There are limited tools to determine what is dosimetrically achievable and frequently the experience of the planner/physician is relied upon to make these determinations. PlanIQ software provid...

journal_title：Journal of applied clinical medical physics

authors： Fried DV,Chera BS,Das SK

更新日期：2017-09-01 00:00:00

abstract：:The monochromatic images acquired by Gemstone spectral imaging (GSI) mode on the GE CT750 HD theoretically determines the computed tomography (CT) number more accurately than that of conventional scanner. Using the former, the CT number is calculated from (synthesized) monoenergetic X-ray data. We reasoned that the mo...

journal_title：Journal of applied clinical medical physics

authors： Yagi M,Ueguchi T,Koizumi M,Ogata T,Yamada S,Takahashi Y,Sumida I,Akino Y,Konishi K,Isohashi F,Tomiyama N,Yoshioka Y,Ogawa K

更新日期：2013-09-06 00:00:00

abstract：:We have developed a method to improve the setup accuracy of a Varian Clinac 6/100 couch for delivering conformal arc therapy using a tertiary micro multileaf collimator (MLC) system. Several immobilization devices have been developed to improve the mechanical stability and isocenter alignment of the couch: turn-knob h...

journal_title：Journal of applied clinical medical physics

authors： Li K,Yu CX,Ma L

更新日期：2004-07-01 00:00:00

abstract：:The purpose of this study was to develop and evaluate filmless quality assurance (QA) tools for helical tomotherapy by using the signals from the on-board megavoltage computed tomography (MVCT) detector and applying a dedicated step-wedge phantom. The step-wedge phantom is a 15 cm long step-like aluminum block positio...

journal_title：Journal of applied clinical medical physics

authors： Althof V,van Haaren P,Westendorp R,Nuver T,Kramer D,Ikink M,Bel A,Minken A

更新日期：2012-01-05 00:00:00

abstract：:Intra-fraction organ motion during the dynamic delivery of IMRT treatment of lung tumors may cause unexpected hot/cold spots even within the target volume, due to the interplay effect between tumor motion and multi-leaf collimator (MLC) leaf motion. In the past, this has been investigated through theoretical analysis,...

journal_title：Journal of applied clinical medical physics

authors： Berbeco RI,Pope CJ,Jiang SB

更新日期：2006-11-28 00:00:00

abstract：:Longitudinal partial volume effects (z-axial PVE), which occur when an object partly occupies a slice, degrade image resolution and contrast in computed tomography (CT). Z-axial PVE is unavoidable for subslice objects and reduces their contrast according to their fraction contained within the slice. This effect can be...

journal_title：Journal of applied clinical medical physics

authors： Monnin P,Sfameni N,Gianoli A,Ding S

更新日期：2017-01-01 00:00:00

abstract：:IMRT QA requires, among other tests, a time-consuming process of measuring the absorbed dose, at least to a point, in a high-dose, low-dose-gradient region. Some clinics use a technique of measuring this dose with all beams delivered at a single gantry angle (collapsed delivery), as opposed to the beams delivered at t...

journal_title：Journal of applied clinical medical physics

authors： Conneely E,Alexander A,Ruo R,Chung E,Seuntjens J,Foley MJ

更新日期：2014-05-08 00:00:00

abstract：:This work illustrates a procedure to assess the overall accuracy associated with Gamma Knife treatment planning using plugging. The main role of source plugging or blocking is to create dose falloff in the junction between a target and a critical structure. We report the use of MAGAT gel dosimeter for verification of ...

journal_title：Journal of applied clinical medical physics

authors： Natanasabapathi G,Subbiah V,Kale SS,Rath GK,Senthilkumaran S,Thulkar S,Subramani V,Laviraj MA,Bisht RK,Mahapatra AK

更新日期：2012-11-08 00:00:00

abstract：:In this work, leakage radiation from EA200 series electron applicators on Siemens Primus accelerators is quantified, and its penetration ability in water and/or the shielding material Xenolite-NL established. Initially, measurement of leakage from 10 x 10 - 25 x 25 cm2 applicators was performed as a function of height...

journal_title：Journal of applied clinical medical physics

authors： Yeboah C,Karotki A,Hunt D,Holly R

更新日期：2010-06-15 00:00:00