Radiographic film dosimetry for IMRT fields in the nearsurface buildup region.

abstract：OBJECTIVE:To evaluate the accuracy of a deep learning-based auto-segmentation mode to that of manual contouring by one medical resident, where both entities tried to mimic the delineation "habits" of the same clinical senior physician. METHODS:This study included 125 cervical cancer patients whose clinical target volu...

journal_title：Journal of applied clinical medical physics

authors： Wang Z,Chang Y,Peng Z,Lv Y,Shi W,Wang F,Pei X,Xu XG

更新日期：2020-12-01 00:00:00

abstract：:Measurement of cumulative dose ƒ(0,150) with a small ionization chamber within standard polymethyl methacrylate (PMMA) CT head and body phantoms, 150 mm in length, is a possible practical method for cone-beam computed tomography (CBCT) dosimetry. This differs from evaluating cumulative dose under scatter equilibrium c...

journal_title：Journal of applied clinical medical physics

authors： Abuhaimed A,Martin CJ,Sankaralingam M,Oomen K,Gentle DJ

更新日期：2015-11-08 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 investigate amplitude gating combined with a coached breathing strategy for 10 MV flattening filter-free (FFF) volumetric-modulated arc therapy (VMAT) on the Varian TrueBeam linac. Ten patient plans for VMAT SABR liver were created using the Eclipse treatment planning system (TPS). The...

journal_title：Journal of applied clinical medical physics

authors： Viel F,Lee R,Gete E,Duzenli C

更新日期：2015-07-08 00:00:00

abstract：:Significant controversy surrounds the 2012 / 2014 decision announced by the Trustees of the American Board of Radiology (ABR) in October of 2007. According to the ABR, only medical physicists who are graduates of a Commission on Accreditation of Medical Physics Education Programs, Inc. (CAMPEP) accredited academic or ...

journal_title：Journal of applied clinical medical physics

authors： Mills MD,Thornewill J,Esterhay RJ

更新日期：2010-04-12 00:00:00

abstract：:We report on initial patient studies to evaluate the performance of a commercial respiratory gating radiotherapy system. The system uses a breathing monitor, consisting of a video camera and passive infrared reflective markers placed on the patient's thorax, to synchronize radiation from a linear accelerator with the ...

journal_title：Journal of applied clinical medical physics

authors： Mageras GS,Yorke E,Rosenzweig K,Braban L,Keatley E,Ford E,Leibel SA,Ling CC

更新日期：2001-10-01 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 describe a method for independently verifying the dose distributions from pre- and post-implant brachytherapy source distributions. Monte Carlo calculations have been performed to characterize the three-dimensional dose distribution in water phantom from a low-energy brachytherapy source. The calculations are perfo...

journal_title：Journal of applied clinical medical physics

authors： DeMarco JJ,Solberg TD,Agazaryan N

更新日期：2003-01-01 00:00:00

abstract：:A quality assurance (QA) procedure was developed to evaluate the congruence between the cone-beam computed tomography (CBCT) image center and the radiation isocenter on a Varian Trilogy linac. In contrast to the published QA procedures, this method did not require a ball bearing (BB) phantom to be placed exactly at th...

journal_title：Journal of applied clinical medical physics

authors： Du W,Yang JN,Chang EL,Luo D,McAleer MF,Shiu A,Martel MK

更新日期：2010-07-02 00:00:00

abstract：PURPOSE:To report our early experiences with failure mode and effects analysis (FMEA) in a community practice setting. METHODS:The FMEA facilitator received extensive training at the AAPM Summer School. Early efforts focused on department education and emphasized the need for process evaluation in the context of high ...

journal_title：Journal of applied clinical medical physics

authors： Schuller BW,Burns A,Ceilley EA,King A,LeTourneau J,Markovic A,Sterkel L,Taplin B,Wanner J,Albert JM

更新日期：2017-11-01 00:00:00

abstract：:Multileaf collimator (MLC) tracking represents a promising technique for motion management in radiotherapy. However, the conflict between limited leaf speed/acceleration and the demand for tracking fast target motion is now a prominent issue. Conventional MLCs typically have a maximum leaf speed of 3-4 cm/s and a maxi...

journal_title：Journal of applied clinical medical physics

authors： Zhang X,Ye P,Zhang H

更新日期：2017-01-01 00:00:00

abstract：OBJECTIVES:To compare the effectiveness of two different patient size metrics based on water equivalent diameter (Dw ), the mid-scan water equivalent diameter Dw_c , and the mean (average) water equivalent diameter in the imaged region, Dw_ave , for automatic detection of accidental changes in computed tomography (CT) ...

