Quality assurance for a six degrees-of-freedom table using a 3D printed phantom.

abstract：PURPOSE:To quantify the effects of combining layer-based repainting and respiratory gating as a strategy to mitigate the dosimetric degradation caused by the interplay effect between a moving target and dynamic spot-scanning proton delivery. METHODS:An analytic routine modeled three-dimensional dose distributions of p...

journal_title：Journal of applied clinical medical physics

authors： Johnson JE,Herman MG,Kruse JJ

更新日期：2019-09-01 00:00:00

abstract：:Doses in Leksell GammaPlan (Elekta, Stockholm, Sweden) are calculated for each shot by summing the contribution from the 201 radiation beams emitted by the Gamma Knife (Elekta), weighted for attenuation in the tissue traversed. The patient's head is modeled based on 24 skull measurements, from which the depth to the c...

journal_title：Journal of applied clinical medical physics

authors： Berndt A,Beck J

更新日期：2007-07-17 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 case of a 50-year-old man affected by a rhabdomiosarcoma metastatic lesion in the left flank Is reported. The patient was addressed to 50.4 Gy radiotherapy with concomitant chemotherapy in order to locally control the lesion. A Tri-60-Co magnetic resonance hybrid radiotherapy unit was used for treatment delivery a...

journal_title：Journal of applied clinical medical physics

authors： Massaccesi M,Cusumano D,Boldrini L,Dinapoli N,Fionda B,Teodoli S,Azario L,Mattiucci GC,Balducci M,Cellini F,Valentini V

更新日期：2019-06-01 00:00:00

abstract：:Hepatic encephalopathy (HE) is normally diagnosed by neuropsychological (NP) tests, which are not very specific and do not reveal the underlying pathology. Magnetic resonance imaging (MRI) and spectroscopy (MRS) of the brain offer alternative and possibly more specific markers for HE. These methods were applied in con...

journal_title：Journal of applied clinical medical physics

authors： Binesh N,Huda A,Thomas MA,Wyckoff N,Bugbee M,Han S,Rasgon N,Davanzo P,Sayre J,Guze B,Martin P,Fawzy F

更新日期：2006-01-01 00:00:00

abstract：:In this study, we compared the amount of lung tissue irradiated when respiratory gating was imposed during expiration with the amount of lung tissue irradiated when gating was imposed during inspiration. Our hypothesis was that the amount of lung tissue spared increased as inspiration increased. Computed tomography (C...

journal_title：Journal of applied clinical medical physics

authors： Butler LE,Forster KM,Stevens CW,Bloch C,Liu HH,Tucker SL,Komaki R,Liao Z,Starkschall G

更新日期：2004-01-01 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：:The purpose of this study was to assess treatment margins in free-breathing irradiation of pancreatic cancer after bone alignment, and evaluate their impact on conformal radiotherapy. Fifteen patients with adenocarcinoma of the head of the pancreas underwent implantation of single fiducial marker. Intrafraction uncert...

journal_title：Journal of applied clinical medical physics

authors： Solla I,Zucca S,Possanzini M,Piras S,Pusceddu C,Porru S,Meleddu G,Farace P

更新日期：2013-07-08 00:00:00

abstract：:The aim of this study was to report a single-institution experience and commissioning data for Elekta VersaHD linear accelerators (LINACs) for photon beams in the Eclipse treatment planning system (TPS). Two VersaHD LINACs equipped with 160-leaf collimators were commissioned. For each energy, the percent-depth-dose (P...

journal_title：Journal of applied clinical medical physics

authors： Zhang Y,Le AH,Tian Z,Iqbal Z,Chiu T,Gu X,Pugachev A,Reynolds R,Park YK,Lin MH,Stojadinovic S

更新日期：2019-10-01 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：:Locally advanced non-small-cell lung cancer (NSCLC) is a common disease with a low overall survival even with aggressive treatments. Standard imaging (CT and PET/CT) provide no information about normal lung function. We therefore, sought to pilot HeMRI in patients with non-small-cell lung cancer before and after defin...

journal_title：Journal of applied clinical medical physics

authors： Allen AM,Albert M,Caglar HB,Zygmanski P,Soto R,Killoran J,Sun Y

更新日期：2011-01-31 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：: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：INTRODUCTION:This study aimed to investigate the feasibility of generating pseudo dual-energy CT (DECT) from one 120-kVp CT by using convolutional neural network (CNN) to derive additional information for quantitative image analysis through phantom study. METHODS:Dual-energy scans (80/140 kVp) and single-energy scans ...

