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MRSO - Implants and Devices - Module 5 Questions & Correct Revised Verified Answers
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MRSO - Implants and Devices - Module 5 Questions & Correct Revised Verified Answers
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MRSO - Implants and Devices - Module5 Questions & Correct Revised Verified
Answers
When evaluating conditions of an implant regarding spatial gradient, the SYSTEM'S
maximum spatial field gradient is irrelevant. The spatial field gradient amount that
should be considered is - Answer The maximum at which the object will be EXPOSED
Extrapolated Spatial Gradient - Answer deflection angle is determined then
extrapolated to a theoretical "fail point"
-measured angle was likely very small, meaning there should be no concerns
regarding spatial gradients
39:27 heart valves / annuloplasty rings
clips
iud - Answer
As determined by the ACR, documentation of implants must be: - Answer in writing
(faxed reports are acceptable)
, Are all stents safe? - Answer No
RF Frequency is determined by - Answer Larmor equation
Resonant frequency = static field x gyromagnetic ratio
Resonant frequency of hydrogen - Answer 1.5T = 63.87 MHz
3T= 127.74 MHz
7T= 298.06 MHz
In relation to the RF, increasing B0, results in - Answer increasing frequency of RF
For elongated or closed loop conductor, optimal current induction occurs when -
Answer length of conductor or size of closed loop matches a major harmonic of the
RF wavelength
AKA: it becomes an efficient antennae regarding RF induction
External fixation systems consist of - Answer elongated AND closed loop conductors
Conditions of conditional pacemakers - Answer are NOT all the same
Non-labeled cardiac device risks - Answer -movement/vibration
-device damage
-excessive battery drain
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