Detector arrangement and sampling characteristics in rotary positron-emission computed tomography.

Abstract:

:A rotary positron-emission computed tomography system has been proposed in which detectors are mounted unequally spaced on a ring, so as to provide fine and uniform linear sampling during a 360 degree rotation of the ring around its centre. The usefulness of a simple iterative method for searching for a suitable arrangement of detectors is shown, and the dependence of sampling characteristics of such an arrangement on various parameters is clarified. These parameters include the number of detectors I, and the gaps between the adjacent detectors (referred to as angular separations). It is concluded that if the sum total of the angular separations is approximately larger than the angle A subtended at the centre by one detector unit (i.e. if 360 degree -IA greater than or equal to A), a detector arrangement having satisfactory sampling characteristics for positron reconstruction tomography can be determined. Using this iterative method, a 64-detector arrangement of a prototype rotary positron ECT system named POSITOLOGICA was designed and found to be almost optimal under the given conditions.

journal_name

Phys Med Biol

authors

Yamamoto M

doi

10.1088/0031-9155/26/3/011

subject

Has Abstract

pub_date

1981-05-01 00:00:00

pages

489-99

issue

3

eissn

0031-9155

issn

1361-6560

journal_volume

26

pub_type

杂志文章
  • Monte Carlo simulation to evaluate the contamination in an energy modulated carbon ion beam for hadron therapy delivered by cyclotron.

    abstract::Protons and carbon ion beams for hadron therapy can be delivered by cyclotrons with a fixed energy. In order to treat patients, an energy degrader along the beam line will be used to match the particle range with the target depth. Fragmentation reactions of carbon ions inside the degrader material could introduce a sm...

    journal_title:Physics in medicine and biology

    pub_type: 杂志文章

    doi:10.1088/0031-9155/53/21/010

    authors: Morone MC,Calabretta L,Cuttone G,Fiorini F

    更新日期:2008-11-07 00:00:00

  • Thermoluminescent response and relative efficiency of TLD-100 exposed to low-energy x-rays.

    abstract::The dose-response of LiF:Mg,Ti (TLD-100) exposed to 15 and 35 kVp (8.0 +/- 0.1 and 8.1 +/- 0.1 keV effective energy respectively) x-rays and 60Co gamma-rays has been measured in the dose interval from (1.2-5.4) x 10(3) Gy for x-rays, and from 0.14 to 850 Gy for gamma-rays. In both cases the total TL signal and glow cu...

    journal_title:Physics in medicine and biology

    pub_type: 杂志文章

    doi:10.1088/0031-9155/43/8/006

    authors: Gamboa-deBuen I,Buenfil AE,Ruiz CG,Rodríguez-Villafuerte M,Flores A,Brandan ME

    更新日期:1998-08-01 00:00:00

  • Evaluation of the basic properties of the BANGkit gel dosimeter.

    abstract::We evaluated the basic properties of a commercially available BANGkit gel dosimeter, which is a normoxic type of BANG gel. This gel-kit has the same composition as the BANG 3 gel, but is fully oxygenated. To exclude oxygen, oxygen scavenging ascorbic acid and copper sulfate as a catalyst are used. The properties that ...

    journal_title:Physics in medicine and biology

    pub_type: 杂志文章

    doi:10.1088/0031-9155/52/8/017

    authors: Murakami Y,Nakashima T,Watanabe Y,Akimitsu T,Matsuura K,Kenjo M,Kaneyasu Y,Wadasaki K,Hirokawa Y,Ito K

    更新日期:2007-04-21 00:00:00

  • SAR variation study from 300 to 5000 MHz for 15 voxel models including different postures.

    abstract::An extensive study on specific absorption rate (SAR) covering 720 simulations and 15 voxel models (18-105 kg) has been performed by applying the parallel finite-difference time-domain method. High-resolution whole-body models have been irradiated with plane waves from 300 MHz to 5 GHz by applying various incoming dire...

    journal_title:Physics in medicine and biology

    pub_type: 杂志文章

    doi:10.1088/0031-9155/55/4/017

    authors: Uusitupa T,Laakso I,Ilvonen S,Nikoskinen K

    更新日期:2010-02-21 00:00:00

  • Mucosal deformation from an impinging transonic gas jet and the ballistic impact of microparticles.

