 | Info Sheets |
| | | | | | | | | | | | | | | | | | | | | | | | |
 | Out- side |
| | | | |
|
| | | | |
Result : Searchterm 'SAR' found in 3 terms [ ] and 60 definitions [ ]
| previous 41 - 45 (of 63) nextResult Pages : [1] [2 3 4 5 6 7 8 9 10 11 12 13] |  | |  | Searchterm 'SAR' was also found in the following services: | | | | |
|  |  |
| |
|
Liver imaging can be performed with sonography, computed tomography (CT) and magnetic resonance imaging ( MRI). Ultrasound is, caused by the easy access, still the first-line imaging method of choice; CT and MRI are applied whenever ultrasound imaging yields vague results. Indications are the characterization of metastases and primary liver tumors e.g., benign lesions such as focal nodular hyperplasia (FNH), adenoma, hemangioma and malignant lesions (cancer) such as hepatocellular carcinomas (HCC).
The decision, which medical imaging modality is more suitable, MRI or CT, is dependent on the different factors. CT is less costly and more widely available; modern multislice scanners provide high spatial resolution and short scan times but has the disadvantage of radiation exposure.
With the introduction of high performance MR systems and advanced sequences the image quality of MRI for the liver has gained substantially. Fast spin echo or single shot techniques, often combined with fat suppression, are the most common T2 weighted sequences used in liver MRI procedures.
Spoiled gradient echo sequences are used as ideal T1 weighted sequences for evaluating of the liver. The repetition time (TR) can be sufficiently long to acquire enough sections covering the entire liver in one pass, and to provide good signal to noise. The TE should be the shortest in phase echo time (TE), which provides strong T1 weighting, minimizes magnetic susceptibility effects, and permits acquisition within one breath hold to cover the whole liver. A flip angle of 80° provides good T1 weighting and less of power deposition and tissue saturation than a larger flip angle that would provide comparable T1 weighting.
Liver MRI is very dependent on the administration of contrast agents, especially when detection and characterization of focal lesions are the issues. Liver MRI combined with MRCP is useful to evaluate patients with hepatic and biliary disease.
Gadolinium chelates are typical non-specific extracellular agents diffusing rapidly to the extravascular space of tissues being cleared by glomerular filtration at the kidney. These characteristics are somewhat problematic when a large organ with a huge interstitial space like the liver is imaged. These agents provide a small temporal imaging window (seconds), after which they begin to diffuse to the interstitial space not only of healthy liver cells but also of lesions, reducing the contrast gradient neces sary for easy lesion detection. Dynamic MRI with multiple phases after i.v. contrast media (Gd chelates), with arterial, portal and late phase images (similar to CT) provides additional information.
An additional advantage of MRI is the availability of liver-specific contrast agents (see also Hepatobiliary Contrast Agents). Gd-EOB-DTPA (gadoxetate disodium, Gadolinium ethoxybenzyl dimeglumine, EOVIST Injection, brand name in other countries is Primovist) is a gadolinium-based MRI contrast agent approved by the FDA for the detection and characterization of known or suspected focal liver lesions.
Gd-EOB-DTPA provides dynamic phases after intravenous injection, similarly to non-specific gadolinium chelates, and distributes into the hepatocytes and bile ducts during the hepatobiliary phase. It has up to 50% hepatobiliary excretion in the normal liver.
Since ferumoxides are not eliminated by the kidney, they possess long plasmatic half-lives, allowing circulation for several minutes in the vascular space. The uptake process is dependent on the total size of the particle being quicker for larger particles with a size of the range of 150 nm (called superparamagnetic iron oxide). The smaller ones, possessing a total particle size in the order of 30 nm, are called ultrasmall superparamagnetic iron oxide particles and they suffer a slower uptake by RES cells. Intracellular contrast agents used in liver MRI are primarily targeted to the normal liver parenchyma and not to pathological cells. Currently, iron oxide based MRI contrast agents are not marketed.
