Clinical and imaging characteristics of breast ductal carcinoma in situ with microinvasion.

abstract：:The nonphysical wedge is a modality that uses computer-controlled jaw motion to generate wedge-shaped dose distributions. There are Varian enhanced dynamic wedges (EDWs) and Siemens virtual wedges (VWs). We recently commissioned dynamic wedges on both Varian and Siemens LINACs. The beam data, acquired with a Wellhofer...

journal_title：Journal of applied clinical medical physics

authors： Shao H,Wu X,Luo C,Crooks A,Bernstein A,Markoe A

更新日期：2004-10-01 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：:Longitudinal partial volume effects (z-axial PVE), which occur when an object partly occupies a slice, degrade image resolution and contrast in computed tomography (CT). Z-axial PVE is unavoidable for subslice objects and reduces their contrast according to their fraction contained within the slice. This effect can be...

journal_title：Journal of applied clinical medical physics

authors： Monnin P,Sfameni N,Gianoli A,Ding S

更新日期：2017-01-01 00:00:00

abstract：:A Histogram Analysis in Radiation Therapy (HART) program was primarily developed to increase the efficiency and accuracy of dose-volume histogram (DVH) analysis of large quantities of patient data in radiation therapy research. The program was written in MATLAB to analyze patient plans exported from the treatment plan...

journal_title：Journal of applied clinical medical physics

authors： Pyakuryal A,Myint WK,Gopalakrishnan M,Jang S,Logemann JA,Mittal BB

更新日期：2010-01-28 00:00:00

abstract：:Precise radiation therapy (RT) for abdominal lesions is complicated by respiratory motion and suboptimal soft tissue contrast in 4D CT. 4D MRI offers improved con-trast although long scan times and irregular breathing patterns can be limiting. To address this, visual biofeedback (VBF) was introduced into 4D MRI. Ten v...

journal_title：Journal of applied clinical medical physics

authors： To DT,Kim JP,Price RG,Chetty IJ,Glide-Hurst CK

更新日期：2016-05-08 00:00:00

abstract：:Independent treatment planning system (TPS) check with Mobius3D software, log files based quality assurance (QA) with MobiusFX, and phantom measurement-based QA with ArcCHECK were performed and cross verified for head-and-neck (17 patients), chest (16 patients), and abdominal (19 patients) cancer patients who underwen...

journal_title：Journal of applied clinical medical physics

authors： Han C,Yi J,Zhu K,Zhou Y,Ai Y,Zheng X,Xie C,Jin X

更新日期：2020-10-01 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：: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：:Increasingly, the advent of multislice CT scanners, volume CT scanners, and total body spiral acquisition modes has led to the use of Multi Planar Reconstruction and 3D datasets. In considering 3D resolution properties of a CT system it is important to note that both the in-plane (x,y) and z-axis (slice thickness) inf...

journal_title：Journal of applied clinical medical physics

authors： Goodenough D,Levy J,Kristinsson S,Fredriksson J,Olafsdottir H,Healy A

更新日期：2016-09-08 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：: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：:A new method of generating wedge-shaped dose distributions through dynamic multileaf collimator dose delivery rather than computer-controlled jaw motion is presented. The method starts with the calculation of a wedge-shaped beam profile for the desired wedge angle. The resultant wedge beam profile is then passed to th...

journal_title：Journal of applied clinical medical physics

authors： Zhu J

更新日期：2005-07-01 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：OBJECTIVE:To evaluate the accuracy of a deep learning-based auto-segmentation mode to that of manual contouring by one medical resident, where both entities tried to mimic the delineation "habits" of the same clinical senior physician. METHODS:This study included 125 cervical cancer patients whose clinical target volu...

journal_title：Journal of applied clinical medical physics

authors： Wang Z,Chang Y,Peng Z,Lv Y,Shi W,Wang F,Pei X,Xu XG

更新日期：2020-12-01 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：PURPOSE:We conducted this dosimetric analysis to evaluate the feasibility of a multi-center stereotactic body radiation therapy (SBRT) trial for renal cell carcinoma (RCC) using different SBRT platforms. MATERIALS/METHODS:The computed tomography (CT) simulation images of 10 patients with unilateral RCC previously trea...

