Dose perturbation due to the polysulfone cap surrounding a Fletcher-Williamson colpostat.

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：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：:A low-energy (50 kV) X-ray tube used for the stereotactic irradiation of intracranial lesions has been in use since 1999. The unit is calibrated prior to every procedure and during periodic quality assurance (QA) tests. The unit uses an internal and an external scintillation detector to monitor dose as well as a conve...

journal_title：Journal of applied clinical medical physics

authors： Biggs PJ

更新日期：2006-08-24 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：: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 evaluated unexpected dosimetric errors caused by machine control accuracy, patient setup errors, and patient weight changes/internal organ deformations. Trajectory log files for 13 gynecologic plans with seven- or nine-beam dynamic multileaf collimator (MLC) intensity-modulated radiation therapy (IMRT), and...

journal_title：Journal of applied clinical medical physics

authors： Utena Y,Takatsu J,Sugimoto S,Sasai K

更新日期：2021-01-10 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：:The purpose of this study was to evaluate the dose differences introduced by the TMR 10 and the convolution dose calculation algorithms in GammaPlan version 10, as compared to the TMR classic algorithm in the previous versions of GammaPlan. Computed axial tomographic images of a polystyrene phantom and a human head we...

journal_title：Journal of applied clinical medical physics

authors： Xu AY,Bhatnagar J,Bednarz G,Niranjan A,Flickinger J,Lunsford LD,Huq MS

更新日期：2014-09-08 00:00:00

abstract：:Peripheral lung lesions treated with a single fraction of stereotactic ablative body radiotherapy (SABR) utilizing volumetric modulated arc therapy (VMAT) delivery and flattening filter-free (FFF) beams represent a potentially high-risk scenario for clinically significant dose blurring effects due to interplay between...

journal_title：Journal of applied clinical medical physics

authors： Burton A,Offer K,Hardcastle N

更新日期：2020-08-01 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：: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：:Magnetic Resonance Imaging (MRI) simulation differs from diagnostic MRI in purpose, technical requirements, and implementation. We propose a semiautomatic method for image acceptance and commissioning for the scanner, the radiofrequency (RF) coils, and pulse sequences for an MRI simulator. The ACR MRI accreditation la...

journal_title：Journal of applied clinical medical physics

authors： Chen X,Dai J

更新日期：2018-05-01 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：:Small field dosimetry is a challenging task. The difficulties of small field measurements, particularly stereotactic field size measurements, are highlighted by the large interinstitution variability that can be observed for circular cone collimator commissioning measurements. We believe the best way to improve the co...

journal_title：Journal of applied clinical medical physics

authors： Wiant DB,Terrell JA,Maurer JM,Yount CL,Sintay BJ

更新日期：2013-11-04 00:00:00

abstract：:MIM Symphony is a recently introduced low-dose-rate prostate brachytherapy treatment planning system (TPS). We evaluated the dosimetric and planning accuracy of this new TPS compared to the universally used VariSeed TPS. For dosimetric evaluation of the MIM Symphony version 5.4 TPS, we compared dose calculations from ...

journal_title：Journal of applied clinical medical physics

authors： Dhanesar SK,Lim TY,Du W,Bruno TL,Frank SJ,Kudchadker RJ

更新日期：2015-09-08 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：:Chest wall radiation therapy treatment delivery was monitored using a 5 mm thick radiochromic poly(vinyl alcohol) cryogel that also provided buildup material. The cryogels were used to detect positioning errors and measure the impact of shifts for a chest wall treatment that was delivered to a RANDO phantom. The phant...

journal_title：Journal of applied clinical medical physics

authors： Eyadeh MM,Weston MA,Juhasz J,Diamond KR

更新日期：2016-09-08 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：: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：: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：: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：:Traditional quality assurance checks of a patient's radiation therapy plan involve printing out treatment parameters from the treatment planning system and the "record and verify" (R&V) system and visually checking the information for one-to-one correspondence. In a paperless environment, one can automate this process...

journal_title：Journal of applied clinical medical physics

authors： Siochi RA,Pennington EC,Waldron TJ,Bayouth JE

更新日期：2009-01-27 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：PURPOSE:Elekta XVI 5.0 allows for four-dimensional cone beam computed tomography (4D CBCT) image acquisition during treatment delivery to monitor intrafraction motion. These images can have poorer image quality due to undersampling of kV projections and treatment beam MV scatter effects. We determine if a universal int...

journal_title：Journal of applied clinical medical physics

authors： Liang J,Lack D,Zhou J,Liu Q,Grills I,Yan D

更新日期：2019-12-01 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：:Treatment planning for breast cancer has been traditionally based on clinical landmarks. The Radiation Therapy Oncology Group (RTOG) published consensus guidelines on contouring target volumes (TV) for the breast/chest wall and draining lymphatics. The effect of these guidelines on dosimetric parameters in surrounding...

journal_title：Journal of applied clinical medical physics

authors： Rudra S,Al-Hallaq HA,Feng C,Chmura SJ,Hasan Y

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 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：:The purpose of this study is to evaluate the accuracy of the electron Monte Carlo (eMC) dose calculation algorithm included in a commercial treatment planning system and compare its performance against an electron pencil beam algorithm. Several tests were performed to explore the system's behavior in simple geometries...

journal_title：Journal of applied clinical medical physics

authors： Chamberland E,Beaulieu L,Lachance B

更新日期：2015-05-08 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