Clinical validation of ring-mounted halcyon linac for lung SBRT: comparison to SBRT-dedicated C-arm linac treatments.

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：:Relative dose measurements with small ionization chambers in combination with an electrometer placed in the treatment room ("internal electrometer") show a large dependence on the polarity used. While this was observed previously for percent depth dose curves (PDDs), the effect has not been understood or preventable. ...

journal_title：Journal of applied clinical medical physics

authors： Wegener S,Sauer OA

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：:Independent treatment planning system (TPS) check with Mobius3D software, log files based quality assurance (QA) with MobiusFX, and phantom measurement-based QA with ArcCHECK were performed and cross verified for head-and-neck (17 patients), chest (16 patients), and abdominal (19 patients) cancer patients who underwen...

journal_title：Journal of applied clinical medical physics

authors： Han C,Yi J,Zhu K,Zhou Y,Ai Y,Zheng X,Xie C,Jin X

更新日期：2020-10-01 00:00:00

abstract：PURPOSE:The weighted CT dose index (CTDIw ) has been extended for a nominal total collimation width (nT) greater than 40 mm and relies on measurements of CTDIfreeair. The purpose of this work was to compare three methods of measuring CTDIfreeair and subsequent calculations of CTDIw to investigate their clinical appropr...

journal_title：Journal of applied clinical medical physics

authors： Bujila R,Kull L,Danielsson M,Andersson J

更新日期：2018-07-01 00:00:00

abstract：:The aim of this study was to assess the performance of a gantry-mounted detector system and a couch set detector system using a systematic multileaf collimator positional error manually introduced for volumetric-modulated arc therapy. Four head and neck and esophagus VMAT plans were evaluated by measurement using an e...

journal_title：Journal of applied clinical medical physics

authors： Manikandan A,Sarkar B,Nandy M,Sureka CS,Gossman MS,Sujatha N,Rajendran VT

更新日期：2014-05-08 00:00:00

abstract：:Precise radiation therapy (RT) for abdominal lesions is complicated by respiratory motion and suboptimal soft tissue contrast in 4D CT. 4D MRI offers improved con-trast although long scan times and irregular breathing patterns can be limiting. To address this, visual biofeedback (VBF) was introduced into 4D MRI. Ten v...

journal_title：Journal of applied clinical medical physics

authors： To DT,Kim JP,Price RG,Chetty IJ,Glide-Hurst CK

更新日期：2016-05-08 00:00:00

abstract：PURPOSE:To provide insight into the types of questions asked to medical physicists by patients during one-on-one physicist-patient consults at one institution. MATERIALS AND METHODS:Medical physicists trained in patient communication techniques met with patients to provide an overview of the treatment planning and del...

journal_title：Journal of applied clinical medical physics

authors： Atwood TF,Brown DW,Juang T,Moore KL,McConnell KA,Steers JM,Murphy JD,Mundt AJ,Pawlicki T

更新日期：2020-08-01 00:00:00

abstract：:The primary study objective was to assess radiation doses using a modified form of the Imaging Performance Assessment of Computed Tomography (CT) scanner (ImPACT) patient dosimetry for cardiac applications on an Aquilion ONE ViSION Edition scanner, including the Ca score, target computed tomography angiography (CTA), ...

journal_title：Journal of applied clinical medical physics

authors： Kobayashi M,Asada Y,Matsubara K,Suzuki S,Koshida K,Matsunaga Y,Haba T,Kawaguchi A,Toyama H,Kato R

更新日期：2016-07-08 00:00:00

abstract：:The purpose of this study was to compare dosimetric parameters of treatment plans among four techniques for preoperative single-fraction partial breast radiotherapy in order to select an optimal treatment technique. The techniques evaluated were noncoplanar 3D conformal radiation therapy (3D CRT), noncoplanar intensit...

journal_title：Journal of applied clinical medical physics

authors： Yoo S,Blitzblau R,Yin FF,Horton JK

更新日期：2015-01-08 00:00:00

abstract：:Performing a procedure on the wrong patient or site is one of the greatest errors that can occur in medicine. The addition of automation has been shown to reduce errors in many processes. In this work we explore the use of an automated patient identification process using optical surface imaging for radiotherapy treat...

journal_title：Journal of applied clinical medical physics

authors： Wiant DB,Verchick Q,Gates P,Vanderstraeten CL,Maurer JM,Hayes TL,Liu H,Sintay BJ