journal_title：Journal of applied clinical medical physics

authors： Sarmento S,Mendes B,Gouvêa M

更新日期：2018-01-01 00:00:00

abstract：:The accuracy of the CyberKnife Synchrony Respiratory Tracking System (SRTS) is considered to be patient-dependent because the SRTS relies on an individual correlation between the internal tumor position (ITP) and the external marker position (EMP), as well as a prediction method to compensate for the delay incurred to...

journal_title：Journal of applied clinical medical physics

authors： Inoue M,Shiomi H,Iwata H,Taguchi J,Okawa K,Kikuchi C,Inada K,Iwabuchi M,Murai T,Koike I,Tatewaki K,Ohta S,Inoue T

更新日期：2015-01-08 00:00:00

abstract：:PET/CT imaging could improve delineation of rectal carcinoma gross tumor volume (GTV) and reduce interobserver variability. The objective of this work was to compare various functional volume delineation algorithms. We enrolled 31 consecutive patients with locally advanced rectal carcinoma. The FDG PET/CT and the high...

journal_title：Journal of applied clinical medical physics

authors： Withofs N,Bernard C,Van der Rest C,Martinive P,Hatt M,Jodogne S,Visvikis D,Lee JA,Coucke PA,Hustinx R

更新日期：2014-09-08 00:00:00

abstract：:Physical and dosimetric characteristics of HDMLC were studied for SRS6, 6, and 10 MV X-rays from Novalis Tx. This in-built tertiary collimator consists of 60 pairs (32 × 0.25 cm; 26 × 0.5 cm and 2 × 0.7 cm) of leaves. Properties of HDMLC studied included alignment, readout and radiation field congruence, radiation pen...

journal_title：Journal of applied clinical medical physics

authors： Sharma DS,Dongre PM,Mhatre V,Heigrujam M

更新日期：2011-04-14 00:00:00

abstract：PURPOSE:Volumetric modulated arc therapy (VMAT) is gaining popularity for stereotactic treatment of lung lesions for medically inoperable patients. Due to multiple beamlets in delivery of highly modulated VMAT plans, there are dose delivery uncertainties associated with small-field dosimetry error and interplay effects...

journal_title：Journal of applied clinical medical physics

authors： Pokhrel D,Visak J,Sanford L

更新日期：2020-07-01 00:00:00

abstract：:The purpose of this study is to describe the comprehensive commissioning process and initial clinical experience of the Mevion S250 proton therapy system, a gantry-mounted, single-room proton therapy platform clinically implemented in the S. Lee Kling Proton Therapy Center at Barnes-Jewish Hospital in St. Louis, MO, U...

journal_title：Journal of applied clinical medical physics

authors： Zhao T,Sun B,Grantham K,Rankine L,Cai B,Goddu SM,Santanam L,Knutson N,Zhang T,Reilly M,Bottani B,Bradley J,Mutic S,Klein EE

更新日期：2016-03-08 00:00:00

abstract：PURPOSE:Two different respiratory monitoring systems (Varian's Real-Time Position Management (RPM) System and Siemens' ANZAI belt Respiratory Gating System) are compared in the context of respiratory signals and 4D CT images that are accordingly reconstructed. This study aims to evaluate the feasibility of combined use...

journal_title：Journal of applied clinical medical physics

authors： Liu J,Lin T,Fan J,Chen L,Price R,Ma CC

更新日期：2018-09-01 00:00:00

abstract：:The purpose of this study was to compare two different styles of prostate IGRT: bony landmark (BL) setup vs. fiducial markers (FM) setup. Twenty-nine prostate patients were treated with daily BL setup and 30 patients with daily FM setup. Delivered dose distribution was reconstructed on cone-beam CT (CBCT) acquired onc...

journal_title：Journal of applied clinical medical physics

authors： Paluska P,Hanus J,Sefrova J,Rouskova L,Grepl J,Jansa J,Kasaova L,Hodek M,Zouhar M,Vosmik M,Petera J

更新日期：2013-05-06 00:00:00

abstract：PURPOSE:The aim of the current study was to evaluate the backscatter dose and energy spectrum from the Lipiodol with flattening filter (FF) and flattening filter-free (FFF) beams. Moreover, the backscatter range, that was defined as the backscatter distance (BD) are revealed. METHODS:6 MVX FF and FFF beams were delive...