Beyond contrast enhanced MRI, the detection of fatty liver disease and iron overload has clinical significance due to the potential for evolution into cirrhosis and hepatocellular carcinoma. Imaging-based liver fat quantification (see also Dixon) provides noninvasively information about fat metabolism; chemical shift imaging or T2*-weighted imaging allow the quantification of hepatic iron concentration.
See also Abdominal Imaging, Primovistâ„¢, Liver Acquisition with Volume Acquisition (LAVA), T1W High Resolution Isotropic Volume Examination (THRIVE) and Bolus Injection.
For Ultrasound Imaging (USI) see Liver Sonography at Medical-Ultrasound-Imaging.com. | | | | | | | | | | | | | | | | Further Reading: | | Basics:
|
|
News & More:
|  |
Utility and impact of magnetic resonance elastography in the clinical course and management of chronic liver disease Saturday, 20 January 2024 by www.nature.com |  |  |
Even early forms of liver disease affect heart health, Cedars-Sinai study finds Thursday, 8 December 2022 by www.eurekalert.org |  |  |
For monitoring purposes, AI-aided MRI does what liver biopsy does with less risk, lower cost Wednesday, 28 September 2022 by radiologybusiness.com |  |  |
Perspectum: High Liver Fat (Hepatic Steatosis) Linked to Increased Risk of Hospitalization in COVID-19 Patients With Obesity Monday, 29 March 2021 by www.businesswire.com |  |  |
EMA's final opinion confirms restrictions on use of linear gadolinium agents in body scans Friday, 21 July 2017 by www.ema.europa.eu |  |  |
T2-Weighted Liver MRI Using the MultiVane Technique at 3T: Comparison with Conventional T2-Weighted MRI Friday, 16 October 2015 by www.ncbi.nlm.nih.gov |  |  |
EORTC study aims to qualify ADC as predictive imaging biomarker in preoperative regimens Monday, 4 January 2016 by www.eurekalert.org |  |  |
MRI effectively measures hemochromatosis iron burden Saturday, 3 October 2015 by medicalxpress.com |  |  |
Total body iron balance: Liver MRI better than biopsy Sunday, 15 March 2015 by www.eurekalert.org |
|
| |
|  | |  |  |  |
| |
|

From Siemens Medical Systems;
Received FDA clearance in 2007.
The MAGNETOM Verio provides up to 102 integrated matrix coil elements and up to 32 independent radiofrequency channels that allow flexible coil combinations to make patient and coil repositioning virtually unneces sary. The Tim (total imaging matrix) technology also increases patient throughput due to a shorter scan time.
The open bore design offers great comfort for patients of all shapes and sizes.
Device Information and Specification
CLINICAL APPLICATION
Whole Body
CONFIGURATION
Ultra-short open bore
Head, spine, torso/ body coil, neurovascular, cardiac, neck and multi-purpose flex coils. Peripheral vascular, breast, shoulder, knee, wrist, foot//ankle, TMJ optional.
CHANNELS (min. / max. configuration)
8, 18, 32
Chemical shift imaging, single voxel spectroscopy
MAGNET WEIGHT (gantry included)
8200 kg
DIMENSION H*W*D (gantry included)
173 x 230 x 222 cm
Passive, active; first order,
second order standard
POWER REQUIREMENTS
380 / 400 / 420 / 440 / 460 / 480 V, 3-phase + ground; 110 kVA
| |  | | | |
|  | |  |  |  |
| |
|

From Siemens Medical Systems;
70 cm + 125 cm + 1.5T and Tim - a combination never seen before in MRI ...
MAGNETOM Espree™s unique open bore design can accommodate more types of patients than other 1.5T systems on the market today, in particular the growing population of obese patients. The power of 1.5T combined with Tim technology boosts signal to noise, which is neces sary to adequately image obese patients.
