Abstract：
PURPOSE:Recent guidance by The Joint Commission and CRCPD recommendations require establishing CT reference dose levels (RDLs) for clinical protocols and recording CT dose metrics in the patient's medical record. This presentation addresses which dose values in the CT report should be recorded for the purposes of monitoring patient dose and determining RDLs effectively. METHODS:CT dose reports are commonly recorded in the PACS as screen captures, although structured reporting is becoming available on current CT scanners and PACS systems. The goal is to obtain data that correctly reflects the patient's dose, but the dose information captured is not standardized across vendors and can be difficult to compare. Multi-phase studies, deviations from established protocols and dynamic scanning present problems when recording numbers to establish RDLs because of the lack of information on the anatomy scanned. The cumulative DLP and CTDIvol manually entered by radiologic technologists into the electronic medical record were compared with more detailed dose metrics compiled from PACS images. RESULTS:Analysis of this data showed that simple cumulative metrics are a poor indicator of patient dose. Major problems are 1) the inclusion of dynamic scan doses associated with bolus tracking, which can skew protocol CTDIvol values by a factor of up to 20, and 2) add-on scans of non-overlapping anatomy which can inaccurately increase apparent patient dose. CONCLUSIONS:Recording CTDIvol to monitor patient doses is not straightforward, since details of the actual anatomy scanned are lacking without image-based review. More granular dose reporting which identifies individual acquisitions is required; however, current RIS systems do not provide the flexibility necessary to capture all this information.
journal_name
Med Physjournal_title
Medical physicsauthors
Guild J,Arbique G,Blackburn T,Gallet J,Anderson Jdoi
10.1118/1.4734773subject
Has Abstractpub_date
2012-06-01 00:00:00pages
3637-3638issue
6Part4eissn
0094-2405issn
2473-4209journal_volume
39pub_type
杂志文章相关文献
MEDICAL PHYSICS文献大全abstract：:A Monte Carlo method was developed and implemented to simulate x-ray photon transport. Simulations consisted of a pencil beam of monoenergetic photons with energies from 50 to 110 keV incident on water and aluminum slabs. The dependence of scatter fraction and multiple scattering on x-ray energy, scatterer thickness, ...
journal_title：Medical physics
pub_type： 杂志文章
doi：10.1118/1.596268
更新日期：1988-11-01 00:00:00
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
更新日期：2005-08-01 00:00:00
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
更新日期：2016-08-01 00:00:00
abstract：:The Radiological Physics Center (RPC) developed two heterogeneous anthropomorphic quality assurance phantoms for use in verifying the accuracy of radiation delivery: one for intensity-modulated radiation therapy (IMRT) to the pelvis and the other for stereotactic body radiation therapy (SBRT) to the thorax. The purpos...
journal_title：Medical physics
pub_type： 杂志文章
doi：10.1118/1.2737158
更新日期：2007-06-01 00:00:00
abstract：PURPOSE:To develop a new biological equivalent dose (BED) formulism that includes repair, repopulation and resensitization (redistribution and reoxygenation), and can be used to calculate prescribed dose for permanent implant with Cs-131. METHODS:Because of lack of sufficient clinical data, the prescribed dose with ne...
journal_title：Medical physics
pub_type： 杂志文章
doi：10.1118/1.4735551
更新日期：2012-06-01 00:00:00
abstract：PURPOSE:Couch and MLC tracking are two promising methods for real-time motion compensation during radiation therapy. So far, couch and MLC tracking experiments have mainly been performed by different research groups, and no direct comparison of couch and MLC tracking of volumetric modulated arc therapy (VMAT) plans has...
journal_title：Medical physics
pub_type： 杂志文章
doi：10.1118/1.4946815
更新日期：2016-05-01 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：PURPOSE:Flattening filters (FFs) have been considered as an integral part of the treatment head of a medical accelerator for more than 50 years. The reasons for the longstanding use are, however, historical ones. Advanced treatment techniques, such as stereotactic radiotherapy or intensity modulated radiotherapy have s...
journal_title：Medical physics
pub_type： 杂志文章,评审
doi：10.1118/1.3554643
更新日期：2011-03-01 00:00:00
abstract：:The performance of an indirect-detection, active matrix flat-panel imager (FPI) at diagnostic energies is reported in terms of measured and theoretical signal size, noise power spectrum (NPS), and detective quantum efficiency (DQE). Based upon a 1536 x 1920 pixel, 127 microns pitch array of a-Si:H thin-film transistor...
