Quantitative analysis of image quality for acceptance and commissioning of an MRI simulator with a semiautomatic method.

abstract：:This report provides guidelines for a peer review process between two clinical radiation oncology physicists. While the Task Group's work was primarily focused on ensuring timely and productive independent reviews for physicists in solo practice, these guidelines may also be appropriate for physicists in a group setti...

journal_title：Journal of applied clinical medical physics

authors： Halvorsen PH,Das IJ,Fraser M,Freedman DJ,Rice RE 3rd,Ibbott GS,Parsai EI,Robin TT Jr,Thomadsen BR,American Association of Physicists in Medicine.

更新日期：2005-10-01 00:00:00

abstract：PURPOSE:To investigate the differences between internal target volumes (ITVs) contoured on the simulation 4DCT and daily 4DCBCT images for lung cancer patients treated with stereotactic body radiotherapy (SBRT) and determine the dose delivered on 4D planning technique. METHODS:For nine patients, 4DCBCTs were acquired ...

journal_title：Journal of applied clinical medical physics

authors： Dumas M,Laugeman E,Sevak P,Snyder KC,Mao W,Chetty IJ,Ajlouni M,Wen N

更新日期：2020-10-12 00:00:00

abstract：:The purpose of this study was to develop and evaluate filmless quality assurance (QA) tools for helical tomotherapy by using the signals from the on-board megavoltage computed tomography (MVCT) detector and applying a dedicated step-wedge phantom. The step-wedge phantom is a 15 cm long step-like aluminum block positio...

journal_title：Journal of applied clinical medical physics

authors： Althof V,van Haaren P,Westendorp R,Nuver T,Kramer D,Ikink M,Bel A,Minken A

更新日期：2012-01-05 00:00:00

abstract：PURPOSE:To determine the optimal dose-volume constraint for laryngeal sparing using three commonly employed intensity modulated radiation therapy (IMRT) approaches in patients with oropharyngeal cancer treated to the bilateral neck. MATERIALS AND METHODS:Thirty patients with stage II-IVA oropharynx cancers received de...

journal_title：Journal of applied clinical medical physics

authors： Wilke C,Takiar V,Wang H,Moreno AC,Tung SS,Quinlan-Davidson SR,Garden AS,Rosenthal DI,Fuller CD,Gunn GB,Reddy JP,Morrison WH,Wang C,Zhao G,Hutcheson KA,Phan J

更新日期：2020-12-05 00:00:00

abstract：:The purpose of this study was to investigate amplitude gating combined with a coached breathing strategy for 10 MV flattening filter-free (FFF) volumetric-modulated arc therapy (VMAT) on the Varian TrueBeam linac. Ten patient plans for VMAT SABR liver were created using the Eclipse treatment planning system (TPS). The...

journal_title：Journal of applied clinical medical physics

authors： Viel F,Lee R,Gete E,Duzenli C

更新日期：2015-07-08 00:00:00

abstract：PURPOSE:To provide insight into the types of questions asked to medical physicists by patients during one-on-one physicist-patient consults at one institution. MATERIALS AND METHODS:Medical physicists trained in patient communication techniques met with patients to provide an overview of the treatment planning and del...

journal_title：Journal of applied clinical medical physics

authors： Atwood TF,Brown DW,Juang T,Moore KL,McConnell KA,Steers JM,Murphy JD,Mundt AJ,Pawlicki T

更新日期：2020-08-01 00:00:00

abstract：:Wireless capsule endoscopy (WCE) is an effective technology that can be used to make a gastrointestinal (GI) tract diagnosis of various lesions and abnormalities. Due to a long time required to pass through the GI tract, the resulting WCE data stream contains a large number of frames which leads to a tedious job for c...

journal_title：Journal of applied clinical medical physics

authors： Pogorelov K,Suman S,Azmadi Hussin F,Saeed Malik A,Ostroukhova O,Riegler M,Halvorsen P,Hooi Ho S,Goh KL

