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MRI Resources 
General - Nerve Stimulator - MR Myelography - Breast MRI - Raman Spectroscopy - Guidance
 
Artifact by Patient MovementInfoSheet: - Artifacts -
Case Studies, 
Reduction Index, 
etc.MRI Resource Directory:
 - Artifacts -
 
Quick Overview
Please note that there are different common names for this artifact.
Artifact Information
NAME
Motion, movement
DESCRIPTION
Blurring, ghosting
REASON
Patient movement
HELP
Fast scan techniques
Patient movement during the scans are often an imaging problem. Artifacts from patient movement are widely varied due to a dependence when during k-space filling the motion occurs. When the patient moving causes only in the last few seconds of the scan at that time the outside edges of K-space were being filled, and as a result the artifact does not overly affect the image (there are only fine lines).
image guidance
Image Guidance
A good cooperation between the patient and the operator is the best way to avoid these artifacts, in difficult cases a sedative may help. If a compliance of the patient is not possible (e.g. pain, stroke, or consciousness), choose fast scan methods like gradient echo or single shot technique.

See also Motion Artifact and Phase Encoded Motion Artifact.
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Further Reading:
  News & More:
Patient movement during MRI: Additional points to ponder
Tuesday, 5 January 2016   by www.healthimaging.com    
MRI results affected by movement? MIT researchers have an AI-powered solution
Friday, 25 August 2023   by healthimaging.com    
Artirem®InfoSheet: - Contrast Agents - 
Intro, Overview, 
Characteristics, 
Types of, 
etc.MRI Resource Directory:
 - Contrast Agents -
 
Artirem®, the arthrography-specific contrast agent for MRI is a dilute form of Dotarem® with a less concentration of Gd (1:200). Artirem® has to be injected directly into the joints for better visualization and delimitation, of the ligament and tendon structures in particular.
Drug Information and Specification
NAME OF COMPOUND
DEVELOPER
CENTRAL MOIETY
Gd2+
CONTRAST EFFECT
T1, Predominantly positive enhancement
r1=3.4, r2=4.8, B0=1.0T
PHARMACOKINETIC
Intravascular, extracellular, renal excretion
CONCENTRATION
0,0025 mmol/ml
PREPARATION
Finished product
INDICATION
Arthrography
DEVELOPMENT STAGE
For sale
DISTRIBUTOR
See below
PRESENTATION
Pre-filled syringes of 20 mL
DO NOT RELY ON THE INFORMATION PROVIDED HERE, THEY ARE
NOT A SUBSTITUTE FOR THE ACCOMPANYING PACKAGE INSERT!
Distribution Information
TERRITORY
TRADE NAME
DEVELOPMENT
STAGE
DISTRIBUTOR
EU
for sale
France, Switzerland
Artirem®
for sale
Australia
for sale
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• View the DATABASE results for 'Artirem®' (4).Open this link in a new window

 
Further Reading:
  News & More:
EMA's final opinion confirms restrictions on use of linear gadolinium agents in body scans
Friday, 21 July 2017   by www.ema.europa.eu    
MRI Resources 
Calculation - Contrast Agents - Pregnancy - Open Directory Project - Chemistry - Mobile MRI Rental
 
ARTOSCAN™ - MInfoSheet: - Devices -
Intro, 
Types of Magnets, 
Overview, etc.MRI Resource Directory:
 - Devices -
 
www.gemedicalsystems.com/rad/mri/products/artoscan/specs.html Developed by GE Lunar; the ARTOSCAN™-M is designed specifically for in-office musculoskeletal imaging. ARTOSCAN-M's compact, modular design allows placing within a clinical environment, bringing MRI to the patient. Patients remain outside the magnet at all times during the examinations, enabling constant patient-technologist contact. ARTOSCAN-M requires no special RF room, magnetic shielding, special power supply or air conditioning.
The C-SCAN™ (also known as Artoscan C) is developed from the ARTOSCAN™ - M, with a new computer platform.
Device Information and Specification
CLINICAL APPLICATION
Dedicated extremity
CONFIGURATION
Closed
Linear and dual phased array coil, knee, ankle, wrist coils
PULSE SEQUENCES
SE, GE, IR, STIR, FSE, 3D CE, GE-STIR, 3D GE, ME, TME, HSE
IMAGING MODES
Single, multislice, volume study, fast scan, multi slab, cine
TR
12 - 5,000 msec
TE
5 - 220 msec
SINGLE SLICE
0.8 sec/image
MULTISLICE
0.8 sec/image
FOV
10 - 20 cm
SLICE THICKNESS
2D: 2 mm - 10 mm;
3D: 0.6 mm - 10 mm
512 x 512
MEASURING MATRIX
256 x 256 maximum
PIXEL INTENSITY
4,096 gray lvls, 256 lvls in 3D
MAGNET TYPE
Ferrite Permanent
MAGNET WEIGHT
965 kg
POWER REQUIREMENTS
100/110/200/220/230/240V
STRENGTH
10 mT/m
5 GAUSS FRINGE FIELD, radial/axial
28 cm/60 cm
Passive
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• View the DATABASE results for 'ARTOSCAN™ - M' (3).Open this link in a new window

Asymmetric Sampling
 
The collection of more data points on one side of the k-space origin than on the other. With fewer k-space data points prior to the center (echo) a shorter echo time can be attained. Asymmetric acquisition in any phase encoding direction followed by partial-Fourier reconstruction leads to a reduction in imaging time.
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• View the DATABASE results for 'Asymmetric Sampling' (2).Open this link in a new window

Asymmetrical Echoes
 
The echo time TE vary from echo to echo in the echo train.
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• View the DATABASE results for 'Asymmetrical Echoes' (2).Open this link in a new window

MRI Resources 
Absorption and Emission - General - Contrast Agents - Mass Spectrometry - Intraoperative MRI - Pregnancy
 
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