A technical solution to avoid partial scan artifacts in cardiac MDCT.

Abstract:

:Quantitative evaluation of cardiac image data obtained using multidetector row computed tomography (CT) is compromised by partial scan reconstructions, which improve the temporal resolution but significantly increase image-to-image CT number variations for a fixed region of interest compared to full reconstruction images. The feasibility of a new approach to solve this problem is assessed. An anthropomorphic cardiac phantom and an anesthetized pig were scanned on a dual-source CT scanner using both full and partial scan acquisition modes under different conditions. Additional scans were conducted with the electrocardiogram (ECG) signal being in synchrony with the gantry rotation. In the animal study, a simple x-ray detector was used to generate a signal once per gantry rotation. This signal was then used to pace the pig's heart. Phantom studies demonstrated that partial scan artifacts are strongly dependent on the rotational symmetry of angular projections, which is determined by the object shape and composition and its position with respect to the isocenter. The degree of partial scan artifacts also depends on the location of the region of interest with respect to highly attenuating materials (bones, iodine, etc.) within the object. Single-source partial scan images (165 ms temporal resolution) were significantly less affected by partial scan artifacts compared to dual-source partial scan images (82 ms temporal resolution). When the ECG signal was in synchrony with the gantry rotation, the same cardiac phase always corresponded to the same positions of the x-ray tube(s) and, hence, the same scattering and beam hardening geometry. As a result, the range of image-to-image CT number variations for partial scan reconstruction images acquired in synchronized mode was decreased to that achieved using full reconstruction image data. The success of the new approach, which synchronizes the ECG signal with the position of the x-ray tube(s), was demonstrated both in the phantom and animal experiments.

journal_name

Med Phys

journal_title

Medical physics

authors

Primak AN,Dong Y,Dzyubak OP,Jorgensen SM,McCollough CH,Ritman EL

doi

10.1118/1.2805476

subject

Has Abstract

pub_date

2007-12-01 00:00:00

pages

4726-37

issue

12

eissn

0094-2405

issn

2473-4209

journal_volume

34

pub_type

杂志文章
  • WE-G-217BCD-05: Fiducial Marker-Based Motion Compensation for the Acquisition of 3D Knee Geometry Under Weight-Bearing Conditions Using a C-Arm CT Scanner.

    abstract:PURPOSE:Imaging the knee under realistic load-bearing conditions can be carried out in a horizontal plane using a C-arm CT scanner. Human subjects can be scanned in a standing position and acquired data successfully reconstructed. However, reconstructing this data is a challenge due to significant artifacts that are in...

    journal_title:Medical physics

    pub_type: 杂志文章

    doi:10.1118/1.4736213

    authors: Choi JH,Keil A,Maier A,Pal S,McWalter EJ,Fahrig R

    更新日期:2012-06-01 00:00:00

  • A fast 4D IMRT/VMAT planning method based on segment aperture morphing.

    abstract:PURPOSE:Four-dimensional volumetric modulated arc therapy (4D VMAT) and four-dimensional intensity-modulated radiotherapy (4D IMRT) are developing radiation therapy treatment strategies designed to maximize dose conformality, minimize normal tissue dose, and deliver the treatment as efficiently as possible. The patient...

    journal_title:Medical physics

    pub_type: 杂志文章

    doi:10.1002/mp.12778

    authors: Klawikowski S,Tai A,Ates O,Ahunbay E,Li XA

    更新日期:2018-04-01 00:00:00

  • Kymogram detection and kymogram-correlated image reconstruction from subsecond spiral computed tomography scans of the heart.

    abstract::Subsecond single-slice, multi-slice or cone-beam spiral computed tomography (SSCT, MSCT, CBCT) offer great potential for improving heart imaging. Together with the newly developed phase-correlated cardiac reconstruction algorithms 180 degrees MCD and 180 degrees MCI [Med. Phys. 27, 1881-1902 (2000)] or related algorit...

    journal_title:Medical physics

    pub_type: 杂志文章

    doi:10.1118/1.1487861

    authors: Kachelriess M,Sennst DA,Maxlmoser W,Kalender WA

    更新日期:2002-07-01 00:00:00

  • A limit on dose reduction possible with CT reconstruction algorithms without prior knowledge of the scan subject.

    abstract:PURPOSE:To find an upper bound on the maximum dose reduction possible for any reconstruction algorithm, analytic or iterative, that result from the inclusion of the data statistics. The authors do not analyze noise reduction possible from prior knowledge or assumptions about the object. METHODS:The authors examined th...

    journal_title:Medical physics

    pub_type: 杂志文章

    doi:10.1118/1.4941954

    authors: Hsieh SS,Chesler DA,Fleischmann D,Pelc NJ

    更新日期:2016-03-01 00:00:00

  • A technique for noninvasive respiratory gated radiation treatment system based on a real time 3D ultrasound image correlation: a phantom study.

