Determination of the half-life of I-125 encapsulated clinical seeds using a Si(Li) detector.

Abstract:

:The half-life of two I-125 encapsulated clinical seeds was measured with a Si(Li) semiconductor detector. Two measurements of each seed yielded an average half-life of 59.56 +/- 0.17 days. The results are discussed in terms of the influence of possible I-126 contamination and leakage of I-125 activity through encapsulation. The present results are compared with a frequently cited value of 60.25 +/- 0.06 days. The difference between the two values was found to be statistically significant at a 95% confidence level.

journal_name

Med Phys

journal_title

Medical physics

authors

Kubo H

doi

10.1118/1.595423

subject

Has Abstract

pub_date

1983-11-01 00:00:00

pages

889-91

issue

6

eissn

0094-2405

issn

2473-4209

journal_volume

10

pub_type

杂志文章
  • 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

  • Ultrasonic tissue characterization via 2-D spectrum analysis: theory and in vitro measurements.

    abstract::A theoretical model is described for application in ultrasonic tissue characterization using a calibrated 2-D spectrum analysis method. This model relates 2-D spectra computed from ultrasonic backscatter signals to intrinsic physical properties of tissue microstructures, e.g., size, shape, and acoustic impedance. The ...

    journal_title:Medical physics

    pub_type: 杂志文章

    doi:10.1118/1.2436978

    authors: Liu T,Lizzi FL,Ketterling JA,Silverman RH,Kutcher GJ

    更新日期:2007-03-01 00:00:00

  • Segmentation of bone CT images and assessment of bone structure using measures of complexity.

    abstract::A nondestructive and noninvasive method for numeric characterization (quantification) of the structural composition of human bone tissue has been developed and tested. In order to quantify and to compare the structural composition of bones from 2D computed tomography (CT) images acquired at different skeletal location...

    journal_title:Medical physics

    pub_type: 杂志文章

    doi:10.1118/1.2336501

    authors: Saparin P,Thomsen JS,Kurths J,Beller G,Gowin W

    更新日期:2006-10-01 00:00:00

  • Dose and detectability for a cone-beam C-arm CT system revisited.

    abstract:PURPOSE:The authors had previously published measurements of the detectability of disk-shaped contrast objects in images obtained from a C-arm CT system. A simple approach based on Rose's criterion was used to scale the date, assuming the threshold for the smallest diameter detected should be inversely proportional to ...

    journal_title:Medical physics

    pub_type: 杂志文章

    doi:10.1118/1.3397465

    authors: Ganguly A,Yoon S,Fahrig R

    更新日期:2010-05-01 00:00:00

  • Accuracy of Monte Carlo simulations compared to in-vivo MDCT dosimetry.

    abstract:PURPOSE:The purpose of this study was to assess the accuracy of a Monte Carlo simulation-based method for estimating radiation dose from multidetector computed tomography (MDCT) by comparing simulated doses in ten patients to in-vivo dose measurements. METHODS:MD Anderson Cancer Center Institutional Review Board appro...

    journal_title:Medical physics

    pub_type: 杂志文章

    doi:10.1118/1.4906178

    authors: Bostani M,Mueller JW,McMillan K,Cody DD,Cagnon CH,DeMarco JJ,McNitt-Gray MF

    更新日期:2015-02-01 00:00:00

  • A nonvoxel-based dose convolution/superposition algorithm optimized for scalable GPU architectures.

    abstract:PURPOSE:Real-time adaptive planning and treatment has been infeasible due in part to its high computational complexity. There have been many recent efforts to utilize graphics processing units (GPUs) to accelerate the computational performance and dose accuracy in radiation therapy. Data structure and memory access pat...

    journal_title:Medical physics

    pub_type: 杂志文章

    doi:10.1118/1.4895822

    authors: Neylon J,Sheng K,Yu V,Chen Q,Low DA,Kupelian P,Santhanam A

    更新日期:2014-10-01 00:00:00

  • A computer simulation of wavelet noise reduction in computed tomography.

    abstract::We describe the use of a graphical mathematical spreadsheet programming environment which can be used to simulate the acquisition and reconstruction processes of an x-ray computed tomography (CT) machine. The simulation is used to study the effect of photon counting statistics on the noise in the reconstructed image. ...

    journal_title:Medical physics

    pub_type: 杂志文章

    doi:10.1118/1.598654

    authors: Harpen MD

    更新日期:1999-08-01 00:00:00

  • Attenuation, scattering, and absorption of ultrasound in the skull bone.

