Rounded leaf end modeling in Pinnacle VMAT treatment planning for fixed jaw linacs.

abstract：:The main purposes of this study are to: 1) evaluate the accuracy of XiO treatment planning system (TPS) for different dose calculation grid size based on head phan-tom measurements in uniform scanning proton therapy (USPT); and 2) compare the dosimetric results for various dose calculation grid sizes based on real com...

journal_title：Journal of applied clinical medical physics

authors： Rana S,Zheng Y

更新日期：2015-09-08 00:00:00

abstract：INTRODUCTION:Aim of this study is to dosimetrically characterize a new inorganic scintillator designed for magnetic resonance-guided radiotherapy (MRgRT) in the presence of 0.35 tesla magnetic field (B). METHODS:The detector was characterized in terms of signal to noise ratio (SNR), reproducibility, dose linearity, an...

journal_title：Journal of applied clinical medical physics

authors： Cusumano D,Placidi L,D'Agostino E,Boldrini L,Menna S,Valentini V,De Spirito M,Azario L

更新日期：2020-09-01 00:00:00

abstract：:This paper aims to evaluate the impact of spectral filtration on image quality in a microcomputed tomography (micro-CT) system. A mouse phantom comprising 11rods for modeling lung, muscle, adipose, and bones was scanned with 17 s and 2min, respectively. The current (μA) for each scan was adjusted to achieve identical ...

journal_title：Journal of applied clinical medical physics

authors： Ren L,Ghani MU,Wu D,Zheng B,Chen Y,Yang K,Wu X,Liu H

更新日期：2016-01-08 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：:A thorax phantom was used to assess radiotherapy dose deviations induced by respiratory motion of the target volume. Both intensity modulated and static, non-modulated treatment plans were planned on CT scans of the phantom. The plans were optimized using various CT reconstructions, to investigate whether they had an ...

journal_title：Journal of applied clinical medical physics

authors： Sande EPS,Acosta Roa AM,Hellebust TP

更新日期：2020-04-01 00:00:00

abstract：PURPOSE:This study aimed to evaluate dosimetric differences of intensity-modulated radiation therapy (IMRT) in target and normal tissues after breast-conserving surgery. METHODS:IMRT five-field plan I, IMRT six-field plan II, and field-in-field-direct machine parameter optimization-IMRT plan III were designed for each...

journal_title：Journal of applied clinical medical physics

authors： Zhang HW,Hu B,Xie C,Wang YL

更新日期：2018-05-01 00:00:00

abstract：:The case of a 50-year-old man affected by a rhabdomiosarcoma metastatic lesion in the left flank Is reported. The patient was addressed to 50.4 Gy radiotherapy with concomitant chemotherapy in order to locally control the lesion. A Tri-60-Co magnetic resonance hybrid radiotherapy unit was used for treatment delivery a...

journal_title：Journal of applied clinical medical physics

authors： Massaccesi M,Cusumano D,Boldrini L,Dinapoli N,Fionda B,Teodoli S,Azario L,Mattiucci GC,Balducci M,Cellini F,Valentini V

更新日期：2019-06-01 00:00:00

abstract：:This study extends the 'zero scan' method for CT imaging of polymer gel dosimeters to include multislice acquisitions. Multislice CT images consisting of 24 slices of 1.2 mm thickness were acquired of an irradiated polymer gel dosimeter and processed with the zero scan technique. The results demonstrate that zero scan...

journal_title：Journal of applied clinical medical physics

authors： Kakakhel MB,Kairn T,Charles P,Trapp JV

更新日期：2014-07-08 00:00:00

abstract：:The purpose of this study is to simulate random and systematic RapidArc delivery errors for external beam prostate radiotherapy plans in order to determine the dose sensitivity for each error type. Ten prostate plans were created with a single 360° arc. The DICOM files for these treatment plans were then imported into...

journal_title：Journal of applied clinical medical physics

authors： Oliver M,Bush K,Zavgorodni S,Ansbacher W,Beckham WA

更新日期：2011-05-20 00:00:00

abstract：PURPOSE:Segmentation of liver organ and tumors from computed tomography (CT) scans is an important task for hepatic surgical planning. Manual segmentation of liver and tumors is tedious, time-consuming, and biased to the clinician experience. Therefore, automatic segmentation of liver and tumors is highly desirable. It...

journal_title：Journal of applied clinical medical physics

authors： Alirr OI

更新日期：2020-10-01 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：PURPOSE:Prescription practice in SRS plans for brain tumors differs significantly for different modalities. In this retrospective study, the strategies to optimize SRS plans for brain tumors with volumetric arc therapy (VMAT) were presented. METHODS:Fifty clinically treated cases were stratified by the maximum target ...

journal_title：Journal of applied clinical medical physics

authors： Wang D,DeNittis A,Hu Y

更新日期：2020-03-01 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

abstract：:We assessed interfraction positional variation in pancreatic tumors using daily breath-hold cone-beam computed tomography at end-exhalation (EE) with visual feedback (BH-CBCT). Eleven consecutive patients with pancreatic cancer who underwent BH intensity-modulated radiation therapy with visual feedback were enrolled. ...

