On the complexity of helical tomotherapy treatment plans.

abstract：:We examined the dose distributions generated by Pinnacle3 (Philips Radiation Oncology Systems, Milpitas, CA) for intensity-modulated radiotherapy (IMRT) plans using a cubic-block-piled compensator as the intensity modulator for 4-MV and 10-MV photon beams. The Pinnacle treatment planning system (TPS) uses an algorithm...

journal_title：Journal of applied clinical medical physics

authors： Sasaki K,Obata Y

更新日期：2006-06-16 00:00:00

abstract：:Our institution performs in vivo verification measurement for each of our total body irradiation (TBI) patients with optically stimulated luminescent dosimeters (OSLD). The lung block verification measurements were commonly higher than expected. The aim of this work is to understand this discrepancy and improve the ac...

journal_title：Journal of applied clinical medical physics

authors： Narayanasamy G,Cruz W,Saenz DL,Stathakis S,Papanikolaou N,Kirby N

更新日期：2016-05-08 00:00:00

abstract：OBJECT:The purpose of this study was to compare two methods of stereotactic localization in Gamma Knife treatment planning: cone beam computed tomography (CBCT) or fiducial. While the fiducial method is the traditional method of localization, CBCT is now available for use with the Gamma Knife Icon. This study seeks to ...

journal_title：Journal of applied clinical medical physics

authors： Duggar WN,Morris B,Fatemi A,Bonds J,He R,Kanakamedala M,Rey-Dios R,Vijayakumar S,Yang C

更新日期：2019-11-01 00:00:00

abstract：PURPOSE:Two different respiratory monitoring systems (Varian's Real-Time Position Management (RPM) System and Siemens' ANZAI belt Respiratory Gating System) are compared in the context of respiratory signals and 4D CT images that are accordingly reconstructed. This study aims to evaluate the feasibility of combined use...

journal_title：Journal of applied clinical medical physics

authors： Liu J,Lin T,Fan J,Chen L,Price R,Ma CC

更新日期：2018-09-01 00:00:00

abstract：:The purpose of this study was to determine the reproducibility of patient-specific, intensity-modulated radiation therapy (IMRT) quality assurance (QA) results in a clinical setting. Six clinical patient plans were delivered to a variety of devices and analyses, including 1) radiographic film; 2) ion chamber; 3) 2D di...

journal_title：Journal of applied clinical medical physics

authors： McKenzie EM,Balter PA,Stingo FC,Jones J,Followill DS,Kry SF

更新日期：2014-05-08 00:00:00

abstract：:Breast treatments are becoming increasingly complex as the use of modulated and partial breast therapies becomes more prevalent. These methods are predicated on accurate and precise positioning for treatment. However, the ability to quantify intrafraction motion has been limited by the excessive dose that would result...

journal_title：Journal of applied clinical medical physics

authors： Wiant DB,Wentworth S,Maurer JM,Vanderstraeten CL,Terrell JA,Sintay BJ

更新日期：2014-11-08 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：: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：:The purpose of this study was to perform comprehensive measurements and testing of a Novalis Tx linear accelerator, and to develop technical guidelines for com-missioning from the time of acceptance testing to the first clinical treatment. The Novalis Tx (NTX) linear accelerator is equipped with, among other features,...

journal_title：Journal of applied clinical medical physics

authors： Kim J,Wen N,Jin JY,Walls N,Kim S,Li H,Ren L,Huang Y,Doemer A,Faber K,Kunkel T,Balawi A,Garbarino K,Levin K,Patel S,Ajlouni M,Miller B,Nurushev T,Huntzinger C,Schulz R,Chetty IJ,Movsas B,Ryu S

更新日期：2012-05-10 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：:Magnetic resonance imaging (MRI) is regularly used for stereotactic imaging of Gamma Knife (GK) radiosurgery patients for GK treatment planning. MRI-induced thermal injuries have occurred and been reported for GK patients with attached metallic headframes. Depending on the specific MR imaging and headframe conditions,...

journal_title：Journal of applied clinical medical physics

authors： Bennett MC,Wiant DB,Gersh JA,Dolesh W,Ding X,Best RC,Bourland JD

更新日期：2012-07-05 00:00:00

abstract：INTRODUCTION:Increased modulation and dynamical delivery of external beam radiotherapy (EBRT), such as volumetric modulated arc therapy (VMAT) with dynamic gantry rotation, continuously variable dose rate (CVDR) and field shapes that change during the beam, place greater demands on the performance of linear accelerator...

journal_title：Journal of applied clinical medical physics

authors： van Appeldoorn AA,Kok JGM,Wolthaus JWH

更新日期：2020-10-23 00:00:00

abstract：BACKGROUND:We analyzed the clinical and imaging characteristics of patients with breast ductal carcinoma in situ with microinvasion (DCISM) and breast ductal carcinoma in situ (DCIS). METHODS:We analyzed the records of 40 patients diagnosed with DCISM and 61 patients with DCIS who were hospitalized at Shengjing Hospit...