    abstract::By means of a transonic gas jet, gene guns ballistically deliver microparticle formulations of drugs and vaccines to the outer layers of the skin or mucosal tissue to induce unique physiological responses for the treatment of a range of conditions. Reported high-speed imaging experiments show that the mucosa deforms s...

    journal_title:Physics in medicine and biology

    pub_type: 杂志文章

    doi:10.1088/0031-9155/50/19/010

    authors: Hardy MP,Kendall MA

    更新日期:2005-10-07 00:00:00

  • 2D convolution kernels of ionization chambers used for photon-beam dosimetry in magnetic fields: the advantage of small over large chamber dimensions.

    abstract::This study aims at developing an optimization strategy for photon-beam dosimetry in magnetic fields using ionization chambers. Similar to the familiar case in the absence of a magnetic field, detectors should be selected under the criterion that their measured 2D signal profiles M(x,y) approximate the absorbed dose to...

    journal_title:Physics in medicine and biology

    pub_type: 杂志文章

    doi:10.1088/1361-6560/aab50c

    authors: Looe HK,Delfs B,Poppinga D,Harder D,Poppe B

    更新日期:2018-03-29 00:00:00

  • Temporal backward projection of optoacoustic pressure transients using fourier transform methods.

    abstract::In medical imaging different techniques have been developed to gain information from inside a tissue. Optoacoustics is a method to generate tomography pictures of tissue using Q-switched laser pulses. Due to thermal and pressure confinement, a short light pulse generates a pressure distribution inside tissue, which mi...

    journal_title:Physics in medicine and biology

    pub_type: 杂志文章

    doi:10.1088/0031-9155/46/7/309

    authors: Köstli KP,Frenz M,Bebie H,Weber HP

    更新日期:2001-07-01 00:00:00

  • Modeling silicon diode energy response factors for use in therapeutic photon beams.

    abstract::Silicon diodes have good spatial resolution, which makes them advantageous over ionization chambers for dosimetry in fields with high dose gradients. However, silicon diodes overrespond to low-energy photons, that are more abundant in scatter which increase with large fields and larger depths. We present a cavity-theo...

    journal_title:Physics in medicine and biology

    pub_type: 杂志文章

    doi:10.1088/0031-9155/54/20/007

    authors: Eklund K,Ahnesjö A

    更新日期:2009-10-21 00:00:00

  • Additional factors for the estimation of mean glandular breast dose using the UK mammography dosimetry protocol.

    abstract::The UK and European protocols for mammographic dosimetry use conversion factors that relate incident air kerma to the mean glandular dose (MGD) within the breast. The conversion factors currently used were obtained by computer simulation of a model breast with a composition of 50% adipose and 50% glandular tissues by ...

    journal_title:Physics in medicine and biology

    pub_type: 杂志文章

    doi:10.1088/0031-9155/45/11/308

    authors: Dance DR,Skinner CL,Young KC,Beckett JR,Kotre CJ

    更新日期:2000-11-01 00:00:00

  • Normalized glandular dose (DgN) coefficients from experimental mammographic x-ray spectra.

    abstract::Mean glandular dose is the quantity used for dosimetry in mammography and depends on breast-related characteristics, such as thickness and density, and on the x-ray spectrum used for breast imaging. This work aims to present an experimentally-based method to derive polyenergetic normalized glandular dose coefficients ...

    journal_title:Physics in medicine and biology

    pub_type: 杂志文章

    doi:10.1088/1361-6560/ab171a

    authors: Santos JC,Tomal A,de Barros N,Costa PR

    更新日期:2019-05-10 00:00:00

  • Measurement of the dielectric properties of the epidermis and dermis at frequencies from 0.5 GHz to 110 GHz.

    abstract::Numerous studies have reported the measurements of the dielectric properties of the skin. Clarifying the manner in which the human body interacts with electromagnetic waves is essential for medical research and development, as well as for the safety assessment of electromagnetic wave exposure. The skin comprises sever...

