computed tomography contrast enhancement

... Algorithms for Computed Tomography Gabor T Herman University of Pennsylvania 26.1 26.1 Introduction 26.2 The Reconstruction ... Maximization (EM) 26.9 Comparison of the Performance of Algorithms References Introduction Computed tomography is the process of reconstructing the interiors of objects from data collected based ... measure the radiation transmitted through or emitted from the structure at a number of points Computed tomography (CT) is the process of obtaining from these measurements the distribution of the...

Ngày tải lên: 16/12/2013, 04:15

Ngày tải lên: 09/02/2014, 22:56

... neighboring bone rotation on the various measurements of patellar tilting, through an axial computed tomography study, to help selecting a better measurement for patella tilting and implement ... analysis, comprising a total of 45 subject knees CT imaging All patients were examined with axial computed tomography on both knees in extension, with the quadriceps relaxed as well as contracted according ... FR: femoral rotation; and TR: tibial rotation and minus as internal rotation) As thus axial computed tomography images of patients with PFPS were analyzed to explore the relationship between the...

Ngày tải lên: 20/06/2014, 01:20

... three-dimensional computed tomography scapulas while in the cadaveric group was of 2,35 (ranging from 2,00 to 2,73) The "shortneck" group represented the 41,82% in the three-dimensional computed tomography ... three-dimensional computed tomography and cadaveric scapulas Mean index of length in the "short-neck" group was of 4,80 (ranging from 4,22 to 5,41) for the three-dimensional computed tomography scapulas ... computed tomography scapulas while in the cadaveric group were of 50° (ranging from 49,25° to 55°) Mean type II angle was of 64° (ranging from 60° to 70°) for the three-dimensional computed tomography...

Ngày tải lên: 20/06/2014, 01:20

... (n) 28 II III 24 26 26 IV 5 MDCT: multi-detector computed tomography List of abbreviations CT: Computed Tomography; MDCT: Multi-Detector Computed Tomography; MPR: Multiplanar Reformatted; MIP: ... Soslow RA, Chi DS: Characterization of adnexal masses using feature analysis at contrastenhanced helical computed tomography J Comput Assist Tomogr 2008, 32:533-540 20 Sohaib SA, Sahdev A, Van ... triple phase Precontrast scan of the upper abdomen; arterial phase using the Automatic Bolus Tracking System; portal phase yielded with a delay of 60 s after the arterial one The contrast medium...

Ngày tải lên: 20/06/2014, 08:20

... with a local contrast enhancement algorithm For local contrast enhancement, histogram equalization (HE)-based contrast enhancement algorithms, such as adaptive HE (AHE) [10] and contrast- limited ... adaptive contrast enhancements The adaptive luminance enhancement is employed to compress the dynamic range of the image and the adaptive contrast enhancement is applied to restore the contrast ... image enhancement However, the existent HE-based methods generally produce strong contrast enhancement and may lead to excessive artifacts when processing color images To achieve local contrast enhancement...

Ngày tải lên: 20/06/2014, 22:20

... staged ultrasound and computed tomography pathway Acad Emerg Med 2009, 16:1258-65 28 Hlibczuk V, Dattaro JA, Jin Z, Falzon L, Brown MD: Diagnostic accuracy of noncontrast computed tomography for appendicitis ... abdominal helical computed tomography on the rate of negative appendicitis J Emerg Med 2008, 34:7-11 Gwynn LK: The diagnosis of acute appendicitis: clinical assessment versus computed tomography evaluation ... triple contrast (oral, rectal, and IV) Patients were initially prepped with l of oral and 300 cc of rectal contrast (Bracco Diagnostics Inc., Princeton, NJ), followed by 145 cc of Isovue-300 IV contrast...

Ngày tải lên: 20/06/2014, 23:20

... with a local contrast enhancement algorithm For local contrast enhancement, histogram equalization (HE)-based contrast enhancement algorithms, such as adaptive HE (AHE) [10] and contrast- limited ... adaptive contrast enhancements The adaptive luminance enhancement is employed to compress the dynamic range of the image and the adaptive contrast enhancement is applied to restore the contrast ... image enhancement However, the existent HE-based methods generally produce strong contrast enhancement and may lead to excessive artifacts when processing color images To achieve local contrast enhancement...

Ngày tải lên: 21/06/2014, 00:20

... my pleasure to present the book titled Computed Tomography - Special Applications” Computed tomography (CT) and in particular multi-detector-row computed tomography (MDCT), is a powerful non-invasive ... contused areas and to follow the BBB state in these areas with time 26 Computed Tomography – Special Applications Computed Tomography (CT) scan, the iconographic gold standard to describe acute ... distress syndrome: lessons from computed tomography of the whole lung Crit Care Med;31(4 Suppl):S285-295 Lescot T, Bonnet MP, Zouaoui A, et al.(2005) A quantitative computed tomography assessment of...