journal_title：Medical physics
pub_type： 杂志文章
doi：10.1118/1.598243
更新日期：1998-05-01 00:00:00
abstract：:Approximately 70-85% of breast biopsies are performed on benign lesions. To reduce this high number of biopsies performed on benign lesions, a case-based reasoning (CBR) classifier was developed to predict biopsy results from BI-RADS findings. We used 1433 (931 benign) biopsy-proven mammographic cases. CBR similarity ...
journal_title：Medical physics
pub_type： 杂志文章
doi：10.1118/1.1501140
更新日期：2002-09-01 00:00:00
abstract：PURPOSE:To formulate convex planning objectives of treatment plan multicriteria optimization with explicit relationships to the dose-volume histogram (DVH) statistics used in plan quality evaluation. METHODS:Conventional planning objectives are designed to minimize the violation of DVH statistics thresholds using pena...
journal_title：Medical physics
pub_type： 杂志文章
doi：10.1002/mp.12146
更新日期：2017-06-01 00:00:00
abstract：:We discuss a formalism for clinical proton beam dosimetry based on the use of ionization chamber absorbed dose-to-water calibration and beam quality correction factors. A quantity kQ, the beam quality correction factor, is defined which corrects the absorbed dose-to-water calibration factor ND,w in a reference beam of...
journal_title：Medical physics
pub_type： 杂志文章
doi：10.1118/1.597768
更新日期：1996-01-01 00:00:00
abstract：PURPOSE:To develop a pencil beam dose calculation algorithm for scanned proton beams that improves modeling of scatter events. METHODS:Our pencil beam algorithm (PBA) was developed for calculating dose from monoenergetic, parallel proton beams in homogeneous media. Fermi-Eyges theory was implemented for pencil beam tr...
journal_title：Medical physics
pub_type： 杂志文章
doi：10.1118/1.4735624
更新日期：2012-06-01 00:00:00
abstract：PURPOSE:To quantify detector perturbation effects in megavoltage small photon fields and support the theoretical explanation on the nature of quality correction factors in these conditions. METHODS:In this second paper, a modern approach to radiation dosimetry is defined for any detector and applied to small photon fi...
journal_title：Medical physics
pub_type： 杂志文章
doi：10.1118/1.4930798
更新日期：2015-10-01 00:00:00
abstract：:A detailed Monte Carlo study of the PTW-diamond solid state detector response in megavoltage photon beams (60Co gamma rays to 25 MV x rays) has been performed with the EGS4 Monte Carlo Code. The sensitive volume of the diamond detector is a disk of diameter 4.4 mm and thickness 0.40 mm. The phantom material was water ...
journal_title：Medical physics
pub_type： 杂志文章
doi：10.1118/1.598771
更新日期：1999-11-01 00:00:00
abstract：:A fast, geometric beam angle optimization (BAO) algorithm for clinical intensity-modulated radiation therapy (IMRT) was implemented on ten localized prostate cancer patients on the Radiation Therapy Oncology Group (RTOG) 0126 protocol. The BAO algorithm computed the beam intersection volume (BIV) within the rectum and...
journal_title：Medical physics
pub_type： 杂志文章
doi：10.1118/1.2775685
更新日期：2007-10-01 00:00:00
abstract：:Digital tomosynthesis (DTS) is a fast, low-dose three-dimensional (3D) imaging approach which yields slice images with excellent in-plane resolution, though low plane-to-plane resolution. A stack of DTS slices can be reconstructed from a single limited-angle scan, with typical scan angles ranging from 10 degrees to 40...
journal_title：Medical physics
pub_type： 杂志文章
doi：10.1118/1.2756941
更新日期：2007-08-01 00:00:00
abstract：:Recently, new imaging modalities based on the detection of weak phase perturbations effects, among which are phase contrast and diffraction imaging, have been developed by several researchers. Due to their high sensitivity to weakly absorbing details, these techniques seem to be very promising for applications in the ...
