A comparative study of rectal dose histograms in prostate brachytherapy: some analytic and numerical results.

Abstract:

:A cumulative dose histogram is the graph of an integral function integrated over a domain VCR3 and is dubbed the dose-volume histogram (DVH), the dose-surface histogram (DSH) or the dose-wall histogram (DWH), depending on the dimension and structure of the region V. This paper presents a comparative study of the three rectal dose histograms for sixty patients as well as for a cylindrical model of the rectum; in particular, the DSH and DVH for the cylindrical model with one point source are computed analytically in terms of elliptic integrals. The difference among the three relative dose histograms, averaged over the sixty patients, is less than 5%, whereas that between DVH and DWH for various wall-thickness can be as large as 3-12 cm3 in the range 60-100 Gy. The paper also contains an error analysis using two simple models of the rectum, for which the true DSH and DWH can be computed via numerical integration, to evaluate the effect of digitization. The digitized computation agrees quite well with the pre-digitization numerical integration, within 1% or 0.2 cm3, because of the low dose-gradient effect near the rectum in prostate brachytherapy.

journal_name

Med Phys

journal_title

Medical physics

authors

Song JS,Albert M,D'Amico AV,Cormack RA

doi

10.1118/1.1852811

subject

Has Abstract

pub_date

2005-02-01 00:00:00

pages

437-47

issue

2

eissn

0094-2405

issn

2473-4209

journal_volume

32

pub_type

临床试验,杂志文章
  • Deadtime correction for two multihead Anger cameras in 131I dual-energy-window-acquisition mode.

    abstract::Two side-by-side energy windows, one at the photopeak and one at lower energy, are sometimes employed in quantitative SPECT studies. We measured the count-rate losses at moderately high activities of 131I for two multihead Anger cameras in such a dual-window-acquisition mode by imaging a decaying source composed of tw...

    journal_title:Medical physics

    pub_type: 杂志文章

    doi:10.1118/1.598162

    authors: Koral KF,Zasadny KR,Ackermann RJ,Ficaro EP

    更新日期:1998-01-01 00:00:00

  • Selecting registration schemes in case of interstitial lung disease follow-up in CT.

    abstract:PURPOSE:Primary goal of this study is to select optimal registration schemes in the framework of interstitial lung disease (ILD) follow-up analysis in CT. METHODS:A set of 128 multiresolution schemes composed of multiresolution nonrigid and combinations of rigid and nonrigid registration schemes are evaluated, utilizi...

    journal_title:Medical physics

    pub_type: 杂志文章

    doi:10.1118/1.4923170

    authors: Vlachopoulos G,Korfiatis P,Skiadopoulos S,Kazantzi A,Kalogeropoulou C,Pratikakis I,Costaridou L

    更新日期:2015-08-01 00:00:00

  • Stereomammography: evaluation of depth perception using a virtual 3D cursor.

    abstract::We are evaluating the usefulness of stereomammography in improving breast cancer diagnosis. One area that we are investigating is whether the improved depth perception associated with stereomammography might be significantly enhanced with the use of a virtual 3D cursor. A study was performed to evaluate the accuracy o...

    journal_title:Medical physics

    pub_type: 杂志文章

    doi:10.1118/1.599008

    authors: Goodsitt MM,Chan HP,Hadjiiski L

    更新日期:2000-06-01 00:00:00

  • Development of a novel high quantum efficiency MV x-ray detector for image-guided radiotherapy: A feasibility study.

    abstract:PURPOSE:To develop a new scintillating fiber-based electronic portal imaging device (EPID) with a high quantum efficiency (QE) while preserving an adequate spatial resolution. METHODS:Two prototypes were built: one with a single pixel readout and the other with an active matrix flat-panel imager (AMFPI) for readout. T...

    journal_title:Medical physics

    pub_type: 杂志文章

    doi:10.1002/mp.13900

    authors: Liu J,Xu Y,Teymurazyan A,Papandreou Z,Pang G

    更新日期:2020-01-01 00:00:00

  • On the suitability of ultrathin detectors for absorbed dose assessment in the presence of high-density heterogeneities.