Ngày tải lên: 27/06/2014, 17:20

... my pleasure to present the book titled Computed Tomography - Special Applications” Computed tomography (CT) and in particular multi-detector-row computed tomography (MDCT), is a powerful non-invasive ... contused areas and to follow the BBB state in these areas with time 26 Computed Tomography – Special Applications Computed Tomography (CT) scan, the iconographic gold standard to describe acute ... distress syndrome: lessons from computed tomography of the whole lung Crit Care Med;31(4 Suppl):S285-295 Lescot T, Bonnet MP, Zouaoui A, et al.(2005) A quantitative computed tomography assessment of...

Ngày tải lên: 28/06/2014, 00:20

... III Pocket Atlas of Sectional Anatomy Computed Tomography and Magnetic Resonance Imaging Volume II Thorax, Heart, Abdomen, and Pelvis Torsten ... diagnosis is no exception Technical improvements guarantee further developments in diagnosis Computed tomography (CT) and magnetic resonance imaging (MRI) have attained a recognized value in the...

Ngày tải lên: 29/06/2014, 09:21

Ngày tải lên: 29/06/2014, 09:21

Ngày tải lên: 05/08/2014, 15:21

Ngày tải lên: 05/08/2014, 20:21

... 1d) One potential consequence of the bicuculline-caused prolonged excitation was to decrease the contrast between the excitatory phase and the I2 period, thus resulting in a compromised coding ... rate, however, was much higher in C-PNs, suggesting the C-PNs followed the odor pulses with higher contrast under control conditions Nonetheless, application of bicuculline significantly impaired ... showed complete resolution of the repetitive odor pulses by these PNs up to s–1 (Figure 2f) In contrast, the same neurons started to lose odor-pulse tracking even at the rate of s–1 when bicuculline...

Ngày tải lên: 06/08/2014, 18:21

... multidetector row computed tomography (MDCT) and compared the parameters with those of conventional pigs In recent years, major technological improvements have been achieved in computed tomography (CT) ... detected by multidetector row computed tomography (MDCT) and echocardiography in conventional pigs and micropigs EF (%) MDCT (n = 3) Fig Left ventriculogram by computerized tomography (A: end-systolic ... Baum U Detection of coronary artery stenoses by contrast- enhanced, retrospectively electrocardiographically-gated, multislice spiral computed tomography Circulation 2001, 103, 2535-2538 Appel...

Ngày tải lên: 07/08/2014, 20:23

... xenotransplantation, as well as individual patients Fig (A) Contrast enhanced axial computed tomography (CT) images show relatively homogenous enhancement at the level of hepatic vein draining into ... monitoring low-dose scanning (120 kVp, 20 mAs) was initiated four seconds after contrast material injection Contrast material enhancement was automatically calculated by placing the region of interest ... liver and cell systems used to date have been much smaller than the normal human liver [14,28] Computed tomography (CT) is frequently used to evaluate graft size preoperatively in both potential...

Ngày tải lên: 07/08/2014, 23:22

... emission /computed tomography; 18F-FDG: 18F-fluorodeoxyglucose; PET/CT: positron emission /computed tomography; CEA: carcinoembryonic antigen; CA19-9: carbohydrate antigen 19-9; CT: computed tomography; ... provide, is Figure 18F-fluorodeoxyglucose positron emission /computed tomography 18F-fluorodeoxyglucose positron emission /computed tomography demonstrated increased 18F-fluorodeoxyglucose uptake ... increased 18FFDG uptake (maximum standardized uptake value: 3.1) Figure Abdominal computed tomography scan Abdominal computed tomography scan on November 2008 revealed a small nodule in the abdominal...

Ngày tải lên: 09/08/2014, 01:24

... moderate in one case, severe in three patients and no hydrocephalus was present in one case (2) Computed tomography angiography (CTA) was applied to detect tumor staining, venous complex (VC, which ... Neurooncol 2010, 96(2):143-9 doi:10.1186/1477-7819-9-64 Cite this article as: Li et al.: Use of 3D -computed tomography angiography for planning the surgical removal of pineal region meningiomas using ... Neurosurgery 2002, 51(4 Suppl): S53-120 Suzuki Y, Nakajima M, Ikeda H, Abe T: Three-dimensional computed tomography angiography of the galenic system for the occipital transtentorial approach Neurol...

Ngày tải lên: 09/08/2014, 02:20

... documented in both planes (i) Radiography reveals no erosions at the corresponding sites CT, computed tomography; MCP, metacarpophalangeal; MRI, magneticresonance imaging; RA, rheumatoid arthritis; ... impression of the presence of anerosion, with the same configuration as on CT and radiography CT, computed tomography; MCP, metacarpophalangeal; MRI, magnetic resonance imaging; RA, rheumatoid arthritis; ... these modalities reflects true loss of calcified tissue, that is, are true erosions[26,27] Computed tomography (CT) is a tomographic radiographic imaging method that visualizes calcified tissue...

Ngày tải lên: 09/08/2014, 08:22