Generation of wedge-shaped dose distributions through dynamic multileaf collimator dose delivery.

abstract：:Wireless capsule endoscopy (WCE) is an effective technology that can be used to make a gastrointestinal (GI) tract diagnosis of various lesions and abnormalities. Due to a long time required to pass through the GI tract, the resulting WCE data stream contains a large number of frames which leads to a tedious job for c...

journal_title：Journal of applied clinical medical physics

authors： Pogorelov K,Suman S,Azmadi Hussin F,Saeed Malik A,Ostroukhova O,Riegler M,Halvorsen P,Hooi Ho S,Goh KL

更新日期：2019-08-01 00:00:00

abstract：PURPOSE:The objective of this study was to evaluate the impact of the magnetic field regulation in conjunction with the volumetric repainting technique on the spot positions and range in pencil beam scanning proton therapy. METHODS:"Field regulation" - a feature to reduce the switching time between layers by applying ...

journal_title：Journal of applied clinical medical physics

authors： Rana S,Bennouna J,Gutierrez AN,Rosenfeld AB

更新日期：2020-10-15 00:00:00

abstract：:The Vero4DRT (MHI-TM2000) is capable of performing X-ray image-based tracking (X-ray Tracking) that directly tracks the target or fiducial markers under continuous kV X-ray imaging. Previously, we have shown that irregular respiratory patterns increased X-ray Tracking errors. Thus, we assumed that audio instruction, w...

journal_title：Journal of applied clinical medical physics

authors： Nakamura M,Sawada A,Mukumoto N,Takahashi K,Mizowaki T,Kokubo M,Hiraoka M

更新日期：2013-09-06 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：:In this work, the feasibility of using flattening filter free (FFF) beams in volumetric modulated arc therapy (VMAT) total body irradiation (TBI) treatment planning to decrease protracted beam-on times for these treatments was investigated. In addition, a methodology was developed to generate standardized VMAT TBI tre...

journal_title：Journal of applied clinical medical physics

authors： Frederick R,Hudson A,Balogh A,Cao JQ,Pierce G

更新日期：2020-03-01 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 management of a pregnant patient in radiation oncology is an infrequent event requiring careful consideration by both the physician and physicist. The aim of this manuscript was to highlight treatment planning techniques and detail measurements of fetal dose for a pregnant patient recently requiring treatment for ...

journal_title：Journal of applied clinical medical physics

authors： Labby ZE,Barraclough B,Bayliss RA,Besemer AE,Dunkerley DAP,Howard SP

更新日期：2018-09-01 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：: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

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：:In this work, leakage radiation from EA200 series electron applicators on Siemens Primus accelerators is quantified, and its penetration ability in water and/or the shielding material Xenolite-NL established. Initially, measurement of leakage from 10 x 10 - 25 x 25 cm2 applicators was performed as a function of height...

journal_title：Journal of applied clinical medical physics

authors： Yeboah C,Karotki A,Hunt D,Holly R

更新日期：2010-06-15 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 use of a radioactive check device containing Strontium 90 was investigated to carry out the redundancy checks of Farmer-type ionization chambers. It was not possible to meet the recommended tolerance limits of the redundancy checks without taking into account the angular response of the ionization chambers. The io...

journal_title：Journal of applied clinical medical physics

authors： Sidhu NP,Rouvas A,Cadman P

更新日期：2000-10-01 00:00:00

abstract：:Quality control (QC) of CT scanners is important to evaluate image quality and radiation dose. Different QC phantoms for testing image quality parameters on CT are commercially available, and Catphan phantoms are widely used for this purpose. More data from measured image quality parameters on CT are necessary to asse...

journal_title：Journal of applied clinical medical physics

authors： Husby E,Svendsen ED,Andersen HK,Martinsen ACT

更新日期：2017-11-01 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：:The purpose of this investigation is to measure, characterize and report stray photon leakage and scatter radiation measurements from the Mobetron, an intraoperative electron linear accelerator designed for use in an operating room environment. The study is needed due to recent changes to the shielding design of the M...

journal_title：Journal of applied clinical medical physics

authors： Krechetov AS,Goer D,Dikeman K,Daves JL,Mills MD

更新日期：2010-09-07 00:00:00

abstract：:We retrospectively generated IMRT plans for 14 NSCLC patients who had experienced grade 2 or 3 esophagitis (CTCAE version 3.0). We generated 11-beam and reduced esophagus dose plan types to compare changes in the volume and length of esophagus receiving doses of 50, 55, 60, 65, and 70 Gy. Changes in planning target vo...

