Shielding assessment of a mobile electron accelerator for intra-operative radiotherapy.

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

abstract：:Atlas-based autosegmentation is an established tool for segmenting structures for CT-planned head and neck radiotherapy. MRI is being increasingly integrated into the planning process. The aim of this study is to assess the feasibility of MRI-based, atlas-based autosegmentation for organs at risk (OAR) and lymph node ...

journal_title：Journal of applied clinical medical physics

authors： Wardman K,Prestwich RJ,Gooding MJ,Speight RJ

更新日期：2016-07-08 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：: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：:Reducing the treatment time for IMRT patients is highly desirable. The objective of this work was to evaluate the new clinical Siemens KonRad inverse treatment planning system (TPS) and compare it to the CMS XiO TPS with special emphasis on the segmentation efficiency. For head and neck, liver and prostate cancer pati...

journal_title：Journal of applied clinical medical physics

authors： Reitz B,Miften M

更新日期：2008-07-14 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：:Special attention is required in planning and administering radiation therapy to patients with cardiac implantable electronic devices (CIEDs), such as pacemaker and defibrillator. The range of dose to CIEDs that can induce malfunction is large among CIEDs. Clinically significant defects have been reported at dose as l...

journal_title：Journal of applied clinical medical physics

authors： Yan H,Guo F,Zhu D,Stryker S,Trumpore S,Roberts K,Higgins S,Nath R,Chen Z,Liu W

更新日期：2018-01-01 00:00:00

abstract：PURPOSE:This study evaluates the feasibility of lung dose prediction based on target contour and patient anatomy for breast patients treated with proton therapy. METHODS:Fifty-two randomly selected patients were included in the cohort, who were treated to 50.4-66.4 Gy(RBE) to the left (36), right (15), or bilateral (1...

journal_title：Journal of applied clinical medical physics

authors： Zeng C,Sine K,Mah D

更新日期：2018-11-01 00:00:00

abstract：PURPOSE:Previous studies suggest that within radiation oncology, medical physicists (MP) experience high workloads. Little is known about how MPs use social support (SS) in times of stress. METHODS:In collaboration with the Workgroup on Prevention of Medical Error, the American Association of Physicists in Medicine ad...

journal_title：Journal of applied clinical medical physics

authors： Johnson J,Ford E,Yu J,Buckey C,Fogh S,Evans SB

更新日期：2019-09-01 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 objective of this work is the investigation of intense pulsed light (IPL) photoepilation using Monte Carlo simulation to model the effect of the output dosimetry with millisecond exposure used by typical commercial IPL systems. The temporal pulse shape is an important parameter, which may affect the biological tis...

journal_title：Journal of applied clinical medical physics

authors： Ash C,Donne K,Daniel G,Town G,Clement M,Valentine R

更新日期：2012-09-06 00:00:00

abstract：:Beam quality correction kQQo (r), which reflects the absorbed energy dependence of the detector, is calculated for solid state detector materials diamond, LiF, Li2B4O7 and Al2O3 for the 137Cs RTR brachytherapy source using the Monte Carlo-based EGSnrc code system. The study also includes calculation of detector-specif...

journal_title：Journal of applied clinical medical physics

authors： Selvam TP,Mishra S,Vishwakarma RS

更新日期：2014-01-06 00:00:00

abstract：:Modern three-dimensional image-guided intracavitary high dose rate (HDR) brachytherapy is often used in combination with external beam radiotherapy (EBRT) to manage cervical cancer. Intrafraction motion of critical organs relative to the HDR applicator in the time between the planning CT and treatment delivery can cau...

journal_title：Journal of applied clinical medical physics

authors： Liu H,Kinard J,Maurer J,Shang Q,Vanderstraeten C,Hayes L,Sintay B,Wiant D

更新日期：2018-11-01 00:00:00

abstract：:The purpose of this study is to determine whether organ sparing and target coverage can be simultaneously maintained for pencil beam scanning (PBS) proton therapy treatment of thoracic tumors in the presence of motion, stopping power uncertainties, and patient setup variations. Ten consecutive patients that were previ...