更新日期：2019-08-01 00:00:00

abstract：:Using a plane-parallel advanced Markus ionization chamber and a stack of water-equivalent solid phantom blocks, percentage surface and build-up doses of Elekta 6 MV flattening filter (FF) and flattening-filter-free (FFF) beams were measured as a function of the phantom depth for field sizes ranging from 2 × 2 to 10 × ...

journal_title：Journal of applied clinical medical physics

authors： Imae T,Takenaka S,Watanabe Y,Aoki A,Matsuda K,Sasaki K,Saegusa S,Nawa K,Nakagawa K,Abe O

更新日期：2020-12-01 00:00:00

abstract：:The use of a radioactive check device containing Strontium 90 was investigated to carry out the redundancy checks of Farmer-type ionization chambers. It was not possible to meet the recommended tolerance limits of the redundancy checks without taking into account the angular response of the ionization chambers. The io...

journal_title：Journal of applied clinical medical physics

authors： Sidhu NP,Rouvas A,Cadman P

更新日期：2000-10-01 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：:The purpose of this study was to perform comprehensive measurements and testing of a Novalis Tx linear accelerator, and to develop technical guidelines for com-missioning from the time of acceptance testing to the first clinical treatment. The Novalis Tx (NTX) linear accelerator is equipped with, among other features,...

journal_title：Journal of applied clinical medical physics

authors： Kim J,Wen N,Jin JY,Walls N,Kim S,Li H,Ren L,Huang Y,Doemer A,Faber K,Kunkel T,Balawi A,Garbarino K,Levin K,Patel S,Ajlouni M,Miller B,Nurushev T,Huntzinger C,Schulz R,Chetty IJ,Movsas B,Ryu S

更新日期：2012-05-10 00:00:00

abstract：PURPOSE:The weighted CT dose index (CTDIw ) has been extended for a nominal total collimation width (nT) greater than 40 mm and relies on measurements of CTDIfreeair. The purpose of this work was to compare three methods of measuring CTDIfreeair and subsequent calculations of CTDIw to investigate their clinical appropr...

journal_title：Journal of applied clinical medical physics

authors： Bujila R,Kull L,Danielsson M,Andersson J

更新日期：2018-07-01 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

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：:Studies have shown that source dwells within Varian's HDR CT/MR compatible ring applicators can deviate from intended positions by several millimeters. Quantifying this offset is an important part of commissioning. The aims of this study were to: 1) determine the reproducibility of the offset, 2) study the interobserv...

journal_title：Journal of applied clinical medical physics

authors： McMahon R,Zhuang T,Steffey BA,Song H,Craciunescu OI

更新日期：2011-11-15 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：PURPOSE:This study aimed to evaluate dosimetric differences of intensity-modulated radiation therapy (IMRT) in target and normal tissues after breast-conserving surgery. METHODS:IMRT five-field plan I, IMRT six-field plan II, and field-in-field-direct machine parameter optimization-IMRT plan III were designed for each...

journal_title：Journal of applied clinical medical physics

authors： Zhang HW,Hu B,Xie C,Wang YL

更新日期：2018-05-01 00:00:00

abstract：OBJECT:The purpose of this study was to compare two methods of stereotactic localization in Gamma Knife treatment planning: cone beam computed tomography (CBCT) or fiducial. While the fiducial method is the traditional method of localization, CBCT is now available for use with the Gamma Knife Icon. This study seeks to ...

journal_title：Journal of applied clinical medical physics

authors： Duggar WN,Morris B,Fatemi A,Bonds J,He R,Kanakamedala M,Rey-Dios R,Vijayakumar S,Yang C

更新日期：2019-11-01 00:00:00

abstract：:Treatment planning for breast cancer has been traditionally based on clinical landmarks. The Radiation Therapy Oncology Group (RTOG) published consensus guidelines on contouring target volumes (TV) for the breast/chest wall and draining lymphatics. The effect of these guidelines on dosimetric parameters in surrounding...

