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：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：:This work introduces a new technology for electron intensity modulation, which uses small area island blocks within the collimating aperture and small area island apertures in the collimating insert. Due to multiple Coulomb scattering, electrons contribute dose under island blocks and lateral to island apertures. By s...

journal_title：Journal of applied clinical medical physics

authors： Hogstrom KR,Carver RL,Chambers EL,Erhart K

更新日期：2017-11-01 00:00:00

abstract：INTRODUCTION:Designing a radiation plan that optimally delivers both target coverage and normal tissue sparing is challenging. There are limited tools to determine what is dosimetrically achievable and frequently the experience of the planner/physician is relied upon to make these determinations. PlanIQ software provid...

journal_title：Journal of applied clinical medical physics

authors： Fried DV,Chera BS,Das SK

更新日期：2017-09-01 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：:This study utilizes process control techniques to identify action limits for TomoTherapy couch positioning quality assurance tests. A test was introduced to monitor accuracy of the applied couch offset detection in the TomoTherapy Hi-Art treatment system using the TQA "Step-Wedge Helical" module and MVCT detector. Ind...

journal_title：Journal of applied clinical medical physics

authors： Binny D,Lancaster CM,Trapp JV,Crowe SB

更新日期：2017-09-01 00:00:00

abstract：:A patient specific quality assurance (QA) should detect errors that originate anywhere in the treatment planning process. However, the increasing complexity of treatment plans has increased the need for improvements in the accuracy of the patient specific pretreatment verification process. This has led to the utilizat...

journal_title：Journal of applied clinical medical physics

authors： Defoor DL,Stathakis S,Roring JE,Kirby NA,Mavroidis P,Obeidat M,Papanikolaou N

更新日期：2017-07-01 00:00:00

abstract：PURPOSE:The purpose of this study was to optimize intra-voxel incoherent motion (IVIM) measurement in diffusion-weighted imaging (DWI) of breast cancer by separating perfusion and diffusion effects through the determination of an optimal threshold b-value, thus benign and cancerous breast tissues can be accurately diff...

journal_title：Journal of applied clinical medical physics

authors： Chen W,Zhang J,Long D,Wang Z,Zhu JM

更新日期：2017-05-01 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：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 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：:This work describes the use of 3D printing technology to create individualized boluses for patients treated with electron beam therapy for skin lesions of the eye canthi. It aimed to demonstrate the effectiveness of 3D-printed over manually fabricated paraffin boluses. The study involved 11 patients for whom the const...

journal_title：Journal of applied clinical medical physics

authors： Łukowiak M,Jezierska K,Boehlke M,Więcko M,Łukowiak A,Podraza W,Lewocki M,Masojć B,Falco M

更新日期：2017-01-01 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：:Multileaf collimator (MLC) tracking represents a promising technique for motion management in radiotherapy. However, the conflict between limited leaf speed/acceleration and the demand for tracking fast target motion is now a prominent issue. Conventional MLCs typically have a maximum leaf speed of 3-4 cm/s and a maxi...

journal_title：Journal of applied clinical medical physics

authors： Zhang X,Ye P,Zhang H

更新日期：2017-01-01 00:00:00

abstract：:Flattening filter-free (FFF) beams produce higher dose rates. Combined with compensator-based intensity modulated radiotherapy (IMRT) techniques, the dose delivery for each beam can be much shorter compared to the flattened beam MLC-based or flattened beam compensator-based IMRT. This 'snap shot' IMRT delivery is bene...

journal_title：Journal of applied clinical medical physics

authors： Zhang DG,Feygelman V,Moros EG,Latifi K,Hoffe S,Frakes J,Zhang GG

更新日期：2017-01-01 00:00:00

abstract：:The purpose was to study correlations amongst IMRT DVH evaluation points and how their relaxation impacts the overall plan. 100 head-and-neck cancer cases, using the Eclipse treatment planning system with the same protocol, are statisti-cally analyzed for PTV, brainstem, and spinal cord. To measure variations amongst ...

journal_title：Journal of applied clinical medical physics

authors： Roy A,Das IJ,Nohadani O

更新日期：2016-11-08 00:00:00

abstract：:During volume-modulated arc therapies (VMAT), dosimetric errors are introduced by multiple open dynamic leaf gaps that are present in fixed diaphragm linear accelerators. The purpose of this work was to develop a methodology for adjusting the rounded leaf end modeling parameters to improve out-of-field dose agreement ...

journal_title：Journal of applied clinical medical physics

authors： Young LA,Yang F,Cao N,Meyer J

更新日期：2016-11-08 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：: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：:Chest wall radiation therapy treatment delivery was monitored using a 5 mm thick radiochromic poly(vinyl alcohol) cryogel that also provided buildup material. The cryogels were used to detect positioning errors and measure the impact of shifts for a chest wall treatment that was delivered to a RANDO phantom. The phant...

journal_title：Journal of applied clinical medical physics

authors： Eyadeh MM,Weston MA,Juhasz J,Diamond KR

更新日期：2016-09-08 00:00:00

abstract：:The purpose of this study was to develop and validate cardiac computed tomog-raphy (CT) quantitative analysis software with a patient-specific, 17-segment myocardial model that uses electrocardiogram (ECG)-gated cardiac CT images to differentiate between normal controls and severe aortic stenosis (AS) patients. ECG-ga...

