ARTIFACTS
A common artifact that occurs when the FOV is smaller than the body part being imaged.
Aliasing, or wrap around artifact
This Medtronic implant must be located in the right ventricle for an MR conditional scan
Micra pacemaker
The abundant element in the human body that is imaged in MRI
Hydrogen
Type of material that our Safescan wands are designed to detect
Ferromagnetic objects
The red lines on the floors of the scan room indicate this important threshold.
5 Gauss line
Results from field inhomogeneities caused by RF interferences; occurs along the frequency encoding direction
Zipper artifact
A Medtronic bladder stimulator requires how many minutes of rest time between studies
5 minutes
1 Tesla equals how many Gauss
10,000 Gauss
This disease, associated with gadolinium retention, is the reason why we ask about diabetes, HTN, and any kidney issues.
NSF: Nephrogenic Systemic Fibrosis
What is the SAR limit for a scan in first level operating mode?
4W/kg
Also known as truncation artifact, this shows as a series of fine parallel lines adjacent to sharp tissue interfaces; occurs often in spinal cord imaging
Gibbs artifact
An implant labeled as what requires strict manufacturer guidelines be followed for safe scanning
MR conditional
B-zero refers to this
The static magnetic field
This area is for screened and changed individuals under direct supervision of trained MRI personnel only
Zone 4
RF shielding in the exam room walls is normally composed of this
Copper
A type of noise where a portion of the main imaged object is replicated or smeared into other areas
Ghosting
These types of implants do not contain mechanical components and do not require power to operate
Passive implants
Increasing the bandwidth results in what happening to the SNR
In addition to patients, these people should be screened prior to entering Zone 3
Everyone
Heart stents must be scanned at what number W/kg
2 W/kg
Using this type of coil is sometimes a condition for safe scanning of an implant because it focuses RF to just the anatomy within that coil
Transmit receive coil
In MR imaging, matrix size (phase and frequency) determines what?
Resolution
Gradient echo sequences are high in SAR, true or false
False