Abstract：
:The validity of conclusions drawn from multi-institutional radiotherapy studies is dependent upon the degree to which participating hospitals adhere to study requirements. A major effort undertaken by the Quality Assurance Review Center (QARC) assesses whether or not patient data which are deemed evaluable actually conform to the radiotherapy requirements of the research protocol. This paper presents the methods and results of this effort which has been ongoing for the past five years. The Dosimetry Review System (DRS) is a set of computer programs which make use of verified radiation beam data to evaluate the daily dose, total dose, dose uniformity, and TDF for protocol treatment. These programs can be adapted to facilitate and document the routine chart-checking procedures at any large radiotherapy department. The DRS data base includes radiotherapy parameters of 600 teletherapy units at more than 250 institutions in the United States and abroad. The design of the data base, the computerized review process, and the calculational algorithms are discussed.
journal_name
Med Physjournal_title
Medical physicsauthors
Reinstein LE,McShan D,Glicksman ASdoi
10.1118/1.595221subject
Has Abstractpub_date
1982-03-01 00:00:00pages
240-9issue
2eissn
0094-2405issn
2473-4209journal_volume
9pub_type
杂志文章相关文献
MEDICAL PHYSICS文献大全abstract：:A computer dose model for a low energy gamma-emitting stent in a heterogeneous medium is described. The method is based on the Sievert model which is adapted to the dose-point-kernel (DPK) model to compute the dose distribution about filtered gamma sources (Sievert-DPK model). The new gamma stent model can take into a...
journal_title：Medical physics
pub_type： 杂志文章
doi：10.1118/1.1380214
更新日期：2001-07-01 00:00:00
abstract：:A new high-resolution detector has been developed for use in a slot-scanned digital mammography system. The detector is a hybrid device that consists of a CCD operating in time-delay integration mode that is bonded to a 150-microm-thick CdZnTe photoconductor array. The CCD was designed with a detector element pitch of...
journal_title：Medical physics
pub_type： 杂志文章
doi：10.1118/1.1523932
更新日期：2002-12-01 00:00:00
abstract：:We studied a recently proposed aggregated CT reconstruction technique which combines the complementary advantages of kilovoltage (kV) and megavoltage (MV) x-ray imaging. Various phantoms were imaged to study the effects of beam orientations and geometry of the imaging object on image quality of reconstructed CT. It wa...
journal_title：Medical physics
pub_type： 杂志文章
doi：10.1118/1.2768862
更新日期：2007-09-01 00:00:00
abstract：PURPOSE:In a recent paper by Bouchard et al. [Med. Phys. 36(10), 4654-4663 (2009)], a theoretical model of quality correction factors for idealistic so-called plan-class specific reference (PCSR) fields was proposed. The reasoning was founded on the definition of PCSR fields made earlier by Alfonso et al. [Med. Phys. 3...
journal_title：Medical physics
pub_type： 杂志文章
doi：10.1118/1.3684952
更新日期：2012-03-01 00:00:00
abstract：PURPOSE:Motion compensated positron emission tomography (PET) imaging requires detecting and monitoring of patient body motion. We developed a semiautomatic list-mode method to track the three-dimensional (3D) motion of fiducial positron-emitting markers during PET imaging. METHODS:A previously developed motion tracki...
journal_title：Medical physics
pub_type： 杂志文章
doi：10.1002/mp.14206
更新日期：2020-08-01 00:00:00
abstract：PURPOSE:Anomalous pixels may be defined as those pixels whose exposure response relationship is deviant from the typical, expected or calibrated response. A group of anomalous pixels may Result in visible correlated artifacts. Here we demonstrate an approach to identify anomalous pixels and correlated artifacts using f...
journal_title：Medical physics
pub_type： 杂志文章
doi：10.1118/1.4734820
更新日期：2012-06-01 00:00:00
abstract：:A scintillation dosemeter is calibrated for 90Sr/90Y beta rays from an ophthalmic applicator, using an extrapolation ionization chamber as a reference instrument. The calibration factor for the scintillation dosemeter agrees with that given by the manufacturer of the dosemeter within ca. 2%. The estimated overall unce...
journal_title：Medical physics
pub_type： 杂志文章
doi：10.1118/1.1709490
更新日期：2004-05-01 00:00:00
abstract：PURPOSE:In this study, a dedicated device for ion chamber measurements of absorbed dose-to-water for a Nucletron microSelectron-v2 HDR (192)Ir brachytherapy source is presented. The device uses two ionization chambers in a so-called sandwich assembly. Using this setup and by taking the average reading of the two chambe...
