Calculation of surface dose in rotational total skin electron irradiation.

Abstract:

:A single-field rotational total skin electron irradiation technique has recently been developed at the McGill University for treatment of skin malignancies. The dose received by a given surface point during rotation in a uniform large electron field depends on the radius of rotation of the surface point, on the local radius of curvature of the contour in the vicinity of the point of interest, and on the shadows cast by limbs (arms upon trunk or head and neck, and legs upon each other). A method for calculating the surface dose distribution on a patient is presented accounting for the various parameters affecting the dose. A series of measurements were performed with polystyrene and a humanoid phantom, and an excellent agreement between measured and calculated dose distributions was obtained.

journal_name

Med Phys

journal_title

Medical physics

authors

Pla C,Heese R,Pla M,Podgorsak EB

doi

10.1118/1.595524

subject

Has Abstract

pub_date

1984-07-01 00:00:00

pages

539-46

issue

4

eissn

0094-2405

issn

2473-4209

journal_volume

11

pub_type

杂志文章
  • Analysis of the significance of scattered radiation in reduced dose mammography, including magnification effects, scatter suppression, and focal spot and detector blurring.

    abstract::A systems analysis of reduced dose mammography with scatter removal has quantitatively specified the relationships between the several parameters in mammography systems. While the results are only preliminary in the sense that they need to be proven experimentally, they do seem to provide a good feel for the nature of...

    journal_title:Medical physics

    pub_type: 杂志文章

    doi:10.1118/1.594540

    authors: Muntz EP

    更新日期:1979-03-01 00:00:00

  • A randomization approach to handling data scaling in nuclear medicine.

    abstract:PURPOSE:In medical imaging, data scaling is sometimes desired to handle the system complexity, such as uniformity calibration. Since the data are usually saved in short integer, conventional data scaling will first scale the data in floating point format and then truncate or round the floating point data to short integ...

    journal_title:Medical physics

    pub_type: 杂志文章

    doi:10.1118/1.3431573

    authors: Bai C,Conwell R,Kindem J

    更新日期:2010-06-01 00:00:00

  • MRI-related FDA adverse event reports: A 10-yr review.

    abstract:PURPOSE:To provide an overview of the types of adverse events reported to the US Food and Drug Administration (US FDA) for magnetic resonance (MR) systems over a 10-yr period. METHODS:Two reviewers independently reviewed adverse events reported to FDA for MR systems from 1 January 2008 to 31 December 2017 and manually...

    journal_title:Medical physics

    pub_type: 杂志文章,评审

    doi:10.1002/mp.13768

    authors: Delfino JG,Krainak DM,Flesher SA,Miller DL

    更新日期:2019-12-01 00:00:00

  • 3D modeling of effects of increased oxygenation and activity concentration in tumors treated with radionuclides and antiangiogenic drugs.

    abstract:PURPOSE:Formation of new blood vessels (angiogenesis) in response to hypoxia is a fundamental event in the process of tumor growth and metastatic dissemination. However, abnormalities in tumor neovasculature often induce increased interstitial pressure (IP) and further reduce oxygenation (pO2) of tumor cells. In radiot...

    journal_title:Medical physics

    pub_type: 杂志文章

    doi:10.1118/1.3615164

    authors: Lagerlöf JH,Kindblom J,Bernhardt P

    更新日期:2011-08-01 00:00:00

  • Measurement of primary bremsstrahlung spectrum from an 8-MeV linear accelerator.

    abstract::The bremsstrahlung spectrum from an 8-MeV linear accelerator has been measured using a NaI(T1) spectrometer system. The spectrum shows a low-energy cutoff at 0.4 MeV and the maximum photon energy to be approximately 6% greater than the nominal energy. The maximum emission of energy fluence was 1.6 and 1.8 MeV for meas...

    journal_title:Medical physics

    pub_type: 杂志文章

    doi:10.1118/1.594221

    authors: Levy LB,Waggener RG,Wright AE

    更新日期:1976-05-01 00:00:00

  • SU-E-T-424: Inter-Fraction Variation of High Dose Regions of OARS in MR Image Based Cervix Brachytherapy Using Rigid Registration.

    abstract:PURPOSE:To quantify the inter fraction variation of spatial location of high dose regions of OARs in MR-image based cervix brachytherapy using rigid registration algorithm. METHODS:Retrospective analysis of 27 previously treated patients under EMBRACE multi-centric trial was evaluated. Each patient had two application...

    journal_title:Medical physics

    pub_type: 杂志文章

    doi:10.1118/1.4735513

    authors: Swamidas J,Mahantshetty U,Deshpande D,Shrivastava S

    更新日期:2012-06-01 00:00:00

  • Correcting TG 119 confidence limits.

