CT Registry Review - System Operation & Components -Question Set 2

CT Registry Review - System Operation & Components -Question Set 2

Questions 26-50

Choose the Correct answer for each question in the quiz!
References

When was the 1st CT System commercially introduced?
1. 1987
2. 1998
3. 1973
4. 1975
How many Generations of CT Systems are there?
1. Two
2. Five
3. Ten
4. Four
First Generation CT Systems generated a thin, focused x-ray beam called what?
1. Thin Fan Beam
2. Pencil Beam
3. Lazer Beam
4. Jim Beam
How many detectors were incorporated in the 1st Generation CT Systems?
1. one
2. two
3. three
4. four
The tube/detector configuration in a 1st Generation Scanner scanned across the patient’s body in a linear path before rotating and repeating. What is this called?
1. Interpalation
2. Translation
3. Forier Transmition
4. Acquisition
In a 1st generation scanner, what did you call the series of measurements that was collected as the tube/detector assembly translated across the patient?
1. An acquisition
2. A scan cycle
3. A flat scan
4. A projection
What is the 1st generation definition of a Projection?
1st Generation: What happens next after a complete translation from one side of the patient to the other?
1. The tube/detector assembly rotates about the patient 5 degrees and another translation commences so that another “Projection” can be measured.
2. The tube/detector assembly rotates about the patient 1 degree and another translation commences so that another “Projection” can be measured.
3. The tube/detector assembly rotates about the patient 1 degree and another translation commences so that another “Acquisition” can be measured.
4. The tube/detector assembly rotates about the patient 1 degree and another translation commences so that another “Acquisition” can be measured.
How many different projections were needed in a 1st generation system in order to construct and image?
1. 180
2. 360
3. 800
4. 1000
What was the shortest possible scan time per image with a 1st Generation system?
1. 1 min. per image
2. 5 min. per image
3. 10 min. per image
4. 20 min. per image
Since 1st generation scanners were so slow, imaging was limited to what part of the body?
1. Extremeties
2. Neck
3. Head
4. Chest
Why was CT imaging limited to the head in first generation scanners?
1. Because Computer technology at that time could not handle the incresed data calculations necissary.
2. Because x-ray tubes at that time could not handle the heat load necissary for larger body parts.
3. Because reconstruction algorythms for larger body parts had not yet been developed.
4. Because patient motion could be more easily controlled
Select four key aspects of 1st generation CT Scanners.
1. Fan beam
2. Pencil beam
3. More than one detector
4. One detector
5. Tube/detectors translated, rotated 1 degree and repeated
6. Tube/detectors translated, rotated 5 degrees and repeated
7. 1 min. per image
8. 5 min. per image
2nd generation CT Systems used an x-ray beam that had a shape similar to a/an ______ _____ ___.
2nd generation systems are referred to as having _________________ Geometry.
1. pencil beam
2. cone beam
3. lazer beam
4. fan beam
2nd generation CT Systems contain a/an _______ of detectors referred to as a/an ___________________.
1. bank / Data Acquisition System
2. group / detector array
3. selection / photo multiplier
4. number / flat pannel
About how many detectors comprised the detector array in 2nd generation scanners?
1. About 30
2. About 100
3. About 250
4. About 750
What was the purpose of the added detectors (detector array) and the fan beam geometry in the 2nd generation design?
1. To improve spatial resolution
2. To reduce radiation dose to the patient
3. To reduce the amount of time required to collect data
4. To eliminate artifact produced by pencil beam geometry
How much faster could a 2nd generation scanner collect the required data compared to a 1st generation scanner?
1. Twice as fast
2. Five times faster
3. Ten times faster
4. Onehundred times faster
T/F: In regards to 2nd generation CT Systems, the tube/detector assembly still translated across the patient during the collection of a “projection” of data.
1. True
2. False
After a “projection” of data is obtained in a 2nd generation CT System, the tube/detector rotates typically ____________ covering an arc of __________ around the patient.
1. 5 degrees or more / 180 degrees
2. 5 degrees or more, 360 degrees
3. 10 degrees or more, 180 degrees
4. 10 degrees or more, 360 degrees
What was the scan time for a single image in a 2nd generation scanner?
1. Approximately 5 seconds
2. Approximately 20 seconds
3. Approximately 60 seconds
4. Approximately 5 min.
What single aspect of 2nd generation scanners led to applications outside the head?
1. "Fan Beam" geometry
2. Increased number of detectors
3. Reduced scan time
4. Improved algorithms
What were the 2 most important features of 2nd generation scanners which quickly made 1st generation systems obsolete?
1. "Pencil Beam" geometry
2. "Fan Beam" geometry
3. Improved algorythms
4. The detector array
Select the four key aspects of 2nd generation CT Systems.
1. "Pencil Beam"
2. "Fan Beam"
3. "Cone Beam"
4. One detector
5. Multiple detectors in a straight line
6. Approx 5 min. per image
7. Approx 20 seconds per image
8. Tube/Detector moved across the patient then rotated by approx. 5°
9. Tube/Detector moved across the patient then rotated by approx. 1°