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Investigative Radiology

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https://www.readbyqxmd.com/read/28727616/iterative-reconstruction-may-improve-diagnosis-of-gout-an-ex-vivo-bio-phantom-dual-energy-computed-tomography-study
#1
Torsten Diekhoff, Maximilian Kotlyarov, Jürgen Mews, Bernd Hamm, Kay Geert Hermann
OBJECTIVES: We hypothesize that, compared with filtered back projection (FBP), iterative reconstruction (IR) increases the detected volume of uric acid, which serves as a measure of the sensitivity of the method, and therefore allows examinations with lower radiation exposure. Thus, the aim of our study was to evaluate the role of IR in dual-energy computed tomography (DECT) for gout assessment and volumetry in an ex vivo gout model using an epoxy phantom and a biophantom. MATERIALS AND METHODS: We prepared specimens with different concentrations of monosodium uric acid in ultrasound gel (30%-50%) and inserted them into an epoxy-based phantom and a porcine foreleg...
October 17, 2017: Investigative Radiology
https://www.readbyqxmd.com/read/29016370/heavily-calcified-coronary-arteries-advanced-calcium-subtraction-improves-luminal-visualization-and-diagnostic-confidence-in-dual-energy-coronary-computed-tomography-angiography
#2
Domenico De Santis, Kwang Nam Jin, U Joseph Schoepf, Katharine L Grant, Carlo N De Cecco, John W Nance, Thomas J Vogl, Andrea Laghi, Moritz H Albrecht
OBJECTIVES: The aim of this study was to evaluate a prototype dual-energy computed tomography calcium subtraction algorithm and its impact on luminal visualization in patients with heavily calcified coronary arteries. MATERIALS AND METHODS: Twenty-nine patients (62% male; mean age, 64 ± 7 years) who had undergone dual-energy coronary computed tomography angiography were retrospectively included in this institutional review board-approved, Health Insurance Portability and Accountability Act-compliant study...
October 9, 2017: Investigative Radiology
https://www.readbyqxmd.com/read/28990974/iodine-and-fat-quantification-for-differentiation-of-adrenal-gland-adenomas-from-metastases-using-third-generation-dual-source-dual-energy-computed-tomography
#3
Simon S Martin, Sebastian Weidinger, Rouben Czwikla, Benjamin Kaltenbach, Moritz H Albrecht, Lukas Lenga, Thomas J Vogl, Julian L Wichmann
OBJECTIVES: The aim of this study was to investigate the value of third-generation dual-source dual-energy computed tomography (DECT) iodine and fat quantification in differentiating adrenal gland adenomas from metastases. MATERIALS AND METHODS: Sixty-two patients (38 men and 24 women; mean age, 69.1 years) underwent clinically indicated DECT of the abdomen on a third-generation dual-source scanner. Examinations were retrospectively included due to detected adrenal masses...
October 3, 2017: Investigative Radiology
https://www.readbyqxmd.com/read/28990973/the-issue-of-gadolinium-retained-in-tissues-insights-on-the-role-of-metal-complex-stability-by-comparing-metal-uptake-in-murine-tissues-upon-the-concomitant-administration-of-lanthanum-and-gadolinium-diethylentriamminopentaacetate
#4
Enza Di Gregorio, Giuseppe Ferrauto, Chiara Furlan, Stefania Lanzardo, Raffaele Nuzzi, Eliana Gianolio, Silvio Aime
OBJECTIVES: The aim of the study was to explore the role of the stability of metal complexes in the processes that lead to the metal retention in the brain and other tissues of mice administered with lanthanides-based contrast agents. This issue was tackled by the simultaneous injection of gadolinium (Gd)-diethylentriamminopentaacetate (DTPA) and lanthanum-DTPA, which have the same charge and structure but differ in their thermodynamic stability by 3 orders of magnitude. MATERIALS AND METHODS: A total of 20 healthy BALB/c mice were administered by a single intravenous injection with a dose consisting of 0...
