Optimal slice thickness for object detection with longitudinal partial volume effects in computed tomography.

Abstract:

:Longitudinal partial volume effects (z-axial PVE), which occur when an object partly occupies a slice, degrade image resolution and contrast in computed tomography (CT). Z-axial PVE is unavoidable for subslice objects and reduces their contrast according to their fraction contained within the slice. This effect can be countered using a smaller slice thickness, but at the cost of an increased image noise or radiation dose. The aim of this study is to offer a tool for optimizing the reconstruction parameters (slice thickness and slice spacing) in CT protocols in the case of partial volume effects. This optimization is based on the tradeoff between axial resolution and noise. For that purpose, we developed a simplified analytical model investigating the average statistical effect of z-axial PVE on contrast and contrast-to-noise ratio (CNR). A Catphan 500 phantom was scanned with various pitches and CTDI and reconstructed with different slice thicknesses to assess the visibility of subslice targets that simulate low contrast anatomical features present in CT exams. The detectability score of human observers was used to rank the perceptual image quality against the CNR. Contrast and CNR reduction due to z-axial PVE measured on experimental data were first compared to numerical calculations and then to the analytical model. Compared to numerical calculations, the simplified algebraic model slightly overestimated the contrast but the differences remained below 5%. It could determine the optimal reconstruction parameters that maximize the objects visibility for a given dose in the case of z-axial PVE. An optimal slice thickness equal to three-fourth of the object width was correctly proposed by the model for nonoverlapping slices. The tradeoff between detectability and dose is maximized for a slice spacing of half the slice thickness associated with a slice width equal to the characteristic object width.

journal_name

J Appl Clin Med Phys

authors

Monnin P,Sfameni N,Gianoli A,Ding S

doi

10.1002/acm2.12005

subject

Has Abstract

pub_date

2017-01-01 00:00:00

pages

251-259

issue

1

issn

1526-9914

journal_volume

18

pub_type

杂志文章
  • Anatomy-based, patient-specific VMAT QA using EPID or MLC log files.

    abstract::In this project, we investigated the use of an electronic portal imaging device (EPID), together with the treatment planning system (TPS) and MLC log files, to determine the delivered doses to the patient and evaluate the agreement between the treatment plan and the delivered dose distribution. The QA analysis results...

    journal_title:Journal of applied clinical medical physics

    pub_type: 杂志文章

    doi:10.1120/jacmp.v16i3.5283

    authors: Defoor DL,Vazquez-Quino LA,Mavroidis P,Papanikolaou N,Stathakis S

    更新日期:2015-05-08 00:00:00

  • Effect of skull shape approximations in Gamma Knife dose calculations.

    abstract::Doses in Leksell GammaPlan (Elekta, Stockholm, Sweden) are calculated for each shot by summing the contribution from the 201 radiation beams emitted by the Gamma Knife (Elekta), weighted for attenuation in the tissue traversed. The patient's head is modeled based on 24 skull measurements, from which the depth to the c...

    journal_title:Journal of applied clinical medical physics

    pub_type: 杂志文章

    doi:10.1120/jacmp.v8i3.2377

    authors: Berndt A,Beck J

    更新日期:2007-07-17 00:00:00

  • Long term stability of a 50 kV X-ray unit for stereotactic irradiation.

    abstract::A low-energy (50 kV) X-ray tube used for the stereotactic irradiation of intracranial lesions has been in use since 1999. The unit is calibrated prior to every procedure and during periodic quality assurance (QA) tests. The unit uses an internal and an external scintillation detector to monitor dose as well as a conve...

    journal_title:Journal of applied clinical medical physics

    pub_type: 杂志文章

    doi:10.1120/jacmp.v7i3.2238

    authors: Biggs PJ

    更新日期:2006-08-24 00:00:00

  • Effect of ROI filtering in 3D cone-beam rotational angiography on organ dose and effective dose in cerebral investigations.

    abstract::The assessment of intracranial aneurysms is increasingly performed using three-dimensional cone-beam rotational angiography (3D CBRA). To reduce the dose to the patient during 3D CBRA procedures, filtered region-of-interest imaging (FROI) is presented in literature to be an effective technique as the dose in regions o...

    journal_title:Journal of applied clinical medical physics

    pub_type: 杂志文章

    doi:10.1120/jacmp.v16i2.5306

    authors: Göpfert F,Schmidt R,Wulff J,Zink K

    更新日期:2015-03-08 00:00:00

  • Accuracy of one algorithm used to modify a planned DVH with data from actual dose delivery.

