SU-D-213CD-03: Live Video-Guided Volumetric Tracking of Respiration Motion.

abstract：PURPOSE:Tomosynthesis is a promising modality for breast imaging. The appearance of the tomosynthesis reconstructed image is greatly affected by the choice of acquisition and reconstruction parameters. The purpose of this study was to investigate the limitations of tomosynthesis breast imaging due to scan parameters an...

journal_title：Medical physics

authors： Reiser I,Nishikawa RM

更新日期：2010-04-01 00:00:00

abstract：PURPOSE:The harmonic spectrum of magnetic nanoparticles contains valuable information about the quantity and environment of the particles. Harmonic amplitudes have been used to produce quantitative images and ratios of these amplitudes have been used to monitor changes in the particle environment. Harmonic phase angles...

journal_title：Medical physics

authors： Rauwerdink AM,Weaver JB

更新日期：2010-06-01 00:00:00

abstract：PURPOSE:To quickly and automatically propagate organ contours from pretreatment to fraction images in magnetic resonance (MR)-guided prostate external-beam radiotherapy. METHODS:Five prostate cancer patients underwent 20 fractions of image-guided external-beam radiotherapy on a 1.5 T MR-Linac system. For each patient,...

journal_title：Medical physics

authors： Eppenhof KAJ,Maspero M,Savenije MHF,de Boer JCJ,van der Voort van Zyp JRN,Raaymakers BW,Raaijmakers AJE,Veta M,van den Berg CAT,Pluim JPW

更新日期：2020-03-01 00:00:00

abstract：:The number of intensity modulated radiation therapy (IMRT) procedures is continuously growing worldwide and it is necessary to develop tools for patient specific quality assurance (QA) that avoid using machine time that could be employed in treating additional patients. One way of achieving this goal is to perform a m...

journal_title：Medical physics

authors： Azcona JD,Burguete J

更新日期：2008-01-01 00:00:00

abstract：PURPOSE:Distortions in magnetic resonance imaging (MRI) compromise spatial fidelity, potentially impacting delineation and dose calculation. We characterized 2D and 3D large field of view (FOV), sequence-independent distortion at various positions in a 1.0 T high-field open MR simulator (MR-SIM) to implement correction...

journal_title：Medical physics

authors： Price RG,Kadbi M,Kim J,Balter J,Chetty IJ,Glide-Hurst CK

更新日期：2015-10-01 00:00:00

abstract：PURPOSE:Color images are visualized on medical monitors that are adjusted by a grayscale standard display function (GSDF) or γ2.2. Although the GSDF is visually displayed as a linear graded grayscale, it does not specify how color medical images should be presented. On the other hand, the usual gamma setting for color ...

journal_title：Medical physics

authors： Shibutani T,Onoguchi M,Yoneyama H,Nakajima K,Matsuo S,Bamba Y,Saito S

更新日期：2019-06-01 00:00:00

abstract：PURPOSE:Plastic scintillation detectors are used for dosimetry in small radiation fields with high dose gradients, e.g., provided by β-emitting sources like 106 Ru/106 Rh eye plaques. A drawback is a background signal caused by Cerenkov radiation generated by electrons passing the optical fibers (light guides) of this ...

journal_title：Medical physics

authors： Eichmann M,Thomann B

更新日期：2017-09-01 00:00:00

abstract：:Two experimental methods are described for obtaining average energies of neutron spectra produced by an electron accelerator in a medical treatment room. In the first method, the dose equivalent is measured by means of indium activation foils in an Andersson-Braun moderator. Fluences are determined by the usual activa...

journal_title：Medical physics

authors： LaRiviere PD

更新日期：1985-11-01 00:00:00

abstract：PURPOSE:In CT-guided liver tumor ablation interventions, registration of a preoperative contrast-enhanced CT image to the intraoperative CT image is hypothesized to improve guidance. This is a highly challenging registration task due to differences in patient poses and large deformations, and therefore high registratio...

journal_title：Medical physics

authors： Gunay G,Luu MH,Moelker A,van Walsum T,Klein S

更新日期：2017-07-01 00:00:00

abstract：PURPOSE:Researchers write many computer programs with unique implementations, usually requiring a great amount of effort for other researchers to learn how to install, configure, and use. Some programs require specialized hardware platforms such as GPU workstation or CPU cluster, which may not readily available for man...

