keyword
MENU ▼
Read by QxMD icon Read
search

unenhanced CT

keyword
https://www.readbyqxmd.com/read/29667885/radiomics-approach-to-prediction-of-occult-mediastinal-lymph-node-metastasis-of-lung-adenocarcinoma
#1
Yan Zhong, Mei Yuan, Teng Zhang, Yu-Dong Zhang, Hai Li, Tong-Fu Yu
OBJECTIVE: The purpose of this study was to evaluate the prognostic impact of radiomic features from CT scans in predicting occult mediastinal lymph node (LN) metastasis of lung adenocarcinoma. MATERIALS AND METHODS: A total of 492 patients with lung adenocarcinoma who underwent preoperative unenhanced chest CT were enrolled in the study. A total of 300 radiomics features quantifying tumor intensity, texture, and wavelet were extracted from the segmented entire-tumor volume of interest of the primary tumor...
April 18, 2018: AJR. American Journal of Roentgenology
https://www.readbyqxmd.com/read/29660928/adrenal-schwannoma-ct-mr-manifestations-and-pathological-correlation
#2
Wei Tang, Xiang-Rong Yu, Liang-Ping Zhou, Hong-Bo Gao, Qi-Feng Wang, Wei-Jun Peng
OBJECTIVES: This study aimed to describe the computed tomography (CT), magnetic resonance imaging (MRI) imaging features of adrenal schwannoma and to correlate imaging findings with histopathologic findings. METHODS: The findings from multiphase CT or MRI examinations of seventeen patients with histopathologically confirmed adrenal schwannoma were reviewed. The imaging criteria included shape, size, margin, attenuation, signal intensity, secondary degeneration, and internal mass enhancement pattern...
2018: Clinical Hemorheology and Microcirculation
https://www.readbyqxmd.com/read/29644441/-11-c-acetate-pet-as-a-tool-for-diagnosis-of-liver-steatosis
#3
Marzieh Nejabat, Asha Leisser, Georgios Karanikas, Wolfgang Wadsak, Markus Mitterhauser, Marius Mayerhöfer, Christian Kienbacher, Michael Trauner, Marcus Hacker, Alexander R Haug
PURPOSE: To investigate [11 C]acetate PET-surrogate parameter of fatty acid synthase activity-as suitable tool for diagnosis and monitoring of liver steatosis. METHODS: In this retrospective study, data were obtained from 83 prostatic carcinoma patients from 1/2008 to 1/2014. Mean HU was calculated from unenhanced CT of all patients from liver with liver HU less than 40 as threshold for liver steatosis. SUVmax of the liver and of the blood pool in thoracic aorta (as background for calculation of a liver/background ratio [SUVl/b ]) was measured...
April 11, 2018: Abdominal Radiology
https://www.readbyqxmd.com/read/29611401/low-dose-unenhanced-computed-tomography-with-iterative-reconstruction-for-diagnosis-of-ureter-stones
#4
Byung Hoon Chi, In Ho Chang, Dong Hoon Lee, Sung Bin Park, Kyung Do Kim, Young Tae Moon, Tae Kye Huh
PURPOSE: To study the clinical application of low-dose unenhanced computed tomography with iterative reconstruction technique (LDCT-IR) on renal colic in the emergency department. MATERIALS AND METHODS: We conducted a prospective, single-blinded, randomized, and non-inferiority study. From March 2014 to August 2015, 112 patients with renal colic were included, and were randomized to either LDCT-IR (n=46) or standard-dose unenhanced CT (SDCT) (n=66) groups. The accuracy of urolithiasis diagnosis was the primary endpoint of this study...
May 2018: Yonsei Medical Journal
https://www.readbyqxmd.com/read/29606371/characterization-of-small-4cm-solid-renal-masses-by-computed-tomography-and-magnetic-resonance-imaging-current-evidence-and-further-development
#5
N Schieda, R S Lim, M D F McInnes, I Thomassin, R Renard-Penna, S Tavolaro, F H Cornelis
Diagnosis of renal cell carcinomas (RCC) subtypes on computed tomography (CT) and magnetic resonance imaging (MRI) is clinically important. There is increased evidence that confident imaging diagnosis is now possible while standardization of the protocols is still required. Fat-poor angiomyolipoma show homogeneously increased unenhanced attenuation, homogeneously low signal on T2-weighted MRI and apparent diffusion coefficient (ADC) map, may contain microscopic fat and are classically avidly enhancing. Papillary RCC are also typically hyperattenuating and of low signal on T2-weighted MRI and ADC map; however, their gradual progressive enhancement after intravenous administration of contrast material is a differentiating feature...
March 30, 2018: Diagnostic and Interventional Imaging
https://www.readbyqxmd.com/read/29558304/case-252-acute-hyperammonemic-encephalopathy-resulting-from-late-onset-ornithine-transcarbamylase-deficiency
#6
Michelle Hershman, Raymond Carmody, Unni K Udayasankar