    abstract::This paper proposes a new respiratory gated radiation treatment system that allows real-time tumor localization while avoiding invasive operation to a patient. The proposed system employs a three-dimensional (3D) ultrasound device, a 3D digital localizer, and a real-time image processing system. At the planning time, ...

    journal_title:Medical physics

    pub_type: 杂志文章

    doi:10.1118/1.1634482

    authors: Sawada A,Yoda K,Kokubo M,Kunieda T,Nagata Y,Hiraoka M

    更新日期:2004-02-01 00:00:00

  • Computer-aided diagnosis in the era of deep learning.

    abstract::Computer-aided diagnosis (CAD) has been a major field of research for the past few decades. CAD uses machine learning methods to analyze imaging and/or nonimaging patient data and makes assessment of the patient's condition, which can then be used to assist clinicians in their decision-making process. The recent succe...

    journal_title:Medical physics

    pub_type: 杂志文章

    doi:10.1002/mp.13764

    authors: Chan HP,Hadjiiski LM,Samala RK

    更新日期:2020-06-01 00:00:00

  • A comparison of gantry-mounted x-ray-based real-time target tracking methods.

    abstract:PURPOSE:Most modern radiotherapy machines are built with a 2D kV imaging system. Combining this imaging system with a 2D-3D inference method would allow for a ready-made option for real-time 3D tumor tracking. This work investigates and compares the accuracy of four existing 2D-3D inference methods using both motion tr...

    journal_title:Medical physics

    pub_type: 杂志文章

    doi:10.1002/mp.12765

    authors: Montanaro T,Nguyen DT,Keall PJ,Booth J,Caillet V,Eade T,Haddad C,Shieh CC

    更新日期:2018-03-01 00:00:00

  • X-ray imaging with amorphous selenium: X-ray to charge conversion gain and avalanche multiplication gain.

    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

    authors: Hunt DC,Kirby SS,Rowlands JA

    更新日期:2002-11-01 00:00:00

  • Interplay effect on a 6-MV flattening-filter-free linear accelerator with high dose rate and fast multi-leaf collimator motion treating breast and lung phantoms.

    abstract:PURPOSE:Using a new linear accelerator with high dose rate (800 MU/min), fast MLC motions (5.0 cm/s), fast gantry rotation (15 s/rotation), and 1 cm wide MLCs, we aimed to quantify the effects of complexity, arc number, and fractionation on interplay for breast and lung treatments under target motion. METHODS:To study...

    journal_title:Medical physics

    pub_type: 杂志文章

    doi:10.1002/mp.12899

    authors: Netherton T,Li Y,Nitsch P,Shaitelman S,Balter P,Gao S,Klopp A,Muruganandham M,Court L

    更新日期:2018-06-01 00:00:00

  • In vivo surface dosimetry with a scintillating fiber dosimeter in preclinical image-guided radiotherapy.

    abstract:PURPOSE:New preclinical image-guided irradiators and treatment planning systems represent a huge progress in radiobiology. Nevertheless, quality control of preclinical treatments is not as advanced as in clinical radiotherapy and in vivo dosimetry is less developed. In this study, we evaluate the use of a scintillating...

    journal_title:Medical physics

    pub_type: 杂志文章

    doi:10.1002/mp.13903

    authors: Le Deroff C,Pérès EA,Ledoux X,Toutain J,Frelin-Labalme AM

    更新日期:2020-01-01 00:00:00

  • Objected constrained registration and manifold learning: a new patient setup approach in image guided radiation therapy of thoracic cancer.

    abstract:PURPOSE:The management of thoracic malignancies with radiation therapy is complicated by continuous target motion. In this study, a real time motion analysis approach is proposed to improve the accuracy of patient setup. METHODS:For 11 lung cancer patients a long training fluoroscopy was acquired before the first trea...

    journal_title:Medical physics

    pub_type: 临床试验,杂志文章

    doi:10.1118/1.4794489

    authors: Chen T,Jabbour SK,Qin S,Haffty BG,Yue N

    更新日期:2013-04-01 00:00:00

  • Measurement of energy dependence for XRCT radiochromic film.

    abstract::Gafchromic XRCT, radiochromic film is assessed over a broad energy range, from kilovoltage to megavoltage x rays for variations in reflected optical density to dose response. A large energy dependence was found with reflected optical density output for the same delivered dose varying from 7.8 +/- 0.35 at 25.5 keV (50 ...

    journal_title:Medical physics

    pub_type: 杂志文章

    doi:10.1118/1.2219330

    authors: Butson MJ,Cheung T,Yu PK

    更新日期:2006-08-01 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

  • Multiple Feature-based Portal Vein Classification for Liver Segments Extraction.