    abstract::Detection and accurate quantification of treatment delivery errors is important in radiation therapy. This study aims to evaluate the accuracy of DVH based QA in quantifying delivery errors. Eighteen previously treated VMAT plans (prostate, H&N, and brain) were randomly chosen for this study. Conventional IMRT deliver...

    journal_title:Journal of applied clinical medical physics

    pub_type: 杂志文章

    doi:10.1120/jacmp.v17i5.6344

    authors: Ma T,Podgorsak MB,Kumaraswamy LK

    更新日期:2016-09-08 00:00:00

  • Evaluation of offline adaptive planning techniques in image-guided brachytherapy of cervical cancer.

    abstract::Modern three-dimensional image-guided intracavitary high dose rate (HDR) brachytherapy is often used in combination with external beam radiotherapy (EBRT) to manage cervical cancer. Intrafraction motion of critical organs relative to the HDR applicator in the time between the planning CT and treatment delivery can cau...

    journal_title:Journal of applied clinical medical physics

    pub_type: 杂志文章

    doi:10.1002/acm2.12462

    authors: Liu H,Kinard J,Maurer J,Shang Q,Vanderstraeten C,Hayes L,Sintay B,Wiant D

    更新日期:2018-11-01 00:00:00

  • Detection of electron beam energy variations using a computed radiography system.

    abstract::A method to evaluate the electron beam energy constancy by employing the computed radiography (CR) system has been developed. In this method, a right triangular plastic wedge is used to produce a curve of the CR storage phosphor plate signal versus the wedge thickness. The curve, which resembles the percentage depth i...

    journal_title:Journal of applied clinical medical physics

    pub_type: 杂志文章

    doi:10.1120/jacmp.v10i4.2911

    authors: Cai YC,Ge Y,Bernard D,Turian J,Chu JCH

    更新日期:2009-10-15 00:00:00

  • Evaluating the positional uncertainty of intrafraction, adjacent fields, and daily setup with the BrainLAB ExacTrac system in patients who are receiving craniospinal irradiation.

    abstract:PURPOSE:To investigate the daily setup, interfraction motion, variability in the junction areas, and dosimetric effect in craniospinal irradiation (CSI) patients. METHODS:Fifteen CSI patients who had undergone split-field IMRT were followed in the study. Previous, middle, and posttreatment, each target volume position...

    journal_title:Journal of applied clinical medical physics

    pub_type: 杂志文章

    doi:10.1002/acm2.12909

    authors: Duan X,Zhou Y,Dai H,Zhao L,Qian J,Yang D,Zhang L,Luo C,Li G

    更新日期:2020-08-01 00:00:00

  • Superficial and peripheral dose in compensator-based FFF beam IMRT.

    abstract::Flattening filter-free (FFF) beams produce higher dose rates. Combined with compensator-based intensity modulated radiotherapy (IMRT) techniques, the dose delivery for each beam can be much shorter compared to the flattened beam MLC-based or flattened beam compensator-based IMRT. This 'snap shot' IMRT delivery is bene...

    journal_title:Journal of applied clinical medical physics

    pub_type: 杂志文章

    doi:10.1002/acm2.12018

    authors: Zhang DG,Feygelman V,Moros EG,Latifi K,Hoffe S,Frakes J,Zhang GG

    更新日期:2017-01-01 00:00:00

  • Detector system dose verification comparisons for arc therapy: couch vs. gantry mount.

    abstract::The aim of this study was to assess the performance of a gantry-mounted detector system and a couch set detector system using a systematic multileaf collimator positional error manually introduced for volumetric-modulated arc therapy. Four head and neck and esophagus VMAT plans were evaluated by measurement using an e...

    journal_title:Journal of applied clinical medical physics

    pub_type: 杂志文章

    doi:10.1120/jacmp.v15i3.4495

    authors: Manikandan A,Sarkar B,Nandy M,Sureka CS,Gossman MS,Sujatha N,Rajendran VT

    更新日期:2014-05-08 00:00:00

  • An algorithm for automated modulation transfer function measurement using an edge of a PMMA phantom: Impact of field of view on spatial resolution of CT images.

    abstract:PURPOSE:The purpose of this study was to introduce a new algorithm for automated measurement of the modulation transfer function (MTF) using an edge of a readily available phantom and to evaluate the effect of reconstruction filter and field of view (FOV) on the spatial resolution in the CT images. METHODS:Our automat...

