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unenhanced CT

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https://www.readbyqxmd.com/read/28328241/perfusion-ct-in-acute-stroke-effectiveness-of-automatically-generated-colour-maps
#1
Maja Ukmar, Ferruccio Degrassi, Roberta Antea Pozzi Mucelli, Francesca Neri, Fabio Pozzi Mucelli, Maria Assunta Cova
OBJECTIVE: To evaluate the accuracy of perfusion CT (pCT) in the definition of the infarcted core and the penumbra, comparing the data obtained from the evaluation of parametric maps [cerebral blood volume (CBV), cerebral blood flow (CBF) and mean transit time (MTT)] with software-generated colour maps. METHODS: A retrospective analysis was performed to identify patients with suspected acute ischaemic strokes and who had undergone unenhanced CT and pCT carried out within 4...
April 2017: British Journal of Radiology
https://www.readbyqxmd.com/read/28321065/small-bowel-obstruction-caused-by-the-ingestion-of-a-wooden-toothpick-the-ct-findings-and-a-literature-review
#2
Junichi Izumi, Kimihiko Satoh, Wataru Iwasaki, Takaya Miura, Shusei Fujimori
We present a case in which the accidental ingestion of a toothpick caused duodenal perforation and small intestinal obstruction. A 58-year-old man visited our emergency room with acute abdominal pain. Computed tomography (CT) showed obstructive ileus as well as a foreign body penetrating the duodenum, which was identified as a toothpick and removed endoscopically. Unenhanced CT was superior in detecting the object. The patient has been doing well since the operation.
2017: Internal Medicine
https://www.readbyqxmd.com/read/28302592/spectral-detector-ct-for-cardiovascular-applications
#3
Prabhakar Rajiah, Suhny Abbara, Sandra Simon Halliburton
Spectral detector computed tomography (SDCT) is a novel technology that uses two layers of detectors to simultaneously collect low and high energy data. Spectral data is used to generate conventional polyenergetic images as well as dedicated spectral images including virtual monoenergetic and material composition (iodine-only, virtual unenhanced, effective atomic number) images. This paper provides an overview of SDCT technology and a description of some spectral image types. The potential utility of SDCT for cardiovascular imaging and the impact of this new technology on radiation and contrast dose are discussed through presentation of initial patient studies performed on a SDCT scanner...
March 17, 2017: Diagnostic and Interventional Radiology: Official Journal of the Turkish Society of Radiology
https://www.readbyqxmd.com/read/28301779/detection-of-bone-marrow-edema-in-nondisplaced-hip-fractures-utility-of-a-virtual-unenhanced-dual-energy-ct-application
#4
Trenton T Kellock, Savvas Nicolaou, Sandra S Y Kim, Sultan Al-Busaidi, Luck J Louis, Tim W O'Connell, Hugue A Ouellette, Patrick D McLaughlin
Purpose To quantify the sensitivity and specificity of dual-energy computed tomographic (CT) virtual noncalcium images in the detection of nondisplaced hip fractures and to assess whether obtaining these images as a complement to bone reconstructions alters sensitivity, specificity, or diagnostic confidence. Materials and Methods The clinical research ethics board approved chart review, and the requirement to obtain informed consent was waived. The authors retrospectively identified 118 patients who presented to a level 1 trauma center emergency department and who underwent dual-energy CT for suspicion of a nondisplaced traumatic hip fracture...
March 16, 2017: Radiology
https://www.readbyqxmd.com/read/28301210/update-of-dual-energy-ct-applications-in-the-genitourinary-tract
#5
Ravi K Kaza, Lakshmi Ananthakrishnan, Avinash Kambadakone, Joel F Platt
OBJECTIVE: Dual-energy CT (DECT) is being increasingly used for abdominal imaging because it provides incremental benefit of material characterization without significant increase in radiation dose. This article provides an overview of current DECT techniques and use of DECT in urinary tract imaging for assessment of renal masses and urinary calculi characterization and in CT urography. CONCLUSION: Incorporation of DECT into clinical practice and use of its material characterization capabilities in urinary tract imaging enable characterization of urinary calculi and incidental renal lesions and can reduce radiation dose by allowing generation of virtual unenhanced images...
