Results 231 to 240 of about 2,215,491 (268)

Decomposing the Hounsfield Unit

Clinical Neuroradiology, 2012
The aim of this study was to present and evaluate a standardized technique for brain segmentation of cranial computed tomography (CT) using probabilistic partial volume tissue maps based on a database of high resolution T1 magnetic resonance images (MRI).Probabilistic tissue maps of white matter (WM), gray matter (GM) and cerebrospinal fluid (CSF) were
A, Kemmling, H, Wersching, K, Berger, S, Knecht, C, Groden, I, Nölte   +5 more
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Spectral Hounsfield units: a new radiological concept

European Radiology, 2011
Computed tomography (CT) uses radiographical density to depict different materials; although different elements have different absorption fingerprints across the range of diagnostic X-ray energies, this spectral absorption information is lost in conventional CT.
Michael Anthony, Hurrell, Anthony Philip Howard, Butler, Nicholas James, Cook, Philip Howard, Butler, J Paul, Ronaldson, Rafidah, Zainon   +5 more
openaire   +2 more sources

Hounsfield unit density in the determination of urinary stone composition

Urology, 2001
Noncontrast computed tomography (NCCT) has emerged as the diagnostic study of choice in the evaluation of acute flank pain. Recent in vitro studies have suggested that NCCT can be used to predict the composition of urinary stones on the basis of differences in radiodensity (measured in Hounsfield units, HUs). We sought to determine whether the analysis
G, Motley, N, Dalrymple, C, Keesling, J, Fischer, W, Harmon   +4 more
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The calibration of CT Hounsfield units for radiotherapy treatment planning

Physics in Medicine and Biology, 1996
Computer tomographic (CT) scans are used to correct for tissue inhomogeneities in radiotherapy treatment planning. In order to guarantee a precise treatment, it is important to obtain the relationship between CT Hounsfield units and electron densities (or proton stopping powers for proton radiotherapy), which is the basic input for radiotherapy ...
Schneider, Uwe, Pedroni, Eros, Lomax, Antony   +2 more
openaire   +3 more sources

Hounsfield units variations

Strahlentherapie und Onkologie, 2013
Determination of dose error margins in radiation therapy planning due to variations in Hounsfield Units (HU) values dependent on the use of different CT scanning protocols.Based on a series of different CT scanning protocols used in clinical practice, conversion tables for radiation dose calculations were generated and subsequently tested on a phantom.
B, Zurl, R, Tiefling, P, Winkler, P, Kindl, K S, Kapp   +4 more
openaire   +2 more sources

Determination of the Urinary Stone Chemical Composition Using the Hounsfield Unit

Urologia Journal, 2009
Objectives To determine the chemical composition of pure and mixed urinary calculi by multislice helical computed tomography (CT) in an in-vitro setting. CT is becoming the preferred radiologic examination in diagnosis and management of calculus disease. The management of calculus disease can be facilitated by ascertaining stone composition.
G, Marchioro, M, Vidali, G, Bellomo, M, Billa Michele, G, Maso, F, Varvello, M, Zacchero, G, Ceratti, A, Volpe, C, Terrone   +9 more
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The superiority of endplate Hounsfield units relative to cervical vertebral Hounsfield units in predicting subsidence after anterior cervical discectomy and fusion

Journal of Neurosurgery: Spine
OBJECTIVE The present investigation aimed to 1) develop a new CT-based assessment of endplate bone density (endplate Hounsfield unit [EP-HU]) and 2) analyze if EP-HU was a better predictor than vertebral Hounsfield unit (HU) for subsidence after anterior cervical discectomy and fusion (ACDF).
Hannah A, Levy, Maria D, Astudillo Potes, Caden J, Messer, Christopher A, Magera, Zachariah W, Pinter, Mohamad, Bydon, Jeremy L, Fogelson, Benjamin D, Elder, Bradford L, Currier, Ahmad N, Nassr, Brett A, Freedman, Brian A, Karamian, Arjun S, Sebastian   +12 more
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Effective use of the Hounsfield unit in the age of variable energy CT

Abdominal Radiology, 2017
The increasing use of dual-energy computed tomography (CT) and of reduced kVp protocols exposes the marked energy dependence of the Hounsfield unit (HU) as a measure of X-ray attenuation. This dependence of HU on energy limits its use as a quantitative diagnostic parameter, potentially leading to inaccurate diagnoses.To describe a method for annotating
David Bolus, Desiree Morgan, Lincoln Berland   +2 more
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Diagnostic Accuracy of Knee CT Hounsfield Units for Osteopenia and Osteoporosis

Bone and Joint Journal
AimsDiagnostic accuracy of knee CT Hounsfield units (HUs) for bone mineral density remains unclear. This study assessed diagnostic accuracy of regional knee CT HU for osteopenia and osteoporosis in a consecutive institutional cohort, while controlling for CT energy.MethodsA search was conducted at the study institution for all patients aged ≥ 50 years ...
Elizabeth B Gausden, Craig E Klinger, Ashley A Weaver   +2 more
exaly   +3 more sources

Hounsfield Units ranges in CT-scans of bog bodies and mummies

Anthropologischer Anzeiger, 2012
Mummification processes, either artificial or natural, preserve the tissues from postmortem decay, but change them from their original state. In this study we provided the first comprehensive set of Hounsfield Unit (HU) ranges specific for tissues mummified under different environmental conditions (peat bog, cold-dry and hot-dry environment).
Villa, Chiara, Lynnerup, Niels
openaire   +3 more sources