scholarly journals Contraindications and adverse effects in abdominal imaging

2019 ◽  
Vol 21 (4) ◽  
pp. 456 ◽  
Author(s):  
Cosmin Caraiani ◽  
Bianca Petresc ◽  
Yi Dong ◽  
Christoph F. Dietrich
Keyword(s):  
Contrast Media ◽  
Foreign Bodies ◽  
Imaging Techniques ◽  
Resonance Imaging ◽  
Contrast Administration ◽  
Contrast Induced Nephropathy ◽  
Mri Contrast ◽  
Abdominal Disease ◽  
Magnetic Resonance Imaging Mri ◽  
Contrast Media Administration

Ultrasound (US), computed-tomography (CT) and magnetic resonance imaging (MRI) are the most frequently used imaging techniques in abdominal pathology. US plays a pivotal role in evaluating abdominal disease, sometimes being sufficient for a complete diagnosis and has virtually no contraindications. The usage of US contrast agents will add useful diagnostic information in both hepatic and non-hepatic pathology. CT has, over MRI, the advantage of being readily available. The usage of ionizing radiation is the main pitfall of CT. Allergies and contrast induced nephropathy in patients with an impaired renal function are the major risks of contrast media administration in CT. Its excellent tissue resolution makes MRI a very useful technique in abdominal pathology, the major contraindications being the presence of MRI “unsafe” implants and devices and the presence of metallic foreign bodies, particularly close to vital structures like the eyes or major vessels. Contrast administration in MRI is restricted in patients with renal insufficiency due to the risk of nephrogenic systemic fibrosis. Allergies to MRI contrast media are rare and less important compared to allergies due to CT contrast media

scholarly journals Reasons for inadequate or incomplete imaging techniques

2018 ◽  
Vol 20 (4) ◽  
pp. 498 ◽  
Author(s):  
Cosmin Caraiani ◽  
Yi Dong ◽  
Anthony G. Rudd ◽  
Christoph F. Dietrich
Keyword(s):  
Foreign Bodies ◽  
Pediatric Patients ◽  
Imaging Technique ◽  
Imaging Techniques ◽  
Low Cost ◽  
Significant Proportion ◽  
Absolute Contraindication ◽  
Resonance Imaging ◽  
Magnetic Resonance Imaging Mri ◽  
And Performance

Even if imaging has developed considerably during the last decades there still exist several factors which limit its capacities. These factors can either limit the usage of a technique or degrade images making them difficult to interpret. Magnetic resonance imaging (MRI) has, as an absolute contraindication, the presence of metallic devices marked as “MRI unsafe” and metallic foreign bodies close to the eye or vital structures. Claustrophobia and artefacts reduce the application and performance of MRI in a significant proportion of patients. The major disadvantages of computed tomography(CT) are the exposure to ionizing radiation inducing malignancies especially in pediatric patients and the risk of contrast induced allergies and nephropathy. Ultrasound is a safe, easily available and low-cost imaging technique without significant side effects for the patient. Obesity or bloating can severely limit ultrasound capacities.This paper written by radiologists and clinicians, highlights the main reasons leading to inadequate imaging and points out solutions to avoid inaccurate diagnosis due to incomplete imaging or presence of artifacts.

Anaphylaxis Induced by Magnetic Resonance Imaging (MRI) Contrast Media

2020 ◽  
Vol 7 (1) ◽  
pp. 32-42 ◽  
Author(s):  
Ana Rosado ◽  
Ana Gonzalez-Moreno ◽  
Martina Privitera-Torres ◽  
Miguel A Tejedor-Alonso
Keyword(s):  
Magnetic Resonance Imaging ◽  
Magnetic Resonance ◽  
Contrast Media ◽  
Resonance Imaging ◽  
Mri Contrast ◽  
Magnetic Resonance Imaging Mri

Biocompatible dextran-coated gadolinium-doped cerium oxide nanoparticles as MRI contrast agents with high T1 relaxivity and selective cytotoxicity to cancer cells

2021 ◽  
Author(s):  
Anton Popov ◽  
Maxim Artemovich Abakumov ◽  
Irina Savintseva ◽  
Artem Ermakov ◽  
Nelly Popova ◽  
...  
Keyword(s):  
Magnetic Resonance Imaging ◽  
Magnetic Resonance ◽  
Contrast Agents ◽  
Mri Contrast Agents ◽  
Cerium Oxide Nanoparticles ◽  
Oxide Nanoparticles ◽  
Resonance Imaging ◽  
Mri Contrast ◽  
Selective Cytotoxicity ◽  
Magnetic Resonance Imaging Mri

Gd-based complexes are widely used as magnetic resonance imaging (MRI) contrast agents. The safety of previously approved contrast agents is questionable and is being re-assessed. The main causes of concern...

