Design and evaluation of an MRI-compatible linear motion stage.

Abstract:

PURPOSE:To develop and evaluate a tool for accurate, reproducible, and programmable motion control of imaging phantoms for use in motion sensitive magnetic resonance imaging (MRI) appli cations. METHODS:In this paper, the authors introduce a compact linear motion stage that is made of nonmagnetic material and is actuated with an ultrasonic motor. The stage can be positioned at arbitrary positions and orientations inside the scanner bore to move, push, or pull arbitrary phantoms. Using optical trackers, measuring microscopes, and navigators, the accuracy of the stage in motion control was evaluated. Also, the effect of the stage on image signal-to-noise ratio (SNR), artifacts, and B0 field homogeneity was evaluated. RESULTS:The error of the stage in reaching fixed positions was 0.025 ± 0.021 mm. In execution of dynamic motion profiles, the worst-case normalized root mean squared error was below 7% (for frequencies below 0.33 Hz). Experiments demonstrated that the stage did not introduce artifacts nor did it degrade the image SNR. The effect of the stage on the B0 field was less than 2 ppm. CONCLUSIONS:The results of the experiments indicate that the proposed system is MRI-compatible and can create reliable and reproducible motion that may be used for validation and assessment of motion related MRI applications.

journal_name

Med Phys

journal_title

Medical physics

authors

Tavallaei MA,Johnson PM,Liu J,Drangova M

doi

10.1118/1.4937780

subject

Has Abstract

pub_date

2016-01-01 00:00:00

pages

62

issue

1

eissn

0094-2405

issn

2473-4209

journal_volume

43

pub_type

杂志文章
  • MO-A-217BCD-01: Internal Emitter Dose Estimation.

    abstract::Tissue absorbed dose (D) is a computed result for internal emitters. For fixed geometries, D is calculated by a matrix (S) multiplication of the integrated activity vector (Ã). The last quantity is usually measured by nuclear imaging of activity in various source organs and performing a temporal integration. Ã is the ...

    journal_title:Medical physics

    pub_type: 杂志文章

    doi:10.1118/1.4735750

    authors: Williams L

    更新日期:2012-06-01 00:00:00

  • SU-E-T-96: Energy Dependence of the New GafChromic- EBT3 Film's Dose Response-Curve.

    abstract:PURPOSE:To study and compare the dose response curves of the new GafChromic EBT3 film for megavoltage and kilovoltage x-ray beams, with different spatial resolution. METHODS:Two sets of EBT3 films (lot#A101711-02) were exposed to each x-ray beam (6MV, 15MV and 50kV) at 8 dose values (50-3200cGy). The megavoltage beams...

    journal_title:Medical physics

    pub_type: 杂志文章

    doi:10.1118/1.4735153

    authors: Chiu-Tsao S,Massillon-Jl G,Domingo-Muñoz I,Chan M

    更新日期:2012-06-01 00:00:00

  • Heating patterns of microwave applicators in inhomogeneous arm and thigh phantoms.

    abstract::Heating rate (HR) patterns in cylindrical structures were studied with inhomogeneous limb phantoms. These phantoms, arm and thigh models consisting of fat, bone, and muscle material, were heated with Clini-Therm L, M, and MS applicators at 915 MHz. The thigh model is 18 cm in diameter with 2.65-cm-thick fat on the out...

    journal_title:Medical physics

    pub_type: 杂志文章

    doi:10.1118/1.596627

    authors: Chou CK,McDougall JA,Chan KW,Luk KH

    更新日期:1991-11-01 00:00:00

  • Imaging of moving fiducial markers during radiotherapy using a fast, efficient active pixel sensor based EPID.

    abstract:PURPOSE:The purpose of this work was to investigate the use of an experimental complementary metal-oxide-semiconductor (CMOS) active pixel sensor (APS) for tracking of moving fiducial markers during radiotherapy. METHODS:The APS has an active area of 5.4 × 5.4 cm and maximum full frame read-out rate of 20 frame s(-1),...

    journal_title:Medical physics

    pub_type: 杂志文章

    doi:10.1118/1.3651632

    authors: Osmond JP,Zin HM,Harris EJ,Lupica G,Allinson NM,Evans PM

    更新日期:2011-11-01 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

  • 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

  • Analytical probabilistic modeling of dose-volume histograms.

    abstract:PURPOSE:Radiotherapy, especially with charged particles, is sensitive to executional and preparational uncertainties that propagate to uncertainty in dose and plan quality indicators, for example, dose-volume histograms (DVHs). Current approaches to quantify and mitigate such uncertainties rely on explicitly computed e...

    journal_title:Medical physics

    pub_type: 杂志文章

    doi:10.1002/mp.14414

    authors: Wahl N,Hennig P,Wieser HP,Bangert M

    更新日期:2020-10-01 00:00:00

  • Simultaneous super-resolution and contrast synthesis of routine clinical magnetic resonance images of the knee for improving automatic segmentation of joint cartilage: data from the Osteoarthritis Initiative.