更新日期：2016-03-08 00:00:00

abstract：:Magnetic Resonance Imaging (MRI) is increasingly being used for improving tumor delineation and tumor tracking in the presence of respiratory motion. The purpose of this work is to design and build an MR compatible motion platform and to use it for evaluating the geometric accuracy of MR imaging techniques during resp...

journal_title：Journal of applied clinical medical physics

authors： Torfeh T,Hammoud R,El Kaissi T,McGarry M,Aouadi S,Fayad H,Al-Hammadi N

更新日期：2018-03-01 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：:High dose rate (HDR) brachytherapy often involves optimization routines to calculate the dwell times and positions of a radioactive source along specified applicator paths. These routines optimize the dwells in such a way as to deliver the prescribed dose at one or more points while satisfying various constraints. The...

journal_title：Journal of applied clinical medical physics

authors： Lachaine ME,Gorman JC,Palisca MG

更新日期：2003-04-01 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：PURPOSE:To establish a streamlined end-to-end test of a 6 degrees-of-freedom (6DoF) robotic table using a 3D printed phantom for periodic quality assurance. METHODS:A 3D printed phantom was fabricated with translational and rotational offsets and an imbedded central ball-bearing (BB). The phantom underwent each step o...

journal_title：Journal of applied clinical medical physics

authors： Woods K,Ayan AS,Woollard J,Gupta N

更新日期：2018-01-01 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：:A new method of generating wedge-shaped dose distributions through dynamic multileaf collimator dose delivery rather than computer-controlled jaw motion is presented. The method starts with the calculation of a wedge-shaped beam profile for the desired wedge angle. The resultant wedge beam profile is then passed to th...

journal_title：Journal of applied clinical medical physics

authors： Zhu J

更新日期：2005-07-01 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：: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：:Four-dimensional computerized tomography (4DCT) is required for stereotactic ablative body radiotherapy (SABR) of mobile targets to account for tumor motion during treatment planning and delivery. In this study, we report on the impact of an image review quality assurance process performed prior to treatment planning ...

journal_title：Journal of applied clinical medical physics

authors： Antony R,Lonski P,Ungureanu E,Hardcastle N,Yeo A,Siva S,Kron T

更新日期：2020-03-01 00:00:00

abstract：:This study details the generation, verification, and implementation of a treatment planning system (TPS) couch top model for patient support system used in conjunction with a dedicated stereotactic linear accelerator. Couch top model was created within the TPS using CT simulation images of the kVue Calpyso-compatible ...

journal_title：Journal of applied clinical medical physics

authors： Gardner SJ,Gulam M,Song K,Li H,Huang Y,Zhao B,Qin Y,Snyder K,Kim J,Gordon J,Chetty IJ,Wen N

更新日期：2015-07-08 00:00:00

abstract：:Studies have shown that source dwells within Varian's HDR CT/MR compatible ring applicators can deviate from intended positions by several millimeters. Quantifying this offset is an important part of commissioning. The aims of this study were to: 1) determine the reproducibility of the offset, 2) study the interobserv...

journal_title：Journal of applied clinical medical physics

authors： McMahon R,Zhuang T,Steffey BA,Song H,Craciunescu OI

更新日期：2011-11-15 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：:A custom-made computer program, SWIMRT, to construct "multileaf collimator (MLC) machine" file for intensity-modulated radiotherapy (IMRT) fluence maps was developed using MATLAB and the sliding window algorithm. The user can either import a fluence map with a graphical file format created by an external treatment-pla...

journal_title：Journal of applied clinical medical physics

authors： Chow JC,Grigorov GN,Yazdani N

更新日期：2006-05-25 00:00:00

abstract：:We have developed a treatment planning protocol for intensity-modulated radiation therapy of the prostate using commercially available inverse planning software. Treatment plans were developed for ten patients using the Corvus version 3.8 planning system, testing various prescription options, including tissue types, d...

journal_title：Journal of applied clinical medical physics

authors： Ezzell GA,Schild SE,Wong WW

更新日期：2001-04-01 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：: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：:The impact of the treatment couch on a radiotherapy plan is rarely fully assessed during the treatment planning process. Incorporating a couch model into the treatment planning system (TPS) enables the planner to avoid or dosimetrically evaluate beam-couch intersections. In this work, we demonstrate how existing TPS t...

journal_title：Journal of applied clinical medical physics

authors： Van Prooijen M,Kanesalingam T,Islam MK,Heaton RK

更新日期：2010-04-19 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