History A 19-year-old woman with no pertinent medical history was brought to the emergency department after being found unconscious on her bathroom floor by her roommate. In the preceding weeks, she had reported intractable nausea and vomiting, for which she had been taking ondansetron. No other medications had been prescribed. The day prior to presentation, she had contacted her mother and described increasing confusion. Glasgow coma scale score on arrival in the emergency department was 4. Intravenous naloxone was administered, without immediate response...
April 2018: Radiology
https://www.readbyqxmd.com/read/29549202/can-virtual-autopsy-with-postmortem-ct-improve-clinical-diagnosis-of-cause-of-death-a-retrospective-observational-cohort-study-in-a-dutch-tertiary-referral-centre
#7
Lianne J P Sonnemans, Bela Kubat, Mathias Prokop, Willemijn M Klein
OBJECTIVE: To investigate whether virtual autopsy with postmortem CT (PMCT) improves clinical diagnosis of the immediate cause of death. DESIGN: Retrospective observational cohort study. INCLUSION CRITERIA: inhospital and out-of-hospital deaths over the age of 1 year in whom virtual autopsy with PMCT and conventional autopsy were performed. EXCLUSION CRITERIA: forensic cases, postmortal organ donors and cases with incomplete scanning procedures...
March 16, 2018: BMJ Open
https://www.readbyqxmd.com/read/29547057/energy-specific-optimization-of-attenuation-thresholds-for-low-energy-virtual-monoenergetic-images-in-renal-lesion-evaluation
#8
Bhavik N Patel, Alfredo Farjat, Christoph Schabel, Petar Duvnjak, Achille Mileto, Juan Carlos Ramirez-Giraldo, Daniele Marin
OBJECTIVE: The purpose of this study was to determine in vitro and in vivo the optimal threshold for renal lesion vascularity at low-energy (40-60 keV) virtual monoenergetic imaging. MATERIALS AND METHODS: A rod simulating unenhanced renal parenchymal attenuation (35 HU) was fitted with a syringe containing water. Three iodinated solutions (0.38, 0.57, and 0.76 mg I/mL) were inserted into another rod that simulated enhanced renal parenchyma (180 HU). Rods were inserted into cylindric phantoms of three different body sizes and scanned with single- and dual-energy MDCT...
March 16, 2018: AJR. American Journal of Roentgenology
https://www.readbyqxmd.com/read/29547054/diagnostic-accuracy-of-unenhanced-ct-analysis-to-differentiate-low-grade-from-high-grade-chromophobe-renal-cell-carcinoma
#9
Nicola Schieda, Robert S Lim, Satheesh Krishna, Matthew D F McInnes, Trevor A Flood, Rebecca E Thornhill
OBJECTIVE: The objective of our study was to evaluate tumor attenuation and texture on unenhanced CT for potential differentiation of low-grade from high-grade chromophobe renal cell carcinoma (RCC). MATERIALS AND METHODS: A retrospective study of 37 consecutive patients with chromophobe RCC (high-grade, n = 13; low-grade, n = 24) who underwent preoperative unenhanced CT between 2011 and 2016 was performed. Two radiologists (readers 1 and 2) blinded to the histologic grade of the tumor and outcome of the patients subjectively evaluated tumor homogeneity (3-point scale: completely homogeneous, mildly heterogeneous, or mostly heterogeneous)...
March 16, 2018: AJR. American Journal of Roentgenology
https://www.readbyqxmd.com/read/29536769/clinical-and-imaging-features-of-kaposiform-hemangioendothelioma
#10
Pei-An Hu, Zheng-Rong Zhou
PURPOSES: Kaposiform hemangioendothelioma (KHE) is a unique locally aggressive vascular tumor with poor prognosis. The aim of this study is to assess the clinical and imaging features of KHE, and to compare the differences between solitary and diffusive infiltrative subtype further. METHODS: The clinical and radiological findings of a cohort of 25 cases with histologically proven KHE, between June 2011 and June 2016, were reviewed retrospectively. Seven solitary and 18 diffusive infiltrative subtypes KHE were included...
March 14, 2018: British Journal of Radiology
https://www.readbyqxmd.com/read/29528711/abdominal-attenuation-values-on-virtual-and-true-unenhanced-images-obtained-with-third-generation-dual-source-dual-energy-ct
#11
Pierre Durieux, Pierre Alain Gevenois, Alain Van Muylem, Nigel Howarth, Caroline Keyzer
