HISTOGRAM & IMAGE SAMPLING
NYQUIST THEOREM, ALIASING, & AUTOMATIC RESCALING
MODULATION TRANSFER FUNCTION & QUALITY CONTROL WORKSTATION FUNCTIONS
BASIC FUNCTIONS OF THE PROCESSING SYSTEM
Image Management
100
DATA COLLECTED WITHIN THE COLLIMATOR IS GRAPHICALLY REPRESENTED IN A _________.
What is A HISTOGRAM.
100
IS AUTOMATIC RESCALING A GOOD SUBSTITUTE FOR SETTING APPROPRIATE TECHNIQUES?
What is NO.
100
THE ABILITY OF A SYSTEM TO RECORD AVAILABLE SPATIAL FREQUENCIES_______.
What is MODULATION TRANSFER FUNCTION
100
____ CONTROLS HOW LIGHT OR DARK IMAGE IS.
What is WINDOW LEVEL
100
Information used to identify and retrieve exams. Examples include: patient name, exam date, health care facility, etc.
What is patient demographics?
200
A HISTOGRAM DISPLAYS THE USEFUL SIGNAL BY LOCATING _______ AND _______ SIGNALS.
What is MINIMUM AND MAXIMUM.
200
WHAT IS IT CALLED WHEN THE SAMPLING FREQUENCY IS GREATER THAN TWICE THE BANDWIDTH OF THE INPUT SIGNAL?
What is THE NYQUIST THEOREM.
200
A PERFECT SYSTEM FOR MTF RATIO OF IMAGE TO OBJECT IS ____.
What is 100% OR 1.
200
_____ CONTROLS RATIO OF BLACK TO WHITE, OR CONTRAST.
What is WINDOW WIDTH.
200
A function of PACS that allows retrieval of images based on patient demographics.
What is archive query?
300
THE ______ THE KILOVOLTAGE PEAK, THE NARROWER THE HISTOGRAM.
What is HIGHER.
300
WHAT OCCURS WHEN THE SAMPLING FREQUENCY IS NOT TWICE THE BANDWIDTH OF THE INPUT SIGNAL?
What is ALIASING.
300
THE SPREADING OF LIGHT REDUCES SYSTEM EFFICIENCY IN WHAT TYPE OF DETECTOR?
What is DIGITAL
300
_____ RESULTS IN TEMPORARY WHITE LIGHT BLINDNESS.
What is VEIL GLARE
300
The function of a QC workstation that allows other local workstations to receive images.
What is manual send?
400
THE SHAPE OF A HISTOGRAM IS SPECIFIC TO WHAT?
What is THE ANATOMY OF INTEREST.
400
WHAT IS THE FIRST NAME OF THE PERSON RESPONSIBLE FOR THE NYQUIST THEOREM.
What is HARRY.
400
WHAT DETECTORS ARE AFFECTED BY BOTH FOCAL SPOT & OID WITH SPATIAL FREQUENCY RESOLUTION?
What is FILM/SCREEN & DR
400
WHAT IS NOT USED TO MASK POOR COLLIMATION PRACTICES?
What is AUTOMATIC SHUTTERING
400
This should be recorded in the computer or scanned via barcode before the exam begins.
What is patient demographics?
500
IF TOO FEW PIXELS ARE SAMPLED, WHAT TYPE OF RESOLUTION WILL THE RESULTING IMAGE HAVE?
What is LOW RESOLUTION.
500
AUTOMATIC RESCALING IS WHEN AN IMAGE IS PRODUCED WITH WHAT?
What is UNIFORM SIZE AND SHAPE.
500
_______ OCCURS WHEN FEWER PIXELS IN THE NEIGHBORHOOD ARE INCLUDED IN THE SIGNAL AVERAGE.
What is EDGE ENHANCEMENT
500
ANOTHER TERM USED FOR BACKGROUND REMOVAL IS _____.
What is SHUTTERING
500
If this is not consistent across different exams and visits, it will be difficult or near impossible to merge the exams together.
What is the patient's name?
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