journal_title：Medical physics
pub_type： 杂志文章
doi：10.1118/1.1388219
更新日期：2001-08-01 00:00:00
abstract：PURPOSE:Anatomical variations occur during head and neck (H&N) radiotherapy treatment. kV cone-beam computed tomography (CBCT) images can be used for daily dose monitoring to assess dose variations owing to anatomic changes. Deep learning methods (DLMs) have recently been proposed to generate pseudo-CT (pCT) from CBCT ...
journal_title：Medical physics
pub_type： 杂志文章
doi：10.1002/mp.14387
更新日期：2020-10-01 00:00:00
abstract：PURPOSE:Accurate segmentation of lungs with severe interstitial lung disease (ILD) in thoracic computed tomography (CT) is an important and difficult task in the development of computer-aided diagnosis (CAD) systems. Therefore, we developed in this study a texture analysis-based method for accurate segmentation of lung...
journal_title：Medical physics
pub_type： 杂志文章
doi：10.1118/1.3222872
更新日期：2009-10-01 00:00:00
abstract：:Dose calculations for treatment planning of photon beam radiotherapy require a model of the beam to drive the dose calculation models. The beam shaping process involves scattering and filtering that yield radiation components which vary with collimator settings. The necessity to model these components has motivated th...
journal_title：Medical physics
pub_type： 杂志文章
doi：10.1118/1.1898485
更新日期：2005-06-01 00:00:00
abstract：PURPOSE:Image guidance is crucial for percutaneous tumor ablations, enabling accurate needle-like applicator placement into target tumors while avoiding tissues that are sensitive to injury and/or correcting needle deflection. Although ultrasound (US) is widely used for image guidance, magnetic resonance (MR) is prefer...
journal_title：Medical physics
pub_type： 杂志文章
doi：10.1002/mp.13958
更新日期：2020-03-01 00:00:00
abstract：:A simple approach was developed that calculates the output factors and tissue maximum ratio of an asymmetric field at any point within the open field, and specifically both at the central axis (when the jaws do not shadow it) and at the effective center of the open field, using the existing tables for symmetric fields...
journal_title：Medical physics
pub_type： 杂志文章
doi：10.1118/1.597524
更新日期：1995-01-01 00:00:00
abstract：:AAPM Magnetic Resonance Task Group #9 on proton magnetic resonance spectroscopy (MRS) in the brain was formed to provide a reference document for acquiring and processing proton (1H) MRS acquired from brain tissue. MRS is becoming a common adjunct to magnetic resonance imaging (MRI), especially for the differential di...
journal_title：Medical physics
pub_type： 指南,杂志文章,实务指引,评审
doi：10.1118/1.1501822
更新日期：2002-09-01 00:00:00
abstract：:The image artifacts characteristic of a scanning chest radiographic system are reviewed. The technique employs a pulsed beam of radiation swept in an overlapping raster pattern that can result in severe ripple and scan line artifacts with improper scanning parameters. A one-dimensional treatment of the scanner geometr...
journal_title：Medical physics
pub_type： 杂志文章
doi：10.1118/1.595492
更新日期：1984-03-01 00:00:00
abstract：:Skin entrance doses of patients undergoing interventional x-ray procedures are capable of causing skin damage and should be monitored routinely. Single TLD chips are not suitable because the location of maximum skin exposure cannot be predicted. Most photographic films are too sensitive at diagnostic x-ray energies fo...
journal_title：Medical physics
pub_type： 杂志文章
doi：10.1118/1.597973
更新日期：1997-10-01 00:00:00
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
更新日期：2000-03-01 00:00:00
abstract：:The purpose of this paper is to develop a method that reduces the number of segments for intensity modulated arc therapy (IMAT) and intensity modulated radiotherapy (IMRT) for concave target volumes (TV). The aim was to utilize no more than two intensity levels per organ at risk (OAR) and to derive both optimal segmen...
journal_title：Medical physics
pub_type： 杂志文章
doi：10.1118/1.1861161
更新日期：2005-03-01 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:To assess and compare the dosimetric impact of dynamic multileaf collimator (DMLC) tracking and gating as motion correction strategies to account for intrafraction motion during conventionally fractionated prostate radiotherapy. METHODS:A dose reconstruction method was used to retrospectively assess the dose d...
journal_title：Medical physics
pub_type： 杂志文章
doi：10.1118/1.4892605
更新日期：2014-09-01 00:00:00