journal_title：Journal of applied clinical medical physics

authors： Lin L,Kang M,Huang S,Mayer R,Thomas A,Solberg TD,McDonough JE,Simone CB 2nd

更新日期：2015-11-08 00:00:00

abstract：PURPOSE:The goal of this study was to find the optimal combination of collimator, photopeak and scatter correction for 177 Lutetium (177 Lu) SPECT/CT imaging. METHODS:Three experiments [sphere-to-background ratios (SBR) 50:1, 10:1, and 2:1] were performed with the NEMA Image Quality phantom filled with 177 Lu-trichlor...

journal_title：Journal of applied clinical medical physics

authors： Huizing DMV,Sinaasappel M,Dekker MC,Stokkel MPM,de Wit-van der Veen BJ

更新日期：2020-09-01 00:00:00

abstract：:Intraoperative electron radiation therapy (IOERT) cannot usually benefit, as conventional external radiotherapy, from software systems of treatment planning based on computed tomography and from common dose verify procedures. For this reason, in vivo film dosimetry (IVFD) proves to be an effective methodology to evalu...

journal_title：Journal of applied clinical medical physics

authors： Severgnini M,de Denaro M,Bortul M,Vidali C,Beorchia A

更新日期：2014-01-08 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：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：:Shewhart control charts have previously been suggested as a process control tool for use in routine linear accelerator (linac) output verifications. However, a comprehensive approach to process control has not been investigated for linac output verifications. The purpose of this work is to investigate a comprehensive ...

journal_title：Journal of applied clinical medical physics

authors： Sanghangthum T,Suriyapee S,Srisatit S,Pawlicki T

更新日期：2013-01-07 00:00:00

abstract：:A new calculation algorithm has been developed for independently verifying doses calculated by the TomoTherapy Hi.Art treatment planning system (TPS). The algorithm is designed to confirm the dose to a point in a high dose, low dose-gradient region. Patient data used by the algorithm include the radiological depth to ...

journal_title：Journal of applied clinical medical physics

authors： Gibbons JP,Smith K,Cheek D,Rosen I

更新日期：2009-02-05 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：: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：:A patient specific quality assurance (QA) should detect errors that originate anywhere in the treatment planning process. However, the increasing complexity of treatment plans has increased the need for improvements in the accuracy of the patient specific pretreatment verification process. This has led to the utilizat...

journal_title：Journal of applied clinical medical physics

authors： Defoor DL,Stathakis S,Roring JE,Kirby NA,Mavroidis P,Obeidat M,Papanikolaou N

更新日期：2017-07-01 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：:Two patients with multiple lung metastases (≥ 5) were treated using frameless stereotactic body radiation therapy (SBRT) on an Elekta Axesse linear accelerator equipped with an interdigitation-capable multileaf collimator and four-dimensional cone-beam CT (4D CBCT). The technique and the early clinical outcomes were e...

journal_title：Journal of applied clinical medical physics

authors： Li Q,Mu J,Gu W,Chen Y,Ning Z,Jin J,Pei H

更新日期：2014-07-08 00:00:00

abstract：:This study investigates the dosimetry and radiobiological model variation when a second photon arc was added to prostate volumetric-modulated arc therapy (VMAT) using the single-arc technique. Dosimetry and radiobiological model comparison between the single-arc and double-arc prostate VMAT plans were performed on fiv...

journal_title：Journal of applied clinical medical physics

authors： Chow JC,Jiang R

更新日期：2013-05-06 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：:External beam radiation therapy (RT) is often offered to breast cancer patients after surgical mastectomy followed by breast reconstruction with silicone implants. In some cases, the RT is administered while the patient is still implanted with a temporary tissue expander including a high-density metallic port, which i...

journal_title：Journal of applied clinical medical physics

authors： Chatzigiannis C,Lymperopoulou G,Sandilos P,Dardoufas C,Yakoumakis E,Georgiou E,Karaiskos P

更新日期：2011-01-19 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 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