March 16, 2017: AJR. American Journal of Roentgenology
https://www.readbyqxmd.com/read/28298402/early-computed-tomography-modifications-following-bronchial-thermoplasty-in-patients-with-severe-asthma
#6
Marie-Pierre Debray, Marie-Christine Dombret, Marina Pretolani, Gabriel Thabut, Loubna Alavoine, Pierre-Yves Brillet, Camille Taillé, Antoine Khalil, Pascal Chanez, Michel Aubier
Bronchial thermoplasty (BT) is a recent, promising and well-tolerated technique for the treatment of severe asthma. By delivering thermal energy to the airway wall, this procedure can induce early pulmonary opacities seen on computed tomography (CT). We aimed to examine early CT modifications induced by BT and to determine their association with respiratory symptoms.Unenhanced chest CT was performed the day after each BT session in 13 patients with severe asthma, leading to the examination of 38 treated lobes...
March 2017: European Respiratory Journal: Official Journal of the European Society for Clinical Respiratory Physiology
https://www.readbyqxmd.com/read/28287916/the-effect-of-contrast-medium-on-radiation-dose-in-ct-part-ii-a-systematic-evaluation-across-58-patient-models
#7
Pooyan Sahbaee, Ehsan Abadi, W Paul Segars, Daniele Marin, Rendon C Nelson, Ehsan Samei
Purpose To estimate the radiation dose as a result of contrast medium administration in a typical abdominal computed tomographic (CT) examination across a library of contrast material-enhanced computational patient models. Materials and Methods In part II of this study, first, the technique described in part I of this study was applied to enhance the extended cardiac-torso models with patient-specific iodine-time profiles reflecting the administration of contrast material. Second, the patient models were deployed to assess the patient-specific organ dose as a function of time in a typical abdominal CT examination using Monte Carlo simulation...
March 13, 2017: Radiology
https://www.readbyqxmd.com/read/28282598/unenhanced-computed-tomography-for-normal-appendix-detection-comparison-of-low-dose-with-statistical-iterative-reconstruction-and-regular-dose-with-filtered-back-projection
#8
Hwi Ryong Park, Sung Bin Park, Eun Sun Lee, Hyun Jeong Park, Jong Beum Lee, Yang Soo Kim
PURPOSE: To evaluate the differences in visualization of a normal appendix between regular-dose (RD) and low-dose (LD) unenhanced CT. MATERIAL AND METHODS: 179 patients underwent both RDCT and LDCT for urolithiasis. Two reviewers evaluated the appendiceal visualization on a three-point scale. Sensitivities and interobserver agreement were measured. RESULTS: There were no significant differences between RDCT and LDCT in sensitivity, regardless of the reviewer...
March 1, 2017: Clinical Imaging
https://www.readbyqxmd.com/read/28267533/neuroendocrine-liver-metastases-vascular-patterns-on-triple-phase-mdct-are-indicative-of-primary-tumour-location
#9
Maxime Ronot, Francesco Cuccioli, Marco Dioguardi Burgio, Marie-Pierre Vullierme, Olivia Hentic, Philippe Ruszniewski, Gaspard d'Assignies, Valérie Vilgrain
PURPOSE: To re-evaluate and compare CT features of neuroendocrine liver metastases (NLM) from pancreatic (p) and enteric (e) gastroenteropancreatic (GEP) tumours. MATERIAL AND METHODS: From 2006-2013, all patients with proven GEP-neuroendocrine tumours (NETs) with at least one NLM, no previous treatment were included. On unenhanced, arterial and portal phases, NLMs were characterized as hypo-, iso- or hyperattenuating in consensus by 2 radiologists blinded to clinical data...
April 2017: European Journal of Radiology
https://www.readbyqxmd.com/read/28257295/coronary-artery-calcification-detection-with-invasive-coronary-angiography-in-comparison-with-unenhanced-computed-tomography
#10
Joris D van Dijk, Mohammad S Shams, Jan Paul Ottervanger, Mohamed Mouden, Jorn A van Dalen, Pieter L Jager
OBJECTIVE: The presence of extensive coronary artery calcifications (CAC) influences treatment decisions, particularly for revascularization. However, important CAC might be missed with invasive coronary angiography (ICA). Our aim was to determine the accuracy of ICA in the identification of CAC using computed tomography (CT) as reference standard. PATIENTS AND METHODS: Overall, 349 consecutive patients who underwent both CT-based CAC-scoring and invasive coronary angiography within 60 days were retrospectively included...