journal_title：Journal of applied clinical medical physics

authors： Baydoun A,Vapiwala N,Ponsky LE,Awan M,Kassaee A,Sutton D,Podder TK,Zhang Y,Dobbins D,Muzic RF Jr,Traughber B,Machtay M,Ellis R

更新日期：2018-03-14 00:00:00

abstract：PURPOSE:Although breast density is considered a strong risk factor of breast cancer, its quantitative assessment is difficult. To investigate a quantitative method of measuring breast density using dual-energy mammographic imaging with central digital breast tomosynthesis in physically uniform and nonuniform phantoms. ...

journal_title：Journal of applied clinical medical physics

authors： Lu KM,Yeh DM,Cao BH,Lin CY,Liang CY,Zhou YB,Tsai CJ

更新日期：2019-06-01 00:00:00

abstract：:Endorectal balloons (ERBs) are routinely used in prostate proton radiation therapy to immobilize the prostate and spare the rectal wall. Rectal gas can distend the rectum and displace the prostate even in the presence of ERBs. The purpose of this work was to quantify the effects an ERB with a passive gas release condu...

journal_title：Journal of applied clinical medical physics

authors： Wootton LS,Kudchadker RJ,Beddar AS,Lee AK

更新日期：2012-09-06 00:00:00

abstract：:The purpose of this study was to evaluate the dose differences introduced by the TMR 10 and the convolution dose calculation algorithms in GammaPlan version 10, as compared to the TMR classic algorithm in the previous versions of GammaPlan. Computed axial tomographic images of a polystyrene phantom and a human head we...

journal_title：Journal of applied clinical medical physics

authors： Xu AY,Bhatnagar J,Bednarz G,Niranjan A,Flickinger J,Lunsford LD,Huq MS

更新日期：2014-09-08 00:00:00

abstract：:We investigate the sensitivity of IMRT commissioning using the TG-119 C-shape phantom and credentialing with the IROC head and neck phantom to treatment planning system commissioning errors. We introduced errors into the various aspects of the commissioning process for a 6X photon energy modeled using the analytical a...

journal_title：Journal of applied clinical medical physics

authors： McVicker D,Yin FF,Adamson JD

更新日期：2016-01-08 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：:The study purpose was to develop and validate a quality assurance test for CT automatic exposure control (AEC) systems based on a set of nested polymethylmethacrylate CTDI phantoms. The test phantom was created by offsetting the 16 cm head phantom within the 32 cm body annulus, thus creating a three part phantom. This...

journal_title：Journal of applied clinical medical physics

authors： Iball GR,Moore AC,Crawford EJ

更新日期：2016-07-08 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 compare dosimetric parameters of treatment plans among four techniques for preoperative single-fraction partial breast radiotherapy in order to select an optimal treatment technique. The techniques evaluated were noncoplanar 3D conformal radiation therapy (3D CRT), noncoplanar intensit...

journal_title：Journal of applied clinical medical physics

authors： Yoo S,Blitzblau R,Yin FF,Horton JK

更新日期：2015-01-08 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：: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：:As proton therapy becomes increasingly popular, so does the need for Monte Carlo simulation studies involving accurate beam line modeling of proton treatment units. In this study, the 24 beam configurations of the Mevion S250 proton therapy system installed recently at our institution were modeled using the TOolkit fo...

journal_title：Journal of applied clinical medical physics

authors： Prusator M,Ahmad S,Chen Y

更新日期：2017-05-01 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：: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：:This paper aims to evaluate the impact of spectral filtration on image quality in a microcomputed tomography (micro-CT) system. A mouse phantom comprising 11rods for modeling lung, muscle, adipose, and bones was scanned with 17 s and 2min, respectively. The current (μA) for each scan was adjusted to achieve identical ...

journal_title：Journal of applied clinical medical physics

authors： Ren L,Ghani MU,Wu D,Zheng B,Chen Y,Yang K,Wu X,Liu H

更新日期：2016-01-08 00:00:00