    abstract:PURPOSE:The aim of this study was to evaluate the suitability of several detectors for the determination of absorbed dose in bone. METHODS:Three types of ultrathin LiF-based thermoluminescent dosimeters (TLDs)-two LiF:Mg,Cu,P-based (MCP-Ns and TLD-2000F) and a (7)Li-enriched LiF:Mg,Ti-based (MTS-7s)-as well as EBT2 Ga...

    journal_title:Medical physics

    pub_type: 杂志文章

    doi:10.1118/1.4886760

    authors: Bueno M,Carrasco P,Jornet N,Muñoz-Montplet C,Duch MA

    更新日期:2014-08-01 00:00:00

  • SU-E-T-144: Daily and Monthly Quality Assurance with TomoDose.

    abstract:PURPOSE:Examine the use of TomoDose for Tomotherapy quality assurance. METHODS:Baseline TomoDose profiles are acquired annually in accordance with TG-148. During monthly quality assurance, TomoDose is irradiated with a static beam and referenced to baseline. Differences between superimposed profiles are evaluated mont...

    journal_title:Medical physics

    pub_type: 杂志文章

    doi:10.1118/1.4735202

    authors: Terrell J

    更新日期:2012-06-01 00:00:00

  • On the assay of brachytherapy sources.

    abstract::In many of brachytherapy procedures, a large amount of radioactive sources are used to deliver desired doses to the target volume. It is both the federal regulation recommendation (U.S. Nuclear Regulatory Commission, 10 CFR 35.432) and recommendations of the American Association of Physicists in Medicine (AAPM) [Kutch...

    journal_title:Medical physics

    pub_type: 杂志文章

    doi:10.1118/1.2734723

    authors: Yue NJ,Haffty BG,Yue J

    更新日期:2007-06-01 00:00:00

  • Experimental evaluation of the dosimetric impact of intrafraction prostate rotation using film measurement with a 6DoF robotic arm.

    abstract:PURPOSE:Tumor motion during radiotherapy can cause a reduction in target dose coverage and an increase in healthy tissue exposure. Tumor motion is not strictly translational and often exhibits complex six degree-of-freedom (6DoF) translational and rotational motion. Although the dosimetric impact of prostate tumor tran...

    journal_title:Medical physics

    pub_type: 杂志文章

    doi:10.1002/mp.14502

    authors: Shi K,Dipuglia A,Booth J,Alnaghy S,Kyme A,Keall P,Nguyen DT

    更新日期:2020-12-01 00:00:00

  • Sci-Sat AM(1): Imaging-04: Respiratory errors in cardiac PET/CT with manual alignment of the CT image.

    abstract::Respiratory motion can produce misregistration errors between CT and PET images in cardiac PET/CT imaging. The objective of this study was to determine if manual registration of a single-phase end-expiration CT scan to the PET image would eliminate respiratory-induced artifacts. Listmode data from 71 cardiac PET patie...

    journal_title:Medical physics

    pub_type: 杂志文章

    doi:10.1118/1.2965988

    authors: Wells RG

    更新日期:2008-07-01 00:00:00

  • Transient noise characterization and filtration in CCD cameras exposed to stray radiation from a medical linear accelerator.

    abstract::Charge coupled devices (CCDs) are being increasingly used in radiation therapy for dosimetric purposes. However, CCDs are sensitive to stray radiation. This effect induces transient noise. Radiation-induced noise strongly alters the image and therefore limits its quantitative analysis. The purpose of this work is to c...

    journal_title:Medical physics

    pub_type: 杂志文章

    doi:10.1118/1.2975147

    authors: Archambault L,Briere TM,Beddar S

    更新日期:2008-10-01 00:00:00

  • Performance characteristics of transmission imaging using a uniform sheet source with parallel-hole collimation.

    abstract::Transmission imaging is receiving increasing attention in SPECT due to the need to compensate for nonuniform attenuation in cardiac-chest SPECT. The quality of a transmission image has an important effect on the measured attenuation distribution. To improve image quality, knowledge of the performance characteristics o...