March 2, 2017: Coronary Artery Disease
https://www.readbyqxmd.com/read/28255810/mdct-and-us-of-intrathoracic-extrapleural-space-soft-tissue-containing-lesions-us-extrapleural-fat-sign-and-mdct-fat-ghost-ribs-sign
#11
Tullio Valente, Giovanni Tortora, Giorgio Bocchini, Gaetano Rea, Maurizio Marino, Maurizio Muto
PURPOSE: The purpose of this study was to review the normal anatomy of the extrapleural space, its soft tissue-containing lesions, and to illustrate the extrapleural fat sign with Multidetector Computed Tomography (MDCT) and Ultrasound (US), which was never described so far. MATERIALS AND METHODS: The study includes 28 patients. 24 with histologically or surgically proven extrapleural soft tissue-containing lesions and 4 pleural lesions. Six patients underwent unenhanced MDCT of the chest, while 22 patients had a contrast-enhanced chest MDCT...
March 3, 2017: La Radiologia Medica
https://www.readbyqxmd.com/read/28249309/iodinated-contrast-media-and-the-alleged-iodine-allergy-an-inexact-diagnosis-leading-to-inferior-radiologic-management-and-adverse-drug-reactions
#12
Ingrid Böhm, Knud Nairz, John N Morelli, Patricia Silva Hasembank Keller, Johannes T Heverhagen
Purpose To test the hypothesis that the incomplete diagnosis "iodine allergy" is a possibly dangerous concept for patients under routine radiologic conditions. Materials and Methods 300 patients with a history of an "iodine allergy" were retrospectively screened and compared with two age-, sex-, and procedure-matched groups of patients either diagnosed with a nonspecific "iodine contrast medium (ICM) allergy" or an allergy to a specific ICM agent. For all groups, the clinical symptoms of the most recent past adverse drug reaction (ADR), prophylactic actions taken for subsequent imaging, and ultimate outcome were recorded and analyzed...
April 2017: RöFo: Fortschritte Auf Dem Gebiete der Röntgenstrahlen und der Nuklearmedizin
https://www.readbyqxmd.com/read/28245141/detecting-intracranial-hemorrhage-using-automatic-tube-current-modulation-with-advanced-modeled-iterative-reconstruction-in-unenhanced-head-single-and-dual-energy-dual-source-ct
#13
Jan-Erik Scholtz, Julian L Wichmann, Dennis W Bennett, Doris Leithner, Ralf W Bauer, Thomas J Vogl, Boris Bodelle
OBJECTIVE: The purpose of our study was to determine diagnostic accuracy, image quality, and radiation dose of low-dose single- and dual-energy unenhanced third-generation dual-source head CT for detection of intracranial hemorrhage (ICH). MATERIALS AND METHODS: A total of 123 patients with suspected ICH were examined using a dual-source 192-MDCT scanner. Standard-dose 120-kVp single-energy CT (SECT; n = 36) and 80-kVp and 150-kVp dual-energy CT (DECT; n = 30) images were compared with low-dose SECT (n = 32) and DECT (n = 25) images obtained using automated tube current modulation (ATCM)...
February 28, 2017: AJR. American Journal of Roentgenology
https://www.readbyqxmd.com/read/28243764/the-spectrum-of-traumatic-injuries-at-the-craniocervical-junction-a-review-of-imaging-findings-and-management
#14
Juveria Siddiqui, Patrick J Grover, Hegoda Levansri Makalanda, Thomas Campion, Jonathan Bull, Ashok Adams
The craniocervical junction is an area with unique biomechanical properties and injuries conferred often represent high-impact trauma. The vital structures traversing this region are susceptible to injury with frequent, only subtle findings identified on unenhanced CT, with MRI and CT angiography often revealing the full extent of injuries. This article reviews the osseous and ligamentous anatomy of the region and common injury patterns. Endovascular and neurosurgical management will also be discussed.
February 27, 2017: Emergency Radiology
https://www.readbyqxmd.com/read/28236645/an-effective-noise-reduction-method-for-multi-energy-ct-images-that-exploits-spatio-spectral-features
#15
Zhoubo Li, Shuai Leng, Lifeng Yu, Armando Manduca, Cynthia H McCollough
PURPOSE: To develop and evaluate an image-domain noise reduction method for multi-energy CT (MECT) data. METHODS: Multi-Energy Non-Local Means (MENLM) is a technique that uses the redundant information in MECT images to achieve noise reduction. In this method, spatio-spectral features are used to determine the similarity between pixels, making the similarity evaluation more robust to image noise. The performance of this MENLM filter was tested on images acquired on a whole-body research photon counting CT system...