journal_title：Journal of applied clinical medical physics

authors： Huang WH,Jhan KJ,Yang CC

更新日期：2020-10-14 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 increasing popularity of intensity-modulated arc therapy (IMAT) treatments requires specifically designed linac quality assurance (QA) programs. Gantry angle is one of the parameters that has a major effect on the outcome of IMAT treatments since dose reconstruction for patient-specific QA relies on the gantry ang...

journal_title：Journal of applied clinical medical physics

authors： Rowshanfarzad P,Sabet M,O'Connor DJ,McCowan PM,McCurdy BM,Greer PB

更新日期：2012-11-08 00:00:00

abstract：:Magnetic Resonance Imaging (MRI) is increasingly being used for improving tumor delineation and tumor tracking in the presence of respiratory motion. The purpose of this work is to design and build an MR compatible motion platform and to use it for evaluating the geometric accuracy of MR imaging techniques during resp...

journal_title：Journal of applied clinical medical physics

authors： Torfeh T,Hammoud R,El Kaissi T,McGarry M,Aouadi S,Fayad H,Al-Hammadi N

更新日期：2018-03-01 00:00:00

abstract：:A new calculation algorithm has been developed for independently verifying doses calculated by the TomoTherapy Hi.Art treatment planning system (TPS). The algorithm is designed to confirm the dose to a point in a high dose, low dose-gradient region. Patient data used by the algorithm include the radiological depth to ...

journal_title：Journal of applied clinical medical physics

authors： Gibbons JP,Smith K,Cheek D,Rosen I

更新日期：2009-02-05 00:00:00

abstract：PURPOSE:To assess the setup errors in radiation therapy for thoracic tumors patients of different somatotypes, and to seek an individualized mathematical basis for defining the planning target volume (PTV). METHODS:Sixty patients with thoracic tumors were divided into four somatotypes according to their body mass inde...

journal_title：Journal of applied clinical medical physics

authors： Zhao J,Zhang M,Zhai F,Wang H,Li X

更新日期：2018-05-01 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：: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：: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：:A thorax phantom was used to assess radiotherapy dose deviations induced by respiratory motion of the target volume. Both intensity modulated and static, non-modulated treatment plans were planned on CT scans of the phantom. The plans were optimized using various CT reconstructions, to investigate whether they had an ...

journal_title：Journal of applied clinical medical physics

authors： Sande EPS,Acosta Roa AM,Hellebust TP

更新日期：2020-04-01 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：:A patient with a cardiac ventricular assist device (VAD) with computer-controlled driver presented to our department for radiation therapy. The treatment plan was 4500 cGy to the rectum over 25 fractions with 15MV photon beams. All beams avoided the pump and leads. The response to electromagnetic interference (EMI) wa...

journal_title：Journal of applied clinical medical physics

authors： Lasher DE,Wojcicka JB,Malcom R,Shears LL

更新日期：2008-10-29 00:00:00

abstract：:Significant controversy surrounds the 2012 / 2014 decision announced by the Trustees of the American Board of Radiology (ABR) in October of 2007. According to the ABR, only medical physicists who are graduates of a Commission on Accreditation of Medical Physics Education Programs, Inc. (CAMPEP) accredited academic or ...

journal_title：Journal of applied clinical medical physics

authors： Mills MD,Thornewill J,Esterhay RJ

更新日期：2010-04-12 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：: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：:This paper investigates the accuracy of the two available calculation algorithms of the Oncentra MasterPlan three-dimensional treatment planning system (TPS)-- the pencil beam method and collapsed-cone convolution--in modeling the Varian enhanced dynamic wedge (EDW). Measurements were carried out for a dual high energ...

journal_title：Journal of applied clinical medical physics

authors： Pasquino M,Borca VC,Tofani S,Ozzello F

更新日期：2009-04-22 00:00:00

abstract：:The purpose of this study was to develop and evaluate a noninvasive method to assess rotation time in modern commercial computed tomography (CT) systems. The rotation time was measured at a selected nominal rotation time (400 ms) utilizing two types of solid-state detectors: the RTI's CT Dose Profiler (CTDP) and Unfor...

journal_title：Journal of applied clinical medical physics

authors： Fukuda A,Lin PJ,Matsubara K,Miyati T

更新日期：2014-01-06 00:00:00