    abstract:PURPOSE:Task Group 119 (TG-119) has been adopted for evaluating the adequacy of intensity-modulated radiation therapy (IMRT) commissioning and for establishing patient-specific IMRT quality assurance (QA) passing criteria in clinical practice. TG-119 establishes 95% confidence limits (CLs), which help clinics identify ...

    journal_title:Medical physics

    pub_type: 杂志文章

    doi:10.1002/mp.12759

    authors: Kearney V,Solberg T,Jensen S,Cheung J,Chuang C,Valdes G

    更新日期:2018-03-01 00:00:00

  • A formal study of lateral magnification and its influence on mammographic imaging sharpness.

    abstract::Radiographic magnification is often employed in mammography to improve detection of small anatomical details of clinical interest, such as microcalcifications. The image size depends on the conventional magnification factor, on the focal spot size, and on the x-ray angulation. In this paper magnification effects are i...

    journal_title:Medical physics

    pub_type: 杂志文章

    doi:10.1118/1.597288

    authors: Schiabel H,Ventura A,Frère AF

    更新日期:1994-02-01 00:00:00

  • Intensity-modulation radiotherapy using independent collimators: an algorithm study.

    abstract::The purpose of this work is to investigate algorithms for the delivery of intensity-modulated fields using independent collimators (IC). Two heuristic algorithms are proposed to calculate jaw-setting sequences for arbitrary 2D intensity distributions. The first algorithm is based on searching the whole intensity matri...

    journal_title:Medical physics

    pub_type: 杂志文章

    doi:10.1118/1.598794

    authors: Dai JR,Hu YM

    更新日期:1999-12-01 00:00:00

  • Design and performance of a compact and stationary microSPECT system.

    abstract:PURPOSE:Over the last ten years, there has been an extensive growth in the development of microSPECT imagers. Most of the systems are based on the combination of conventional, relatively large gamma cameras with poor intrinsic spatial resolution and multipinhole collimators working in large magnification mode. Spatial ...

    journal_title:Medical physics

    pub_type: 杂志文章

    doi:10.1118/1.4822621

    authors: Van Holen R,Vandeghinste B,Deprez K,Vandenberghe S

    更新日期:2013-11-01 00:00:00

  • A multi-institutional study to assess adherence to lung stereotactic body radiotherapy planning goals.

    abstract:PURPOSE:A multi-institutional planning study was performed to evaluate the frequency that current guidelines established by Radiation Therapy Oncology Group (RTOG) protocols and other literature for lung stereotactic body radiotherapy (SBRT) treatments are followed. METHODS:A total of 300 patients receiving lung SBRT ...

    journal_title:Medical physics

    pub_type: 杂志文章,多中心研究

    doi:10.1118/1.4926551

    authors: Woerner A,Roeske JC,Harkenrider MM,Fan J,Aydogan B,Koshy M,Laureckas R,Vali F,Campana M,Surucu M

    更新日期:2015-08-01 00:00:00

  • A water phantom controller for automated acquisition of linac beam parameters.

    abstract::Three-dimensional water phantoms are routinely used when acquiring the data necessary to commission medical linear accelerators. A new water phantom controller has been developed at our institution that is unique in several aspects. The water phantom controller is based on an IBM XT compatible computer. This has been ...

    journal_title:Medical physics

    pub_type: 杂志文章

    doi:10.1118/1.596414

    authors: Schmid MG,Morris RL

    更新日期:1989-01-01 00:00:00

  • SU-D-BRA-02: An Extended Time-Variant Seasonal Autoregressive Model-Based Prediction for Irregular Breathing Motion Tracking.

    abstract:PURPOSE:Real-time tumor position/shape measurement and dynamic beam tracking techniques allow accurate and continuous irradiation to moving tumor, but there can be a delay of several hundred milliseconds between observation and irradiation. A time-variant seasonal autoregressive (TVSAR) model has been proposed for comp...

    journal_title:Medical physics

    pub_type: 杂志文章

    doi:10.1118/1.4734680

    authors: Ichiji K,Homma N,Sakai M,Narita Y,Takai Y,Yoshizawa M

    更新日期:2012-06-01 00:00:00

  • Response of an implantable MOSFET dosimeter to 192Ir HDR radiation.

    abstract::New in vivo dosimetry methods would be useful for clinical HDR brachytherapy. An implantable MOSFET Dose Verification System designed by Sicel Technologies, Inc. was examined for use with 192Ir HDR applications. This investigation demonstrated that varying the dose rate from 22 to 84 cGy/min did not change detector re...

