CT Registry Review System Operation & Components Flashcards
X-RAYS ARE DIRECTED INTO A LOCALIZED SECTION OF THE PATIENT.
TRUE
WHAT IS CT?
A DIAGNOSTIC IMAGING MODALITY WHICH USES X-RAYS TO IMAGE INDIVIDUALS CROSS-SECTIONAL SLICES THROUGH THE BODY
X-RAYS THAT COMPLETELY PENETRATE THE PATIENT ARE DETECTED
TRUE
THE DETECTED SIGNALS ARE CONSTRUCTED INTO AN IMAGE
TRUE
DAC STANDS FOR?
DIGITAL TO ANALOG CONVERTER
THE SCAN CONTROLLER IS RESPONSIBLE FOR?
TIMING AND OPERATION OF PATIENT TABLE, GANTRY AND HIGH VOLTAGE GENERATOR
THE SIGNALS SENT TO THESE COMPONENTS MUST BE CONVERTED INTO________.
AN ANALOG OR CONTINUOUS WAVEFORM
THE HIGH VOLTAGE GENERATOR IS NECESSARY TO PRODUCE THE HIGH VOLTAGE POTENTIAL THAT EXISTS BETWEEN THE____ AND ____ OF THE CT TUBE
CATHODE / ANODE
THE X-RAYS THAT PASS THROUGH THE PATIENT’S BODY ARE MEASURED BY?
DETECTOR ELEMENTS ATTACHED TO THE GANTRY OPPOSITE OF THE TUBE
THE TINY ELECTRICAL SIGNALS MUST PASS THROUGH WHAT TO INCREASE OR AMPLIFY THEIR STRENGTH?
AN AMPLIFIER
WHAT DOES S/H STAND FOR?
SAMPLE AND HOLD COMPONENT
THE AMPLIFIED SIGNALS ARE WHAT TYPE OF SIGNALS?
ANALOG
THE FIRST CT SYSTEM WAS COMMERCIALLY INTRODUCED IN WHAT YEAR?
1973
1ST GENERATION SCANNERS GENERATED A THIN, FOCUSED X-RAY BEAM CALLED A _______ THROUGH THE PATIENT TO A SINGLE DETECTOR.
“PENCIL BEAM”
SINCE THE SCAN TIMES WERE SO LONG IN 1ST GENERATION SCANNERS, THEY WERE ONLY USED TO SCAN _______
HEADS
HOW MANY DETECTORS DID A 1ST GENERATION SCANNER HAVE?
1
THE TUBE/DETECTOR ASSEMBLY MOVED ACROSS THE PATIENT THE ROTATED BY_____?
1 DEGREE
IT TOOK APPROXIMATELY ___ MINUTES TO COMPLETE A SCAN WITH A 1ST GENERATION SCANNER.
5
2ND GENERATION SCANNERS INCORPORATED AN X-RAY TUBE WITH GENERATED AN X-RAY BEAM THAT HAD A SHAPE LIKE?
AN OPENED PAPER FAN
REFERRED TO AS HAVING A “FAN BEAM GEOMETRY”
2ND GENERATION SCANNER COLLECTED DATA ____ TIMES FASTER THEN 1ST GENERATION SCANNER
10
THERE WERE APPROXIMATELY ____ DETECTORS ON 2ND GENERATION SCANNER COLLECTING DATA AND TOOK ABOUT ___ SECONDS PER IMAGE
30/20
2ND GENERATIONS SCANNERS COVERED AN ARC OF ____ DEGREES AT A ANGLE OF TYPICALLY ___ DEGREES AROUND THE PATIENT
180/5
WHAT ARE THE TWO MOST IMPORTANT FACTORS OF THE 2ND GENERATION SCANNERS?
FAN BEAM GEOMETRY AND THE INTRODUCTION OF THE DETECTOR ARRAY
3RD GENERATION SCANNERS WERE INTRODUCED IN WHAT YEAR?