journal_title：Journal of applied clinical medical physics

authors： Han S,Qiu F,Han Y,Xu Y,Yin J,Xing F,Bian X,He G

更新日期：2020-12-17 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：: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：:The GafChromic XR Type R film is a relatively new product for recording high radiation dose in interventional radiological procedures. Means of measuring the film response were studied in this investigation. Two handheld reflective-type densitometers of different models were compared in the range of 0-8 Gy. They were ...

journal_title：Journal of applied clinical medical physics

authors： Thomas G,Chu RY,Rabe F

更新日期：2003-10-01 00:00:00

abstract：:Optimal choice of beam energy in radiation therapy is easy in many well-documented cases, but less obvious in some others. Low-energy beams may provide better conformity around the target than their high-energy counterparts due to reduced lateral scatter, but they also contribute to overdosage of peripheral normal tis...

journal_title：Journal of applied clinical medical physics

authors： St-Hilaire J,Sévigny C,Beaulieu F,Gingras L,Tremblay D,Beaulieu L

更新日期：2009-09-03 00:00:00

abstract：:This work illustrates a procedure to assess the overall accuracy associated with Gamma Knife treatment planning using plugging. The main role of source plugging or blocking is to create dose falloff in the junction between a target and a critical structure. We report the use of MAGAT gel dosimeter for verification of ...

journal_title：Journal of applied clinical medical physics

authors： Natanasabapathi G,Subbiah V,Kale SS,Rath GK,Senthilkumaran S,Thulkar S,Subramani V,Laviraj MA,Bisht RK,Mahapatra AK

更新日期：2012-11-08 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：:Radiographic film dosimetry provides fast, convenient 2-D dose distributions, but is challenged by the dependence of film response on scatter conditions (i.e., energy dependence). Verification of delivered dose in the surface buildup region is important for intensity modulated radiation therapy (IMRT) when volumes of ...

journal_title：Journal of applied clinical medical physics

authors： Roberson PL,Moran JM,Kulasekere R

更新日期：2008-10-24 00:00:00

abstract：:Physical and dosimetric characteristics of HDMLC were studied for SRS6, 6, and 10 MV X-rays from Novalis Tx. This in-built tertiary collimator consists of 60 pairs (32 × 0.25 cm; 26 × 0.5 cm and 2 × 0.7 cm) of leaves. Properties of HDMLC studied included alignment, readout and radiation field congruence, radiation pen...

journal_title：Journal of applied clinical medical physics

authors： Sharma DS,Dongre PM,Mhatre V,Heigrujam M

更新日期：2011-04-14 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

abstract：:The longitudinal coverage of a LINAC-mounted CBCT scan is limited to the corresponding dimensional limits of its flat panel detector, which is often shorter than the length of the treatment field. These limits become apparent when fields are designed to encompass wide regions, as when providing nodal coverage. Therefo...

journal_title：Journal of applied clinical medical physics

authors： Zheng D,Lu J,Jefferson A,Zhang C,Wu J,Sleeman W,Weiss E,Dogan N,Song S,Williamson J

更新日期：2012-07-05 00:00:00

abstract：:This study aimed to verify the accuracy of half-value layer (HVL) measured using the new copper pipe method with the CT ionization chamber while the X-ray tube is rotating and to compare it with the conventional nonrotating method and Monte Carlo simulation method based on the actual measurement and geometry of the ne...

journal_title：Journal of applied clinical medical physics

authors： Okubo R,Matsubara K,Chusin T,Hibino T,Ito Y

更新日期：2019-12-01 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：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：: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：:This work describes the use of 3D printing technology to create individualized boluses for patients treated with electron beam therapy for skin lesions of the eye canthi. It aimed to demonstrate the effectiveness of 3D-printed over manually fabricated paraffin boluses. The study involved 11 patients for whom the const...

journal_title：Journal of applied clinical medical physics

authors： Łukowiak M,Jezierska K,Boehlke M,Więcko M,Łukowiak A,Podraza W,Lewocki M,Masojć B,Falco M

更新日期：2017-01-01 00:00:00

abstract：:Varian (Palo Alto, California, United States) recently released an online adaptation treatment platform, Ethos, which has introduced a new Dose Preview and Automated Plan Generation module despite sharing identical beam data with the existing Halcyon linac. The module incorporates a preconfigured beam model and the Ac...

journal_title：Journal of applied clinical medical physics

authors： Hu Y,Byrne M,Archibald-Heeren B,Collett N,Liu G,Aland T

更新日期：2020-12-01 00:00:00

abstract：BACKGROUND AND PURPOSE:Along with the increasing demand for high-quality radiotherapy and the growing number of high-precision radiotherapy devices, precise radiotherapy workflow management and accurate time evaluation of the entire radiotherapy process are crucial to providing appropriate, timely treatment for cancer ...

journal_title：Journal of applied clinical medical physics

authors： Guo C,Huang P,Li Y,Dai J

更新日期：2020-09-01 00:00:00