    journal_title:Medical physics

    pub_type: 杂志文章

    doi:10.1118/1.3013574

    authors: Fagerstrom JM,Micka JA,DeWerd LA

    更新日期:2008-12-01 00:00:00

  • Electron backscatter corrections for parallel-plate chambers.

    abstract::The wall of an ionization chamber is commonly assumed to have a negligible effect on chamber response in electron beams. For cylindrical chambers with thin walls this assumption is valid. However, parallel-plate chambers commonly possess large mechanical supports which may affect chamber response in a manner not accou...

    journal_title:Medical physics

    pub_type: 杂志文章

    doi:10.1118/1.596165

    authors: Hunt MA,Kutcher GJ,Buffa A

    更新日期:1988-01-01 00:00:00

  • Rapid in vivo localization of a lost brachytherapy seed.

    abstract::We adapted a small sodium iodide scintillation detector for rapid, in vivo localization of a lost brachytherapy seed. Using the detector, we were able to locate and remove an Ir-192 seed that was not visible to the unaided eye. ...

    journal_title:Medical physics

    pub_type: 杂志文章

    doi:10.1118/1.595528

    authors: Woolfenden JM,Barber HB,Oleson JR,Wild WJ

    更新日期:1984-07-01 00:00:00

  • Intercomparison of methods for image quality characterization. I. Modulation transfer function.

    abstract::The modulation transfer function (MTF) and the noise power spectrum (NPS) are widely recognized as the most relevant metrics of resolution and noise performance in radiographic imaging. These quantities have commonly been measured using various techniques, the specifics of which can have a bearing on the accuracy of t...

    journal_title:Medical physics

    pub_type: 杂志文章

    doi:10.1118/1.2188816

    authors: Samei E,Ranger NT,Dobbins JT 3rd,Chen Y

    更新日期:2006-05-01 00:00:00

  • An empirical model for independent dose verification of the Gamma Knife treatment planning.

    abstract::A formalism for an independent dose verification of the Gamma Knife treatment planning is developed. It is based on the approximation that isodose distribution for a single shot is in the shape of an ellipsoid in three-dimensional space. The dose profiles for a phantom along each of the three major axes are fitted to ...

    journal_title:Medical physics

    pub_type: 杂志文章

    doi:10.1118/1.1501139

    authors: Phaisangittisakul N,Ma L

    更新日期:2002-09-01 00:00:00

  • Measurement of transit time of a remote after-loading high dose rate brachytherapy source.

    abstract::Quantification of transit time of a remote after-loading high dose rate (HDR) brachytherapy source is important both for accurate treatment planning and for quality assurance checks. In this investigation, an HDR-1000 well ionization chamber and a precision electrometer are used to measure the transit time of the Ir-1...

    journal_title:Medical physics

    pub_type: 杂志文章

    doi:10.1118/1.1386779

    authors: Sahoo N

    更新日期:2001-08-01 00:00:00

  • The Jacobian as a measure of planar dose congruence.

    abstract::We propose a new starting point for comparing planar dose distributions using a Jacobian-based measure. The measure is normalization independent, i.e., is sensitive to dose patterns while not being biased by global dose scaling. The measure is free of tunable parameters and is bounded between zero and one. We also pro...

    journal_title:Medical physics

    pub_type: 杂志文章

    doi:10.1118/1.2982136

    authors: Paniak LD,Charland PM

    更新日期:2008-11-01 00:00:00

  • Application of solid state detectors for dosimetry of therapeutic proton beams.

    abstract::A PTW Riga diamond detector and LiF TLDs have been evaluated for use in proton beam dosimetry by comparing results of proton beam calibration with those obtained using thimble ionization chambers. The thimble ionization chambers were calibrated in terms of exposure while the TLDs and diamond detector were calibrated i...

    journal_title:Medical physics

    pub_type: 杂志文章

    doi:10.1118/1.597608

    authors: Vatnitsky S,Miller D,Siebers J,Moyers M

    更新日期:1995-04-01 00:00:00

  • A regional convolution kernel algorithm for scatter correction in dual-energy images: comparison to single-kernel algorithms.

    abstract::Single kernel scatter correction algorithms are based on the model that the scatter field can be predicted by convolution of the primary intensity (Iprim) with a spatially invariant scatter point-spread function (PSF). Practical limitations (Iprim unknown) suggest the substitution of the total detected intensity (Idet...

    journal_title:Medical physics

    pub_type: 杂志文章

    doi:10.1118/1.597297

    authors: Kruger DG,Zink F,Peppler WW,Ergun DL,Mistretta CA

    更新日期:1994-02-01 00:00:00

  • The physics of cancer therapy with negative pions.