journal_title：Journal of applied clinical medical physics

authors： Rudra S,Al-Hallaq HA,Feng C,Chmura SJ,Hasan Y

更新日期：2014-03-06 00:00:00

abstract：:True 3D CT dataset for treatment planning of an oversized patient is difficult to acquire due to the bore size and field of view (FOV) reconstruction. This project aims to provide a simple approach to reconstruct true CT data for oversize patients using CT scanner with limited FOV by acquiring double partial CT (left ...

journal_title：Journal of applied clinical medical physics

authors： Wu H,Zhao Q,Cao M,Das I

更新日期：2012-03-08 00:00:00

abstract：:Magnetic resonance imaging (MRI) is regularly used for stereotactic imaging of Gamma Knife (GK) radiosurgery patients for GK treatment planning. MRI-induced thermal injuries have occurred and been reported for GK patients with attached metallic headframes. Depending on the specific MR imaging and headframe conditions,...

journal_title：Journal of applied clinical medical physics

authors： Bennett MC,Wiant DB,Gersh JA,Dolesh W,Ding X,Best RC,Bourland JD

更新日期：2012-07-05 00:00:00

abstract：:The Vero4DRT (MHI-TM2000) is capable of performing X-ray image-based tracking (X-ray Tracking) that directly tracks the target or fiducial markers under continuous kV X-ray imaging. Previously, we have shown that irregular respiratory patterns increased X-ray Tracking errors. Thus, we assumed that audio instruction, w...

journal_title：Journal of applied clinical medical physics

authors： Nakamura M,Sawada A,Mukumoto N,Takahashi K,Mizowaki T,Kokubo M,Hiraoka M

更新日期：2013-09-06 00:00:00

abstract：PURPOSE:This study evaluates the feasibility of lung dose prediction based on target contour and patient anatomy for breast patients treated with proton therapy. METHODS:Fifty-two randomly selected patients were included in the cohort, who were treated to 50.4-66.4 Gy(RBE) to the left (36), right (15), or bilateral (1...

journal_title：Journal of applied clinical medical physics

authors： Zeng C,Sine K,Mah D

更新日期：2018-11-01 00:00:00

abstract：PURPOSE:Volumetric modulated arc therapy (VMAT) is gaining popularity for stereotactic treatment of lung lesions for medically inoperable patients. Due to multiple beamlets in delivery of highly modulated VMAT plans, there are dose delivery uncertainties associated with small-field dosimetry error and interplay effects...

journal_title：Journal of applied clinical medical physics

authors： Pokhrel D,Visak J,Sanford L

更新日期：2020-07-01 00:00:00

abstract：:In this work, the feasibility of using flattening filter free (FFF) beams in volumetric modulated arc therapy (VMAT) total body irradiation (TBI) treatment planning to decrease protracted beam-on times for these treatments was investigated. In addition, a methodology was developed to generate standardized VMAT TBI tre...

journal_title：Journal of applied clinical medical physics

authors： Frederick R,Hudson A,Balogh A,Cao JQ,Pierce G

更新日期：2020-03-01 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

abstract：:The control loop in the Varian DMLC system (V4.8) requires approximately 65 msec to monitor and halt the irradiation of a segment, causing an "overshoot" effect: the segment ends on a fractional monitor unit larger than that planned. As a result, the actual MU delivered may differ from that planned. In general, for st...

journal_title：Journal of applied clinical medical physics

authors： Ezzell GA,Chungbin S

更新日期：2001-07-01 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：:While a few physicists have designed new plan check automation solutions for their clinics, fewer, if any, managed to adapt existing solutions. As complex and varied as the systems they check, these programs must gain the full confidence of those who would run them on countless patient plans. The present automation ef...

journal_title：Journal of applied clinical medical physics

authors： Halabi T,Lu HM

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