Device Information and Specification
CLINICAL APPLICATION
Whole body
Body, Tim [32 x 8], Tim [76 coil elements with up to 18 RF channels])
GRE, IR, FIR, STIR, TrueIR/FISP, FSE, FLAIR, MT, SS-FSE, MT-SE, MTC, MSE, EPI, 3D DESS//CISS/PSIF, GMR
IMAGING MODES
Single, multislice, volume study, multi angle, multi oblique
Image Processor reconstructing up to 3226 images per second (256 x 256, 25% recFoV)
1024 x 1024 full screen display
| |  | | • View the DATABASE results for 'MAGNETOM Espree™' (2).
| | | | Further Reading: | News & More:
|
|
| |
|  |  | Searchterm 'SAR' was also found in the following services: | | | | |
|  |  |
| |
|
| |  | | • View the DATABASE results for 'MR Guided Interventions' (8).
| | | | Further Reading: | Basics:
|
|
News & More:
|  |
AI analysis finds younger AFib patients benefit from MRI-guided ablation treatments Friday, 25 August 2023 by www.eurekalert.org |  |  |
Theranostic nano-platform for MRI-guided synergistic therapy against breast cancer Monday, 26 September 2022 by phys.org |  |  |
Magnetic seeds used to heat and kill cancer Tuesday, 1 February 2022 by www.sciencedaily.com |  |  |
What is the effect of MRI with targeted biopsies on the rate of patients discontinuing active surveillance? A reflection of the use of MRI in the PRIAS study Thursday, 8 April 2021 by www.docwirenews.com |  |  |
Modeling of Active Shimming of Metallic Needles for Interventional MRI Monday, 29 June 2020 by pubmed.ncbi.nlm.nih.gov |  |  |
Magnetic Resonance Imaging Guided Confirmatory Biopsy for Initiating Active Surveillance of Prostate Cancer Wednesday, 11 September 2019 by jamanetwork.com |  |  |
FDA clears ViewRay's next-gen, MRI-guided radiation therapy device Tuesday, 28 February 2017 by www.fiercebiotech.com |  |  |
Siemens, U. of Twente Biopsy Robot Promises Greater Precision, Less Cost Friday, 22 January 2016 by www.meddeviceonline.com |  |  |
Magnetic resonance-guided motorized transcranial ultrasound system for blood-brain barrier permeabilization along arbitrary trajectories in rodents Thursday, 24 December 2015 by www.ncbi.nlm.nih.gov |  |  |
New MRI-Guided Catheter Shows Major Potential for Stroke Treatment Tuesday, 29 December 2015 by www.radiology.ucsf.edu |  |  |
Polish study on MRI-ultrasound for targeted prostate biopsy wins CEM award Tuesday, 12 November 2013 by medicalxpress.com |  |  |
C4 Imaging Announces FDA 510(k) Clearance of its Positive-Signal MRI Marker - Sirius™ Friday, 6 December 2013 by www.digitaljournal.com |
|
| |
|  | |  |  |  |
| |
|

From Hitachi Medical Systems America, Inc.; because of its dependability, the MRP-7000™ remains popular more than a decade after the first U.S. system was shipped. This system maintains a high resale value, what has made it one of the most sought-after scanners on the used MRI equipment market.
Device Information and Specification CLINICAL APPLICATION Whole body DualQuad T/R Body Coil, MA Head, MA C-Spine, MA Shoulder, MA Wrist, MA CTL Spine, MA Knee, MA TMJ, MA Flex Body (3 sizes), Neck, small and large Extremity, PVA (WIP), Breast (WIP), Neurovascular (WIP), Cardiac (WIP) and MA Foot//Ankle (WIP) SE, GE, GR, IR, FIR, STIR, ss-FSE, FSE, DE-FSE/FIR, FLAIR, ss/ms-EPI, ss/ms EPI- DWI, SSP, MTC, SE/GE-EPI, MRCP, SARGE, RSSG, TRSG, BASG, Angiography: CE, PC, 2D/3D TOFIMAGING MODES Single, multislice, volume study horizontal 2.5 m x 2.1 m vertical | |  | | • View the DATABASE results for 'MRP-7000™' (2).
| | | | |
|  | |  |  |
|  | | |
|
| |
 | Look Ups |
| |