Maximum MLC opening effect in dynamic delivery of IMRT: leaf-positional analysis.

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 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：:Using a plane-parallel advanced Markus ionization chamber and a stack of water-equivalent solid phantom blocks, percentage surface and build-up doses of Elekta 6 MV flattening filter (FF) and flattening-filter-free (FFF) beams were measured as a function of the phantom depth for field sizes ranging from 2 × 2 to 10 × ...

journal_title：Journal of applied clinical medical physics

authors： Imae T,Takenaka S,Watanabe Y,Aoki A,Matsuda K,Sasaki K,Saegusa S,Nawa K,Nakagawa K,Abe O

更新日期：2020-12-01 00:00:00

abstract：INTRODUCTION:This study aimed to investigate the feasibility of generating pseudo dual-energy CT (DECT) from one 120-kVp CT by using convolutional neural network (CNN) to derive additional information for quantitative image analysis through phantom study. METHODS:Dual-energy scans (80/140 kVp) and single-energy scans ...

journal_title：Journal of applied clinical medical physics

authors： Huang WH,Jhan KJ,Yang CC

更新日期：2020-10-14 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：: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：PURPOSE:We introduce a technique that employs a 2D detector in transmission mode (TM) to verify dose maps at a depth of dmax in Solid Water. TM measurements, when taken at a different surface-to-detector distance (SDD), allow for the area at dmax (in which the dose map is calculated) to be adjusted. METHODS:We conside...

journal_title：Journal of applied clinical medical physics

authors： Utitsarn K,Biasi G,Stansook N,Alrowaili ZA,Petasecca M,Carolan M,Perevertaylo VL,Tomé WA,Kron T,Lerch MLF,Rosenfeld AB

更新日期：2019-11-01 00:00:00

abstract：:For patients with medically inoperable early-stage non-small cell lung cancer (NSCLC) treated with stereotactic body radiation therapy, early treatment plans were based on a simpler dose calculation algorithm, the pencil beam (PB) calculation. Because these patients had the longest treatment follow-up, identifying dos...

journal_title：Journal of applied clinical medical physics

authors： Liu H,Zhuang T,Stephans K,Videtic G,Raithel S,Djemil T,Xia P

更新日期：2015-11-08 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：:Radiochromic film has become an important tool to verify dose distributions in highly conformal radiation therapy such as IMRT. Recently, a new generation of these films, EBT3, has become available. EBT3 has the same composition and thickness of the sensitive layer of the previous EBT2 films, but its symmetric layer c...

journal_title：Journal of applied clinical medical physics

authors： Casanova Borca V,Pasquino M,Russo G,Grosso P,Cante D,Sciacero P,Girelli G,La Porta MR,Tofani S

更新日期：2013-03-04 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：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：:The goal of this study was to investigate small field output factors (OFs) for flat-tening filter-free (FFF) beams on a dedicated stereotactic linear accelerator-based system. From this data, the collimator exchange effect was quantified, and detector-specific correction factors were generated. Output factors for 16 j...

journal_title：Journal of applied clinical medical physics

authors： Qin Y,Zhong H,Wen N,Snyder K,Huang Y,Chetty IJ

更新日期：2016-11-08 00:00:00

abstract：:The purpose of this work is to prospectively assess the setup accuracy that can be achieved with a stereotactic body localizer (SBL) in immobilizing patients for stereotactic intensity-modulated radiotherapy (IMRT) for prostate cancer. By quantifying this important factor and target mobility in the SBL, we expect to p...

journal_title：Journal of applied clinical medical physics

authors： Wang L,Jacob R,Chen L,Ma C,Movsas B,Feigenberg S,Konski A

更新日期：2004-04-01 00:00:00

abstract：:To estimate the lung tumor position from multiple anatomical features on four-dimensional computed tomography (4D-CT) data sets using single regression analysis (SRA) and multiple regression analysis (MRA) approach and evaluate an impact of the approach on internal target volume (ITV) for stereotactic body radiotherap...

journal_title：Journal of applied clinical medical physics

authors： Ono T,Nakamura M,Hirose Y,Kitsuda K,Ono Y,Ishigaki T,Hiraoka M

更新日期：2017-09-01 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 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：PURPOSE:To investigate the effect of the marker placement on the correlation relationship between the motions of external markers and the internal target under different breathing patterns for several lung cancer patients. METHOD AND MATERIAL:To monitor and record simultaneous motions of internal target and associated...

journal_title：Journal of applied clinical medical physics

authors： Yan H,Zhu G,Yang J,Lu M,Ajlouni M,Kim JH,Yin FF

更新日期：2008-04-16 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：: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：:In this study, we compared the amount of lung tissue irradiated when respiratory gating was imposed during expiration with the amount of lung tissue irradiated when gating was imposed during inspiration. Our hypothesis was that the amount of lung tissue spared increased as inspiration increased. Computed tomography (C...

journal_title：Journal of applied clinical medical physics

authors： Butler LE,Forster KM,Stevens CW,Bloch C,Liu HH,Tucker SL,Komaki R,Liao Z,Starkschall G

更新日期：2004-01-01 00:00:00

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：: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：:A new version of progressive resolution optimizer (PRO) with an option of air cavity correction has been implemented for RapidArc volumetric-modulated arc therapy (RA). The purpose of this study was to compare the performance of this new PRO with the use of air cavity correction option (PRO10_air) against the one with...

journal_title：Journal of applied clinical medical physics

authors： Kan MW,Leung LH,Yu PK

更新日期：2013-11-04 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：:In radiation therapy, a secondary independent dose verification is an important component of a quality control system. Mobius3D calculates three-dimensional (3D) patient dose using reference beam data and a collapsed cone convolution algorithm and analyzes dose-volume histogram automatically. There are currently no pu...

journal_title：Journal of applied clinical medical physics

authors： Kodama T,Saito Y,Hatanaka S,Hariu M,Shimbo M,Takahashi T

更新日期：2019-05-01 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：: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：:The purpose of the present study was to use a kilovoltage imaging device to measure interfractional and intrafractional setup deviations in patients with head-and-neck or brain cancers receiving intensity-modulated radiotherapy (IMRT) treatment. Before and after IMRT treatment, approximately 3 times weekly, 7 patients...

journal_title：Journal of applied clinical medical physics

authors： Mechalakos JG,Hunt MA,Lee NY,Hong LX,Ling CC,Amols HI

更新日期：2007-09-24 00:00:00

abstract：:The dosimetry of very small electron fields can be challenging due to relative shifts in percent depth-dose curves, including the location of dmax, and lack of lateral electronic equilibrium in an ion chamber when placed in the beam. Conventionally a small parallel plate chamber or film is utilized to perform small fi...

journal_title：Journal of applied clinical medical physics

authors： Amin MN,Heaton R,Norrlinger B,Islam MK

更新日期：2010-10-04 00:00:00