    journal_title:Physics in medicine and biology

    pub_type: 杂志文章

    doi:10.1088/0031-9155/59/16/4739

    authors: Sasaki K,Wake K,Watanabe S

    更新日期:2014-08-21 00:00:00

  • Characterization of a preclinical PET insert in a 7 Tesla MRI scanner: beyond NEMA testing.

    abstract::This study evaluates the performance of the Bruker positron emission tomograph (PET) insert combined with a BioSpec 70/30 USR magnetic resonance imaging (MRI) scanner using the manufacturer acceptance protocol and the NEMA NU 4-2008 for small animal PET. The PET insert is made of 3 rings of 8 monolithic LYSO crystals ...

    journal_title:Physics in medicine and biology

    pub_type: 杂志文章

    doi:10.1088/1361-6560/aba08c

    authors: Gsell W,Molinos C,Correcher C,Belderbos S,Wouters J,Junge S,Heidenreich M,Vande Velde G,Rezaei A,Nuyts J,Cawthorne C,Cleeren F,Nannan L,Deroose CM,Himmelreich U,González Martínez AJ

    更新日期:2020-06-26 00:00:00

  • Automatic T1 bladder tumor detection by using wavelet analysis in cystoscopy images.

    abstract::Correct classification of cystoscopy images depends on the interpreter's experience. Bladder cancer is a common lesion that can only be confirmed by biopsying the tissue, therefore, the automatic identification of tumors plays a significant role in early stage diagnosis and its accuracy. To our best knowledge, the use...

    journal_title:Physics in medicine and biology

    pub_type: 杂志文章

    doi:10.1088/1361-6560/aaa3af

    authors: Freitas NR,Vieira PM,Lima E,Lima CS

    更新日期:2018-02-02 00:00:00

  • Dosimetric characterization of a new miniature multileaf collimator.

    abstract::The dosimetrical characteristics of a new miniature multileaf collimator (ModuLeaf MLC, MRC Systems GmbH, Heidelberg, Germany) attached to the accessory holder of a Siemens accelerator with 6 MV x-rays (PRIMUS, Siemens OCS, Concord, California, USA) have been investigated. In particular, those parameters which are imp...

    journal_title:Physics in medicine and biology

    pub_type: 杂志文章

    doi:10.1088/0031-9155/47/12/402

    authors: Hartmann GH,Föhlisch F

    更新日期:2002-06-21 00:00:00

  • Extension of the NCAT phantom for the investigation of intra-fraction respiratory motion in IMRT using 4D Monte Carlo.

    abstract::The purpose of this work was to create a computational platform for studying motion in intensity modulated radiotherapy (IMRT). Specifically, the non-uniform rational B-spline (NURB) cardiac and torso (NCAT) phantom was modified for use in a four-dimensional Monte Carlo (4D-MC) simulation system to investigate the eff...

    journal_title:Physics in medicine and biology

    pub_type: 杂志文章

    doi:10.1088/0031-9155/55/5/014

    authors: McGurk R,Seco J,Riboldi M,Wolfgang J,Segars P,Paganetti H

    更新日期:2010-03-07 00:00:00

  • Measurement of flow velocity fields in small vessel-mimic phantoms and vessels of small animals using micro ultrasonic particle image velocimetry (micro-EPIV).

    abstract::Determining a multidimensional velocity field within microscale opaque fluid flows is needed in areas such as microfluidic devices, biofluid mechanics and hemodynamics research in animal studies. The ultrasonic particle image velocimetry (EchoPIV) technique is appropriate for measuring opaque flows by taking advantage...

    journal_title:Physics in medicine and biology

    pub_type: 杂志文章

    doi:10.1088/0031-9155/55/20/003

    authors: Qian M,Niu L,Wang Y,Jiang B,Jin Q,Jiang C,Zheng H

    更新日期:2010-10-21 00:00:00

  • Elastostatics of a spherical inclusion in homogeneous biological media.

    abstract::A three-dimensional spherical inclusion model that approximates a lesion bonded to a tissue matrix is proposed for biomedical elastography. Analytical formulae describing spatial strain and stress distributions generated in infinite media by uniform loading are given under a linear, homogeneous, isotropic elasticity a...

