A dosimetric comparison of stereotactic body radiation therapy techniques for lung cancer: robotic versus conventional linac-based systems.

abstract：:A method to evaluate the electron beam energy constancy by employing the computed radiography (CR) system has been developed. In this method, a right triangular plastic wedge is used to produce a curve of the CR storage phosphor plate signal versus the wedge thickness. The curve, which resembles the percentage depth i...

journal_title：Journal of applied clinical medical physics

authors： Cai YC,Ge Y,Bernard D,Turian J,Chu JCH

更新日期：2009-10-15 00:00:00

abstract：:This paper investigates the accuracy of the two available calculation algorithms of the Oncentra MasterPlan three-dimensional treatment planning system (TPS)-- the pencil beam method and collapsed-cone convolution--in modeling the Varian enhanced dynamic wedge (EDW). Measurements were carried out for a dual high energ...

journal_title：Journal of applied clinical medical physics

authors： Pasquino M,Borca VC,Tofani S,Ozzello F

更新日期：2009-04-22 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：:A Histogram Analysis in Radiation Therapy (HART) program was primarily developed to increase the efficiency and accuracy of dose-volume histogram (DVH) analysis of large quantities of patient data in radiation therapy research. The program was written in MATLAB to analyze patient plans exported from the treatment plan...

journal_title：Journal of applied clinical medical physics

authors： Pyakuryal A,Myint WK,Gopalakrishnan M,Jang S,Logemann JA,Mittal BB

更新日期：2010-01-28 00:00:00

abstract：:Locally advanced non-small-cell lung cancer (NSCLC) is a common disease with a low overall survival even with aggressive treatments. Standard imaging (CT and PET/CT) provide no information about normal lung function. We therefore, sought to pilot HeMRI in patients with non-small-cell lung cancer before and after defin...

journal_title：Journal of applied clinical medical physics

authors： Allen AM,Albert M,Caglar HB,Zygmanski P,Soto R,Killoran J,Sun Y

更新日期：2011-01-31 00:00:00

abstract：:Continuous arterial spin labeling (CASL) is a technique for performing quantitative perfusion measurements without the need for exogenous contrast agent administration. This technique has seen limited use in the clinic due to problems of poor sensitivity and the potential for artifacts. In addition, CASL requires the ...

journal_title：Journal of applied clinical medical physics

authors： Steger TR,Jackson EF

更新日期：2005-01-01 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：: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：: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：:Wireless capsule endoscopy (WCE) is an effective technology that can be used to make a gastrointestinal (GI) tract diagnosis of various lesions and abnormalities. Due to a long time required to pass through the GI tract, the resulting WCE data stream contains a large number of frames which leads to a tedious job for c...

journal_title：Journal of applied clinical medical physics

authors： Pogorelov K,Suman S,Azmadi Hussin F,Saeed Malik A,Ostroukhova O,Riegler M,Halvorsen P,Hooi Ho S,Goh KL

更新日期：2019-08-01 00:00:00

abstract：:In Winston-Lutz (WL) tests, the isocenter of a linear accelerator (linac) is determined as the intersection of radiation central axes (CAX) from multiple gantry, collimator, and couch angles. It is well known that the CAX can wobble due to mechanical imperfections of the linac. Previous studies suggested that the wobb...

journal_title：Journal of applied clinical medical physics

authors： Du W,Johnson JL,Jiang W,Kudchadker RJ

更新日期：2016-01-08 00:00:00

abstract：PURPOSE:We introduce an automated, quantitative image analysis package for gamma camera and single photon emission computed tomography quality control. Our focus was to produce consistent methods that are feasible in clinical settings and use standard phantoms. METHODS:Four gamma cameras were used to acquire planar im...

journal_title：Journal of applied clinical medical physics

authors： Tazegul TE,Polemi AM,Snyder A,Snyder C,Collins PG

更新日期：2020-11-03 00:00:00

abstract：:While a few physicists have designed new plan check automation solutions for their clinics, fewer, if any, managed to adapt existing solutions. As complex and varied as the systems they check, these programs must gain the full confidence of those who would run them on countless patient plans. The present automation ef...

journal_title：Journal of applied clinical medical physics

authors： Halabi T,Lu HM

更新日期：2014-07-08 00:00:00

abstract：PURPOSE:To investigate the differences between internal target volumes (ITVs) contoured on the simulation 4DCT and daily 4DCBCT images for lung cancer patients treated with stereotactic body radiotherapy (SBRT) and determine the dose delivered on 4D planning technique. METHODS:For nine patients, 4DCBCTs were acquired ...

journal_title：Journal of applied clinical medical physics

authors： Dumas M,Laugeman E,Sevak P,Snyder KC,Mao W,Chetty IJ,Ajlouni M,Wen N

更新日期：2020-10-12 00:00:00

abstract：:The American Association of Physicists in Medicine (AAPM) is a nonprofit professional society whose primary purposes are to advance the science, education and professional practice of medical physics. The AAPM has more than 8,000 members and is the principal organization of medical physicists in the United States. The...

journal_title：Journal of applied clinical medical physics

authors： Smilowitz JB,Das IJ,Feygelman V,Fraass BA,Kry SF,Marshall IR,Mihailidis DN,Ouhib Z,Ritter T,Snyder MG,Fairobent L,AAPM Medical Physics Practice Guideline Task Group.