    abstract:PURPOSE:Measured values of ultrasound attenuation in bone represent a combination of different loss mechanisms. As a wave is transmitted from a fluid into bone, reflections occur at the interface. In the bone, mode conversion occurs between longitudinal and shear modes and the mechanical wave is scattered by its comple...

    journal_title:Medical physics

    pub_type: 杂志文章

    doi:10.1118/1.3668316

    authors: Pinton G,Aubry JF,Bossy E,Muller M,Pernot M,Tanter M

    更新日期:2012-01-01 00:00:00

  • Automatic learning-based beam angle selection for thoracic IMRT.

    abstract:PURPOSE:The treatment of thoracic cancer using external beam radiation requires an optimal selection of the radiation beam directions to ensure effective coverage of the target volume and to avoid unnecessary treatment of normal healthy tissues. Intensity modulated radiation therapy (IMRT) planning is a lengthy process...

    journal_title:Medical physics

    pub_type: 杂志文章

    doi:10.1118/1.4908000

    authors: Amit G,Purdie TG,Levinshtein A,Hope AJ,Lindsay P,Marshall A,Jaffray DA,Pekar V

    更新日期:2015-04-01 00:00:00

  • Image reconstruction algorithm for a rotating slat collimator.

    abstract::A slat collimator in single photon emission computed tomography consists of a set of parallel slats. As the collimator spins, the detector measures a one-dimensional projection data set. A complete data set can be obtained by rotating the detector/collimator assembly around the object (patient) while the collimator sp...

    journal_title:Medical physics

    pub_type: 杂志文章

    doi:10.1118/1.1485057

    authors: Zeng GL,Gagnon D,Matthews CG,Kolthammer JA,Radachy JD,Hawkins WG

    更新日期:2002-07-01 00:00:00

  • Static multileaf collimator for fast-neutron therapy.

    abstract::This paper describes a multileaf collimator, designed to obtain irregularly shaped neutron fields, that fits into an existing fixed field-size collimator system. The shape of the desired portal field is obtained by appropriately setting the position of each leaf of the collimator. The collimator consists of 40 polyeth...

    journal_title:Medical physics

    pub_type: 杂志文章

    doi:10.1118/1.596084

    authors: Chu JC,Bloch P

    更新日期:1987-03-01 00:00:00

  • Second cancer incidence risk estimates using BEIR VII models for standard and complex external beam radiotherapy for early breast cancer.

    abstract:PURPOSE:To compare organ specific cancer incidence risks for standard and complex external beam radiotherapy (including cone beam CT verification) following breast conservation surgery for early breast cancer. METHOD:Doses from breast radiotherapy and kilovoltage cone beam CT (CBCT) exposures were obtained from thermo...

    journal_title:Medical physics

    pub_type: 杂志文章

    doi:10.1118/1.4748332

    authors: Donovan EM,James H,Bonora M,Yarnold JR,Evans PM

    更新日期:2012-10-01 00:00:00

  • Gafchromic EBT2 film dosimetry in reflection mode with a novel plan-based calibration method.

    abstract:PURPOSE:A dosimetric system formed by Gafchromic EBT2 radiochromic film and Epson Expression 10000XL flatbed scanner was commissioned for dosimetry. In this paper, several open questions concerning the commissioning of radiochromic films for dosimetry were addressed: (a) is it possible to employ this dosimetric system ...

    journal_title:Medical physics

    pub_type: 杂志文章

    doi:10.1118/1.4772075

    authors: Mendez I,Hartman V,Hudej R,Strojnik A,Casar B

    更新日期:2013-01-01 00:00:00

  • Statistical analysis of dose-volume and dose-wall histograms for rectal toxicity following 3D-CRT in prostate cancer.

    abstract::The purpose of this paper is to determine the correlation between dose-volume histogram (DVH) and dose wall-histogram (DWH) in the evaluation of rectal complications for prostate cancer patients treated with three-dimensional conformal radiotherapy (3D-CRT). A retrospective analysis of DVHs and DWHs of a subset of 25 ...

    journal_title:Medical physics

    pub_type: 杂志文章

    doi:10.1118/1.1951427

    authors: García-Vicente F,Zapatero A,Floriano A,Cruz-Conde A,Perez L,Marín A,Mínguez C,Torres JJ

    更新日期:2005-08-01 00:00:00

  • SU-E-T-555: Weighted Four-Dimensional IMRT Planning for Dynamic MLC Tracking Using a Practical and Simple Framework.