journal_title：Journal of applied clinical medical physics

authors： Nakamura M,Akimoto M,Ono T,Nakamura A,Yano S,Nakata M,Itasaka S,Mizowaki T,Shibuya K,Hiraoka M

更新日期：2015-03-08 00:00:00

abstract：PURPOSE:We introduce a technique that employs a 2D detector in transmission mode (TM) to verify dose maps at a depth of dmax in Solid Water. TM measurements, when taken at a different surface-to-detector distance (SDD), allow for the area at dmax (in which the dose map is calculated) to be adjusted. METHODS:We conside...

journal_title：Journal of applied clinical medical physics

authors： Utitsarn K,Biasi G,Stansook N,Alrowaili ZA,Petasecca M,Carolan M,Perevertaylo VL,Tomé WA,Kron T,Lerch MLF,Rosenfeld AB

更新日期：2019-11-01 00:00:00

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：: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：:Increasingly, the advent of multislice CT scanners, volume CT scanners, and total body spiral acquisition modes has led to the use of Multi Planar Reconstruction and 3D datasets. In considering 3D resolution properties of a CT system it is important to note that both the in-plane (x,y) and z-axis (slice thickness) inf...

journal_title：Journal of applied clinical medical physics

authors： Goodenough D,Levy J,Kristinsson S,Fredriksson J,Olafsdottir H,Healy A

更新日期：2016-09-08 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：OBJECTIVES:To evaluate the influence of MRI scanning parameters on texture analysis features. METHODS:Publicly available data from the Reference Image Database to Evaluate Therapy Response (RIDER) project sponsored by The Cancer Imaging Archive included MRIs on a phantom comprised of 18 25-mm doped, gel-filled tubes, ...

journal_title：Journal of applied clinical medical physics

authors： Buch K,Kuno H,Qureshi MM,Li B,Sakai O

更新日期：2018-11-01 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：:Prostate cancer radiotherapy workflows, solely based on magnetic resonance imaging (MRI), are now in clinical use. In these workflows, intraprostatic gold fiducial markers (GFM) show similar signal behavior as calcifications and bleeding in T2-weighted MRI-images. Accurate GFM identification in MRI-only radiotherapy w...

journal_title：Journal of applied clinical medical physics

authors： Gustafsson C,Persson E,Gunnlaugsson A,Olsson LE

更新日期：2018-11-01 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：PURPOSE:This study evaluates the clinical use of the RUBY modular QA phantom for linac QA to validate the integrity of IGRT workflows including the congruence of machine isocenter, imaging isocenter, and room lasers. The results have been benchmarked against those obtained with widely used systems. Additionally, the RU...

journal_title：Journal of applied clinical medical physics

authors： Poppinga D,Kretschmer J,Brodbek L,Meyners J,Poppe B,Looe HK

更新日期：2020-10-01 00:00:00

abstract：:Recently, specific computed tomography (CT) scanners have been equipped with organ-based tube current modulation (TCM) technology. It is possible that organ-based TCM will replace the conventional dose-reduction technique of reducing the effective milliampere-second. The aim of this study was to determine if organ-bas...

journal_title：Journal of applied clinical medical physics

authors： Matsubara K,Sugai M,Toyoda A,Koshida H,Sakuta K,Takata T,Koshida K,Iida H,Matsui O

更新日期：2012-03-08 00:00:00

abstract：PURPOSE:The purpose of this study was to introduce a new algorithm for automated measurement of the modulation transfer function (MTF) using an edge of a readily available phantom and to evaluate the effect of reconstruction filter and field of view (FOV) on the spatial resolution in the CT images. METHODS:Our automat...

journal_title：Journal of applied clinical medical physics

authors： Anam C,Fujibuchi T,Budi WS,Haryanto F,Dougherty G

更新日期：2018-11-01 00:00:00

abstract：:The dosimetry of very small electron fields can be challenging due to relative shifts in percent depth-dose curves, including the location of dmax, and lack of lateral electronic equilibrium in an ion chamber when placed in the beam. Conventionally a small parallel plate chamber or film is utilized to perform small fi...

journal_title：Journal of applied clinical medical physics

authors： Amin MN,Heaton R,Norrlinger B,Islam MK

更新日期：2010-10-04 00:00:00

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：:The aim of this work is to evaluate the performance of a commercial brachytherapy treatment planning system (TPS) with TG-43 Vendors Input Data (VID), analyze possible discrepancies with respect to a proper reference source and its implications for standard treatments, and judge the effectiveness of certain widespread...

journal_title：Journal of applied clinical medical physics

authors： Valdés CN,Píriz GH,Lozano E

更新日期：2015-07-08 00:00:00

abstract：:The use of a radioactive check device containing Strontium 90 was investigated to carry out the redundancy checks of Farmer-type ionization chambers. It was not possible to meet the recommended tolerance limits of the redundancy checks without taking into account the angular response of the ionization chambers. The io...

journal_title：Journal of applied clinical medical physics

authors： Sidhu NP,Rouvas A,Cadman P

更新日期：2000-10-01 00:00:00