Monte Carlo investigation of collapsed versus rotated IMRT plan verification.

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：:Dental amalgams are a common source of artifacts in head and neck (HN) images. Commercial artifact reduction techniques have been offered, but are substantially ineffectual at reducing artifacts from dental amalgams, can produce additional artifacts, provide inaccurate HU information, or require extensive computation ...

journal_title：Journal of applied clinical medical physics

authors： Branco D,Kry S,Taylor P,Rong J,Zhang X,Peterson C,Frank S,Followill D

更新日期：2020-08-01 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：: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:The target detectability of cone beam computed tomography (CBCT) performed in image-guided radiation therapy (IGRT) was investigated to achieve sufficient image quality for patient positioning over a course of treatment session while maintaining radiation exposure from CBCT imaging as low as reasonably achievab...

journal_title：Journal of applied clinical medical physics

authors： Yang CC,Yu PC,Ruan JM,Chen YC

更新日期：2018-05-01 00:00:00

abstract：:Monte Carlo simulations are widely used for calculation of the dosimetric parameters of brachytherapy sources. MCNP4C2, MCNP5, MCNPX, EGS4, EGSnrc, PTRAN, and GEANT4 are among the most commonly used codes in this field. Each of these codes utilizes a cross-sectional library for the purpose of simulating different elem...

journal_title：Journal of applied clinical medical physics

authors： Zaker N,Zehtabian M,Sina S,Koontz C,Meigooni AS

更新日期：2016-03-08 00:00:00

abstract：:Stereotactic body radiotherapy (SBRT) of lung tumors via the ring-mounted Halcyon Linac, a fast kilovoltage cone beam CT-guided treatment with coplanar geometry, a single energy 6MV flattening filter free (FFF) beam and volumetric modulated arc therapy (VMAT) is a fast, safe, and feasible treatment modality for select...

journal_title：Journal of applied clinical medical physics

authors： Pokhrel D,Visak J,Critchfield LC,Stephen J,Bernard ME,Randall M,Kudrimoti M

更新日期：2020-12-20 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：PURPOSE:To evaluate the quality of patient-specific complicated treatment plans, including commercialized treatment planning systems (TPS) and commissioned beam data, we developed a process of quality assurance (QA) using a Monte Carlo (MC) platform. Specifically, we constructed an interface system that automatically c...

journal_title：Journal of applied clinical medical physics

authors： Lee B,Jeong S,Chung K,Yoon M,Park HC,Han Y,Jung SH

更新日期：2019-10-01 00:00:00

abstract：PURPOSE/OBJECTIVES:To present our linac-based SRS procedural technique for medically and/or surgically refractory trigeminal neuralgia (TN) treatment and simultaneously report our clinical outcomes. MATERIALS AND METHODS:Twenty-seven refractory TN patients who were treated with a single fraction of 80 Gy to TN. Treatm...

journal_title：Journal of applied clinical medical physics

authors： Pokhrel D,Sood S,McClinton C,Saleh H,Badkul R,Jiang H,Stepp T,Camarata P,Wang F

更新日期：2017-03-01 00:00:00

abstract：:Hypofractionated treatments generally increase the complexity of a treatment plan due to the more stringent constraints of normal tissues and target coverage. As a result, treatment plans contain more modulated MLC motions that may require extra efforts for accurate dose calculation. This study explores methods to min...

journal_title：Journal of applied clinical medical physics

authors： Yang J,Tang G,Zhang P,Hunt M,Lim SB,LoSasso T,Mageras G

更新日期：2016-03-08 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：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

abstract：:The goal of the present study was to develop a new dose-volume histogram (DVH)- based homogeneity index for effectively evaluating the dose homogeneity of intensity-modulated radiotherapy plans. The new index, called the sigma-index ("S-index") is defined as the standard deviation of the normalized differential DVH cu...

journal_title：Journal of applied clinical medical physics

authors： Yoon M,Park SY,Shin D,Lee SB,Pyo HR,Kim DY,Cho KH

更新日期：2007-03-20 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：PURPOSE:The aim of this study was to develop and assess the performance of supervised machine learning technique to classify magnetic resonance imaging (MRI) voxels as cancerous or noncancerous using noncontrast multiparametric MRI (mp-MRI), comprised of T2-weighted imaging (T2WI), diffusion-weighted imaging (DWI), and...