    abstract:PURPOSE:We present a simple, practical framework for truly 4D lung IMRT planning based on a weighted individual-phase optimization paradigm. This strategy is specifically developed for use in real-time tumor tracking delivery systems so as to utilize respiratory motion as an additional degree of freedom rather than a c...

    journal_title:Medical physics

    pub_type: 杂志文章

    doi:10.1118/1.4735644

    authors: Tachibana H,Cheung Y,Jain S,Sawant A

    更新日期:2012-06-01 00:00:00

  • Stress analysis using anatomically realistic coronary tree.

    abstract::Plaque rupture with superimposed thrombosis is the main cause of the acute coronary syndromes of unstable angina, myocardial infarction, and sudden death. Endothelial disruption leading to plaque rupture may relate to mechanical fatigue associated with cyclic flexion of plaques. A novel method is proposed to assess st...

    journal_title:Medical physics

    pub_type: 杂志文章

    doi:10.1118/1.1593635

    authors: Wu HC,Chen SY,Shroff SG,Carroll JD

    更新日期:2003-11-01 00:00:00

  • On calculating kerma, collision kerma and radiative yields.

    abstract:PURPOSE:To study the relationships between dose (D), kerma (K), and collision kerma ( K col ) in photon beams and to investigate total radiative yields for electrons and positrons as a functio...

    journal_title:Medical physics

    pub_type: 杂志文章

    doi:10.1002/mp.13744

    authors: Rogers DWO,Townson RW

    更新日期:2019-11-01 00:00:00

  • Elements of microdosimetry.

    abstract::This is an introductory tutorial to the field of microdosimetry. Following a brief historical outline, we review the physics of experimental and theoretical microdosimetry and the application of microdosimetry to radiation biology within the so-called "site" approximation. Modern interpretations of microdosimetry that...

    journal_title:Medical physics

    pub_type: 杂志文章,评审

    doi:10.1118/1.596616

    authors: Rossi HH,Zaider M

    更新日期:1991-11-01 00:00:00

  • A scanning system for chest radiography with regional exposure control: theoretical considerations.

    abstract::Conventional chest radiography is limited by the presence of scattered radiation and the small useful exposure range of radiographic film. A computer-assisted scanning system to minimize these two effects is outlined. The system uses a small beam of radiation swept over the patient's chest in a raster pattern to expos...

    journal_title:Medical physics

    pub_type: 杂志文章

    doi:10.1118/1.595327

    authors: Plewes DB

    更新日期:1983-09-01 00:00:00

  • Task Group 284 Report: Magnetic Resonance Imaging Simulation in Radiotherapy: Considerations for Clinical Implementation, Optimization, and Quality Assurance.

    abstract::The use of dedicated magnetic resonance simulation (MR-SIM) platforms in Radiation Oncology has expanded rapidly, introducing new equipment and functionality with the overall goal of improving the accuracy of radiation treatment planning. However, this emerging technology presents a new set of challenges that need to ...

    journal_title:Medical physics

    pub_type: 杂志文章

    doi:10.1002/mp.14695

    authors: Glide-Hurst CK,Paulson ES,McGee K,Tyagi N,Hu Y,Balter J,Bayouth J

    更新日期:2021-01-01 00:00:00

  • Poster - Thur Eve - 64: Evaluation of SmartArc and RapidArc for lung SBRT treatment planning and delivery.

    abstract:OBJECTIVES:To evaluate the performance of RapidArc® (Eclipse 10.0.28) and SmartArc® (Pinnacle 9.0) radiotherapy plans for lung stereotactic body radiation therapy (SBRT) in terms of dosimetric plan quality, delivery efficiency, inhomogeneity corrections and accuracy of dose delivery using a custom-built heterogeneity i...

    journal_title:Medical physics

    pub_type: 杂志文章

    doi:10.1118/1.4740172

    authors: Fakir H,Hoover D,Chen JZ

    更新日期:2012-07-01 00:00:00

  • Three-dimensional x-ray fluorescence mapping of a gold nanoparticle-loaded phantom.

    abstract:PURPOSE:X-ray fluorescence (XRF) is a promising technique with sufficient specificity and sensitivity for identifying and quantifying features in small samples containing high atomic number (Z) materials such as iodine, gadolinium, and gold. In this study, the feasibility of applying XRF to early breast cancer diagnosi...

    journal_title:Medical physics

    pub_type: 杂志文章

    doi:10.1118/1.4863510

    authors: Ren L,Wu D,Li Y,Wang G,Wu X,Liu H

    更新日期:2014-03-01 00:00:00

  • Choice of material for HVL measurements in megavoltage x-ray beams.

