918 resultados para Voxel phantom


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"Edic̦ão crítica de Maria Leonor Machado de Sousa."

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v. 1. Romiero: a tragedy. The alienated manor: a comedy. Henriquez: a tragedy. The martyr: a drama--v. 2. The separation: a tragedy. The stripling: a tragedy ... written in prose. The phantom: a musical drama. Enthusiasm: a comedy.--v. 3. Witchcraft: a tragedy in prose. The homicide: a tragedy in prose, with occasional passages of verse. The bride: a drama. The match: a comedy. Appendix [notes, etc.]

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The princess: a vision of royality in the spheres -- The monomaniac, or, the spirit bride -- The haunted grange, or the last tenant: being an account of the life and times of Mrs. Hannah Morrison, sometimes styled the Witch of Rookwood -- Life: a fragment -- Margaret Infelix, or, a narrative concerning a haunted man -- The improvvisatore, or, torn leaves from life history -- The Witch of Lowenthal -- The phantom mother, or, the story of a recluse -- Haunted houses. No.1. The picture spectres -- Haunted houses. No.2. The Sandford ghost -- Christmas stories. No.1. The stranger guest: an incident founded on fact -- Christmas stories. No.2. Faith, or Mary Macdonald -- The Wildlife Club: a tale founded on fact.

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Short stories.

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--Bertha ; or, The court of Charlemagne.--The last of the Breton kings.--The adventures of Eriland.--The man-wolf.--The king of the beggars.--The serf.--The pilgrim of Saint James.--The bondsman's feast.--The phantom fight.--The magic wand.--The rock of the fort.--The dream-girl.--The black mask ; or, the lottery of jewels.

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v. 1 Soldiers three; In black and white; The story of the Gadsbys; The phantom 'rickshaw and other tales; Wee Willie Winkie and other child stories.--v. 2 The light that failed; Plain tales from the hills.--v. 3 Mine own people; The courting of Dinah Shadd and other stories; American notes; Under the deodars and other tales; Departmental ditties; Barrack-room ballads and other verses.

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Limited ed. of 1000 sets.

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Variant issue: series title on half title; errata slip inserted at p. [ix].

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V. 1. Soldiers three; In black and white; The story of the Gadsbys; The phantom 'rickshaw and other tales; Wee Wille Winkie and other child stories. -- v. 3. Mine own people; The courting of Dinah Shadd and other stories; American notes; Under the deodars and other tales; Departmental ditties; Barrack-room ballads and other verses.

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Thesis (Ph.D.)--University of Washington, 2016-06

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This paper presents an approach to rehabilitation of pain patients. The fundamental principles of the approach are (i) pain is an output of the brain that is produced whenever the brain concludes that body tissue is in danger and action is required, and (ii) pain is a multisystem output that is produced when an individual-specific cortical pain neuromatrix is activated. When pain becomes chronic, the efficacy of the pain neuromatrix is strengthened via nociceptive and non-nociceptive mechanisms, which means that less input, both nociceptive and non-nociceptive, is required to produce pain. The clinical approach focuses on decreasing all inputs that imply that body tissue is in danger and then on activating components of the pain neuromatrix without activating its output. Rehabilitation progresses to increase exposure to threatening input across sensory and non-sensory domains. (C) 2003 Elsevier Ltd. All rights reserved.

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A finite-difference time-domain (FDTD) thermal model has been developed to compute the temperature elevation in the Sprague Dawley rat due to electromagnetic energy deposition in high-field magnetic resonance imaging (MRI). The field strengths examined ranged from 11.75-23.5 T (corresponding to H-1 resonances of 0.5-1 GHz) and an N-stub birdcage resonator was used to both transmit radio-frequency energy and receive the MRI signals. With an in-plane resolution of 1.95 mm, the inhomogeneous rat phantom forms a segmented model of 12 different tissue types, each having its electrical and thermal parameters assigned. The steady-state temperature distribution was calculated using a Pennes 'bioheat' approach. The numerical algorithm used to calculate the induced temperature distribution has been successfully validated against analytical solutions in the form of simplified spherical models with electrical and thermal properties of rat muscle. As well as assisting with the design of MRI experiments and apparatus, the numerical procedures developed in this study could help in future research and design of tumour-treating hyperthermia applicators to be used on rats in vivo.

