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MRI CAMRT Exam Questions With Complete Solution

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MRI CAMRT Exam Questions With Complete Solution Is SNR proportional or inversely proportional to voxel volume -Correct Answer-Proportional 3 fields used in MRI -Correct Answer--static magnetic field -TVMF (gradient field) -RF field 3 main types of magnets used -Correct Answer--Superconducting (most common_ -Resistive -Permanent FDA limits for the 3 fields in MRI -Correct Answer-Static field: 2T TVMF: 3T/s RF field: - does not cause an increase in temperature of more than .5 deg C or any body part of 1 deg C -SAR does not exceed 1W/kg avg over 25% of whole body for longer than 15mins -SAR does not exceed 2W/kg avg over 25% of whole body for durations of 15mins or less Eddy currents are caused by -Correct Answer-TVMF (gradients) What are Eddy Currents -Correct Answer-Small currents induced in the body via the TVMF Biological effects of the TVMF -Correct Answer--Fibrillation -Electroshock -Visual phosphenes -Peripheral nerve stimulation SAR meaning and units -Correct Answer-Specific Absorption Rate W/kg- Watts/kilogram Which field is responsible for tissue heating and temperature increase -Correct Answer-The RF field How are cardia

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MRI CAMRT
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MRI CAMRT

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Uploaded on
May 21, 2024
Number of pages
21
Written in
2023/2024
Type
Exam (elaborations)
Contains
Questions & answers

Subjects

  • is snr proportional or inversely proportional to v
  • 3 main types of magnets used
  • fda limits for the 3 fields in mri
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