abstract：:The authors compared the relative dosimetric merits of Gamma Knife (GK) and CyberKnife (CK) in 15 patients with 26 brain metastases. All patients were initially treated with the Leksell GK 4C. The same patients were used to generate comparative CK treatment plans. The tissue volume receiving more than 12 Gy (V12), the...

journal_title：Journal of applied clinical medical physics

authors： Sio TT,Jang S,Lee SW,Curran B,Pyakuryal AP,Sternick ES

更新日期：2014-01-06 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 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

abstract：:Substantial disagreement exists over appropriate PET segmentation techniques for non-small cell lung cancer. Currently, no segmentation algorithm explicitly considers tumor motion in determining tumor borders. We developed an automatic PET segmentation model as a function of target volume, motion extent, and source-to...

journal_title：Journal of applied clinical medical physics

authors： Riegel AC,Bucci MK,Mawlawi OR,Ahmad M,Luo D,Chandler A,Pan T

更新日期：2014-01-06 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：: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：:Small field dosimetry is a challenging task. The difficulties of small field measurements, particularly stereotactic field size measurements, are highlighted by the large interinstitution variability that can be observed for circular cone collimator commissioning measurements. We believe the best way to improve the co...

journal_title：Journal of applied clinical medical physics

authors： Wiant DB,Terrell JA,Maurer JM,Yount CL,Sintay BJ

更新日期：2013-11-04 00:00:00

abstract：:This study evaluated the extent of improvement in dose predication accuracy achieved by the Fast Monte Carlo algorithm (MC) compared to the Ray Tracing algorithm (RAT) in stereotactic body radiotherapy (SBRT) of non-small cell lung cancer (NSCLC), and how their differences were influenced by the tumor site and size. T...

journal_title：Journal of applied clinical medical physics

authors： Wu VW,Tam KW,Tong SM

更新日期：2013-09-06 00:00:00

abstract：:The monochromatic images acquired by Gemstone spectral imaging (GSI) mode on the GE CT750 HD theoretically determines the computed tomography (CT) number more accurately than that of conventional scanner. Using the former, the CT number is calculated from (synthesized) monoenergetic X-ray data. We reasoned that the mo...

journal_title：Journal of applied clinical medical physics

authors： Yagi M,Ueguchi T,Koizumi M,Ogata T,Yamada S,Takahashi Y,Sumida I,Akino Y,Konishi K,Isohashi F,Tomiyama N,Yoshioka Y,Ogawa K

更新日期：2013-09-06 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：: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：:We retrospectively generated IMRT plans for 14 NSCLC patients who had experienced grade 2 or 3 esophagitis (CTCAE version 3.0). We generated 11-beam and reduced esophagus dose plan types to compare changes in the volume and length of esophagus receiving doses of 50, 55, 60, 65, and 70 Gy. Changes in planning target vo...

journal_title：Journal of applied clinical medical physics

authors： Niedzielski J,Bluett JB,Williamson RT,Liao Z,Gomez DR,Court LE

更新日期：2013-07-08 00:00:00

abstract：:This study investigates the dosimetry and radiobiological model variation when a second photon arc was added to prostate volumetric-modulated arc therapy (VMAT) using the single-arc technique. Dosimetry and radiobiological model comparison between the single-arc and double-arc prostate VMAT plans were performed on fiv...

journal_title：Journal of applied clinical medical physics

authors： Chow JC,Jiang R

更新日期：2013-05-06 00:00:00

abstract：:The purpose of this study was to compare two different styles of prostate IGRT: bony landmark (BL) setup vs. fiducial markers (FM) setup. Twenty-nine prostate patients were treated with daily BL setup and 30 patients with daily FM setup. Delivered dose distribution was reconstructed on cone-beam CT (CBCT) acquired onc...

journal_title：Journal of applied clinical medical physics

authors： Paluska P,Hanus J,Sefrova J,Rouskova L,Grepl J,Jansa J,Kasaova L,Hodek M,Zouhar M,Vosmik M,Petera J

更新日期：2013-05-06 00:00:00

abstract：:Stereotactic body radiation therapy (SBRT) has been increasingly used as an efficacious treatment modality for early-stage non-small cell lung cancer. The accuracy of dose calculations is compromised due to the presence of inhomogeneity. For the purpose of a consistent prescription, radiation doses were calculated wit...