更新日期：2015-09-08 00:00:00

abstract：:Remote afterloading devices used for high-dose-rate (HDR) brachytherapy may be supplied with different sources, and these sources typically have differing initial source strengths. In addition, the proposed frequency for source changes may also vary, depending upon the source type. Dosimetric parameters unique to each...

journal_title：Journal of applied clinical medical physics

authors： Davis SD,Parker W,Evans MD

更新日期：2013-11-04 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 nonphysical wedge is a modality that uses computer-controlled jaw motion to generate wedge-shaped dose distributions. There are Varian enhanced dynamic wedges (EDWs) and Siemens virtual wedges (VWs). We recently commissioned dynamic wedges on both Varian and Siemens LINACs. The beam data, acquired with a Wellhofer...

journal_title：Journal of applied clinical medical physics

authors： Shao H,Wu X,Luo C,Crooks A,Bernstein A,Markoe A

更新日期：2004-10-01 00:00:00

abstract：:This study evaluated the basic dosimetric characteristics of a Dynamic Multi Leaf Collimator (DMLC) using a diode detector and film measurements for Intensity Modulated Radiation Therapy Quality Assurance (IMRT QA). The EGSnrc Monte Carlo (MC) simulation system was used for the determination of MLC characteristics. Ra...

journal_title：Journal of applied clinical medical physics

authors： Molazadeh M,Zeinali A,Robatjazi M,Shirazi A,Geraily G

更新日期：2017-03-01 00:00:00

abstract：:Flattening filter-free (FFF) beams produce higher dose rates. Combined with compensator-based intensity modulated radiotherapy (IMRT) techniques, the dose delivery for each beam can be much shorter compared to the flattened beam MLC-based or flattened beam compensator-based IMRT. This 'snap shot' IMRT delivery is bene...

journal_title：Journal of applied clinical medical physics

authors： Zhang DG,Feygelman V,Moros EG,Latifi K,Hoffe S,Frakes J,Zhang GG

更新日期：2017-01-01 00:00:00

abstract：PURPOSE:To assess the impact of isocenter shifts due to linac gantry and table rotation during cranial stereotactic radiosurgery on D98 , target volume coverage (TVC), conformity (CI), and gradient index (GI). METHODS:Winston-Lutz (WL) checks were performed on two Elekta Synergy linacs. A stereotactic quality assuranc...

journal_title：Journal of applied clinical medical physics

authors： Wack LJ,Exner F,Wegener S,Sauer OA

更新日期：2020-05-01 00:00:00

abstract：:The assessment of intracranial aneurysms is increasingly performed using three-dimensional cone-beam rotational angiography (3D CBRA). To reduce the dose to the patient during 3D CBRA procedures, filtered region-of-interest imaging (FROI) is presented in literature to be an effective technique as the dose in regions o...

journal_title：Journal of applied clinical medical physics

authors： Göpfert F,Schmidt R,Wulff J,Zink K

更新日期：2015-03-08 00:00:00

abstract：:We report our technique for hemibody skin electron irradiation with a custom-made plywood shield. The technique is similar to our clinical total skin electron irradiation (TSEI), performed with a six-pair dual field (Stanford technique) at an extended source-to-skin distance (SSD) of 377 cm, with the addition of a ply...

journal_title：Journal of applied clinical medical physics

authors： Rivers CI,AlDahlawi I,Wang IZ,Singh AK,Podgorsak MB

更新日期：2016-11-08 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：:Many head-and-neck cancer (HNC) patients treated with radiotherapy suffer significant anatomical changes due to tumor shrinkage or weight loss. The purpose of this study was to assess dose changes over target volumes and organs at risk during intensity-modulated radiotherapy for HNC patients. Sixteen HNC IMRT patients...

journal_title：Journal of applied clinical medical physics

authors： Beltran M,Ramos M,Rovira JJ,Perez-Hoyos S,Sancho M,Puertas E,Benavente S,Ginjaume M,Giralt J

更新日期：2012-11-08 00:00:00

abstract：:In this work, the feasibility of using flattening filter free (FFF) beams in volumetric modulated arc therapy (VMAT) total body irradiation (TBI) treatment planning to decrease protracted beam-on times for these treatments was investigated. In addition, a methodology was developed to generate standardized VMAT TBI tre...

journal_title：Journal of applied clinical medical physics

authors： Frederick R,Hudson A,Balogh A,Cao JQ,Pierce G

更新日期：2020-03-01 00:00:00

abstract：:The authors compared the relative dosimetric merits of Gamma Knife (GK) and CyberKnife (CK) in 15 patients with 26 brain metastases. All patients were initially treated with the Leksell GK 4C. The same patients were used to generate comparative CK treatment plans. The tissue volume receiving more than 12 Gy (V12), the...

journal_title：Journal of applied clinical medical physics

authors： Sio TT,Jang S,Lee SW,Curran B,Pyakuryal AP,Sternick ES

更新日期：2014-01-06 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：:The use of solid carbon fiber table materials in radiotherapy has become more common with the implementation of image-guided radiotherapy (IGRT), since the solid materials give less imaging artifacts than the so-called tennis racket couchtops. The downside of the solid carbon fiber couch inserts is that they increase ...

journal_title：Journal of applied clinical medical physics

authors： Seppälä JK,Kulmala JA

更新日期：2011-11-15 00:00:00

abstract：INTRODUCTION:A previous pilot study has demonstrated the feasibility of a novel image-based approach for remote dosimetric auditing of clinical trials. The approach uses a model to convert in-air acquired intensity modulated radiotherapy (IMRT) images to delivered dose inside a virtual phantom. The model was developed ...

journal_title：Journal of applied clinical medical physics

authors： Miri N,Vial P,Greer PB

更新日期：2019-01-01 00:00:00