A feasibility study of multislice X-ray CT imaging of gel dosimeters using the "zero scan" method.

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：:Varian (Palo Alto, California, United States) recently released an online adaptation treatment platform, Ethos, which has introduced a new Dose Preview and Automated Plan Generation module despite sharing identical beam data with the existing Halcyon linac. The module incorporates a preconfigured beam model and the Ac...

journal_title：Journal of applied clinical medical physics

authors： Hu Y,Byrne M,Archibald-Heeren B,Collett N,Liu G,Aland T

更新日期：2020-12-01 00:00:00

abstract：:Traditional quality assurance checks of a patient's radiation therapy plan involve printing out treatment parameters from the treatment planning system and the "record and verify" (R&V) system and visually checking the information for one-to-one correspondence. In a paperless environment, one can automate this process...

journal_title：Journal of applied clinical medical physics

authors： Siochi RA,Pennington EC,Waldron TJ,Bayouth JE

更新日期：2009-01-27 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：: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：:Optimal choice of beam energy in radiation therapy is easy in many well-documented cases, but less obvious in some others. Low-energy beams may provide better conformity around the target than their high-energy counterparts due to reduced lateral scatter, but they also contribute to overdosage of peripheral normal tis...

journal_title：Journal of applied clinical medical physics

authors： St-Hilaire J,Sévigny C,Beaulieu F,Gingras L,Tremblay D,Beaulieu L

更新日期：2009-09-03 00:00:00

abstract：:Beam quality correction kQQo (r), which reflects the absorbed energy dependence of the detector, is calculated for solid state detector materials diamond, LiF, Li2B4O7 and Al2O3 for the 137Cs RTR brachytherapy source using the Monte Carlo-based EGSnrc code system. The study also includes calculation of detector-specif...

journal_title：Journal of applied clinical medical physics

authors： Selvam TP,Mishra S,Vishwakarma RS

更新日期：2014-01-06 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：: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：:For patients with medically inoperable early-stage non-small cell lung cancer (NSCLC) treated with stereotactic body radiation therapy, early treatment plans were based on a simpler dose calculation algorithm, the pencil beam (PB) calculation. Because these patients had the longest treatment follow-up, identifying dos...

journal_title：Journal of applied clinical medical physics

authors： Liu H,Zhuang T,Stephans K,Videtic G,Raithel S,Djemil T,Xia P

更新日期：2015-11-08 00:00:00

abstract：PURPOSE:To investigate the daily setup, interfraction motion, variability in the junction areas, and dosimetric effect in craniospinal irradiation (CSI) patients. METHODS:Fifteen CSI patients who had undergone split-field IMRT were followed in the study. Previous, middle, and posttreatment, each target volume position...

journal_title：Journal of applied clinical medical physics

authors： Duan X,Zhou Y,Dai H,Zhao L,Qian J,Yang D,Zhang L,Luo C,Li G

更新日期：2020-08-01 00:00:00

abstract：:For most computed tomography (CT) simulators, radiation therapists must remove the flat couch top to perform daily CT quality assurance (QA), and then use separate tools to perform localization-laser QA. This process wastes time and effort and creates the opportunity for accidents to occur. In this study, we tested a ...

journal_title：Journal of applied clinical medical physics

authors： Liu RR,Prado K,Gillin M

更新日期：2009-06-17 00:00:00

abstract：:Shewhart control charts have previously been suggested as a process control tool for use in routine linear accelerator (linac) output verifications. However, a comprehensive approach to process control has not been investigated for linac output verifications. The purpose of this work is to investigate a comprehensive ...

journal_title：Journal of applied clinical medical physics

authors： Sanghangthum T,Suriyapee S,Srisatit S,Pawlicki T

更新日期：2013-01-07 00:00:00

abstract：:We investigate the role of adaptive radiation therapy in pediatric patients with diffuse pontine glioma and the impact of steroid-related weight gain on treatment parameters utilizing cone-beam CT. Fifteen patients with diffuse pontine glioma were treated with three-dimensional conformal radiation therapy and enrolled...

journal_title：Journal of applied clinical medical physics

authors： Beltran C,Sharma S,Merchant TE

更新日期：2011-01-30 00:00:00

abstract：:A low-energy (50 kV) X-ray tube used for the stereotactic irradiation of intracranial lesions has been in use since 1999. The unit is calibrated prior to every procedure and during periodic quality assurance (QA) tests. The unit uses an internal and an external scintillation detector to monitor dose as well as a conve...

journal_title：Journal of applied clinical medical physics

authors： Biggs PJ

更新日期：2006-08-24 00:00:00

abstract：PURPOSE:The goal of this study was to find the optimal combination of collimator, photopeak and scatter correction for 177 Lutetium (177 Lu) SPECT/CT imaging. METHODS:Three experiments [sphere-to-background ratios (SBR) 50:1, 10:1, and 2:1] were performed with the NEMA Image Quality phantom filled with 177 Lu-trichlor...

