CT PHYSICS BASICS
WHAT DOES CT STAND FOR?
COMPUTED TOMOGRAPHY
WHAT DOES ALARA STAND FOR?
AS LOW AS REASONABLY ACHIEVABLE
WHICH PLANE DIVIDES THE BODY INTO TOP AND BOTTOM PARTS?
AXIAL PLANE
WHAT CONTRAST IS USED MOST IN ABDOMINAL CT EXAMS?
IODINATED CONTRAST
WHAT IS THE FIRST STEP BEFORE PERFORMING A CT SCAN?
VERIFY PATIENT IDENTITY AND ORDER
WHAT IS THE UNIT OF X-RAY ATTENUATION USED IN CT?
HOUNSFIELD UNIT (HU)
WHICH TYPE OF SHIELDING IS COMMONLY USED TO PROTECT PATIENTS?
LEAD SHIELDING
WHICH ORGAN IS LOCATED IN THE RIGH UPPER QUADRANT?
LIVER
TRUE OF FALSE: DELAYED PHASE IMAGING IS USED FOR KIDNEY EVALUATION
TRUE
WHAT IS THE PURPOSE OF A SCOUT IMAGE?
PLANNING THE SCAN RANGE
WHAT DOES THE CT GANTRY HOUSE?
X-RAY TUBE AND DETECTORS
WHAT IS THE TYPICAL UNIT OF MEASURING RADIATION DOSE IN CT?
MILLISIEVERTS (mSv)
WHAT STRUCTURE CARRIES URINE FROM THE KIDNEY TO THE BLADDER?
URETER
WHAT DOES mAs CONTROL IN CT
QUANTITY OF X-RAY PHOTONS (DOSE AND NOISE)
WHICH VEIN IS COMMONLY USED FOR CONTRAST INJECTION?
ANTECUBITAL VEIN
WHAT IS THE TYPICAL RANGE OF HU FOR WATER?
0 HU
WHICH FACTOR INCREASES DOSE: HIGHER kVp OR LOWER kVp?
HIGHER kVp INCREASES DOSE
WHICH BONE FORMS THE FOREHEAD?
FRONTAL BONE
WHAT IS THE TYPICAL SLICE THICKNESS FOR HEAD CT?
5MM
WHAT IS BOLUS TRACKING USED FOR?
TO TIME CONTRAST-ENHANCED SCANS
WHAT IS THE PITCH IN CT SCANNING?
THE TABLE TRAVEL PER ROTATION DIVIDED BY BEAM WIDTH
NAME ONE METHOD TO REDUCE PATIENT DOSE IN CT
AUTOMATIC EXPOSURE CONTROL
LOWER mAs
OPTIMIZED PROTOCOLS
WHICH VESSEL IS THE MAIN ARTERY LEAVING THE HEART?
AORTA
WHAT DOES RECONSTRUCTION ALGORITHM DETERMINE?
IMAGE SHAPRNESS VS. NOISE BALANCE
WHAT SHOULD BE DONE IF A PATIENT SHOWS SIGNS OF ALLERGIC REACTION?
STOP INJECTION
CALL RAPID/ALERT PHYSICIAN
FOLLOW EMERGENCY PROTOCOL