    journal_title:Journal of applied clinical medical physics

    pub_type: 杂志文章

    doi:10.1002/acm2.12476

    authors: Anam C,Fujibuchi T,Budi WS,Haryanto F,Dougherty G

    更新日期:2018-11-01 00:00:00

  • Investigation of error detection capabilities of phantom, EPID and MLC log file based IMRT QA methods.

    abstract::A patient specific quality assurance (QA) should detect errors that originate anywhere in the treatment planning process. However, the increasing complexity of treatment plans has increased the need for improvements in the accuracy of the patient specific pretreatment verification process. This has led to the utilizat...

    journal_title:Journal of applied clinical medical physics

    pub_type: 杂志文章

    doi:10.1002/acm2.12114

    authors: Defoor DL,Stathakis S,Roring JE,Kirby NA,Mavroidis P,Obeidat M,Papanikolaou N

    更新日期:2017-07-01 00:00:00

  • Dependence of intrafraction motion on fraction duration for pediatric patients with brain tumors.

    abstract::The purpose of this study was to quantify the intrafraction motion of pediatric patients with brain tumors during radiation therapy and investigate any correlation between motion, use of general anesthesia, and daily treatment duration. 100 pediatric patients with a mean age of 8.5 years (range: 1.0 to 17.8) were incl...

    journal_title:Journal of applied clinical medical physics

    pub_type: 杂志文章

    doi:10.1120/jacmp.v12i4.3609

    authors: Beltran C,Merchant TE

    更新日期:2011-11-15 00:00:00

  • Assessment and management of radiotherapy beam intersections with the treatment couch.

    abstract::The impact of the treatment couch on a radiotherapy plan is rarely fully assessed during the treatment planning process. Incorporating a couch model into the treatment planning system (TPS) enables the planner to avoid or dosimetrically evaluate beam-couch intersections. In this work, we demonstrate how existing TPS t...

    journal_title:Journal of applied clinical medical physics

    pub_type: 杂志文章

    doi:10.1120/jacmp.v11i2.3171

    authors: Van Prooijen M,Kanesalingam T,Islam MK,Heaton RK

    更新日期:2010-04-19 00:00:00

  • Feasibility of the new copper pipe method for evaluating half-value layer in computed tomography: A measurement and Monte Carlo simulation study.

    abstract::This study aimed to verify the accuracy of half-value layer (HVL) measured using the new copper pipe method with the CT ionization chamber while the X-ray tube is rotating and to compare it with the conventional nonrotating method and Monte Carlo simulation method based on the actual measurement and geometry of the ne...

    journal_title:Journal of applied clinical medical physics

    pub_type: 杂志文章

    doi:10.1002/acm2.12780

    authors: Okubo R,Matsubara K,Chusin T,Hibino T,Ito Y

    更新日期:2019-12-01 00:00:00

  • Peer support: A needs assessment for social support from trained peers in response to stress among medical physicists.

    abstract:PURPOSE:Previous studies suggest that within radiation oncology, medical physicists (MP) experience high workloads. Little is known about how MPs use social support (SS) in times of stress. METHODS:In collaboration with the Workgroup on Prevention of Medical Error, the American Association of Physicists in Medicine ad...

    journal_title:Journal of applied clinical medical physics

    pub_type: 杂志文章

    doi:10.1002/acm2.12675

    authors: Johnson J,Ford E,Yu J,Buckey C,Fogh S,Evans SB

    更新日期:2019-09-01 00:00:00

  • Automated phantom analysis for gamma cameras and SPECT: A methodology for use in a clinical setting.

    abstract:PURPOSE:We introduce an automated, quantitative image analysis package for gamma camera and single photon emission computed tomography quality control. Our focus was to produce consistent methods that are feasible in clinical settings and use standard phantoms. METHODS:Four gamma cameras were used to acquire planar im...

    journal_title:Journal of applied clinical medical physics

    pub_type: 杂志文章

    doi:10.1002/acm2.13057

    authors: Tazegul TE,Polemi AM,Snyder A,Snyder C,Collins PG

    更新日期:2020-11-03 00:00:00

  • Combination effects of tissue heterogeneity and geometric targeting error in stereotactic body radiotherapy for lung cancer using CyberKnife.

    abstract::We have investigated the combined effect of tissue heterogeneity and its variation associated with geometric error in stereotactic body radiotherapy (SBRT) for lung cancer. The treatment plans for eight lung cancer patients were calculated using effective path length (EPL) correction and Monte Carlo (MC) algorithms, w...