    abstract:PURPOSE:High resolution three-dimensional (3D) magnetic resonance (MR) images are well suited for automated cartilage segmentation in the human knee joint. However, volumetric scans such as 3D Double-Echo Steady-State (DESS) images are not routinely acquired in clinical practice which limits opportunities for reliable ...

    journal_title:Medical physics

    pub_type: 杂志文章

    doi:10.1002/mp.14421

    authors: Neubert A,Bourgeat P,Wood J,Engstrom C,Chandra SS,Crozier S,Fripp J

    更新日期:2020-10-01 00:00:00

  • Focal spot motion of linear accelerators and its effect on portal image analysis.

    abstract::The focal spot of a linear accelerator is often considered to have a fully stable position. In practice, however, the beam control loop of a linear accelerator needs to stabilize after the beam is turned on. As a result, some motion of the focal spot might occur during the start-up phase of irradiation. When acquiring...

    journal_title:Medical physics

    pub_type: 杂志文章

    doi:10.1118/1.1576229

    authors: Sonke JJ,Brand B,van Herk M

    更新日期:2003-06-01 00:00:00

  • Dosimetric effect of respiration-gated beam on IMRT delivery.

    abstract::Intensity modulated radiation therapy (IMRT) with a dynamic multileaf collimator (DMLC) requires synchronization of DMLC leaf motion with dose delivery. A delay in DMLC communication is known to cause leaf lag and lead to dosimetric errors. The errors may be exacerbated by gated operation. The purpose of this study wa...

    journal_title:Medical physics

    pub_type: 杂志文章

    doi:10.1118/1.1592017

    authors: Duan J,Shen S,Fiveash JB,Brezovich IA,Popple RA,Pareek PN

    更新日期:2003-08-01 00:00:00

  • Implementing RapidArc into clinical routine: a comprehensive program from machine QA to TPS validation and patient QA.

    abstract:PURPOSE:With the increased commercial availability of intensity modulated arc therapy (IMAT) comes the need for comprehensive QA programs, covering the different aspects of this newly available technology. This manuscript proposes such a program for the RapidArc (RA) (Varian Medical Systems, Palo Alto) IMAT solution. ...

    journal_title:Medical physics

    pub_type: 杂志文章

    doi:10.1118/1.3622672

    authors: Van Esch A,Huyskens DP,Behrens CF,Samsoe E,Sjolin M,Bjelkengren U,Sjostrom D,Clermont C,Hambach L,Sergent F

    更新日期:2011-09-01 00:00:00

  • SU-E-T-300: Monte Carlo Simulation of Single-Plane Magnetically Focused Narrow Proton Beams.

    abstract::Purpose To investigate narrow, elongated magnetically focused proton beams and compare their properties with passively collimated beams using Monte Carlo simulation. METHODS:We performed Geant4 Monte Carlo simulations involving a single quadrapole focusing magnet, thereby creating a flattened beam with an elongated e...

    journal_title:Medical physics

    pub_type: 杂志文章

    doi:10.1118/1.4735386

    authors: McAuley G,Barnes S,Wroe A,Slater J

    更新日期:2012-06-01 00:00:00

  • Investigation of gamma knife image registration errors resulting from misalignment between the patient and the imaging axis.

    abstract::The ability of Leksell GammaPlan to perform stereotactic space localizations with image sets where there is misalignment of the patient's head (stereotactic frame and fiducial apparatus) relative to the computed tomography (CT) scanner coordinate system was studied. Misalignment is sometimes necessary for patient comf...

    journal_title:Medical physics

    pub_type: 杂志文章

    doi:10.1118/1.2179751

    authors: Cernica G,Wang Z,Malhotra H,de Boer S,Podgorsak MB

    更新日期:2006-04-01 00:00:00

  • SU-E-T-504: Incident Fluence Reconstruction Based on Monte Carlo Finite-Size Pencil Beam Model for Dose Guided Radiation Therapy.

    abstract:PURPOSE:In dose guided radiation therapy, incident fluence is one of the important parameters for both influence verification and dose reconstruction. The objective of this investigation was to develop a method to obtain the incident fluence for dose reconstruction in dose guided radiation therapy (DGRT). METHODS:An i...

    journal_title:Medical physics

    pub_type: 杂志文章

    doi:10.1118/1.4735593

    authors: Li G,Wu Y,FDS Team.