    journal_title:Medical physics

    pub_type: 杂志文章

    doi:10.1118/1.596752

    authors: Cao Z,Tsui BM

    更新日期:1992-09-01 00:00:00

  • Computerized characterization of masses on mammograms: the rubber band straightening transform and texture analysis.

    abstract::A new rubber band straightening transform (RBST) is introduced for characterization of mammographic masses as malignant or benign. The RBST transforms a band of pixels surrounding a segmented mass onto the Cartesian plane (the RBST image). The border of a mammographic mass appears approximately as a horizontal line, a...

    journal_title:Medical physics

    pub_type: 杂志文章

    doi:10.1118/1.598228

    authors: Sahiner B,Chan HP,Petrick N,Helvie MA,Goodsitt MM

    更新日期:1998-04-01 00:00:00

  • A clinically feasible method for the detection of potential collision in proton therapy.

    abstract:PURPOSE:Potential collision between the patient∕couch and the gantry could delay the start of the treatment and reduce clinical efficiency. The ability to accurately detect possible collisions during the treatment planning phase is desired. Such collision detection should account for the specific proton gantry design, ...

    journal_title:Medical physics

    pub_type: 杂志文章

    doi:10.1118/1.4760988

    authors: Zou W,Lin H,Plastaras JP,Wang H,Bui V,Vapiwala N,McDonough J,Tochner Z,Both S

    更新日期:2012-11-01 00:00:00

  • An adaptive probabilistic atlas for anomalous brain segmentation in MR images.

    abstract:PURPOSE:Automated segmentation of brain structures (objects) in MR three-dimensional (3D) images for quantitative analysis has been a challenge and probabilistic atlases (PAs) are among the most well-succeeded approaches. However, the existing models do not adapt to possible object anomalies due to the presence of a di...

    journal_title:Medical physics

    pub_type: 杂志文章

    doi:10.1002/mp.13771

    authors: Martins SB,Bragantini J,Falcão AX,Yasuda CL

    更新日期:2019-11-01 00:00:00

  • A residual correction method for high-resolution PET reconstruction with application to on-the-fly Monte Carlo based model of positron range.

    abstract:PURPOSE:The quality of tomographic images is directly affected by the system model being used in image reconstruction. An accurate system matrix is desirable for high-resolution image reconstruction, but it often leads to high computation cost. In this work the authors present a maximum a posteriori reconstruction algo...

    journal_title:Medical physics

    pub_type: 杂志文章

    doi:10.1118/1.3284980

    authors: Fu L,Qi J

    更新日期:2010-02-01 00:00:00

  • Verification of absorbed dose determined with plane-parallel chambers in clinical electron beams following AAPM Task Group 39 protocol using ferrous sulphate dosimetry.

    abstract::The absorbed dose values determined with the Exradin and PTW-Markus plane-parallel chambers were compared to the values obtained with the ferrous sulphate dosimetry for a number of the Philips SL25 and the Therac 20 electron beams. For the plane-parallel chambers, the cavity-gas calibration factor Ngaspp, was derived ...

    journal_title:Medical physics

    pub_type: 杂志文章

    doi:10.1118/1.597800

    authors: Xu Z,Li H,Almond PR,Guan TY

    更新日期:1996-03-01 00:00:00

  • A method to estimate transmission profiles of bow-tie filters using rotating tube measurements.

    abstract:PURPOSE:The purpose of this paper was to present a method of determining the dose profile of the beam bow-tie filter (BTF) without the need for fixing the x ray tube in a position or using special instruments or dosimeters other than the ordinary types of ion chambers used for CT dosimetry (e.g., Farmer chamber). METH...

    journal_title:Medical physics

    pub_type: 杂志文章

    doi:10.1002/mp.13203

    authors: Al-Senan R

    更新日期:2018-11-01 00:00:00

  • Technical Note: Identification of an optimal electromagnetic sensor for in vivo electromagnetic-tracked scintillation dosimeter for HDR brachytherapy.

