Magnetic Resonance Imaging (Mri) Information; Mri Related Testing; Image Distortion - Smiths Medical Medfusion 3500 Operator's Manual

Medfusion® Model 3500 pump V6 Operator's Manual
Magnetic Resonance Imaging
(MRI) Information
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The Medfusion Model 3500 pump V6 is MR
Conditional according to the terminology specified in
ASTM F2503, Standard Practice for Marking Medical
Devices and Other Items for Safety in the Magnetic
Resonance Environment.
Non-clinical testing demonstrated that the
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Medfusion Model 3500 pump V6 is MR Conditional.
The pump will not present a hazard or risk to the
patient or MR user, or significantly affect the MR
image quality if the pump is operated according to the
specific guidelines as follows:
WARNING: The pump must be positioned in an
MR environment such that it is secured to a non-
moveable object and the magnetic fringe field does
not exceed 150 gauss. Exposing the Medfusion
Model 3500 pump V6 to magnetic fields that exceed
150 gauss presents a risk of becoming a projectile
hazard and can lead to possible patient injury or
death. Irreversible damage to the pump can also
occur, rendering it inoperable.

MRI Related Testing

In non-clinical testing, the Medfusion
3500 pump V6 evaluations have included Magnetic
Attraction (projectile hazard), MR interference with
the pump, and MR Image Distortion.
• Magnetic Attraction (projectile hazard): The
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Medfusion Model 3500 pump V6 is not a
projectile hazard at 150 gauss static magnetic field
strength.
• MR Interference with the Pump: The Medfusion
Model 3500 pump V6 operated normally while in
the 150 gauss static magnetic field.
• MR Image Distortion: No MR imaging
interference was observed when tested with
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the Medfusion Model 3500 pump V6 at 8 feet
from the isocenter of a 1.5T (64 MHz) Siemens
Magnetom Symphony MR system, Siemens
Software VA35A-SP2, under the following
conditions: battery only (no AC cord), back of the
pump facing the MRI isocenter, full body receiver
coil (most sensitive), using standard spin echo and
gradient spin echo pulse sequences.
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Image Distortion

Certain MRI receiver coils are sensitive to electronic
emissions. Therefore, prior to patient examinations,
MR image scans should be completed while operating
the Medfusion
environment that is to be used for the examination to
verify acceptable MR image quality. Note that results
vary between MRI systems due to differences in
scanning systems and receivers used.
The following are tips to minimize the possibility of
image artifacts appearing:
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Furthermore, the MRI technologist can improve the
Signal to Noise Ratio (SNR) of the image, typically
reducing or eliminating image artifacts, by adjusting
any of the following variables:
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Model
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Model 3500 pump V6 in the MR
Ensure that the back of the pump faces the MRI
isocenter during operation (pump screen facing
away from the MRI.
Move the pump further from the isocenter of the
MRI system if image artifacts appear.
Operate the Medfusion
on battery power in an MR environment. The
presence of a powered AC cord typically induces
image artifacts.
Use signal rich pulse sequences like Spin Echo
where applicable
Decrease the Phase Encoding matrix
Increase the acquisition Field of View
Increase the slice thickness
Increase the number of averages
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Model 3500 pump V6