MRI PHYSICS
WHAT DOES 'MRI' STAND FOR
MAGNETIC RESONANCE IMAGING
TRUE OF FALSE: ALL PATIENTS CAN HAVE AN MRI WITHOUT SCREENING
FALSE
WHICH IMAGING PLAN DIVIDES THE BODY INTO LEFT AND RIGHT SECTIONS?
SAGITTAL PLAN
TRUE OR FALSE: T1 WEIGHTED IMAGES MAKE FAT APPEAR BRIGHT
TRUE
WHAT IS THE FIRST STEP BEFORE POSITIONING A PATIENT ON THE MRI TABLE
SCREENING THE PATIENT
WHAT PROPERTY OF HYDROGEN PROTONS MAKES THEM IDEAL FOR MRI IMAGING?
ABUNDANT IN THE BODY AND HAVE A MAGNETIC MOMENT
WHAT IS THE TERM FOR THE AREA AROUND MRI MAGNET WHERE THE MAGNETIC FILED IS STRONG ENOUGH TO AFFECT FERROMAGNETIC OBJECTS?
THE FRINGE FIELD
NAME ON STRUCTURE VISIBLE IN A BRAIN MRI T1 WEIGHTED IMAGE
-CEREBRAL CORTEX
- VENTRICLES
-CORPUS CALLOSUM
WHICH SEQUENCE IS BEST FOR DETECTING ACUTE BLEEDING: T1, T2, OR GRE?
GRE (GRADIENT ECHO)
WHICH COIL IS COMMONLY USED FOR KNEE MRI?
DEDICATED KNEE COIL
WHAT IS THE UNIT USED TO MEASURE MAGNETIC FIELD STRENGTH?
TESLA
NAME ONE TYPE OF IMPLANT THAT IS OBSOLUTELY CONTRAINDICATED IN MRI
- FEROMAGNETIC ANEURYSM CLIP
WHAT IS THE LARGE MUSCLE IN THE FRONT OF THE THIGH CALLED?
QUADRICEPS FEMORIS
WHAT DOES FSE STAND FOR?
FAST SPIN ECHO
WHAT IS THE PURPOSE OF CENTERING THE LASER LIGHT ON A SPECIFIC LANDMARK?
TO ENSURE ACCURATE POSITIONING AND SLICE PLANNING
EXCITE HYRDROGEN PROTONS, TIPPING THEM INTO THE TRANSVERSE PLANE
WHAT IS THE PURPOSE OF THE QUENCH PIPE IN A MRI SYSTEM?
TO SAFELY VENT HELIUM GAS OUTSIDE IN CASE OF A QUENCH
IN A LUMBAR SPINE MRI, WHICH VETEBRA IS LABELED "L5"?
THE 5TH LUMBAR VERTABRA AT THE BASE OF THE SPINE
WHAT PARAMETER CONTROLS THE TIME BETWEEN THE APPLICATION OR TWO CONSECUTIVE RF PULSES?
REPETITION TIME (TR)
HOW CAN MOTION ARTIFACTS BE REDUCED DURING SCANNING?
INSTRUCT PATIENT TO STAY STILL, USE FASTER SEQUENCES, OR MOTION CORRECTION TECHNIQUES
EXPLAIN THE DIFFERENCE BETWEEN T1 AND T2 RELAXATION TIMES
T1-LONGITUDINAL RELAXATION (REALIGNMENT WITH B0)
T2- TRANSVERSE RELAXATION (LOSS OF PHASE COHERENCE)
WHAT TYPE OF SAFETY ZONE IS THE MRI SCANNER ROOM ACCORDING TO ACR GUIDELINES?
ZONE IV
WHICH CRANIAL NERVE IS ASSOCIATED WITH HEARING AND BALANCE?
CRANIAL NERVE VIII (VESTIBULOCOCHLEAR NERVE)
WHAT TYPE OF SEQUENCE IS USED TO SUPPRESS THE SIGNAL FROM FLUID?
FLAIR (FLUID ATTENUATED INVERSION RECOVERY)
WHAT DOES SHIMMING DO IN MRI?
ADJUSTS THE HOMOGENEITY OF THE MAGNETIC FIELD FOR BETTER IMAGE QUALITY