journal_title：Medical physics

authors： Folkerts M,Graves Y,Gautier Q,Kim G,Jia X,Jiang S

更新日期：2012-06-01 00:00:00

abstract：PURPOSE:Squamous cell carcinoma (SCC) is commonly treated by electron beam radiotherapy (EBRT) followed by a boost via brachytherapy. Considering the limitations associated with brachytherapy, in this study, a novel boosting technique in EBRT of lip carcinoma using an internal shield as an internal dose enhancer tool (...

journal_title：Medical physics

authors： Shokrani P,Baradaran-Ghahfarokhi M,Zadeh MK

更新日期：2013-04-01 00:00:00

abstract：PURPOSE:To determine the diagnostic efficacy of optical coherence tomography (OCT) to identify cervical intraepithelial neoplasia (CIN) grade 2 or higher by computer-aided diagnosis (CADx). METHODS:OCT has been investigated as a screening/diagnostic tool in the management of preinvasive and early invasive cancers of t...

journal_title：Medical physics

authors： Kang W,Qi X,Tresser NJ,Kareta M,Belinson JL,Rollins AM

更新日期：2011-01-01 00:00:00

abstract：:The determination of the radiation exposure history of the population has become increasingly important in the study of the effects of low-level radiation. The present work was started to try to obtain an in vivo dosimeter that could give an indication of radiation exposure. Dental enamel is the only living tissue whi...

journal_title：Medical physics

authors： Pass B,Aldrich JE

更新日期：1985-05-01 00:00:00

abstract：PURPOSE:To evaluate the replacement of Cerrobend by copper for electron beam cutouts. METHODS:The dosimetric comparisons for circular copper-and Cerrobend-cutouts with diameters (1.0, 2.0, 3.0, 5.0, 7.5, 10.0, and 12.5 cm) were made using electron beams with energies (6, 9, 12, 16, and 20 MeV) from 3 Varian accelerato...

journal_title：Medical physics

authors： Chu A,Feng W,Ahmad M,Chen Z,Nath R

更新日期：2012-06-01 00:00:00

abstract：PURPOSE:To develop a deformable mapping technique to match corresponding lesions between digital breast tomosynthesis (DBT) and automated breast ultrasound (ABUS) images. METHODS:External fiducial markers were attached to the surface of two CIRS multi-modality compressible breast phantoms (A and B) containing multiple...

journal_title：Medical physics

authors： Green CA,Goodsitt MM,Brock KK,Davis CL,Larson ED,Lau JH,Carson PL

更新日期：2018-10-01 00:00:00

abstract：:Angioplasty balloons inflated with a solution of the beta-emitter Re-188 have been used for intravascular brachytherapy to prevent restenosis. Coronary stents are in extensive clinical use for the treatment of de novo atherosclerotic stenoses. In this study, the effect of an interposed stent on the dose distribution h...

journal_title：Medical physics

authors： Wuu CS,Schiff P,Maryanski MJ,Liu T,Borzillary S,Weinberger J

更新日期：2003-02-01 00:00:00

abstract：PURPOSE:To perform a comprehensive and systematic comparison of fixed-beam IMRT and volumetric modulated arc therapy (VMAT) patient-specific QA measurements for a common set of geometries using typical measurement methods. METHODS:Fixed-beam IMRT and VMAT plans were constructed for structure set geometries provided by...

journal_title：Medical physics

authors： Mancuso GM,Fontenot JD,Gibbons JP,Parker BC

更新日期：2012-07-01 00:00:00

abstract：PURPOSE:Experimental dosimetry of high-dose-rate (HDR) 192 Ir brachytherapy (BT) sources is complicated due to high dose and dose-rate gradients, and softening of photon energy spectrum with depth. A single crystal synthetic diamond detector microDiamond (PTW 60019, Freiburg, Germany) has a small active volume, high se...

journal_title：Medical physics

authors： Kaveckyte V,Malusek A,Benmakhlouf H,Alm Carlsson G,Carlsson Tedgren Å

更新日期：2018-01-01 00:00:00

abstract：PURPOSE:Upgrade and benchmarking of a research 4D treatment planning system (4DTPS) suitable for realistic patient treatment planning and treatment simulations taking into account specific requirements for scanned ion beam therapy, i.e., modeling of dose heterogeneities due to interplay effects and range changes caused...

journal_title：Medical physics

authors： Richter D,Schwarzkopf A,Trautmann J,Krämer M,Durante M,Jäkel O,Bert C

更新日期：2013-05-01 00:00:00

abstract：:Depth dose characteristics of 24-MV beams from a medical linear accelerator at various SSDs have been measured. The dose buildup, percent depth dose (PDD), and output were measured using ionization chambers and a diode detector under full scatter. Surface dose ranged from 8% to 51% depending upon the collimator settin...