    abstract::The introduction of negative pions into cancer therapy has required the construction of large new proton accelerators together with special magnetic systems to form and direct the pion beam to a patient. A summary is presented of the fundamental properties of pions and of the methods used to study the therapeutic beam...

    journal_title:Medical physics

    pub_type: 杂志文章,评审

    doi:10.1118/1.594868

    authors: Richman C

    更新日期:1981-05-01 00:00:00

  • Penetration quality measurement for standardization of radiographic image quality.

    abstract::Interchange or transfer of radiographic techniques through measurement of penetration quality is discussed. The usefulness of this achievement is verified using an aluminum step wedge. Also, the procedure described provides a method for performance evaluation of kVp compensation on diagnostic x-ray installations. ...

    journal_title:Medical physics

    pub_type: 杂志文章

    doi:10.1118/1.594156

    authors: Lin PJ

    更新日期:1975-01-01 00:00:00

  • Intensity inhomogeneity correction for magnetic resonance imaging of human brain at 7T.

    abstract:PURPOSE:To evaluate the performance and efficacy for intensity inhomogeneity correction of various sequences of the human brain in 7T MRI using the extended version of the unified segmentation algorithm. MATERIALS:Ten healthy volunteers were scanned with four different sequences (2D spin echo [SE], 3D fast SE, 2D fast...

    journal_title:Medical physics

    pub_type: 杂志文章

    doi:10.1118/1.4860954

    authors: Uwano I,Kudo K,Yamashita F,Goodwin J,Higuchi S,Ito K,Harada T,Ogawa A,Sasaki M

    更新日期:2014-02-01 00:00:00

  • The water-equivalence of phantom materials for 90Sr-90Y beta particles.

    abstract::Intravascular brachytherapy requires that the dose be specified within millimeters of the source. High dose gradients near brachytherapy sources require that the source-detector distance be accurately known for dosimetry purposes. Solid phantoms can be designed to accommodate these stringent requirements. This study r...

    journal_title:Medical physics

    pub_type: 杂志文章

    doi:10.1118/1.1376176

    authors: Buckley LA,Thomadsen BR,DeWerd LA

    更新日期:2001-06-01 00:00:00

  • SU-E-T-181: Development of a Single-Marker-Based Optical Tracking System to Enhance Patient Safety in Radiotherapy.

    abstract:PURPOSE:To develop an accurate and efficient single-marker-based optical tracking system to enhance patient safety and quality of care in radiotherapy. METHODS:The optical tracking system consists of a Polaris camera as well as in-house software. The camera is mounted inside the treatment room and detects the location...

    journal_title:Medical physics

    pub_type: 杂志文章

    doi:10.1118/1.4735240

    authors: Yan G,Lu B,Mittauer K,Liu C,Li J

    更新日期:2012-06-01 00:00:00

  • Deconvolution techniques for removing the effects of chemical shift in 19F nuclear magnetic resonance imaging of perfluorocarbon compounds.

    abstract::Nuclear magnetic resonance (NMR) imaging of perfluorocarbon (PFC) emulsions and neat liquids has shown potential for in vivo oxygen imaging in blood and organ tissue. PFC compounds exhibit complicated NMR spectra caused by chemical shifts and spin-spin couplings which can lead to artifacts and degraded spatial resolut...

    journal_title:Medical physics

    pub_type: 杂志文章

    doi:10.1118/1.595960

    authors: Busse LJ,Thomas SR,Pratt RG,Clark LC Jr,Ackerman JL,Samaratunga RC,Hoffmann RE

    更新日期:1986-07-01 00:00:00

  • Use of simulated annealing for optimization of alignment parameters in limited MRI acquisition volumes of the brain.

    abstract::Studies suggest that clinical outcomes are improved in repeat trigeminal neuralgia (TN) Gamma Knife radiosurgery if a different part of the nerve from the previous radiosurgery is treated. The MR images taken in the first and repeat radiosurgery need to be coregistered to map the first radiosurgery volume onto the sec...

    journal_title:Medical physics

    pub_type: 杂志文章

    doi:10.1118/1.1944287

    authors: Li X,Zhang P,Brisman R,Kutcher G

    更新日期:2005-07-01 00:00:00

  • Noise power spectra of images from digital mammography detectors.

    abstract::Noise characterization through estimation of the noise power spectrum (NPS) is a central component of the evaluation of digital x-ray systems. We begin with a brief review of the fundamentals of NPS theory and measurement, derive explicit expressions for calculation of the one- and two-dimensional (1D and 2D) NPS, and...

    journal_title:Medical physics

    pub_type: 杂志文章

    doi:10.1118/1.598623

    authors: Williams MB,Mangiafico PA,Simoni PU

    更新日期:1999-07-01 00:00:00