journal_title：Journal of applied clinical medical physics

authors： Zhuang T,Djemil T,Qi P,Magnelli A,Stephans K,Videtic G,Xia P

更新日期：2013-03-04 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 image-guided radiotherapy technique (IGRT) makes use of imaging devices to verify the positions of the target volume and organs at risk during the treatment sessions. In this work we evaluate the image quality provided by an imaging system based on a kilovoltage cone-beam CT, and explore its ability to perform IGR...

journal_title：Journal of applied clinical medical physics

authors： Garayoa J,Castro P

更新日期：2013-01-07 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：:Many head-and-neck cancer (HNC) patients treated with radiotherapy suffer significant anatomical changes due to tumor shrinkage or weight loss. The purpose of this study was to assess dose changes over target volumes and organs at risk during intensity-modulated radiotherapy for HNC patients. Sixteen HNC IMRT patients...

journal_title：Journal of applied clinical medical physics

authors： Beltran M,Ramos M,Rovira JJ,Perez-Hoyos S,Sancho M,Puertas E,Benavente S,Ginjaume M,Giralt J

更新日期：2012-11-08 00:00:00

abstract：:This work illustrates a procedure to assess the overall accuracy associated with Gamma Knife treatment planning using plugging. The main role of source plugging or blocking is to create dose falloff in the junction between a target and a critical structure. We report the use of MAGAT gel dosimeter for verification of ...

journal_title：Journal of applied clinical medical physics

authors： Natanasabapathi G,Subbiah V,Kale SS,Rath GK,Senthilkumaran S,Thulkar S,Subramani V,Laviraj MA,Bisht RK,Mahapatra AK

更新日期：2012-11-08 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 objective of this work is the investigation of intense pulsed light (IPL) photoepilation using Monte Carlo simulation to model the effect of the output dosimetry with millisecond exposure used by typical commercial IPL systems. The temporal pulse shape is an important parameter, which may affect the biological tis...

journal_title：Journal of applied clinical medical physics

authors： Ash C,Donne K,Daniel G,Town G,Clement M,Valentine R

更新日期：2012-09-06 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：: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：: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 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 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：: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：: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：: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：:Part II of this review article presents four case studies for which peak skin doses are calculated following the methods outlined in Part I of this review. The data available in the cases ranges from proprietary dose reports to fluoroscopy time and number of digital acquisition frames only. Flowcharts are provided for...

journal_title：Journal of applied clinical medical physics

authors： Jones AK,Pasciak AS

更新日期：2012-01-05 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：:The use of solid carbon fiber table materials in radiotherapy has become more common with the implementation of image-guided radiotherapy (IGRT), since the solid materials give less imaging artifacts than the so-called tennis racket couchtops. The downside of the solid carbon fiber couch inserts is that they increase ...

journal_title：Journal of applied clinical medical physics

authors： Seppälä JK,Kulmala JA

更新日期：2011-11-15 00:00:00

abstract：:The purpose of this study was to quantify the intrafraction motion of pediatric patients with brain tumors during radiation therapy and investigate any correlation between motion, use of general anesthesia, and daily treatment duration. 100 pediatric patients with a mean age of 8.5 years (range: 1.0 to 17.8) were incl...

journal_title：Journal of applied clinical medical physics

authors： Beltran C,Merchant TE

更新日期：2011-11-15 00:00:00

abstract：:The purpose of this study is to simulate random and systematic RapidArc delivery errors for external beam prostate radiotherapy plans in order to determine the dose sensitivity for each error type. Ten prostate plans were created with a single 360° arc. The DICOM files for these treatment plans were then imported into...

journal_title：Journal of applied clinical medical physics

authors： Oliver M,Bush K,Zavgorodni S,Ansbacher W,Beckham WA

更新日期：2011-05-20 00:00:00

abstract：:Physical and dosimetric characteristics of HDMLC were studied for SRS6, 6, and 10 MV X-rays from Novalis Tx. This in-built tertiary collimator consists of 60 pairs (32 × 0.25 cm; 26 × 0.5 cm and 2 × 0.7 cm) of leaves. Properties of HDMLC studied included alignment, readout and radiation field congruence, radiation pen...

journal_title：Journal of applied clinical medical physics

authors： Sharma DS,Dongre PM,Mhatre V,Heigrujam M

更新日期：2011-04-14 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 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：: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：:The purpose was to assess the variability in automated translational head/neck setup corrections computed from several different imaging modalities and rigid registration methods using patient anatomy. Shifts were calculated using three commercial and one in-house automated rigid registration methods for nine head/nec...

journal_title：Journal of applied clinical medical physics

authors： Dogan N,Song S,Saleh H,Wu J,Murphy MJ

更新日期：2010-10-13 00:00:00