OBJECTIVE: The purpose of this study is to investigate the magnitude of differences between attenuation values measured on virtual unenhanced images and true unenhanced images obtained using third-generation dual-source dual-energy CT (DECT). SUBJECTS AND METHODS: A total of 83 patients requiring thoracoabdominal CT for cancer workup were included in this prospective study. CT examinations included true unenhanced acquisitions (tube potential, 120 kVp) and arterial and portal phase dual-energy CT (DECT) acquisitions (tube potential, 100 kVp and Sn 150 kVp [where Sn denotes the interposition of a tin filter in the high-energy beam]; tube current-exposure time product, 190 and 95 mAs)...
March 12, 2018: AJR. American Journal of Roentgenology
https://www.readbyqxmd.com/read/29502881/head-imaging-in-suspected-non-accidental-injury-in-the-paediatric-population-in-the-advent-of-volumetric-ct-imaging-has-the-skull-x-ray-become-redundant
#12
S R Sharp, S M Patel, R E Brown, C Landes
AIM: To assess whether the inclusion of skull radiography, as part of the skeletal survey performed in suspected non-accidental injury (NAI), is still justified when volume computed tomography (CT) of the head has also been performed. MATERIALS AND METHODS: This was a retrospective study which included 94 patients aged between 24 days and 23 months who presented to the Emergency Department between August 2014 to July 2016 and had subsequent investigations for suspected NAI...
March 1, 2018: Clinical Radiology
https://www.readbyqxmd.com/read/29496084/quantitative-computed-tomography-texture-analyses-for-anterior-mediastinal-masses-differentiation-between-solid-masses-and-cysts
#13
Koichiro Yasaka, Hiroyuki Akai, Osamu Abe, Kuni Ohtomo, Shigeru Kiryu
OBJECTIVES: To investigate whether solid anterior mediastinal masses could be differentiated from cysts using quantitative computed tomography (CT) texture analyses in unenhanced CT (UECT) or contrast enhanced CT (CECT). MATERIALS AND METHODS: This clinical retrospective study included 76 UECT images (40 men and 36 women, 28 cystic (mean diameter, 29.5 mm) and 48 solid (mean diameter, 48.2 mm)) and 84 CECT images (45 men and 39 women, 26 cystic (mean diameter, 31...
March 2018: European Journal of Radiology
https://www.readbyqxmd.com/read/29494949/usefulness-of-unenhanced-post-mortem-computed-tomography-findings-in-postmortem-non-contrast-computed-tomography-of-the-head-neck-and-spine-compared-to-traditional-medicolegal-autopsy
#14
Gil Graziani, Sigal Tal, Adi Adelman, Chen Kugel, Tali Bdolah-Abram, Alon Krispin
INTRODUCTION/BACKGROUND: Post-mortem CT (PMCT) is becoming an essential tool available to forensic pathologists worldwide, but its validity with respect to evidence for legal purposes still requires more comprehensive large-scale studies, comparing PMCT to autopsy. This article compares PMCT and autopsy findings of the head, neck, and spine during a period of five years. MATERIALS AND METHODS: The study included 203 cases for which both autopsy and PMCT were performed...
February 26, 2018: Journal of Forensic and Legal Medicine
https://www.readbyqxmd.com/read/29489868/quantification-of-abdominal-aortic-calcification-inherent-measurement-errors-in-current-computed-tomography-imaging
#15
Ruben V C Buijs, Eva L Leemans, Marcel Greuter, Ignace F J Tielliu, Clark J Zeebregts, Tineke P Willems
OBJECTIVE: Quantification software for coronary calcification is often used to measure abdominal aortic calcification on computed tomography (CT) images. However, there is no evidence substantiating the reliability and accuracy of these tools in this setting. Differences in coronary and abdominal CT acquisition and presence of intravascular contrast may affect the results of these tools. Therefore, this study investigates the effects of CT acquisition parameters and iodine contrast on automated quantification of aortic calcium on CT...
2018: PloS One
https://www.readbyqxmd.com/read/29476214/comparison-of-ultrasound-versus-computed-tomography-for-the-detection-of-kidney-stones-in-the-pediatric-population-a-clinical-effectiveness-study
#16
Nathaniel P Roberson, Jonathan R Dillman, Sara M O'Hara, William R DeFoor, Pramod P Reddy, Richard M Giordano, Andrew T Trout
BACKGROUND: The incidence of pediatric nephrolithiasis in the United States is increasing. There is a paucity of literature comparing the diagnostic performance of computed ultrasound (US) to tomography (CT) in the pediatric population. OBJECTIVE: To determine the diagnostic performance of renal US for nephrolithiasis in children using a clinical effectiveness approach. MATERIALS AND METHODS: Institutional review board approval with a waiver of informed consent was obtained for this retrospective, HIPAA-complaint investigation...
February 23, 2018: Pediatric Radiology