journal_title：Journal of applied clinical medical physics

authors： Kawahara D,Ozawa S,Kimura T,Saito A,Nakashima T,Ohno Y,Murakami Y,Nagata Y,Shiinoki T

更新日期：2019-06-01 00:00:00

abstract：:The increasing popularity of intensity-modulated arc therapy (IMAT) treatments requires specifically designed linac quality assurance (QA) programs. Gantry angle is one of the parameters that has a major effect on the outcome of IMAT treatments since dose reconstruction for patient-specific QA relies on the gantry ang...

journal_title：Journal of applied clinical medical physics

authors： Rowshanfarzad P,Sabet M,O'Connor DJ,McCowan PM,McCurdy BM,Greer PB

更新日期：2012-11-08 00:00:00

abstract：:Breast treatments are becoming increasingly complex as the use of modulated and partial breast therapies becomes more prevalent. These methods are predicated on accurate and precise positioning for treatment. However, the ability to quantify intrafraction motion has been limited by the excessive dose that would result...

journal_title：Journal of applied clinical medical physics

authors： Wiant DB,Wentworth S,Maurer JM,Vanderstraeten CL,Terrell JA,Sintay BJ

更新日期：2014-11-08 00:00:00

abstract：PURPOSE:We conducted this dosimetric analysis to evaluate the feasibility of a multi-center stereotactic body radiation therapy (SBRT) trial for renal cell carcinoma (RCC) using different SBRT platforms. MATERIALS/METHODS:The computed tomography (CT) simulation images of 10 patients with unilateral RCC previously trea...

journal_title：Journal of applied clinical medical physics

authors： Baydoun A,Vapiwala N,Ponsky LE,Awan M,Kassaee A,Sutton D,Podder TK,Zhang Y,Dobbins D,Muzic RF Jr,Traughber B,Machtay M,Ellis R

更新日期：2018-03-14 00:00:00

abstract：:The image-guided radiotherapy technique (IGRT) makes use of imaging devices to verify the positions of the target volume and organs at risk during the treatment sessions. In this work we evaluate the image quality provided by an imaging system based on a kilovoltage cone-beam CT, and explore its ability to perform IGR...

journal_title：Journal of applied clinical medical physics

authors： Garayoa J,Castro P

更新日期：2013-01-07 00:00:00

abstract：:Magnetic resonance imaging (MRI) is regularly used for stereotactic imaging of Gamma Knife (GK) radiosurgery patients for GK treatment planning. MRI-induced thermal injuries have occurred and been reported for GK patients with attached metallic headframes. Depending on the specific MR imaging and headframe conditions,...

journal_title：Journal of applied clinical medical physics

authors： Bennett MC,Wiant DB,Gersh JA,Dolesh W,Ding X,Best RC,Bourland JD

更新日期：2012-07-05 00:00:00

abstract：PURPOSE:We report the first cervical cancer cases treated with interstitial electronic brachytherapy (eBT) at our hospital and compare them with plans made with high-dose-rate interstitial brachytherapy based on Ir192 (HDR-BT). MATERIALS AND METHODS:Eight patients with cervical cancer were treated with the Axxent eBT ...

journal_title：Journal of applied clinical medical physics

authors： Lozares-Cordero S,Font-Gómez JA,Gandía-Martínez A,Miranda-Burgos A,Méndez-Villamón A,Villa-Gazulla D,Alba-Escorihuela V,Jiménez-Puertas S,González-Pérez V

更新日期：2019-07-01 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：: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：PURPOSE:To investigate the daily setup, interfraction motion, variability in the junction areas, and dosimetric effect in craniospinal irradiation (CSI) patients. METHODS:Fifteen CSI patients who had undergone split-field IMRT were followed in the study. Previous, middle, and posttreatment, each target volume position...

journal_title：Journal of applied clinical medical physics

authors： Duan X,Zhou Y,Dai H,Zhao L,Qian J,Yang D,Zhang L,Luo C,Li G

更新日期：2020-08-01 00:00:00

abstract：:Detection and accurate quantification of treatment delivery errors is important in radiation therapy. This study aims to evaluate the accuracy of DVH based QA in quantifying delivery errors. Eighteen previously treated VMAT plans (prostate, H&N, and brain) were randomly chosen for this study. Conventional IMRT deliver...

journal_title：Journal of applied clinical medical physics

authors： Ma T,Podgorsak MB,Kumaraswamy LK

更新日期：2016-09-08 00:00:00