journal_title：Medical physics
pub_type： 杂志文章
doi：10.1118/1.4816673
更新日期：2013-09-01 00:00:00
abstract：PURPOSE:This article presents an iterative method for compensation of motion artifacts for slowly rotating computed tomography (CT) systems. Patient's motion introduces inconsistencies among projections and yields severe reconstruction artifacts for free-breathing acquisitions. Streaks and doubling of structures can ap...
journal_title：Medical physics
pub_type： 杂志文章
doi：10.1118/1.3244035
更新日期：2009-11-01 00:00:00
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
更新日期：2002-09-01 00:00:00
abstract：:Fluoroscopy is a low dose imaging technique. As such, a very sensitive detector is required to create images of good quality. Present day flat panel active matrix read out systems introduce an amount of noise that inhibits present direct and indirect methods from producing optimal quality images at fluoroscopic exposu...
journal_title：Medical physics
pub_type： 杂志文章
doi：10.1118/1.1513157
更新日期：2002-11-01 00:00:00
abstract：PURPOSE:Prostate cancer ranks as one of the most common malignancies and currently represents the second leading cancer-specific cause of death in men. The current use of single modality transrectal ultrasound (TRUS) for biopsy guidance has a limited sensitivity and specificity for accurately identifying cancerous lesi...
journal_title：Medical physics
pub_type： 杂志文章
doi：10.1118/1.4803498
更新日期：2013-06-01 00:00:00
abstract：:Various techniques have been developed to localize radioactive sources in brachytherapy implants. The most common methods include the orthogonal film method, the stereo-shift film method, and recently, direct localization from a series of contiguous CT transverse images. The major advantage of the CT method is that it...
journal_title：Medical physics
pub_type： 杂志文章
doi：10.1118/1.598548
更新日期：1999-04-01 00:00:00
abstract：PURPOSE:Pulmonary magnetic-resonance-imaging (MRI) and x-ray computed-tomography have provided strong evidence of spatially and temporally persistent lung structure-function abnormalities in asthmatics. This has generated a shift in their understanding of lung disease and supports the use of imaging biomarkers as inter...
journal_title：Medical physics
pub_type： 杂志文章
doi：10.1118/1.4948999
更新日期：2016-06-01 00:00:00
abstract：:The photon spectra in vacuum around four types of 192Ir HDR brachytherapy sources are calculated using the Monte Carlo code EGS4 and the most recent spectral information on 192Ir decay. The air-kerma strengths per unit activity are calculated based on the photon fluence around a bare 192Ir source and around each of fo...
journal_title：Medical physics
pub_type： 杂志文章
doi：10.1118/1.598763
更新日期：1999-11-01 00:00:00
abstract：PURPOSE:The purpose of this study is to investigate the feasibility of increasing the system spatial resolution and scanning speed of Hologic Selenia Dimensions digital breast tomosynthesis (DBT) scanner by replacing the rotating mammography x-ray tube with a specially designed carbon nanotube (CNT) x-ray source array,...
journal_title：Medical physics
pub_type： 杂志文章
doi：10.1118/1.3694667
更新日期：2012-04-01 00:00:00
abstract：:An algorithmic solution to the biological effective dose (BED) calculation from the Lea-Catcheside formula for a piecewise defined function is presented. Data from patients treated for metastatic thyroid cancer were used to illustrate the solution. The Lea-Catcheside formula for the G-factor of the BED is integrated n...
journal_title：Medical physics
pub_type： 杂志文章
doi：10.1118/1.3070587
更新日期：2009-03-01 00:00:00
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
更新日期：1985-01-01 00:00:00
abstract：:High false-positive (FP) rate remains to be one of the major problems to be solved in CAD study because too many false-positively cued signals will potentially degrade the performance of detecting true-positive regions and increase the call-back rate in CAD environment. In this paper, we proposed a novel classificatio...
journal_title：Medical physics
pub_type： 杂志文章
doi：10.1118/1.1344203
更新日期：2001-02-01 00:00:00
abstract：PURPOSE:A 3-year project called LABSYNC has been recently funded by the European Commission, with the aim of designing a radiation facility based on a compact light source, i.e., a laboratory-sized commercial synchrotron, capable of accelerating electrons up to 6 or 20 MeV. An accurate spectral description of hard x ra...