    journal_title:Journal of applied clinical medical physics

    pub_type: 杂志文章

    doi:10.1120/jacmp.v16i5.5397

    authors: Kang KM,Jeong BK,Choi HS,Yoo SH,Hwang UJ,Lim YK,Jeong H

    更新日期:2015-09-08 00:00:00

  • Evaluation of three APBI techniques under NSABP B-39 guidelines.

    abstract::This work compares two accelerated partial breast irradiation modalities, MammoSite brachytherapy and three dimensional conformal radiotherapy (3D-CRT), to a new method, SAVI brachytherapy, following NSABP B-39 guidelines. A total of 21 patients treated at UC San Diego with the SAVI device were evaluated in this compa...

    journal_title:Journal of applied clinical medical physics

    pub_type: 杂志文章

    doi:10.1120/jacmp.v11i1.3021

    authors: Scanderbeg D,Yashar C,White G,Rice R,Pawlicki T

    更新日期:2009-12-03 00:00:00

  • Linac-based stereotactic radiosurgery (SRS) in the treatment of refractory trigeminal neuralgia: Detailed description of SRS procedure and reported clinical outcomes.

    abstract:PURPOSE/OBJECTIVES:To present our linac-based SRS procedural technique for medically and/or surgically refractory trigeminal neuralgia (TN) treatment and simultaneously report our clinical outcomes. MATERIALS AND METHODS:Twenty-seven refractory TN patients who were treated with a single fraction of 80 Gy to TN. Treatm...

    journal_title:Journal of applied clinical medical physics

    pub_type: 杂志文章

    doi:10.1002/acm2.12057

    authors: Pokhrel D,Sood S,McClinton C,Saleh H,Badkul R,Jiang H,Stepp T,Camarata P,Wang F

    更新日期:2017-03-01 00:00:00

  • Dose differences in intensity-modulated radiotherapy plans calculated with pencil beam and Monte Carlo for lung SBRT.

    abstract::For patients with medically inoperable early-stage non-small cell lung cancer (NSCLC) treated with stereotactic body radiation therapy, early treatment plans were based on a simpler dose calculation algorithm, the pencil beam (PB) calculation. Because these patients had the longest treatment follow-up, identifying dos...

    journal_title:Journal of applied clinical medical physics

    pub_type: 杂志文章

    doi:10.1120/jacmp.v16i6.5514

    authors: Liu H,Zhuang T,Stephans K,Videtic G,Raithel S,Djemil T,Xia P

    更新日期:2015-11-08 00:00:00

  • Modeling Elekta VersaHD using the Varian Eclipse treatment planning system for photon beams: A single-institution experience.

    abstract::The aim of this study was to report a single-institution experience and commissioning data for Elekta VersaHD linear accelerators (LINACs) for photon beams in the Eclipse treatment planning system (TPS). Two VersaHD LINACs equipped with 160-leaf collimators were commissioned. For each energy, the percent-depth-dose (P...

    journal_title:Journal of applied clinical medical physics

    pub_type: 临床试验,杂志文章

    doi:10.1002/acm2.12709

    authors: Zhang Y,Le AH,Tian Z,Iqbal Z,Chiu T,Gu X,Pugachev A,Reynolds R,Park YK,Lin MH,Stojadinovic S

    更新日期:2019-10-01 00:00:00

  • Effect of audio instruction on tracking errors using a four-dimensional image-guided radiotherapy system.

    abstract::The Vero4DRT (MHI-TM2000) is capable of performing X-ray image-based tracking (X-ray Tracking) that directly tracks the target or fiducial markers under continuous kV X-ray imaging. Previously, we have shown that irregular respiratory patterns increased X-ray Tracking errors. Thus, we assumed that audio instruction, w...

    journal_title:Journal of applied clinical medical physics

    pub_type: 杂志文章

    doi:10.1120/jacmp.v14i5.4488

    authors: Nakamura M,Sawada A,Mukumoto N,Takahashi K,Mizowaki T,Kokubo M,Hiraoka M

    更新日期:2013-09-06 00:00:00

  • Experience in implementing continuous arterial spin labeling on a commercial MR scanner.

    abstract::Continuous arterial spin labeling (CASL) is a technique for performing quantitative perfusion measurements without the need for exogenous contrast agent administration. This technique has seen limited use in the clinic due to problems of poor sensitivity and the potential for artifacts. In addition, CASL requires the ...