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This paper evaluates a new, low-frequency finite-difference time-domain method applied to the problem of induced E-fields/eddy currents in the human body resulting from the pulsed magnetic field gradients in MRI. In this algorithm, a distributed equivalent magnetic current is proposed as the electromagnetic source and is obtained by quasistatic calculation of the empty coil's vector potential or measurements therein. This technique circumvents the discretization of complicated gradient coil geometries into a mesh of Yee cells, and thereby enables any type of gradient coil modelling or other complex low frequency sources. The proposed method has been verified against an example with an analytical solution. Results are presented showing the spatial distribution of gradient-induced electric fields in a multi-layered spherical phantom model and a complete body model. (C) 2004 Elsevier Inc. All rights reserved.

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Nuclear magnetic resonance (NMR) spectroscopy and magnetic resonance imaging (MRI) were used to detect petroleum-derived spray oils (PDSOs) in citrus seedlings and trees. The NMR spectrum of the phantom containing 10% (v/v) of a nC24 agricultural mineral oil (AMO) showed the resonance of the water protons at delta = 5 ppm, while the resonance of the oil protons at delta = 1.3 to 1.7 ppm. The peak resolution and the chemical shift difference of more than 3.3 ppm between water and oil protons effectively differentiated water and the oil. Chemical shift selective imaging (CSSI) was performed to localize the AMO within the stems of Citrus trifoliata L. seedlings after the application of a 4% (v/v) spray. The chemical shift selective images of the oil were acquired by excitation at delta = 1.5 ppm by averaging over 400 transients in each phase-encoding step. Oil was mainly detected in the outer cortex of stems within 10 d of spray application; some oil was also observed in the inner vascular bundle and pith of the stems at this point. CSSI was also applied to investigate the persistence of oil deposits in sprayed mature Washington navel orange (Citrus x aurantium L.) trees in an orchard. The trees were treated with either fourteen 0.25%, fourteen 0.5%, four 1.75%, or single 7% sprays of a nC23 horticultural mineral oil (HMO) 12 to 16 months before examination of plant tissues by CSSI, and were still showing symptoms of chronic phytotoxicity largely manifested as reduced yield. The oil deposits were detected in stems of sprayed flushes and unsprayed flushes produced 4 to 5 months after the last spray was applied, suggesting a potential movement of the oil via phloem and a correlation of the persistence of oil deposit in plants and the phytotoxicity. The results demonstrate that MRI is an effective method to probe the uptake and localization of PDSOs and other xenobiotics in vivo in plants noninvasively and nondestructively.

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In magnetic resonance imaging (MRI), the MR signal intensity can vary spatially and this spatial variation is usually referred to as MR intensity nonuniformity. Although the main source of intensity nonuniformity arises from B, inhomogeneity of the coil acting as a receiver and/or transmitter, geometric distortion also alters the MR signal intensity. It is useful on some occasions to have these two different sources be separately measured and analyzed. In this paper, we present a practical method for a detailed measurement of the MR intensity nonuniformity. This method is based on the same three-dimensional geometric phantom that was recently developed for a complete measurement of the geometric distortion in MR systems. In this paper, the contribution to the intensity nonuniformity from the geometric distortion can be estimated and thus, it provides a mechanism for estimation of the intensity nonuniformity that reflects solely the spatial characteristics arising from B-1. Additionally, a comprehensive scheme for characterization of the intensity nonuniformity based on the new measurement method is proposed. To demonstrate the method, the intensity nonuniformity in a 1.5 T Sonata MR system was measured and is used to illustrate the main features of the method. (c) 2005 American Association of Physicists in Medicine.