    更新日期:2012-06-01 00:00:00

  • Soft-tissue detectability in cone-beam CT: evaluation by 2AFC tests in relation to physical performance metrics.

    abstract::Soft-tissue detectability in cone-beam computed tomography (CBCT) was evaluated via two-alternative forced-choice (2AFC) tests. Investigations included the dependence of detectability on radiation dose, the influence of the asymmetric three-dimensional (3D) noise-power spectrum (NPS) in axial and sagittal or coronal p...

    journal_title:Medical physics

    pub_type: 杂志文章

    doi:10.1118/1.2790586

    authors: Tward DJ,Siewerdsen JH,Daly MJ,Richard S,Moseley DJ,Jaffray DA,Paul NS

    更新日期:2007-11-01 00:00:00

  • FRoG: An independent dose and LETd prediction tool for proton therapy at ProBeam® facilities.

    abstract:PURPOSE:Particle therapy is becoming increasingly available world-wide for precise tumor targeting, its favorable depth dose deposition, and increased biological damage to tumor tissue compared to conventional photon therapy. As demand increases for improved robustness and conformality, next-generation secondary dose c...

    journal_title:Medical physics

    pub_type: 杂志文章

    doi:10.1002/mp.14417

    authors: Kopp B,Fuglsang Jensen M,Mein S,Hoffmann L,Nyström H,Falk M,Haberer T,Abdollahi A,Debus J,Mairani A

    更新日期:2020-10-01 00:00:00

  • Evaluation of tumor localization in respiration motion-corrected cone-beam CT: prospective study in lung.

    abstract:PURPOSE:Target localization accuracy of cone-beam CT (CBCT) images used in radiation treatment of respiratory disease sites is affected by motion artifacts (blurring and streaking). The authors have previously reported on a method of respiratory motion correction in thoracic CBCT at end expiration (EE). The previous re...

    journal_title:Medical physics

    pub_type: 杂志文章

    doi:10.1118/1.4896101

    authors: Dzyubak O,Kincaid R,Hertanto A,Hu YC,Pham H,Rimner A,Yorke E,Zhang Q,Mageras GS

    更新日期:2014-10-01 00:00:00

  • Automatic detection of simulated motion blur in mammograms.

    abstract:PURPOSE:To use machine-learning algorithms and blur measure (BM) operators to automatically detect motion blur in mammograms. Motion blur has been reported to reduce lesion detection performance and mask small abnormalities, resulting in failure to detect them until they reach more advanced stages. Automatic detection ...

    journal_title:Medical physics

    pub_type: 杂志文章

    doi:10.1002/mp.14069

    authors: Kamona N,Loew M

    更新日期:2020-04-01 00:00:00

  • Estimation of organ doses from kilovoltage cone-beam CT imaging used during radiotherapy patient position verification.

    abstract:PURPOSE:The purpose of this study was to develop a practical method for estimating organ doses from kilovoltage cone-beam CT (CBCT) that can be performed with readily available phantoms and dosimeters. The accuracy of organ dose estimates made using the ImPACT patient dose calculator was also evaluated. METHODS:A 100 ...

    journal_title:Medical physics

    pub_type: 杂志文章

    doi:10.1118/1.3476459

    authors: Hyer DE,Hintenlang DE

    更新日期:2010-09-01 00:00:00

  • Development of a silicon diode detector for skin dosimetry in radiotherapy.

    abstract:PURPOSE:The aim of in vivo skin dosimetry was to measure the absorbed dose to the skin during radiotherapy, when treatment planning calculations cannot be relied on. It is of particularly importance in hypo-fractionated stereotactic modalities, where excessive dose can lead to severe skin toxicity. Currently, commercia...

    journal_title:Medical physics

    pub_type: 杂志文章

    doi:10.1002/mp.12469

    authors: Vicoroski N,Espinoza A,Duncan M,Oborn BM,Carolan M,Metcalfe P,Menichelli D,Perevertaylo VL,Lerch MLF,Rosenfeld AB,Petasecca M

    更新日期:2017-10-01 00:00:00

  • Characterization of distensibility, plaque burden, and composition of the atherosclerotic carotid artery using magnetic resonance imaging.

    abstract:PURPOSE:Arterial distensibility is a marker that can measure vessel wall functional and structural changes resulting from atherosclerosis with applications including estimation of mechanical properties of the wall. We sought to assess the feasibility of using magnetic resonance imaging (MRI) to include wall distensibil...

    journal_title:Medical physics

    pub_type: 杂志文章

    doi:10.1118/1.4754302

    authors: Canton G,Hippe DS,Sun J,Underhill HR,Kerwin WS,Tang D,Yuan C

    更新日期:2012-10-01 00:00:00

  • Validation of the Gatortail method for accurate sizing of pulmonary vessels from 3D medical images.

    abstract:PURPOSE:Detailed characterization of changes in vessel size is crucial for the diagnosis and management of a variety of vascular diseases. Because clinical measurement of vessel size is typically dependent on the radiologist's subjective interpretation of the vessel borders, it is often prone to high inter- and intra-u...