    journal_title:Journal of applied clinical medical physics

    pub_type: 临床试验,杂志文章

    doi:10.1120/jacmp.v6i1.2068

    authors: Steger TR,Jackson EF

    更新日期:2005-01-01 00:00:00

  • Introduction to passive electron intensity modulation.

    abstract::This work introduces a new technology for electron intensity modulation, which uses small area island blocks within the collimating aperture and small area island apertures in the collimating insert. Due to multiple Coulomb scattering, electrons contribute dose under island blocks and lateral to island apertures. By s...

    journal_title:Journal of applied clinical medical physics

    pub_type: 杂志文章

    doi:10.1002/acm2.12163

    authors: Hogstrom KR,Carver RL,Chambers EL,Erhart K

    更新日期:2017-11-01 00:00:00

  • Treatment of cervical cancer with electronic brachytherapy.

    abstract:PURPOSE:We report the first cervical cancer cases treated with interstitial electronic brachytherapy (eBT) at our hospital and compare them with plans made with high-dose-rate interstitial brachytherapy based on Ir192 (HDR-BT). MATERIALS AND METHODS:Eight patients with cervical cancer were treated with the Axxent eBT ...

    journal_title:Journal of applied clinical medical physics

    pub_type: 杂志文章

    doi:10.1002/acm2.12657

    authors: Lozares-Cordero S,Font-Gómez JA,Gandía-Martínez A,Miranda-Burgos A,Méndez-Villamón A,Villa-Gazulla D,Alba-Escorihuela V,Jiménez-Puertas S,González-Pérez V

    更新日期:2019-07-01 00:00:00

  • Beam-specific planning target volumes incorporating 4D CT for pencil beam scanning proton therapy of thoracic tumors.

    abstract::The purpose of this study is to determine whether organ sparing and target coverage can be simultaneously maintained for pencil beam scanning (PBS) proton therapy treatment of thoracic tumors in the presence of motion, stopping power uncertainties, and patient setup variations. Ten consecutive patients that were previ...

    journal_title:Journal of applied clinical medical physics

    pub_type: 杂志文章

    doi:10.1120/jacmp.v16i6.5678

    authors: Lin L,Kang M,Huang S,Mayer R,Thomas A,Solberg TD,McDonough JE,Simone CB 2nd

    更新日期:2015-11-08 00:00:00

  • Case study of radiation therapy treatment of a patient with a cardiac ventricular assist device.

    abstract::A patient with a cardiac ventricular assist device (VAD) with computer-controlled driver presented to our department for radiation therapy. The treatment plan was 4500 cGy to the rectum over 25 fractions with 15MV photon beams. All beams avoided the pump and leads. The response to electromagnetic interference (EMI) wa...

    journal_title:Journal of applied clinical medical physics

    pub_type: 杂志文章

    doi:10.1120/jacmp.v9i4.2851

    authors: Lasher DE,Wojcicka JB,Malcom R,Shears LL

    更新日期:2008-10-29 00:00:00

  • A quality assurance tool for helical tomotherapy using a step-wedge phantom and the on-board MVCT detector.

    abstract::The purpose of this study was to develop and evaluate filmless quality assurance (QA) tools for helical tomotherapy by using the signals from the on-board megavoltage computed tomography (MVCT) detector and applying a dedicated step-wedge phantom. The step-wedge phantom is a 15 cm long step-like aluminum block positio...

    journal_title:Journal of applied clinical medical physics

    pub_type: 杂志文章

    doi:10.1120/jacmp.v13i1.3585

    authors: Althof V,van Haaren P,Westendorp R,Nuver T,Kramer D,Ikink M,Bel A,Minken A

    更新日期:2012-01-05 00:00:00

  • Evaluation of cumulative dose for cone-beam computed tomography (CBCT) scans within phantoms made from different compositions using Monte Carlo simulations.

    abstract::Measurement of cumulative dose ƒ(0,150) with a small ionization chamber within standard polymethyl methacrylate (PMMA) CT head and body phantoms, 150 mm in length, is a possible practical method for cone-beam computed tomography (CBCT) dosimetry. This differs from evaluating cumulative dose under scatter equilibrium c...

    journal_title:Journal of applied clinical medical physics

    pub_type: 杂志文章

    doi:10.1120/jacmp.v16i6.5793

    authors: Abuhaimed A,Martin CJ,Sankaralingam M,Oomen K,Gentle DJ

    更新日期:2015-11-08 00:00:00