CAMRT /CAMRT-MRI ACTUAL
EXAM (2025) 100%VERIFIED
|complete QUESTIONS AND
ANSWERS | GRADED A+.
Is SNR proportional or inversely proportional to voxel volume - 🧠 ANSWER
✔✔Proportional
3 fields used in MRI - 🧠 ANSWER ✔✔-static magnetic field
-TVMF (gradient field)
-RF field
,3 main types of magnets used - 🧠 ANSWER ✔✔-Superconducting (most
common_
-Resistive
-Permanent
FDA limits for the 3 fields in MRI - 🧠 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 - 🧠 ANSWER ✔✔TVMF (gradients)
What are Eddy Currents - 🧠 ANSWER ✔✔Small currents induced in the
body via the TVMF
Biological effects of the TVMF - 🧠 ANSWER ✔✔-Fibrillation
,-Electroshock
-Visual phosphenes
-Peripheral nerve stimulation
SAR meaning and units - 🧠 ANSWER ✔✔Specific Absorption Rate
W/kg- Watts/kilogram
Which field is responsible for tissue heating and temperature increase - 🧠
ANSWER ✔✔The RF field
How are cardiac pacemakers affected in MRI - 🧠 ANSWER ✔✔Affected by
all 3 fields
-Static field affects the operation and also exerts torque
-TVMF and RF field can interfere with circuitry
3 types of ferromagnetic materials? - 🧠 ANSWER ✔✔iron, cobalt, nickel
Level 1 MR Personnel - 🧠 ANSWER ✔✔Passed MR safety education
requirements
COPYRIGHT©PROFFKERRYMARTIN 2025/2026. YEAR PUBLISHED 2026. COMPANY REGISTRATION NUMBER: 619652435. TERMS OF USE.
PRIVACY STATEMENT. ALL RIGHTS RESERVED
, Level 2 MR Personnel - 🧠 ANSWER ✔✔Those more extensively trained
and educated in MRI safety
How many times should a non emergent patient be screened - 🧠 ANSWER
✔✔Twice, once verbally with a level 2 MR Tech
How should emergent patients and their non MR personnel be screened - 🧠
ANSWER ✔✔Once
How should unconscious/ unresponsive patients be screened - 🧠 ANSWER
✔✔- A family member should fill out the screening form
-If no reliable history can be obtained and MR exam cannot wait they must
undergo plain film radiography of head/neck, chest, abdomen/pelvis, upper
arms and thighs
How should children and teens be screened - 🧠 ANSWER ✔✔Twice, once
in front of parents and once without
MRI and pregnant patients - 🧠 ANSWER ✔✔No known harmful effects but
risk vs benefit assessment should be made
MRI contrast and pregnant patients - 🧠 ANSWER ✔✔Should not be
routinely given to pregnant patients but risk vs benefit assessment needed
EXAM (2025) 100%VERIFIED
|complete QUESTIONS AND
ANSWERS | GRADED A+.
Is SNR proportional or inversely proportional to voxel volume - 🧠 ANSWER
✔✔Proportional
3 fields used in MRI - 🧠 ANSWER ✔✔-static magnetic field
-TVMF (gradient field)
-RF field
,3 main types of magnets used - 🧠 ANSWER ✔✔-Superconducting (most
common_
-Resistive
-Permanent
FDA limits for the 3 fields in MRI - 🧠 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 - 🧠 ANSWER ✔✔TVMF (gradients)
What are Eddy Currents - 🧠 ANSWER ✔✔Small currents induced in the
body via the TVMF
Biological effects of the TVMF - 🧠 ANSWER ✔✔-Fibrillation
,-Electroshock
-Visual phosphenes
-Peripheral nerve stimulation
SAR meaning and units - 🧠 ANSWER ✔✔Specific Absorption Rate
W/kg- Watts/kilogram
Which field is responsible for tissue heating and temperature increase - 🧠
ANSWER ✔✔The RF field
How are cardiac pacemakers affected in MRI - 🧠 ANSWER ✔✔Affected by
all 3 fields
-Static field affects the operation and also exerts torque
-TVMF and RF field can interfere with circuitry
3 types of ferromagnetic materials? - 🧠 ANSWER ✔✔iron, cobalt, nickel
Level 1 MR Personnel - 🧠 ANSWER ✔✔Passed MR safety education
requirements
COPYRIGHT©PROFFKERRYMARTIN 2025/2026. YEAR PUBLISHED 2026. COMPANY REGISTRATION NUMBER: 619652435. TERMS OF USE.
PRIVACY STATEMENT. ALL RIGHTS RESERVED
, Level 2 MR Personnel - 🧠 ANSWER ✔✔Those more extensively trained
and educated in MRI safety
How many times should a non emergent patient be screened - 🧠 ANSWER
✔✔Twice, once verbally with a level 2 MR Tech
How should emergent patients and their non MR personnel be screened - 🧠
ANSWER ✔✔Once
How should unconscious/ unresponsive patients be screened - 🧠 ANSWER
✔✔- A family member should fill out the screening form
-If no reliable history can be obtained and MR exam cannot wait they must
undergo plain film radiography of head/neck, chest, abdomen/pelvis, upper
arms and thighs
How should children and teens be screened - 🧠 ANSWER ✔✔Twice, once
in front of parents and once without
MRI and pregnant patients - 🧠 ANSWER ✔✔No known harmful effects but
risk vs benefit assessment should be made
MRI contrast and pregnant patients - 🧠 ANSWER ✔✔Should not be
routinely given to pregnant patients but risk vs benefit assessment needed