October 3, 2017: Investigative Radiology
https://www.readbyqxmd.com/read/28976477/diagnostic-value-of-magnetic-resonance-neurography-in-cervical-radiculopathy-plexus-patterns-and-peripheral-nerve-lesions
#5
Daniel Schwarz, Henrich Kele, Moritz Kronlage, Tim Godel, Tim Hilgenfeld, Martin Bendszus, Philipp Bäumer
OBJECTIVE: The aim of this study was to assess the imaging appearance and diagnostic value of plexus and peripheral nerve magnetic resonance neurography (MRN) in cervical radiculopathy. MATERIALS AND METHODS: This prospective study was approved by our institutional ethics committee and written informed consent was obtained from all participants. A total of 24 patients were included with a diagnosis of cervical radiculopathy based on clinical examination, supporting electrophysiological examinations and spinal imaging consistent with the clinical syndrome...
October 2, 2017: Investigative Radiology
https://www.readbyqxmd.com/read/28976476/comparison-of-unenhanced-t1-weighted-signal-intensities-within-the-dentate-nucleus-and-the-globus-pallidus-after-serial-applications-of-gadopentetate-dimeglumine-versus-gadobutrol-in-a-pediatric-population
#6
Diane M Renz, Stefanie Kümpel, Joachim Böttcher, Alexander Pfeil, Florian Streitparth, Matthias Waginger, Jürgen R Reichenbach, Ulf K Teichgräber, Hans-Joachim Mentzel
OBJECTIVE: The aim of this study was to evaluate and compare changes in T1-weighted signal intensity (SI) within the dentate nucleus (DN) and globus pallidus (GP) in a pediatric population after serial applications of the linear gadolinium-based magnetic resonance contrast medium gadopentetate dimeglumine and the more stable macrocyclic agent gadobutrol. MATERIALS AND METHODS: Institutional review board approval was obtained. Two similar pediatric patient cohorts who underwent at least 3 serial contrast-enhanced magnetic resonance imaging (MRI) examinations with sole application of gadopentetate dimeglumine or gadobutrol were analyzed...
October 2, 2017: Investigative Radiology
https://www.readbyqxmd.com/read/28976478/compressed-sensing-accelerated-3-dimensional-magnetic-resonance-cholangiopancreatography-application-in-suspected-pancreatic-diseases
#7
Liang Zhu, Xi Wu, Zhaoyong Sun, Zhengyu Jin, Elisabeth Weiland, Esther Raithel, Tianyi Qian, Huadan Xue
OBJECTIVES: The aims of this study were to prospectively evaluate image quality, duct visibility, and diagnostic performance in duct-related pathologies of compressed-sensing (CS) accelerated 3-dimensional (3D) magnetic resonance cholangiopancreatography (MRCP) prototype protocols and compare these with those of conventional 3D MRCP protocol in patients with suspected pancreatic diseases. MATERIAL AND METHODS: The institutional review board approved this prospective study and all patients provided written informed consent...
September 26, 2017: Investigative Radiology
https://www.readbyqxmd.com/read/28945655/photon-counting-ct-high-resolution-imaging-of-coronary-stents
#8
Manoj Mannil, Tilman Hickethier, Jochen von Spiczak, Matthias Baer, André Henning, Madeleine Hertel, Bernhard Schmidt, Thomas Flohr, David Maintz, Hatem Alkadhi
PURPOSE: The aim of this study was to investigate computed tomography (CT) imaging characteristics of coronary stents using a novel photon-counting detector (PCD) in comparison with a conventional energy-integrating detector (EID). MATERIALS AND METHODS: In this in vitro study, 18 different coronary stents were expanded in plastic tubes of 3 mm diameter, were filled with contrast agent (diluted to an attenuation of 250 Hounsfield units [HU] at 120 kVp), and were sealed...