journal_title：Journal of applied clinical medical physics

authors： Huizing DMV,Sinaasappel M,Dekker MC,Stokkel MPM,de Wit-van der Veen BJ

更新日期：2020-09-01 00:00:00

abstract：:Radiochromic film has become an important tool to verify dose distributions in highly conformal radiation therapy such as IMRT. Recently, a new generation of these films, EBT3, has become available. EBT3 has the same composition and thickness of the sensitive layer of the previous EBT2 films, but its symmetric layer c...

journal_title：Journal of applied clinical medical physics

authors： Casanova Borca V,Pasquino M,Russo G,Grosso P,Cante D,Sciacero P,Girelli G,La Porta MR,Tofani S

更新日期：2013-03-04 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：PURPOSE:To establish a streamlined end-to-end test of a 6 degrees-of-freedom (6DoF) robotic table using a 3D printed phantom for periodic quality assurance. METHODS:A 3D printed phantom was fabricated with translational and rotational offsets and an imbedded central ball-bearing (BB). The phantom underwent each step o...

journal_title：Journal of applied clinical medical physics

authors： Woods K,Ayan AS,Woollard J,Gupta N

更新日期：2018-01-01 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：PURPOSE:Beam matching occurs on all linacs to some degree and when two are more are matched to each other, patients are able to be transferred between machines. Quality assurance of plans can also be performed "distributively" on any of the matched linacs. The degree to which machines are matched and how this translate...

journal_title：Journal of applied clinical medical physics

authors： Rijken J,Schachenmayr H,Crowe S,Kairn T,Trapp J

更新日期：2019-04-01 00:00:00

abstract：INTRODUCTION:The purpose of this study was to present the optimization process of CT parameters to reduce patient exposure during bone SPECT/CT without affecting the quality of SPECT images with attenuation correction (AC). MATERIAL AND METHODS:A fillable phantom reflecting realistic bone scintigraphy conditions was d...

journal_title：Journal of applied clinical medical physics

authors： Tulik M,Tulik P,Kowalska T

更新日期：2020-10-27 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：:Four-dimensional computerized tomography (4DCT) is required for stereotactic ablative body radiotherapy (SABR) of mobile targets to account for tumor motion during treatment planning and delivery. In this study, we report on the impact of an image review quality assurance process performed prior to treatment planning ...

journal_title：Journal of applied clinical medical physics

authors： Antony R,Lonski P,Ungureanu E,Hardcastle N,Yeo A,Siva S,Kron T

更新日期：2020-03-01 00:00:00

abstract：:We describe a method for independently verifying the dose distributions from pre- and post-implant brachytherapy source distributions. Monte Carlo calculations have been performed to characterize the three-dimensional dose distribution in water phantom from a low-energy brachytherapy source. The calculations are perfo...

journal_title：Journal of applied clinical medical physics

authors： DeMarco JJ,Solberg TD,Agazaryan N

更新日期：2003-01-01 00:00:00

abstract：:A thermobrachytherapy surface applicator (TBSA) was developed for simultaneous heat and brachytherapy treatment of chest wall (CW) recurrence of breast cancer. The ability to comfortably secure the applicator over the upper torso relative to the CW target throughout treatment is assessed on volunteers. Male and postma...

journal_title：Journal of applied clinical medical physics

authors： Arunachalam K,Craciunescu OI,Markewitz EJ,Maccarini PF,Schlorff JL,Stauffer PR

更新日期：2012-09-06 00:00:00

abstract：PURPOSE:Elekta XVI 5.0 allows for four-dimensional cone beam computed tomography (4D CBCT) image acquisition during treatment delivery to monitor intrafraction motion. These images can have poorer image quality due to undersampling of kV projections and treatment beam MV scatter effects. We determine if a universal int...

journal_title：Journal of applied clinical medical physics

authors： Liang J,Lack D,Zhou J,Liu Q,Grills I,Yan D

更新日期：2019-12-01 00:00:00

abstract：:A quality assurance (QA) procedure was developed to evaluate the congruence between the cone-beam computed tomography (CBCT) image center and the radiation isocenter on a Varian Trilogy linac. In contrast to the published QA procedures, this method did not require a ball bearing (BB) phantom to be placed exactly at th...

journal_title：Journal of applied clinical medical physics

authors： Du W,Yang JN,Chang EL,Luo D,McAleer MF,Shiu A,Martel MK

更新日期：2010-07-02 00:00:00

abstract：:Remote afterloading devices used for high-dose-rate (HDR) brachytherapy may be supplied with different sources, and these sources typically have differing initial source strengths. In addition, the proposed frequency for source changes may also vary, depending upon the source type. Dosimetric parameters unique to each...

journal_title：Journal of applied clinical medical physics

authors： Davis SD,Parker W,Evans MD

更新日期：2013-11-04 00:00:00

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