    journal_title:Physics in medicine and biology

    pub_type: 杂志文章

    doi:10.1088/0031-9155/43/1/001

    authors: Bilgen M,Insana MF

    更新日期:1998-01-01 00:00:00

  • A complete distortion correction for MR images: II. Rectification of static-field inhomogeneities by similarity-based profile mapping.

    abstract::Radiotherapy treatment planning relies on the use of geometrically correct images. This paper presents a fully automatic tool for correcting MR images for the effects of B(0) inhomogeneities. The post-processing method is based on the gradient-reversal technique of Chang and Fitzpatrick (1992 IEEE Trans. Med. Imaging ...

    journal_title:Physics in medicine and biology

    pub_type: 杂志文章

    doi:10.1088/0031-9155/50/11/014

    authors: Reinsberg SA,Doran SJ,Charles-Edwards EM,Leach MO

    更新日期:2005-06-07 00:00:00

  • Precise measurement of cerebral blood flow in newborn piglets from the bolus passage of indocyanine green.

    abstract::Indocyanine green (ICG) is a near-infrared dye that has the potential to be used as a tracer for the minimally invasive measurement of cerebral blood flow (CBF). In order to examine the technique, the arterial and cerebral concentrations of ICG were measured in newborn piglets during the bolus passage of ICG at normoc...

    journal_title:Physics in medicine and biology

    pub_type: 杂志文章

    doi:10.1088/0031-9155/46/8/312

    authors: Springett R,Sakata Y,Delpy DT

    更新日期:2001-08-01 00:00:00

  • Evaluation of the induced electric field and compliance procedure for a wireless power transfer system in an electrical vehicle.

    abstract::In this study, an induced electric field in a human body is evaluated for the magnetic field leaked from a wireless power transfer system for charging an electrical vehicle. The magnetic field from the wireless power transfer system is modelled computationally, and its effectiveness is confirmed by comparison with the...

    journal_title:Physics in medicine and biology

    pub_type: 杂志文章

    doi:10.1088/0031-9155/58/21/7583

    authors: Laakso I,Hirata A

    更新日期:2013-11-07 00:00:00

  • Rank-shaping regularization of exponential spectral analysis for application to functional parametric mapping.

    abstract::Compartmental models are widely used for the mathematical modelling of dynamic studies acquired with positron emission tomography (PET). The numerical problem involves the estimation of a sum of decaying real exponentials convolved with an input function. In exponential spectral analysis (SA), the nonlinear estimation...

    journal_title:Physics in medicine and biology

    pub_type: 杂志文章

    doi:10.1088/0031-9155/48/23/002

    authors: Turkheimer FE,Hinz R,Gunn RN,Aston JA,Gunn SR,Cunningham VJ

    更新日期:2003-12-07 00:00:00

  • Lasso logistic regression to derive workflow-specific algorithm performance requirements as demonstrated for head and neck cancer deformable image registration in adaptive radiation therapy.

    abstract::As automation in radiation oncology becomes more common, it is important to determine which algorithms are equivalent for a given workflow. Often, algorithm comparisons are performed in isolation; however, clinical context can provide valuable insight into the importance of algorithm features and error magnification i...

    journal_title:Physics in medicine and biology

    pub_type: 杂志文章

    doi:10.1088/1361-6560/ab9fc8

    authors: Weppler S,Schinkel C,Kirkby C,Smith W

    更新日期:2020-09-28 00:00:00

  • Comparison of a finite-element multigroup discrete-ordinates code with Monte Carlo for radiotherapy calculations.

    abstract::Radiotherapy calculations often involve complex geometries such as interfaces between materials of vastly differing atomic number, such as lung, bone and/or air interfaces. Monte Carlo methods have been used to calculate accurately the perturbation effects of the interfaces. However, these methods can be computational...

    journal_title:Physics in medicine and biology

    pub_type: 杂志文章

    doi:10.1088/0031-9155/51/9/010

    authors: Gifford KA,Horton JL,Wareing TA,Failla G,Mourtada F

    更新日期:2006-05-07 00:00:00

  • Automatic classification of dental artifact status for efficient image veracity checks: effects of image resolution and convolutional neural network depth.