September 23, 2017: Investigative Radiology
https://www.readbyqxmd.com/read/28937545/non-contrast-pseudo-continuous-arterial-spin-labeling-and-accelerated-3-dimensional-radial-acquisition-intracranial-3-dimensional-magnetic-resonance-angiography-for-the-detection-and-classification-of-intracranial-arteriovenous-shunts
#9
Tilman Schubert, Zachary Clark, Carolina Sandoval-Garcia, Ryan Zea, Oliver Wieben, Huimin Wu, Patrick A Turski, Kevin M Johnson
OBJECTIVES: The aim of this study was to assess the sensitivity and specificity of pseudo-continuous arterial spin labeling (PCASL) magnetic resonance angiography (MRA) with 3-dimensional (3D) radial acquisition for the detection of intracranial arteriovenous (AV) shunts. MATERIALS AND METHODS: A total of 32 patients who underwent PCASL-MRA, clinical magnetic resonance imaging (MRI)/MRA exam, and digital subtraction angiography (DSA) were included in this retrospective analysis...
September 20, 2017: Investigative Radiology
https://www.readbyqxmd.com/read/28926370/photon-counting-computed-tomography-for-vascular-imaging-of-the-head-and-neck-first-in-vivo-human-results
#10
Rolf Symons, Daniel S Reich, Mohammadhadi Bagheri, Tyler E Cork, Bernhard Krauss, Stefan Ulzheimer, Steffen Kappler, David A Bluemke, Amir Pourmorteza
PURPOSE: The purpose of this study was to evaluate image quality of a spectral photon-counting detector (PCD) computed tomography (CT) system for evaluation of major arteries of the head and neck compared with conventional single-energy CT scans using energy-integrating detectors (EIDs). METHODS: In this institutional review board-approved study, 16 asymptomatic subjects (7 men) provided informed consent and received both PCD and EID contrast-enhanced CT scans of the head and neck (mean age, 58 years; range, 46-75 years)...
September 18, 2017: Investigative Radiology
https://www.readbyqxmd.com/read/28915162/the-effect-of-perinatal-gadolinium-based-contrast-agents-on-adult-mice-behavior
#11
Miski Aghnia Khairinisa, Yusuke Takatsuru, Izuki Amano, Khongorzul Erdene, Takahito Nakajima, Satomi Kameo, Hiroshi Koyama, Yoshito Tsushima, Noriyuki Koibuchi
OBJECTIVES: The aim of this study was to examine the effects of perinatal exposure to gadolinium (Gd)-based contrast agents (GBCAs) on the behavior of adulthood offspring. MATERIALS AND METHODS: Pregnant Balb/C mice (n = 5 per group) were intravenously injected with gadoterate meglumine (Magnescope, macrocyclic GBCA), gadodiamide (Omniscan, linear GBCA), or vehicle from pregnancy day 15 to 19, corresponding to embryonic day 15 to 19 of the fetus, at 2 mmol/kg body weight per day...
September 14, 2017: Investigative Radiology
https://www.readbyqxmd.com/read/28915161/unenhanced-dual-energy-computed-tomography-visualization-of-brain-edema
#12
Mohammed F Mohammed, Olivia Marais, Adam Min, David Ferguson, Sabeena Jalakhan, Faisal Khosa, Michael OʼKeeffe, Tim OʼConnell, Heiko Schmiedeskamp, Bernhard Krauss, Axel Rohr, Savvas Nicolaou
PURPOSE: The aim of this study was to determine whether dual-energy computed tomography (DECT) imaging is superior to conventional noncontrast computed tomography (CT) imaging for the detection of acute ischemic stroke. MATERIALS AND METHODS: This was a retrospective, single-center study of 40 patients who presented to the emergency department (ED) of a major, acute care, teaching center with signs and symptoms of acute stroke. Only those patients who presented to the ED within 4 hours of symptom onset were included in this study...