    abstract:PURPOSE:The liver segments divided by Couinaud classification method are used to understand the functional anatomy of liver, which is significant in hepatic resection surgery. In Couinaud classification method, each third-order branch of the portal vein (PV) defines the supplied territory of a corresponding liver segme...

    journal_title:Medical physics

    pub_type: 杂志文章

    doi:10.1002/mp.14745

    authors: Wu C,Fu T,Gao Y,Liu Y,Fan J,Ai D,Song H,Yang J

    更新日期:2021-02-02 00:00:00

  • A method to compare supra-pubic ultrasound and CT images of the prostate: technique and early clinical results.

    abstract::We describe a unique method that allows the comparison of spatially registered ultrasound (SRUS) images and computed tomography-derived contours (CTDCs) that were acquired with a minimal time lapse. As such, we have a tool that will provide validation of the spatial accuracy of the US system and that will allow compar...

    journal_title:Medical physics

    pub_type: 杂志文章

    doi:10.1118/1.1644515

    authors: Molloy JA,Srivastava S,Schneider BF

    更新日期:2004-03-01 00:00:00

  • Development of a Monte Carlo multiple source model for inclusion in a dose calculation auditing tool.

    abstract:PURPOSE:The Imaging and Radiation Oncology Core Houston (IROC-H) (formerly the Radiological Physics Center) has reported varying levels of agreement in their anthropomorphic phantom audits. There is reason to believe one source of error in this observed disagreement is the accuracy of the dose calculation algorithms an...

    journal_title:Medical physics

    pub_type: 杂志文章

    doi:10.1002/mp.12426

    authors: Faught AM,Davidson SE,Fontenot J,Kry SF,Etzel C,Ibbott GS,Followill DS

    更新日期:2017-09-01 00:00:00

  • Quantum noise in detectors.

    abstract::The variance in the number of x-ray photons absorbed by a detector is derived from theoretical considerations. The distributions in the number of x-ray photons produced by the x-ray tube, transmitted through the patient, and absorbed by the detector are described. These distributions are compounded to yield a distribu...

    journal_title:Medical physics

    pub_type: 杂志文章

    doi:10.1118/1.595393

    authors: Rimkus D,Baily NA

    更新日期:1983-07-01 00:00:00

  • Relaxing leaf-motion restrictions in dynamic multileaf collimator leaf sequencing.

    abstract:PURPOSE:Traditionally, unidirectional leaf-sweeping schemes have been employed to deliver IMRT plans using the dynamic multileaf collimator (DMLC) technique. The goal of this research is to investigate the potential impact of relaxing the leaf-motion restrictions in DMLC IMRT on the beam-modulation quality and the deli...

    journal_title:Medical physics

    pub_type: 杂志文章

    doi:10.1002/mp.13158

    authors: Mirzapour SA,Salari E

    更新日期:2018-11-01 00:00:00

  • SU-E-I-32: Sterile Radiation Reduction Gloves May Be Contraindicated in Fluoroscopically Guided Interventions.

    abstract:PURPOSE:Sterile radiation reduction gloves have been widely used in the past decade to provide modest decreases in operator hand dose when the hands are placed in the field of view (FOV). While multiple publications have quantified the potential dose reduction from the use of such gloves, possible effects on the patien...

    journal_title:Medical physics

    pub_type: 杂志文章

    doi:10.1118/1.4734747

    authors: Pasciak A,Neveu M,Sriharan A,Balius A,Jones A

    更新日期:2012-06-01 00:00:00

  • A statistical approach to infer the minimum setup distance of a well chamber to the wall or to the floor for 192Ir HDR calibration.

    abstract::We propose a new method based on statistical analysis technique to determine the minimum setup distance of a well chamber used in the calibration of 192Ir high dose rate (HDR). The chamber should be placed at least this distance away from any wall or from the floor in order to mitigate the effect of scatter. Three dif...

    journal_title:Medical physics

    pub_type: 杂志文章

    doi:10.1118/1.2911156

    authors: Chang L,Ho SY,Chui CS,Lee JH,Du YC,Chen T

    更新日期:2008-06-01 00:00:00

  • SU-E-J-139: Feasibility of Using EPID for Real-Time Target Localization during Treatment.

    abstract:PURPOSE:This study aims to investigate the feasibility of using the images of the treatment fields acquired by an electronic portal imaging device (EPID) for real-time target localization. METHODS:Forty one patients treated with IMRT and RapidArc were recruited in this study including 37 prostate patients and 4 lung p...