Switchable 19F MRI polymer theranostics: towards in situ quantifiable drug release

2017 ◽  
Vol 8 (34) ◽  
pp. 5157-5166 ◽  
Author(s):  
A. V. Fuchs ◽  
A. P. Bapat ◽  
G. J. Cowin ◽  
K. J. Thurecht
Keyword(s):  
Magnetic Resonance Imaging ◽  
Magnetic Resonance ◽  
Hyperbranched Polymer ◽  
Relaxation Times ◽  
Mri Contrast Agent ◽  
Resonance Imaging ◽  
Mri Contrast ◽  
19F Mri ◽  
Magnetic Resonance Imaging Mri

A switchable polymeric 19F magnetic resonance imaging (MRI) contrast agent was synthesised whereby the transverse (T2) relaxation times increased as a therapeutic was released from a hyperbranched polymer (HBP) scaffold.

scholarly journals Preparation and application of various nanoparticles in biology and medicine

2013 ◽  
Vol 3 (1) ◽  
pp. 2 ◽  
Author(s):  
Vardan Gasparyan
Keyword(s):  
Magnetic Resonance Imaging ◽  
Drug Delivery ◽  
Silver Nanoparticles ◽  
Optical Properties ◽  
Mri Contrast Agents ◽  
Resonance Imaging ◽  
Gold And Silver Nanoparticles ◽  
Mri Contrast ◽  
Cellular Processes ◽  
Magnetic Resonance Imaging Mri

The present paper considers prospects for application of various nanoparticles in biology and medicine. Here are presented data on preparation of gold and silver nanoparticles, and effects of shape of these nanoparticles on their optical properties. Application of these nanoparticles in diagnostics, for drug delivery and therapy, and preparation of magnetic nanoparticles from iron and cobalt salts are also discussed. Application of these nanoparticles as magnetic resonance imaging (MRI) contrast agents and as vehicles for drug delivery, and preparation of quantum dots and their application as prospective nanoparticles for multiplex analysis and for visualization of cellular processes will be tackled. Finally, prospects for new types of nanocomposites (metallic nano-shells) will be not overlooked.

scholarly journals Perfusion Magnetic Resonance Imaging to Assess Brain Tumor Responses to New Therapies

1998 ◽  
Vol 5 (2) ◽  
pp. 115-123 ◽  
Author(s):  
Michael H. Lev ◽  
Fred Hochberg
Keyword(s):  
Magnetic Resonance Imaging ◽  
Brain Tumor ◽  
Magnetic Resonance ◽  
Imaging Techniques ◽  
Perfusion Mri ◽  
Perfusion Magnetic Resonance Imaging ◽  
Normal Brain ◽  
Resonance Imaging ◽  
New Therapies ◽  
Magnetic Resonance Imaging Mri

Background: Although magnetic resonance imaging (MRI) is effective in detecting the location of intracranial tumors, new imaging techniques have been studied that may enhance the specificity for the prediction of histologic grade of tumor and for the distinction between recurrence and tumor necrosis associated with cancer therapy. Methods: The authors review their experience and that of others on the use of perfusion magnetic resonance imaging to evaluate responses of brain tumors to new therapies. Results: Functional imaging techniques that can distinguish tumor from normal brain tissue using physiological parameters. These new approaches provide maps of tumor perfusion to monitor the effects of novel compounds that restrict tumor angiogenesis. Conclusions: Perfusion MRI not only may be as effective as radionuclide-based techniques in sensitivity and specificity in assessing brain tumor responses to new therapies, but also may offer higher resolution and convenient co-registration with conventional MRI, as well as time- and cost-effectiveness. Further study is needed to determine the role of perfusion MRI in assessing brain tumor responses to new therapies.

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