September 14, 2017: Investigative Radiology
https://www.readbyqxmd.com/read/28906339/multiparametric-magnetic-resonance-imaging-of-prostate-cancer-bone-disease-correlation-with-bone-biopsy-histological-and-molecular-features
#13
Raquel Perez-Lopez, Daniel Nava Rodrigues, Ines Figueiredo, Joaquin Mateo, David J Collins, Dow-Mu Koh, Johann S de Bono, Nina Tunariu
OBJECTIVES: The aim of this study was to correlate magnetic resonance imaging (MRI) of castration-resistant prostate cancer (CRPC) bone metastases with histological and molecular features of bone metastases. MATERIALS AND METHODS: Forty-three bone marrow biopsies from 33 metastatic CRPC (mCRPC) patients with multiparametric MRI and documented bone metastases were evaluated. A second cohort included 10 CRPC patients with no bone metastases. Associations of apparent diffusion coefficient (ADC), normalized b900 diffusion-weighted imaging (nDWI) signal, and signal-weighted fat fraction (swFF) with bone marrow biopsy histological parameters were evaluated using Mann-Whitney U test and Spearman correlations...
September 12, 2017: Investigative Radiology
https://www.readbyqxmd.com/read/28906338/a-pharmacokinetics-efficacy-and-safety-study-of-gadoterate-meglumine-in-pediatric-subjects-aged-younger-than-2-years
#14
Mario Scala, Meriam Koob, Sophie de Buttet, Philippe Bourrinet, Mathieu Felices, Elzbieta Jurkiewicz
OBJECTIVES: The primary objective of this study was to investigate the pharmacokinetic profile of gadoterate meglumine in pediatric patients younger than 2 years; the secondary objectives were to document its efficacy and safety. MATERIAL AND METHODS: This was a Phase IV open-label, prospective study conducted in 9 centers (4 countries). Forty-five patients younger than 2 years with normal estimated glomerular filtration rate and scheduled to undergo routine gadolinium-enhanced magnetic resonance imaging (MRI) of any organ were included and received a single intravenous injection of gadoterate meglumine (0...
September 12, 2017: Investigative Radiology
https://www.readbyqxmd.com/read/28902723/evaluation-of-transient-motion-during-gadoxetic-acid-enhanced-multiphasic-liver-magnetic-resonance-imaging-using-free-breathing-golden-angle-radial-sparse-parallel-magnetic-resonance-imaging
#15
Jeong Hee Yoon, Jeong Min Lee, Mi Hye Yu, Bo Yun Hur, Robert Grimm, Kai Tobias Block, Hersh Chandarana, Berthold Kiefer, Yohan Son
OBJECTIVES: The aims of this study were to observe the pattern of transient motion after gadoxetic acid administration including incidence, onset, and duration, and to evaluate the clinical feasibility of free-breathing gadoxetic acid-enhanced liver magnetic resonance imaging using golden-angle radial sparse parallel (GRASP) imaging with respiratory gating. MATERIALS AND METHODS: In this institutional review board-approved prospective study, 59 patients who provided informed consents were analyzed...
September 11, 2017: Investigative Radiology
https://www.readbyqxmd.com/read/28877046/quantitative-proton-spectroscopy-of-the-testes-at-3-t-toward-a-noninvasive-biomarker-of-spermatogenesis
#16
Pippa Storey, Oded Gonen, Andrew B Rosenkrantz, Kiranpreet K Khurana, Tiejun Zhao, Rajesh Bhatta, Joseph P Alukal
OBJECTIVES: The aim of this study was to compare testicular metabolite concentrations between fertile control subjects and infertile men. MATERIALS AND METHODS: Single voxel proton magnetic resonance spectroscopy (¹H-MRS) was performed in the testes with and without water suppression at 3 T in 9 fertile control subjects and 9 infertile patients (8 with azoospermia and 1 with oligospermia). In controls only, the T1 and T2 values of water and metabolites were also measured...