journal_title：Medical physics

authors： Jani SK,Pennington EC

更新日期：1991-03-01 00:00:00

abstract：:An automated technique has been developed for the verification of treatment field size and shape in external beam radiation therapy. Portal images from film or digital on-line imaging system are analyzed, and basic parameters are derived to describe the field size and shape from the contour points on the field boundar...

journal_title：Medical physics

authors： Leszczynski KW,Shalev S,Gluhchev G

更新日期：1993-05-01 00:00:00

abstract：PURPOSE:To estimate and correct for the volume averaging effect which results from the intra-chamber dose gradients when a Farmer ionization chamber (IC) is used for reference dosimetry in flattening-filter-free (FFF) MV photon beams. METHODS:An intra-chamber dose gradients correction factor (kicdg) to the charge read...

journal_title：Medical physics

authors： Ruggieri R,Naccarato S,Stavrev P,Stavreva N,Pasetto S,Salamone I,Alongi F

更新日期：2016-08-01 00:00:00

abstract：:The fast imaging method named skipped phase encoding and edge deghosting (SPEED) has been demonstrated to reduce scan time considerably with typical magnetic resonance imaging data. In this work, SPEED is simplified with improved efficiency to accelerate the scan of sparse objects; we refer to this method as S-SPEED. ...

journal_title：Medical physics

authors： Chang Z,Xiang QS

更新日期：2007-08-01 00:00:00

abstract：:The nuclear magnetic resonance phenomenon has given rise to both magnetic resonance imaging, which yields morphologic data, and magnetic resonance spectroscopy (MRS), which yields chemical data. In humans these data are derived principally from the resonances of the hydrogen nucleus in the low molecular weight compoun...

journal_title：Medical physics

authors： Prost RW

更新日期：2008-10-01 00:00:00

abstract：PURPOSE:The management of thoracic malignancies with radiation therapy is complicated by continuous target motion. In this study, a real time motion analysis approach is proposed to improve the accuracy of patient setup. METHODS:For 11 lung cancer patients a long training fluoroscopy was acquired before the first trea...

journal_title：Medical physics

authors： Chen T,Jabbour SK,Qin S,Haffty BG,Yue N

更新日期：2013-04-01 00:00:00

abstract：PURPOSE:Dosimetry with ionization chambers in clinical ion beams for radiation therapy requires correction for recombination effects. However, common radiation protocols discriminate between initial and general recombination and provide no universal correction method for the presence of both recombination types in ion ...

journal_title：Medical physics

authors： Christensen JB,Tölli H,Bassler N

更新日期：2016-10-01 00:00:00

abstract：:The analysis and understanding of results of computed tomography (CT) require an understanding of photon attenuation in matter. The high sensitivity and resolution of these devices coupled with the use of a polychromatic photon source require a level and breadth of understanding about photon attenuation not usually re...

journal_title：Medical physics

authors： McCullough EC

更新日期：1975-11-01 00:00:00

abstract：:One of the important features of the Siemens Virtual Wedge (VW) is that the VW factor (VWF) is approximately equal to unity for all beams with a total deviation for a given wedge no greater than 0.05, as specified by Siemens. In this note we report the observed dependence of VWF on dose calibration (cGy/MU), monitor u...

journal_title：Medical physics

authors： Zhu XR,Gillin MT,Ehlers K,Lopez F,Grimm DF,Rownd JJ,Steinberg TH

更新日期：2001-02-01 00:00:00

abstract：PURPOSE:The cone beam computed tomography (CBCT) guided small animal radiation research platform (SARRP) has been developed for focal tumor irradiation, allowing laboratory researchers to test basic biological hypotheses that can modify radiotherapy outcomes in ways that were not feasible previously. CBCT provides exce...

journal_title：Medical physics

authors： Yang Y,Wang KK,Eslami S,Iordachita II,Patterson MS,Wong JW

更新日期：2015-04-01 00:00:00

abstract：:The photon response of silicon-diode neutron detectors is analyzed theoretically and measured in the 15-25-MeV region. The main mechanism for producing a response in the diode is shown to be the displacement of silicon atoms by scattering of electrons. If the photon source is an electron accelerator target, the respon...

journal_title：Medical physics

authors： McCall RC,Jenkins TM,Oliver GD Jr

更新日期：1978-01-01 00:00:00