journal_title：Journal of applied clinical medical physics

authors： Gholizadeh N,Simpson J,Ramadan S,Denham J,Lau P,Siddique S,Dowling J,Welsh J,Chalup S,Greer PB

更新日期：2020-10-01 00:00:00

abstract：:Flattening filter-free (FFF) beams are becoming the preferred beam type for stereotactic radiosurgery (SRS) and stereotactic ablative radiation therapy (SABR), as they enable an increase in dose rate and a decrease in treatment time. This work assesses the effects of the flattening filter on small field output factors...

journal_title：Journal of applied clinical medical physics

authors： Tyler MK,Liu PZ,Lee C,McKenzie DR,Suchowerska N

更新日期：2016-05-08 00:00:00

abstract：:The purpose was to assess the variability in automated translational head/neck setup corrections computed from several different imaging modalities and rigid registration methods using patient anatomy. Shifts were calculated using three commercial and one in-house automated rigid registration methods for nine head/nec...

journal_title：Journal of applied clinical medical physics

authors： Dogan N,Song S,Saleh H,Wu J,Murphy MJ

更新日期：2010-10-13 00:00:00

abstract：PURPOSE:To assess the impact of isocenter shifts due to linac gantry and table rotation during cranial stereotactic radiosurgery on D98 , target volume coverage (TVC), conformity (CI), and gradient index (GI). METHODS:Winston-Lutz (WL) checks were performed on two Elekta Synergy linacs. A stereotactic quality assuranc...

journal_title：Journal of applied clinical medical physics

authors： Wack LJ,Exner F,Wegener S,Sauer OA

更新日期：2020-05-01 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：:While a few physicists have designed new plan check automation solutions for their clinics, fewer, if any, managed to adapt existing solutions. As complex and varied as the systems they check, these programs must gain the full confidence of those who would run them on countless patient plans. The present automation ef...

journal_title：Journal of applied clinical medical physics

authors： Halabi T,Lu HM

更新日期：2014-07-08 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

abstract：:The image-guided radiotherapy technique (IGRT) makes use of imaging devices to verify the positions of the target volume and organs at risk during the treatment sessions. In this work we evaluate the image quality provided by an imaging system based on a kilovoltage cone-beam CT, and explore its ability to perform IGR...

journal_title：Journal of applied clinical medical physics

authors： Garayoa J,Castro P

更新日期：2013-01-07 00:00:00

abstract：:To monitor delivered dose and trigger plan adaptation when deviation becomes unacceptable, a clinical treatment dose (Tx-Dose) reconstruction system based on three-dimensional (3D)/four-dimensional (4D)-cone beam computed tomograpy (CBCT) images was developed and evaluated on various treatment sites, particularly for ...

journal_title：Journal of applied clinical medical physics

authors： Qin A,Gersten D,Liang J,Liu Q,Grill I,Guerrero T,Stevens C,Yan D

更新日期：2018-11-01 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：:It is important to improve the magnitude of dose variation that is caused by the interplay effect. The aim of this study was to investigate the impact of the number of breaths (NBs) to the dose variation for VMAT-SBRT to lung cancer. Data on respiratory motion and multileaf collimator (MLC) sequence were collected fro...

journal_title：Journal of applied clinical medical physics

authors： Kubo K,Monzen H,Tamura M,Hirata M,Ishii K,Okada W,Nakahara R,Kishimoto S,Kawamorita R,Nishimura Y

更新日期：2018-03-01 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：:Routine constancy checks of electron energy are often time consuming because of the necessity to measure a dose at two depths. A technique is described that uses a double-wedge shaped phantom positioned on a Profiler diode array for measuring an electron energy constancy metric similar to R(50). The double-wedge elect...

journal_title：Journal of applied clinical medical physics

authors： Wells DM,Picco PJ,Ansbacher W

更新日期：2003-07-01 00:00:00

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：:This article compares two algorithms for determining beam weights and wedge filters for conformal treatment planning. One algorithm, which is based on dose-gradient analysis, provides analytic formulas for determining beam weights, wedge angles, and collimator angles (i.e., wedge orientations) so that the dose distrib...

journal_title：Journal of applied clinical medical physics

authors： Dai J,Zhu Y

更新日期：2002-07-01 00:00:00