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MRSO - Implants and Devices - Module 5 Questions & Correct Revised Verified Answers $13.24   Add to cart

Exam (elaborations)

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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  • September 13, 2024
  • 14
  • 2024/2025
  • Exam (elaborations)
  • Questions & answers
  • MRSO
  • MRSO
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KenAli
MRSO - Implants and Devices - Module
5 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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