1975
THE ADVANCEMENT IN THE 3RD GENERATION SCANNER IS IN THE DETECTOR ARRAY WHICH IS ARRANGED IN A _______, RATHER THAN IN A STRAIGHT LINE AS THE 2ND GENERATION SYSTEMS.
CURVED ARC
3RD GENERATION SCANNERS THE X-RAY TUBE GENERATES X-RAYS WITH FAN BEAM GEOMETRY ADN THE DETECTOR ARRAY ROTATES WITH THE TUBE IN THE TUBE/DETECTOR ASSEMBLY IN THE GANTRY
TRUE
Most scanners available today are based on _______ generation technology
third
4th Generation Scanners have fan beam, multiple detectors that encircle the patient and do not rotate. Only the tube rotates around the patient.
TRUE
MOST CONTINUOUS SCANNERS USE _________TECHNOLOGY
SLIP RING
THE _______IS A LARGE, ROTATING RING WHICH SURROUNDS THE GANTRY APERTURE AND WHICH ELIMINATES THE WINDING UP OF THE HIGH-TENSION CABLE FROM THE HIGH FREQUENCY GENERATOR
SLIP RING
THE SLIP RING TRANSFERS:_______,________,_______ BETWEEN STATIONARY COMPONENTS AND ROTATING GANTRY COMPONENTS.
1-ELECTRICAL POWER
2- SCANNING INSTRUCTIONS
3- DETECTED SIGNALS
BY LATE _____ ALL OF THE MAJOR MANUFACTURERS OFFERED MULTI-ROW DETECTOR SCANNERS.
1998
IN ORDER TO COLLECT MULTIPLE SLICES IN EACH ROTATION, THE CT SCANNERS MUST USE A VERY_____X-RAY BEAM AND HAVE MULTIPLE _______ DETECTOR ARRAYS
THICK
PARALLEL
OTHER NAMES FOR MULIT-ROW DETECTOR SCANNERS ARE:
MDCT
MUTLI-SLICE SCANNERS
MSCT
MULTI-ARRAY SCANNERS
MULTI-ROW DETECTORS SCANNERS COLLECT INFORMATION FROM ________ANATOMICAL SLICES IN EACH ROTATION OF THE X-RAY TUBE.
MULTIPLE
MULTI-ROW DETECTOR SCANNERS HAVE MULTPLE, ______ DETECTOR ARRAYS THAT USE A THIRD GENERATION TYPE OF ARCHITECTURE
PARALLEL
TO DETERMINE THE ACQUIRED SECTION THICKNESS, THE ______ XRAY BEAM IS MEASURED BY THE MULTIPLE, PARALLEL DETECTOR ARRAYS, THE THICKNESS OF THE BEAM IS DIVIDED OVER THE TOTAL NUMBER OF ROWS OF DETECTOR.
TRUE
WHEN A THICK X-RAY BEAM IS USED, NOT ONLY DOES THE BEAM SPREAD OUT LIKE A FAN, BUT IT ALSO DIVERGES ALONG THE DIRECTION OF THE PATIENT TABLE LIKE A _______.
CONE
ANATOMY CAN BE SCANNED MORE QUICKLY ON MULTI-ROW DETECTOR SCANNERS THAN ON SINGLE ROW DETECTOR SCANNERS.
TRUE
EBCT STANDS FOR?
ELECTRON BEAM CT SCANNER
SINCE THERE ARE NO MOVING PARTS ON THE EBCT REQUIRED TO GENERATE, MOVE OR DETECT THE X-RAY BEN, IT IS AN EXTREMELY FAST SCANNER, COMPLETING A “ROTATION” IN APPROXIMATELY ____ TO ____ MILLISECONDS
50 TO 100
EBCT HAS VERY FAST SCAN TIMES MAKING IT SUITED FOR ______ AND ______ IMAGING
CARDIAC
CORONARY ARTERY
______ IMAGING S THE COMPARISON OF 2 IMAGING MODALITIES YIELDING CO-REGISTERED IMAGES
FUSION