    abstract::Enabling automated pipelines, image analysis and big data methodology in cancer clinics requires thorough understanding of the data. Automated quality assurance steps could improve the efficiency and robustness of these methods by verifying possible data biases. In particular, in head and neck (H&N) computed-tomograph...

    journal_title:Physics in medicine and biology

    pub_type: 杂志文章

    doi:10.1088/1361-6560/ab5427

    authors: Welch ML,McIntosh C,Purdie TG,Wee L,Traverso A,Dekker A,Haibe-Kains B,Jaffray DA

    更新日期:2020-01-10 00:00:00

  • Mass-energy absorption coefficient and backscatter factor ratios for kilovoltage x-ray beams.

    abstract::For low-energy (up to 150 kV) x-rays, the ratio of mass-energy absorption coefficients for water to air, (mu(en)/rho)w.air, and the backscatter factor B are used in the conversion of air kerma, measured free-in-air, to water kerma on the surface of a water phantom. For clinical radiotherapy, similar conversion factors...

    journal_title:Physics in medicine and biology

    pub_type: 杂志文章

    doi:10.1088/0031-9155/44/1/011

    authors: Ma CM,Seuntjens JP

    更新日期:1999-01-01 00:00:00

  • A promising new mechanism of ionizing radiation detection for positron emission tomography: modulation of optical properties.

    abstract::Using conventional scintillation detection, the fundamental limit in positron emission tomography (PET) time resolution is strongly dependent on the inherent temporal variances generated during the scintillation process, yielding an intrinsic physical limit for the coincidence time resolution of around 100 ps. On the ...

    journal_title:Physics in medicine and biology

    pub_type: 杂志文章

    doi:10.1088/0031-9155/61/21/7600

    authors: Tao L,Daghighian HM,Levin CS

    更新日期:2016-11-07 00:00:00

  • Monte Carlo optimization of a microbeam collimator design for use on the small animal radiation research platform (SARRP).

    abstract::Microbeam radiation therapy (MRT) is a pre-clinical, spatially-fractionated treatment modality noted for its ability to achieve a large differential response between normal and tumoral tissues. In the present study, TOPAS Monte Carlo (MC) simulations were used to optimize the design of a compact, affordable multi-slit...

    journal_title:Physics in medicine and biology

    pub_type: 杂志文章

    doi:10.1088/1361-6560/aad7e2

    authors: Esplen NM,Chergui L,Johnstone CD,Bazalova-Carter M

    更新日期:2018-08-29 00:00:00

  • The influence of penetrating radiation on collimator performance.

    abstract::Geometric and penetration responses of a multihole focusing collimator to a point source have been determined using a digital computer and a ray tracing technique. Results are presented as point and line spread functions for collimated rays and penetrating rays, and as plane sensitivities and modulation transfer funct...

    journal_title:Physics in medicine and biology

    pub_type: 杂志文章

    doi:10.1088/0031-9155/26/1/011

    authors: Jahns MJ

    更新日期:1981-01-01 00:00:00

  • Inverse treatment planning using volume-based objective functions.

    abstract::The results of optimization of inverse treatment plans depend on a choice of the objective function. Even when the optimal solution for a given cost function can be obtained, a better solution may exist for a given clinical scenario and it could be obtained with a revised objective function. In the approach presented ...

    journal_title:Physics in medicine and biology

    pub_type: 临床试验,杂志文章

    doi:10.1088/0031-9155/49/12/003

    authors: Bednarz G,Michalski D,Anne PR,Valicenti RK

    更新日期:2004-06-21 00:00:00

  • How to harmonize SUVs obtained by hybrid PET/CT scanners with and without point spread function correction.

    abstract::State of the art point-spread function (PSF) corrections implemented in positron emission tomography/computed tomography (PET/CT) reconstruction improved image quality and diagnostic performance but caused an increase in the standardized uptake value (SUV) compared to a conventional OSEM reconstruction system. The EAN...

    journal_title:Physics in medicine and biology

    pub_type: 杂志文章

    doi:10.1088/1361-6560/aaee27

    authors: Ferretti A,Chondrogiannis S,Rampin L,Bellan E,Marzola MC,Grassetto G,Gusella S,Maffione AM,Gava M,Rubello D

    更新日期:2018-11-26 00:00:00