journal_title：Journal of applied clinical medical physics

authors： Niedzielski J,Bluett JB,Williamson RT,Liao Z,Gomez DR,Court LE

更新日期：2013-07-08 00:00:00

abstract：:We have developed a method to improve the setup accuracy of a Varian Clinac 6/100 couch for delivering conformal arc therapy using a tertiary micro multileaf collimator (MLC) system. Several immobilization devices have been developed to improve the mechanical stability and isocenter alignment of the couch: turn-knob h...

journal_title：Journal of applied clinical medical physics

authors： Li K,Yu CX,Ma L

更新日期：2004-07-01 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：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:Segmentation of liver organ and tumors from computed tomography (CT) scans is an important task for hepatic surgical planning. Manual segmentation of liver and tumors is tedious, time-consuming, and biased to the clinician experience. Therefore, automatic segmentation of liver and tumors is highly desirable. It...

journal_title：Journal of applied clinical medical physics

authors： Alirr OI

更新日期：2020-10-01 00:00:00

abstract：:Continuous arterial spin labeling (CASL) is a technique for performing quantitative perfusion measurements without the need for exogenous contrast agent administration. This technique has seen limited use in the clinic due to problems of poor sensitivity and the potential for artifacts. In addition, CASL requires the ...

journal_title：Journal of applied clinical medical physics

authors： Steger TR,Jackson EF

更新日期：2005-01-01 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：PURPOSE:Adaptive radiotherapy (ART) has potential to reduce toxicity and facilitate safe dose escalation. Dose calculations with the planning CT deformed to cone beam CT (CBCT) have shown promise for estimating the "dose of the day". The purpose of this study is to investigate the "dose of the day" calculation accuracy...

journal_title：Journal of applied clinical medical physics

authors： Yuan Z,Rong Y,Benedict SH,Daly ME,Qiu J,Yamamoto T

更新日期：2020-01-01 00:00:00

abstract：:Monte Carlo (MC)-based dose calculations are generally superior to analytical dose calculations (ADC) in modeling the dose distribution for proton pencil beam scanning (PBS) treatments. The purpose of this paper is to present a methodology for commissioning and validating an accurate MC code for PBS utilizing a parame...

journal_title：Journal of applied clinical medical physics

authors： Huang S,Kang M,Souris K,Ainsley C,Solberg TD,McDonough JE,Simone CB 2nd,Lin L

更新日期：2018-09-01 00:00:00

abstract：:We assessed interfraction positional variation in pancreatic tumors using daily breath-hold cone-beam computed tomography at end-exhalation (EE) with visual feedback (BH-CBCT). Eleven consecutive patients with pancreatic cancer who underwent BH intensity-modulated radiation therapy with visual feedback were enrolled. ...

journal_title：Journal of applied clinical medical physics

authors： Nakamura M,Akimoto M,Ono T,Nakamura A,Yano S,Nakata M,Itasaka S,Mizowaki T,Shibuya K,Hiraoka M

更新日期：2015-03-08 00:00:00

abstract：:In this project, we investigated the use of an electronic portal imaging device (EPID), together with the treatment planning system (TPS) and MLC log files, to determine the delivered doses to the patient and evaluate the agreement between the treatment plan and the delivered dose distribution. The QA analysis results...

journal_title：Journal of applied clinical medical physics

authors： Defoor DL,Vazquez-Quino LA,Mavroidis P,Papanikolaou N,Stathakis S

更新日期：2015-05-08 00:00:00

abstract：PURPOSE:To report our early experiences with failure mode and effects analysis (FMEA) in a community practice setting. METHODS:The FMEA facilitator received extensive training at the AAPM Summer School. Early efforts focused on department education and emphasized the need for process evaluation in the context of high ...

journal_title：Journal of applied clinical medical physics

authors： Schuller BW,Burns A,Ceilley EA,King A,LeTourneau J,Markovic A,Sterkel L,Taplin B,Wanner J,Albert JM

更新日期：2017-11-01 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：:The purpose of the present study was to compare the impact of pulmonary function, body habitus, and stereotactic body radiation therapy (SBRT) immobilization on setup and reproducibility for upper lung tumor. From 2008 through 2011, our institution's prospective SBRT database was searched for patients with upper lung ...

journal_title：Journal of applied clinical medical physics

authors： Sio TT,Jensen AR,Miller RC,Fong de los Santos LE,Hallemeier CL,Foster NR,Park SS,Bauer HJ,Chang K,Garces YI,Olivier KR

更新日期：2014-09-08 00:00:00