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MRSO Chapter 12 Questions & Correct Revised Verified Answers
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MRSO Chapter 12 Questions & Correct Revised Verified Answers
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MRSO Chapter 12 Questions &Correct Revised Verified Answers
How do you calculate energy disposition of an implant? - Answer Max SAR for
example: 2W/kg x .001 (this is the SAR from the distance of the implant from
isocenter)= .002 W/kg
what is the SAR limit on normal mode? - Answer 2 W/kg
The spine echo pulse sequence utilizes a 90 degree radiofrequency pulse, followed by a
one or more 180 degree refocusing pulses; the amount of heat deposited from a 180
degree refocusing pulse is __________times the amount as what is deposited by a 90
degree radiofrequency pulse. - Answer 4 times the amount
Pulse Sequences RESTORE or DRIVE pulse sequences utilize a what degree pulse
sequence? - Answer 270 degree RF pulse prior to the following repetition time
The echo planar imaging sequence has a better chance of what than burning the pt?
- Answer causing peripheral nerve damage
The time-varying gradient field poses the risk of induced current within the pt; This
is known as what? - Answer peripheral nerve stimulation
the time-varying gradient field changes the magnetic field in the order of what?
- Answer Kiloherts (kHz) which is not fast enough to induce heating
What can time-varying current do to muscles, nerves within the pt? - Answer
induce electrical current in muscles and nerves within the pt
What is the term at which the speed a gradient coil turns on and off? - Answer Slew rate
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