https://www.readbyqxmd.com/read/29474537/diagnostic-accuracy-of-postmortem-computed-tomography-magnetic-resonance-imaging-and-computed-tomography-guided-biopsies-for-the-detection-of-ischaemic-heart-disease-in-a-hospital-setting
#17
Ivo M Wagensveld, Britt M Blokker, Andrea Pezzato, Piotr A Wielopolski, Nomdo S Renken, Jan H von der Thüsen, Gabriel P Krestin, M G Myriam Hunink, J Wolter Oosterhuis, Annick C Weustink
Aims: The autopsy rate worldwide is alarmingly low (0-15%). Mortality statistics are important, and it is, therefore, essential to perform autopsies in a sufficient proportion of deaths. The imaging autopsy, non-invasive, or minimally invasive autopsy (MIA) can be used as an alternative to the conventional autopsy in an attempt to improve postmortem diagnostics by increasing the number of postmortem procedures. The aim of this study was to determine the diagnostic accuracy of postmortem magnetic resonance imaging (MRI), computed tomography (CT), and CT-guided biopsy for the detection of acute and chronic myocardial ischaemia...
February 20, 2018: European Heart Journal Cardiovascular Imaging
https://www.readbyqxmd.com/read/29470937/renal-lesion-characterization-with-spectral-ct-determining-the-optimal-energy-for-virtual-monoenergetic-reconstruction
#18
Christoph Schabel, Bhavik Patel, Scott Harring, Petar Duvnjak, Juan Carlos Ramírez-Giraldo, Konstantin Nikolaou, Rendon C Nelson, Alfredo E Farjat, Daniele Marin
Purpose To investigate the relationship between energy level of virtual monoenergetic (VM) imaging and sensitivity in the detection of minimally enhancing renal lesions. Materials and Methods Phantoms simulating unenhanced and contrast material-enhanced renal parenchyma were equipped with inserts containing different concentrations of iodine (range, 0-1.15 mg iodine per milliliter). A total of 180 patients (117 men; mean age, 65.2 years ± 13.0 [standard deviation]) with 194 (62 solid, 132 cystic) renal lesions larger than 10 mm in diameter underwent unenhanced single-energy CT and contrast-enhanced dual-energy CT...
February 22, 2018: Radiology
https://www.readbyqxmd.com/read/29470157/solid-small-renal-mass-without-gross-fat-ct-criteria-for-achieving-excellent-positive-predictive-value-for-renal-cell-carcinoma
#19
Sung Yoon Park, Su-Jin Shin, Nam Hoon Cho, Dae Chul Jung, Koon Ho Rha, Woong Kyu Han, Young Taik Oh
OBJECTIVE: The purpose of this study was to evaluate CT criteria for achieving high positive predictive value (PPV) for renal cell carcinoma (RCC) in patients with solid small renal masses (SRMs) less than 4 cm without macroscopic fat. MATERIALS AND METHODS: One hundred fifty consecutive patients with a solid SRM without macroscopic fat (mean size ± SD, 2.5 ± 0.8 cm) who underwent CT including unenhanced, corticomedullary (CMP), and nephrographic phases (NP) were evaluated...
February 22, 2018: AJR. American Journal of Roentgenology
https://www.readbyqxmd.com/read/29467231/diagnostic-accuracy-of-computed-tomography-to-identify-adenomas-and-benign-tumors-amongst-adrenal-incidentalomas-in-an-endocrinological-population
#20
Marie Marty, Delphine Gaye, Paul Perez, Claire Auder, Marie-Laure Nunes, Amandine Ferriere, Magalie Haissaguerre, Antoine Tabarin
CONTEXT: the recent recommendations of the European endocrine society states that the performance of computed tomography (CT) to characterize true adrenal incidentalomas (AIs) remains debatable. OBJECTIVE: to determine relevant thresholds for usual CT parameters for the diagnosis of benign tumors using robust reference standard amongst a large series of "true" AIs recruited in an endocrinological setting. DESIGN: retrospective study of 253 AIs in 233 consecutive patients explored in a single university hospital: 183 adenomas, 33 pheochromocytomas, 23 adrenocortical carcinomas, 5 other malignant tumors and 9 other benign tumors...
February 21, 2018: European Journal of Endocrinology
keyword
keyword
1724
1
2
Fetch more papers »
Fetching more papers... Fetching...
Read by QxMD. Sign in or create an account to discover new knowledge that matter to you.
Remove bar
Read by QxMD icon Read
×

Search Tips

Use Boolean operators: AND/OR

diabetic AND foot
diabetes OR diabetic

Exclude a word using the 'minus' sign

Virchow -triad

Use Parentheses

water AND (cup OR glass)

Add an asterisk (*) at end of a word to include word stems

Neuro* will search for Neurology, Neuroscientist, Neurological, and so on

Use quotes to search for an exact phrase

"primary prevention of cancer"
(heart or cardiac or cardio*) AND arrest -"American Heart Association"