February 25, 2017: Medical Physics
https://www.readbyqxmd.com/read/28230568/obesity-hepatic-steatosis-and-their-impact-on-fat-infiltration-of-the-trunk-musculature-using-unenhanced-computed-tomography
#16
Ronnie Sebro
OBJECTIVES: The aim of the study was to assess whether hepatic steatosis predicts muscle fat content independent of body mass index (BMI). METHODS: Regions of interest were drawn over several trunk muscles and over the right lobe of the liver to obtain the computed tomography (CT) density in 100 subjects with unenhanced CT studies of the abdomen and pelvis. Univariate and multivariate linear regression were used to examine the associations between BMI and hepatic steatosis and between BMI and trunk muscle density...
March 2017: Journal of Computer Assisted Tomography
https://www.readbyqxmd.com/read/28225653/update-on-ct-and-mri-of-adrenal-nodules
#17
Nicola Schieda, Evan S Siegelman
OBJECTIVE: The objective of this article is to review the current role of CT and MRI for the characterization of adrenal nodules. CONCLUSION: Unenhanced CT and chemical-shift MRI have high specificity for lipid-rich adenomas. Dual-energy CT provides comparable to slightly lower sensitivity for the diagnosis of lipid-rich adenomas but may improve characterization of lipid-poor adenomas. Nonadenomas containing intracellular lipid pose an imaging challenge; however, nonadenomas that contain lipid may be potentially diagnosed using other imaging features...
February 22, 2017: AJR. American Journal of Roentgenology
https://www.readbyqxmd.com/read/28215550/evaluation-of-unenhanced-post-mortem-computed-tomography-to-detect-chest-injuries-in-violent-death
#18
I Sifaoui, C Nedelcu, G Beltran, V Dupont, J Lebigot, A Gaudin, C Ridereau Zins, C Rouge Maillard, C Aubé
PURPOSE: The aim of this study was to assess the performances of unenhanced post-mortem computed tomography (CT) to detect thoracic injuries in violent death. MATERIALS AND METHODS: Retrospectively, we conducted a review of unenhanced CT scans of 67 victims of violent deaths with thoracic injuries and compared CT findings with the results of clinical autopsy. Our gold standard was a comparison of CT scans with autopsy discussed in a monthly forensic radiology multidisciplinary team meeting (MDTM)...
February 16, 2017: Diagnostic and Interventional Imaging
https://www.readbyqxmd.com/read/28213826/diagnostic-yield-of-ct-urography-in-the-evaluation-of-hematuria-in-young-patients-in-a-military-population
#19
Laura R Mace, Terrel L Galloway, Andrew Ma, Richard S Montgomery, Ryan C Rockhill, William W Reynolds, Robert M Marks
PURPOSE: To assess the diagnostic yield of a computed tomography urography (CTU) study in patients less than 50 years of age, who have a history of military service, and who are at increased risk of urological cancers secondary to harmful practices and work-related exposures. METHODS: 137 Consecutive patients who underwent CTU between 2012 and 2013 for new onset of hematuria were included. Initial review of the clinical interpretations of the CTU studies grouped the studies into negative and positive exams for any urological findings...
February 17, 2017: Abdominal Radiology
https://www.readbyqxmd.com/read/28213620/post-contrast-acute-kidney-injury-in-intensive-care-unit-patients-a-propensity-score-adjusted-study
#20
Jennifer S McDonald, Robert J McDonald, Eric E Williamson, David F Kallmes, Kianoush Kashani
PURPOSE: To examine the association of intravenous iodinated contrast material administration with the subsequent development of post-contrast AKI (PC-AKI), emergent dialysis, and short-term mortality using a propensity score-adjusted analysis of a cohort of intensive care unit (ICU) patients who underwent CT examination. METHODS: All ICU patients at our institution who received a contrast-enhanced (contrast group) or unenhanced (noncontrast group) CT scan from January 2006 to December 2014 were identified...
February 17, 2017: Intensive Care Medicine
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