    abstract:PURPOSE:Brachytherapy is a treatment modality which delivers large doses of radiation in a reduced number of visits. Since a small number of large dose-per-fraction is administered in high dose rate brachytherapy, ensuring the right dose is delivered is highly critical. In this work, a scintillation detector is coupled...

    journal_title:Medical physics

    pub_type: 杂志文章

    doi:10.1002/mp.13508

    authors: Tho D,Beaulieu L

    更新日期:2019-05-01 00:00:00

  • Potential use of P-32 ophthalmic applicator: Monte Carlo simulations for design and dosimetry.

    abstract::Postoperative beta-irradiation after pterygium excision has been considered a valuable therapeutic procedure to reduce the recurrence rate. Recently, it was reported that beta-irradiation also substantially reduced the risk of surgical failure after glaucoma surgery. Pure beta-irradiation using a 90Sr/Y applicator has...

    journal_title:Medical physics

    pub_type: 杂志文章

    doi:10.1118/1.2896076

    authors: Park YK,Ye SJ,Kim IH,Wee WR,Kim MK,Han HS,Son KJ,Park UJ

    更新日期:2008-05-01 00:00:00

  • Technical Note: Evaluation of a 160-mm/256-row CT scanner for whole-heart quantitative myocardial perfusion imaging.

    abstract:PURPOSE:The authors investigated the performance of a recently introduced 160-mm/256-row CT system for low dose quantitative myocardial perfusion (MP) imaging of the whole heart. This platform is equipped with a gantry capable of rotating at 280 ms per full cycle, a second generation of adaptive statistical iterative r...

    journal_title:Medical physics

    pub_type: 杂志文章

    doi:10.1118/1.4957389

    authors: So A,Imai Y,Nett B,Jackson J,Nett L,Hsieh J,Wisenberg G,Teefy P,Yadegari A,Islam A,Lee TY

    更新日期:2016-08-01 00:00:00

  • A consistent set of neutron kerma coefficients from thermal to 150 MeV for biologically important materials.

    abstract::Neutron cross sections for nonelastic and elastic reactions on a range of elements have been evaluated for incident energies up to 150 MeV. These cross sections agree well with experimental cross section data for charged-particle production as well as neutron and photon production. Therefore they can be used to determ...

    journal_title:Medical physics

    pub_type: 杂志文章

    doi:10.1118/1.598601

    authors: Chadwick MB,Barschall HH,Caswell RS,DeLuca PM,Hale GM,Jones DT,MacFarlane RE,Meulders JP,Schuhmacher H,Schrewe UJ,Wambersie A,Young PG

    更新日期:1999-06-01 00:00:00

  • A generic TG-186 shielded applicator for commissioning model-based dose calculation algorithms for high-dose-rate 192 Ir brachytherapy.

    abstract:PURPOSE:A joint working group was created by the American Association of Physicists in Medicine (AAPM), the European Society for Radiotherapy and Oncology (ESTRO), and the Australasian Brachytherapy Group (ABG) with the charge, among others, to develop a set of well-defined test case plans and perform calculations and ...

    journal_title:Medical physics

    pub_type: 杂志文章

    doi:10.1002/mp.12459

    authors: Ma Y,Vijande J,Ballester F,Tedgren ÅC,Granero D,Haworth A,Mourtada F,Fonseca GP,Zourari K,Papagiannis P,Rivard MJ,Siebert FA,Sloboda RS,Smith R,Chamberland MJP,Thomson RM,Verhaegen F,Beaulieu L

    更新日期:2017-11-01 00:00:00

  • A moving blocker system for cone-beam computed tomography scatter correction.

    abstract:PURPOSE:Scatter contamination in cone-beam computed tomography (CBCT) degrades the image quality by introducing shading artifacts. A moving-blocker-based approach has been proposed to simultaneously estimate scatter and reconstruct the complete volume within field of view (FOV) from a single CBCT scan. Promising result...

    journal_title:Medical physics

    pub_type: 杂志文章

    doi:10.1118/1.4811086

    authors: Ouyang L,Song K,Wang J

    更新日期:2013-07-01 00:00:00

  • Prevention of a wrong-location misadministration through the use of an intradepartmental incident learning system.