    journal_title:Medical physics

    pub_type: 杂志文章

    doi:10.1118/1.4734975

    authors: Xu Q,Lin M,Chen X,Tong X,Fan J,Dong Z,Chen L,Ma C

    更新日期:2012-06-01 00:00:00

  • Plan averaging for multicriteria navigation of sliding window IMRT and VMAT.

    abstract:PURPOSE:To describe a method for combining sliding window plans [intensity modulated radiation therapy (IMRT) or volumetric modulated arc therapy (VMAT)] for use in treatment plan averaging, which is needed for Pareto surface navigation based multicriteria treatment planning. METHODS:The authors show that by taking an...

    journal_title:Medical physics

    pub_type: 杂志文章

    doi:10.1118/1.4859295

    authors: Craft D,Papp D,Unkelbach J

    更新日期:2014-02-01 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 CT-based Monte Carlo simulation tool for dosimetry planning and analysis.

    abstract::The Los Alamos code MCNP4A (Monte Carlo N-Particle version 4A) is currently used to simulate a variety of problems ranging from nuclear reactor analysis to boron neutron capture therapy. A graphical user interface has been developed that automatically sets up the MCNP4A geometry and radiation source requirements for a...

    journal_title:Medical physics

    pub_type: 杂志文章

    doi:10.1118/1.598167

    authors: DeMarco JJ,Solberg TD,Smathers JB

    更新日期:1998-01-01 00:00:00

  • Absorbed dose in the presence of contrast agents during pediatric cardiac catheterization.

    abstract::Administration of x-ray contrast agents during heart catheterization examination increases the absorbed radiation dose in tissue. To estimate the dose absorbed by the blood of children undergoing diagnostic heart catheterization and angiocardiography, a number of measurements and calculations were conducted. First, en...

    journal_title:Medical physics

    pub_type: 杂志文章

    doi:10.1118/1.594613

    authors: Callisen HH,Norman A,Adams FH

    更新日期:1979-11-01 00:00:00

  • Patch-based generation of a pseudo CT from conventional MRI sequences for MRI-only radiotherapy of the brain.

    abstract:PURPOSE:In radiotherapy (RT) based on magnetic resonance imaging (MRI) as the only modality, the information on electron density must be derived from the MRI scan by creating a so-called pseudo computed tomography (pCT). This is a nontrivial task, since the voxel-intensities in an MRI scan are not uniquely related to e...

    journal_title:Medical physics

    pub_type: 杂志文章

    doi:10.1118/1.4914158

    authors: Andreasen D,Van Leemput K,Hansen RH,Andersen JA,Edmund JM

    更新日期:2015-04-01 00:00:00

  • Optimizing cone beam CT scatter estimation in egs_cbct for a clinical and virtual chest phantom.

    abstract:PURPOSE:Cone beam computed tomography (CBCT) image quality suffers from contamination from scattered photons in the projection images. Monte Carlo simulations are a powerful tool to investigate the properties of scattered photons.egs_cbct, a recent EGSnrc user code, provides the ability of performing fast scatter calcu...

    journal_title:Medical physics

    pub_type: 杂志文章

    doi:10.1118/1.4881142

    authors: Thing RS,Mainegra-Hing E

    更新日期:2014-07-01 00:00:00

  • X-ray-transmission computed tomography.

    abstract::The immediate goal of clinically based x-ray-transmission computed tomography (CT) is to provide a measurement of the x-ray linear attenuation coefficient in cross section with the ultimate goal of impacting on patient management and care. To do this with the accuracy needed for clinical goals requires the careful int...

    journal_title:Medical physics

    pub_type: 杂志文章,评审

    doi:10.1118/1.594381

    authors: McCullough EC,Payne JT

    更新日期:1977-03-01 00:00:00

  • General strategy for the protection of organs at risk in IMRT therapy of a moving body.

    abstract::We investigated protection strategies of organs at risk (OARs) in intensity modulated radiation therapy (IMRT). These strategies apply to delivery of IMRT to moving body anatomies that show relative displacement of OAR in close proximity to a tumor target. We formulated an efficient genetic algorithm which makes it po...

    journal_title:Medical physics

    pub_type: 杂志文章

    doi:10.1118/1.3132305

    authors: Abolfath RM,Papiez L

    更新日期:2009-07-01 00:00:00

  • Micro-angiography for neuro-vascular imaging. II. Cascade model analysis.

    abstract::A micro-angiographic detector was designed and its performance was previously tested to evaluate its feasibility as an improvement over current x-ray detectors for neuro-interventional imaging. The detector was shown to have a modulation transfer function value of about 2% at the Nyquist frequency of 10 cycles/mm and ...

    journal_title:Medical physics

    pub_type: 杂志文章

    doi:10.1118/1.1617550

    authors: Ganguly A,Rudin S,Bednarek DR,Hoffmann KR

    更新日期:2003-11-01 00:00:00