journal_title：Medical physics
pub_type： 杂志文章
doi：10.1118/1.3223357
更新日期：2009-10-01 00:00:00
abstract：PURPOSE:Manual delineation of head and neck (H&N) organ-at-risk (OAR) structures for radiation therapy planning is time consuming and highly variable. Therefore, we developed a dynamic multiatlas selection-based approach for fast and reproducible segmentation. METHODS:Our approach dynamically selects and weights the a...
journal_title：Medical physics
pub_type： 杂志文章
doi：10.1002/mp.13854
更新日期：2019-12-01 00:00:00
abstract：PURPOSE:This work introduces a rigid registration framework for patient positioning in radiotherapy, based on real-time surface acquisition by a time-of-flight (ToF) camera. Dynamic properties of the system are also investigated for future gating/tracking strategies. METHODS:A novel preregistration algorithm, based on...
journal_title：Medical physics
pub_type： 杂志文章
doi：10.1118/1.3664006
更新日期：2012-01-01 00:00:00
abstract：PURPOSE:Developed herein is a three-dimensional (3D) flow contrast imaging system leveraging advancements in the extension of laser speckle contrast imaging theories to deep tissues along with our recently developed finite-element diffuse correlation tomography (DCT) reconstruction scheme. This technique, termed speckl...
journal_title：Medical physics
pub_type： 杂志文章
doi：10.1118/1.4922206
更新日期：2015-07-01 00:00:00
abstract：:Francis Bacon, who with Rene Decartes laid the intellectual foundations for Western science in the seventeenth century, asserted that the purpose of all knowledge is "action in the production of works for ... the relief of man's estate." We assess briefly several aspects of a few of the current efforts directed to the...
journal_title：Medical physics
pub_type： 杂志文章
doi：10.1118/1.1555493
更新日期：2003-04-01 00:00:00
abstract：:The purpose of this study is to incorporate the dosimetric effect of random patient positioning uncertainties directly into a commercial treatment planning system's IMRT plan optimization algorithm through probabilistic treatment planning (PTP) and compare coverage of this method with margin-based planning. In this wo...
journal_title：Medical physics
pub_type： 杂志文章
doi：10.1118/1.3176940
更新日期：2009-09-01 00:00:00
abstract：PURPOSE:Efficacy of tuberculosis (TB) treatment is often monitored using chest radiography. Monitoring size of cavities in pulmonary tuberculosis is important as the size predicts severity of the disease and its persistence under therapy predicts relapse. The authors present a method for automatic cavity segmentation i...
journal_title：Medical physics
pub_type： 杂志文章
doi：10.1118/1.4881096
更新日期：2014-07-01 00:00:00
abstract：:In a practical classifier design problem, the true population is generally unknown and the available sample is finite-sized. A common approach is to use a resampling technique to estimate the performance of the classifier that will be trained with the available sample. We conducted a Monte Carlo simulation study to co...
journal_title：Medical physics
pub_type： 杂志文章
doi：10.1118/1.2868757
更新日期：2008-04-01 00:00:00
abstract：PURPOSE:Given its sensitivity to anatomical variations, proton therapy is expected to benefit greatly from integration with magnetic resonance imaging for online anatomy monitoring during irradiation. Such an integration raises several challenges, as both systems mutually interact. The proton beam will experience quasi...
journal_title：Medical physics
pub_type： 杂志文章
doi：10.1002/mp.12961
更新日期：2018-07-01 00:00:00
abstract：PURPOSE:There is interest in developing linac-MR systems for MRI-guided radiation therapy. To date, the designs for such linac-MR devices have been restricted to a transverse geometry where the static magnetic field is oriented perpendicular to the direction of the incident photon beam. This work extends possibilities ...
journal_title：Medical physics
pub_type： 杂志文章
doi：10.1118/1.3475942
更新日期：2010-09-01 00:00:00
abstract：PURPOSE:To describe Acuros® CTS, a new software tool for rapidly and accurately estimating scatter in x-ray projection images by deterministically solving the linear Boltzmann transport equation (LBTE). METHODS:The LBTE describes the behavior of particles as they interact with an object across spatial, energy, and dir...
journal_title：Medical physics
pub_type： 杂志文章
doi：10.1002/mp.12850
更新日期：2018-05-01 00:00:00