    abstract::The relative sensitivity of the half-value layer (HVL) method as a quality index for megavoltage x-ray beams is examined by theoretical calculation and experimental measurements for 4-, 6-, 10-, and 25-MV x-ray beams. It is shown that lower atomic number materials are more sensitive to beam quality changes than higher...

    journal_title:Medical physics

    pub_type: 杂志文章

    doi:10.1118/1.595794

    authors: Meli JA,Nath R

    更新日期:1985-01-01 00:00:00

  • The tracks of the Compton effect.

    abstract::The observation of scattered radiations of larger wavelength than the primary had been repeatedly rejected or explained away by many researchers, including Compton. After years of vacillations, he recognized the effect named after him and was the first to develop a quantal equation predicting the wavelength of scatter...

    journal_title:Medical physics

    pub_type: 传,历史文章,杂志文章

    doi:10.1118/1.595046

    authors: del Regato JA

    更新日期:1981-11-01 00:00:00

  • Technical Note: A benchtop cone-beam x-ray fluorescence computed tomography (XFCT) system with a high-power x-ray source and transmission CT imaging capability.

    abstract:PURPOSE:This report describes upgrades and performance characterization of an experimental benchtop cone-beam x-ray fluorescence computed tomography (XFCT) system capable of determining the spatial distribution and concentration of metal probes such as gold nanoparticles (GNPs). Specifically, a high-power (~3 kW) indus...

    journal_title:Medical physics

    pub_type: 杂志文章

    doi:10.1002/mp.13138

    authors: Manohar N,Reynoso FJ,Cho SH

    更新日期:2018-10-01 00:00:00

  • Fluid-filled dynamic bowtie filter: Description and comparison with other modulators.

    abstract:PURPOSE:A dynamic bowtie filter can modulate flux along both fan and view angles for reduced patient dose, scatter, and required photon flux, which is especially important for photon counting detectors (PCDs). Among the proposed dynamic bowtie designs, the piecewise-linear attenuator (Hsieh and Pelc, Med Phys. 2013;40:...

    journal_title:Medical physics

    pub_type: 杂志文章

    doi:10.1002/mp.13272

    authors: Shunhavanich P,Hsieh SS,Pelc NJ

    更新日期:2019-01-01 00:00:00

  • Measurement of dose distributions using film in therapeutic electron beams.

    abstract::The feasibility of using film dosimetry data as the input data for patient treatment planning was evaluated. The central-axis depth dose and the off-axis ratios obtained from film measurements in a solid phantom were compared with those of ion-chamber measurements in water. Two techniques were used to generate isodose...

    journal_title:Medical physics

    pub_type: 杂志文章

    doi:10.1118/1.596409

    authors: Shiu AS,Otte VA,Hogstrom KR

    更新日期:1989-11-01 00:00:00

  • Analysis of fractionation correction methodologies for multiple phase treatment plans in radiation therapy.

    abstract:PURPOSE:Radiation therapy is often delivered by multiple sequential treatment plans. For an accurate radiobiological evaluation of the overall treatment, fractionation corrections to each dose distribution must be applied before summing the three-dimensional dose matrix of each plan since the simpler approach of perfor...

    journal_title:Medical physics

    pub_type: 杂志文章

    doi:10.1118/1.4792636

    authors: Mavroidis P,Ferreira BC,Papanikolaou N,Lopes Mdo C

    更新日期:2013-03-01 00:00:00

  • Effects of x-ray beam equalization on mammographic imaging.

    abstract::We employed an elastic reservoir filled with tissue-equivalent fluid as an x-ray beam filter for exposure equalization. The filter is designed to be placed between the upper compression plate and the breast. During compression, it will conform to the shape of the peripheral region of the breast and fill the space betw...

    journal_title:Medical physics

    pub_type: 杂志文章

    doi:10.1118/1.596502

    authors: Lam KL,Chan HP

    更新日期:1990-03-01 00:00:00

  • Technical Note: modification of the standard gain correction algorithm to compensate for the number of used reference flat frames in detector performance studies.

    abstract:PURPOSE:The x-ray performance evaluation of digital x-ray detectors is based on the calculation of the modulation transfer function (MTF), the noise power spectrum (NPS), and the resultant detective quantum efficiency (DQE). The flat images used for the extraction of the NPS should not contain any fixed pattern noise (...

    journal_title:Medical physics

    pub_type: 杂志文章

    doi:10.1118/1.3664003

    authors: Konstantinidis AC,Olivo A,Speller RD

    更新日期:2011-12-01 00:00:00