journal_title：Journal of applied clinical medical physics

authors： Jung J,Kim YH,Kim N,Yang DH

更新日期：2016-09-08 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：:Detection and accurate quantification of treatment delivery errors is important in radiation therapy. This study aims to evaluate the accuracy of DVH based QA in quantifying delivery errors. Eighteen previously treated VMAT plans (prostate, H&N, and brain) were randomly chosen for this study. Conventional IMRT deliver...

journal_title：Journal of applied clinical medical physics

authors： Ma T,Podgorsak MB,Kumaraswamy LK

更新日期：2016-09-08 00:00:00

abstract：:The Gamma Knife Check software is an FDA approved second check system for dose calculations in Gamma Knife radiosurgery. The purpose of this study was to evaluate the accuracy and the stability of the commercial software package as a tool for independent dose verification. The Gamma Knife Check software version 8.4 wa...

journal_title：Journal of applied clinical medical physics

authors： Xu AY,Bhatnagar J,Bednarz G,Novotny J Jr,Flickinger J,Lunsford LD,Huq MS

更新日期：2016-07-08 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：: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 primary study objective was to assess radiation doses using a modified form of the Imaging Performance Assessment of Computed Tomography (CT) scanner (ImPACT) patient dosimetry for cardiac applications on an Aquilion ONE ViSION Edition scanner, including the Ca score, target computed tomography angiography (CTA), ...

journal_title：Journal of applied clinical medical physics

authors： Kobayashi M,Asada Y,Matsubara K,Suzuki S,Koshida K,Matsunaga Y,Haba T,Kawaguchi A,Toyama H,Kato R

更新日期：2016-07-08 00:00:00

abstract：:The aim of this study was to compare image noise properties of GE Discovery HD 750 and Toshiba Aquilion ONE. The uniformity section of a Catphan 600 image quality assurance phantom was scanned with both scanners, at different dose levels and with extension rings simulating patients of different sizes. 36 datasets were...

journal_title：Journal of applied clinical medical physics

authors： Mozejko D,Andersen HK,Pedersen M,Waaler D,Martinsen AC

更新日期：2016-05-08 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：: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：:Our institution performs in vivo verification measurement for each of our total body irradiation (TBI) patients with optically stimulated luminescent dosimeters (OSLD). The lung block verification measurements were commonly higher than expected. The aim of this work is to understand this discrepancy and improve the ac...

journal_title：Journal of applied clinical medical physics

authors： Narayanasamy G,Cruz W,Saenz DL,Stathakis S,Papanikolaou N,Kirby N

更新日期：2016-05-08 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：: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：:The purpose of this study is to describe the comprehensive commissioning process and initial clinical experience of the Mevion S250 proton therapy system, a gantry-mounted, single-room proton therapy platform clinically implemented in the S. Lee Kling Proton Therapy Center at Barnes-Jewish Hospital in St. Louis, MO, U...

journal_title：Journal of applied clinical medical physics

authors： Zhao T,Sun B,Grantham K,Rankine L,Cai B,Goddu SM,Santanam L,Knutson N,Zhang T,Reilly M,Bottani B,Bradley J,Mutic S,Klein EE

更新日期：2016-03-08 00:00:00

abstract：:The purpose of this study was to implement full/half bowtie filter models in a com-mercial treatment planning system (TPS) to calculate kilovoltage (kV) cone-beam CT (CBCT) doses of Varian On-Board Imager (OBI) kV X-ray imaging system. The full/half bowtie filter models were created as compensators in Pinnacle TPS usi...

journal_title：Journal of applied clinical medical physics

authors： Kim S,Alaei P

更新日期：2016-03-08 00:00:00

abstract：:Performing a procedure on the wrong patient or site is one of the greatest errors that can occur in medicine. The addition of automation has been shown to reduce errors in many processes. In this work we explore the use of an automated patient identification process using optical surface imaging for radiotherapy treat...

journal_title：Journal of applied clinical medical physics

authors： Wiant DB,Verchick Q,Gates P,Vanderstraeten CL,Maurer JM,Hayes TL,Liu H,Sintay BJ

更新日期：2016-03-08 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：: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

abstract：:In Winston-Lutz (WL) tests, the isocenter of a linear accelerator (linac) is determined as the intersection of radiation central axes (CAX) from multiple gantry, collimator, and couch angles. It is well known that the CAX can wobble due to mechanical imperfections of the linac. Previous studies suggested that the wobb...

journal_title：Journal of applied clinical medical physics

authors： Du W,Johnson JL,Jiang W,Kudchadker RJ

更新日期：2016-01-08 00:00:00

abstract：:We clarified the relationship between the display size of MRI images and observer performance using a digital contrast-detail (d-CD) phantom. The d-CD phantom was developed using Microsoft Visual Basic 2010 Express. It had a 512 × 512 matrix in size and a total of 100 holes, whose diameter increased stepwise from 4 to...

journal_title：Journal of applied clinical medical physics

authors： Fujita H,Kuwahata N,Hattori H,Kinoshita H,Fukuda H

更新日期：2016-01-08 00:00:00