September 5, 2017: Investigative Radiology
https://www.readbyqxmd.com/read/28858894/multiple-sclerosis-improved-detection-of-active-cerebral-lesions-with-3-dimensional-t1-black-blood-magnetic-resonance-imaging-compared-with-conventional-3-dimensional-t1-gre-imaging
#17
Nora N Sommer, Tobias Saam, Eva Coppenrath, Hendrik Kooijman, Tania Kümpfel, Maximilian Patzig, Sebastian E Beyer, Wieland H Sommer, Maximilian F Reiser, Birgit Ertl-Wagner, Karla M Treitl
OBJECTIVES: The aim of this study was to assess the diagnostic accuracy of a modified high-resolution whole-brain three-dimensional T1-weighted black-blood sequence (T1-weighted modified volumetric isotropic turbo spin echo acquisition [T1-mVISTA]) in comparison to a standard three-dimensional T1-weighted magnetization-prepared rapid gradient echo (MP-RAGE) sequence for detection of contrast-enhancing cerebral lesions in patients with relapsing-remitting multiple sclerosis (MS). MATERIALS AND METHODS: After institutional review board approval and informed consent, 22 patients (8 men; aged 31...
August 30, 2017: Investigative Radiology
https://www.readbyqxmd.com/read/28857861/motion-corrected-real-time-cine-magnetic-resonance-imaging-of-the-heart-initial-clinical-experience
#18
Amir Ali Rahsepar, Haris Saybasili, Ahmadreza Ghasemiesfe, Ryan S Dolan, Monda L Shehata, Marcos P Botelho, Michael Markl, Bruce Spottiswoode, Jeremy D Collins, James C Carr
OBJECTIVES: Free-breathing real-time (RT) imaging can be used in patients with difficulty in breath-holding; however, RT cine imaging typically experiences poor image quality compared with segmented cine imaging because of low resolution. Here, we validate a novel unsupervised motion-corrected (MOCO) reconstruction technique for free-breathing RT cardiac images, called MOCO-RT. Motion-corrected RT uses elastic image registration to generate a single heartbeat of high-quality data from a free-breathing RT acquisition...
August 29, 2017: Investigative Radiology
https://www.readbyqxmd.com/read/28846552/qualitative-and-quantitative-evaluation-of-structural-myocardial-alterations-by-grating-based-phase-contrast-computed-tomography
#19
Susan Notohamiprodjo, Nicole Webber, Lorenz Birnbacher, Marian Willner, Manuel Viermetz, Julia Herzen, Mathias Marschner, Doris Mayr, Harald Bartsch, Tobias Saam, Sigrid Auweter, Franz Pfeiffer, Maximilian F Reiser, Holger Hetterich
OBJECTIVES: Grating-based phase-contrast computed tomography (gb-PCCT) relies on x-ray refraction instead of absorption to generate high-contrast images in biological soft tissue. The aim of this study was to evaluate the potential of gb-PCCT for the depiction of structural changes in heart disease. MATERIALS AND METHODS: Four human heart specimens from patients with hypertensive disease, ischemic disease, dilated heart disease, and cardiac lipomatosis were examined...
August 25, 2017: Investigative Radiology
https://www.readbyqxmd.com/read/28817393/increased-expiratory-computed-tomography-density-reveals-possible-abnormalities-in-radiologically-preserved-lung-parenchyma-in-idiopathic-pulmonary-fibrosis
#20
Valentina Petroulia, Manuela Funke, Pascal Zumstein, Sabina Berezowska, Lukas Ebner, Thomas Geiser, Nenad Torbica, Johannes Heverhagen, Alexander Poellinger
OBJECTIVES: Idiopathic pulmonary fibrosis (IPF) is a progressive lethal chronic lung disease with unclear pathogenesis. Radiological hallmark is the pattern of usual interstitial pneumonia accentuated in peripheral and basal areas with otherwise preserved lung structure. One hypothesis is that alveolar collapse and consequent induration lead to fibrotic transformation of lung tissue. The aim of the study was to investigate normal-appearing tissue during expiration for signs of collapsibility and differences from other diseases or controls...
August 16, 2017: Investigative Radiology
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