    abstract:PURPOSE:A series of examples are presented in which potential errors in the delivery of radiation therapy were prevented through use of incident learning. These examples underscore the value of reporting near miss incidents. METHODS:Using a departmental incident learning system, eight incidents were noted over a two-y...

    journal_title:Medical physics

    pub_type: 杂志文章

    doi:10.1118/1.4760774

    authors: Ford EC,Smith K,Harris K,Terezakis S

    更新日期:2012-11-01 00:00:00

  • Cascaded systems analysis of the 3D noise transfer characteristics of flat-panel cone-beam CT.

    abstract::The physical factors that govern 2D and 3D imaging performance may be understood from quantitative analysis of the spatial-frequency-dependent signal and noise transfer characteristics [e.g., modulation transfer function (MTF), noise-power spectrum (NPS), detective quantum efficiency (DQE), and noise-equivalent quanta...

    journal_title:Medical physics

    pub_type: 杂志文章

    doi:10.1118/1.3002414

    authors: Tward DJ,Siewerdsen JH

    更新日期:2008-12-01 00:00:00

  • A new framework of image reconstruction from fan beam projections.

    abstract::In this paper, we present a unified framework to reconstruct images for both fan beam and cone beam projections. The important feature of our theoretical framework is that it does not depend on the classical concept of the Radon transform at all. This property allows us to directly generalize the ideas and techniques ...

    journal_title:Medical physics

    pub_type: 杂志文章

    doi:10.1118/1.1577252

    authors: Chen GH

    更新日期:2003-06-01 00:00:00

  • Clinical evaluation of a commercial orthopedic metal artifact reduction tool for CT simulations in radiation therapy.

    abstract:PURPOSE:Severe artifacts in kilovoltage-CT simulation images caused by large metallic implants can significantly degrade the conspicuity and apparent CT Hounsfield number of targets and anatomic structures, jeopardize the confidence of anatomical segmentation, and introduce inaccuracies into the radiation therapy treat...

    journal_title:Medical physics

    pub_type: 杂志文章

    doi:10.1118/1.4762814

    authors: Li H,Noel C,Chen H,Harold Li H,Low D,Moore K,Klahr P,Michalski J,Gay HA,Thorstad W,Mutic S

    更新日期:2012-12-01 00:00:00

  • Feasibility of estimating regional mechanical properties of cerebral aneurysms in vivo.

    abstract:PURPOSE:In this article, the authors studied the feasibility of estimating regional mechanical properties in cerebral aneurysms, integrating information extracted from imaging and physiological data with generic computational models of the arterial wall behavior. METHODS:A data assimilation framework was developed to ...

    journal_title:Medical physics

    pub_type: 杂志文章

    doi:10.1118/1.3355933

    authors: Balocco S,Camara O,Vivas E,Sola T,Guimaraens L,Gratama van Andel HA,Majoie CB,Pozo JM,Bijnens BH,Frangi AF

    更新日期:2010-04-01 00:00:00

  • Computational analysis and dosimetric evaluation of a commercial irregular-fields computer program.

    abstract::The proper evaluation of the accuracy of a new computer program for radiation-therapy dosimetry requires consideration of both the mathematical algorithm used in the program and the performance required in clinical applications. As an example, our evaluation of the irregular-fields dosimetry program currently marketed...

    journal_title:Medical physics

    pub_type: 杂志文章

    doi:10.1118/1.594344

    authors: Hallberg JR,Ibbott GS,Carson PL,Hendee WR

    更新日期:1977-11-01 00:00:00

  • The effect of dose calculation uncertainty on the evaluation of radiotherapy plans.

    abstract::Monte Carlo dose calculations will potentially reduce systematic errors that may be present in currently used dose calculation algorithms. However, Monte Carlo calculations inherently contain random errors, or statistical uncertainty, the level of which decreases inversely with the square root of computation time. Our...

    journal_title:Medical physics

    pub_type: 杂志文章

    doi:10.1118/1.598916

    authors: Keall PJ,Siebers JV,Jeraj R,Mohan R

    更新日期:2000-03-01 00:00:00