    journal_title:Medical physics

    pub_type: 杂志文章

    doi:10.1002/mp.12580

    authors: O'Dell WG,Gormaley AK,Prida DA

    更新日期:2017-12-01 00:00:00

  • Cascaded-systems analyses and the detective quantum efficiency of single-Z x-ray detectors including photoelectric, coherent and incoherent interactions.

    abstract:PURPOSE:Theoretical models of the detective quantum efficiency (DQE) of x-ray detectors are an important step in new detector development by providing an understanding of performance limitations and benchmarks. Previous cascaded-systems analysis (CSA) models accounted for photoelectric interactions only. This paper des...

    journal_title:Medical physics

    pub_type: 杂志文章

    doi:10.1118/1.4794495

    authors: Yun S,Tanguay J,Kim HK,Cunningham IA

    更新日期:2013-04-01 00:00:00

  • Segmentation and tracking of lung nodules via graph-cuts incorporating shape prior and motion from 4D CT.

    abstract:PURPOSE:We have developed a robust tool for performing volumetric and temporal analysis of nodules from respiratory gated four-dimensional (4D) CT. The method could prove useful in IMRT of lung cancer. METHODS:We modified the conventional graph-cuts method by adding an adaptive shape prior as well as motion informatio...

    journal_title:Medical physics

    pub_type: 杂志文章

    doi:10.1002/mp.12690

    authors: Cha J,Farhangi MM,Dunlap N,Amini AA

    更新日期:2018-01-01 00:00:00

  • Best estimate of luminal cross-sectional area of coronary arteries from angiograms.

    abstract::We have reexamined the problem of estimating the luminal area of an elliptically shaped coronary artery cross section from two or more radiographic diameter measurements. The expected error is found to be much smaller than the maximum potential error. In the cases of two orthogonal views, closed form expressions have ...

    journal_title:Medical physics

    pub_type: 杂志文章

    doi:10.1118/1.596296

    authors: Lee PL,Selzer RH

    更新日期:1988-07-01 00:00:00

  • Comparison of CBCT-based dose calculation methods in head and neck cancer radiotherapy: from Hounsfield unit to density calibration curve to deep learning.

    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

    authors: Barateau A,De Crevoisier R,Largent A,Mylona E,Perichon N,Castelli J,Chajon E,Acosta O,Simon A,Nunes JC,Lafond C

    更新日期:2020-10-01 00:00:00

  • CeBr3 scintillators for 4 He prompt gamma spectroscopy: Results from a Monte Carlo optimization study.

    abstract:PURPOSE:Range uncertainties limit the potential of charged particle therapy. In vivo and online range verification techniques could increase the confidence in the dose delivery distribution and lead to more conformal treatments. Prompt gamma imaging and prompt gamma spectroscopy (PGS) have been demonstrated for such a ...

    journal_title:Medical physics

    pub_type: 杂志文章

    doi:10.1002/mp.12795

    authors: Dal Bello R,Magalhaes Martins P,Seco J

    更新日期:2018-04-01 00:00:00

  • Real-time 4DMRI-based internal target volume definition for moving lung tumors.

    abstract:PURPOSE:In photon radiotherapy, respiratory-induced target motion can be accounted for by internal target volumes (ITV) or mid-ventilation target volumes (midV) defined on the basis of four-dimensional computed tomography (4D-CT). Intrinsic limitations of these approaches can result in target volumes that are not repre...

    journal_title:Medical physics

    pub_type: 杂志文章

    doi:10.1002/mp.14023

    authors: Rabe M,Thieke C,Düsberg M,Neppl S,Gerum S,Reiner M,Nicolay NH,Schlemmer HP,Debus J,Dinkel J,Landry G,Parodi K,Belka C,Kurz C,Kamp F

    更新日期:2020-04-01 00:00:00

  • X-ray spectral reconstruction from attenuation data using neural networks.

    abstract::An artificial neural network using input data derived from attenuation measurements was trained to generate spectral profiles (relative number of photons versus energy). Once the relative spectral distribution is reconstructed, absolute spectra (number of photons per unit exposure spectral distribution is reconstructe...

    journal_title:Medical physics

    pub_type: 杂志文章

    doi:10.1118/1.596495

    authors: Boone JM

    更新日期:1990-07-01 00:00:00

  • Monte Carlo and analytical model predictions of leakage neutron exposures from passively scattered proton therapy.

    abstract:PURPOSE:Stray neutron radiation is of concern after radiation therapy, especially in children, because of the high risk it might carry for secondary cancers. Several previous studies predicted the stray neutron exposure from proton therapy, mostly using Monte Carlo simulations. Promising attempts to develop analytical ...

    journal_title:Medical physics

    pub_type: 杂志文章

    doi:10.1118/1.4829512

    authors: Pérez-Andújar A,Zhang R,Newhauser W

    更新日期:2013-12-01 00:00:00