CT Registry Review - System Operation & Components

CT Registry Review - System Operation & Components - Question Set 4

Questions 76-100

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

Select 5 key aspects of 4th generation CT systems.
1. Pencil Beam
2. Fan Beam
3. Curved detector array that rotates around the patient
4. Stationary detector array encircles the patient
5. Tube and curved detector array rotate around the patient in one direction only
6. Only the tube rotates around the patient
7. Scan times as low as 1 millisecond per image
8. Scan times of 1 second or faster per image
9. Detector elements nutate as the tube rotates around the patient
Why were continuous rotation scanners introduced?
1. To help keep the CT tube cool
2. As an alternative to EBCT (Electron Beam Computed Tomography)
3. To speed up the process of scanning
4. As an alternative to Slip-Ring technology
Why was slip ring technology such an improvement over existing technology? (select all that apply)
1. Because it reduced scan time
2. Because it eliminated the need to reverse the rotational direction of the gantry frame each rotation
3. Because it eliminated the windng up of the high tension cables
4. Because it made the process of getting a patient out of the gantry much faster and improved safety in general
What was the single most important advancement that led to the development of helical imaging?
1. The arrival of 4th generation technology
2. The introduction of slip-ring technology (Continuous Rotation Scanners)
3. The Cone beam reconstruction algorythm
4. Improvements in CT x-ray tube heat unit (HU) capacities
What is another name for helical imaging?
What is another name for conventional scanning?
Which came out first, continuous rotation scanners or MDCT (Multi Detector Computed Tomography) Technology?
1. Continuous Rotation Scanners
2. MDCT Scanners
3. They both came out at the same time
What does MDCT stand for?
What are other names for MDCT? (select all that apply)
1. Multi-Slice Scanners
2. Step-and-Shoot Scanners
3. MSCT
4. Multi-Array Scanners
What are the only two ways to cover anatomy faster in a helical study with a single row detector scanner?
1. Increase the slice thickness
2. Decrease the slice thickness
3. Increase the pitch
4. Decrease the pitch
What type of architecture do MDCT scanners have?
1. 1st Generation
2. 2nd Generation
3. 3rd Generation
4. 4th Generation
What three things listed below are transferred by the slip ring?
1. Audio signal
2. Electrical Power
3. Fiber Optics
4. Detected Signals
5. Scanning Instructions
6. Xenon Gas
7. Freeon
How many detectors are contained in a single detector array of a 3rd generation system?
1. Approximately 30 depending on manufacturer
2. Several hundred
3. Several thousand
4. Approximately 500,000 depending on manufacturer
What does EBCT stand for?
Select three benefits of MDCT Technology from the choices below.
1. Improved in-plane resolution
2. Faster scans
3. Improved z-axis resolution
4. Lower patient dose
5. Increased anatomical coverage
6. Simplified reconstruction algorythms
When was EBCT originally designed?
1. 1973
2. 1975
3. Mid 1980's
4. 1998
T/F: EBCT does not use an x-ray tube.
1. True
2. False
What is the fastest CT on the market?
1. 3rd Generation Scanners
2. 4th Generation Scanners
3. MDCT Scanners
4. EBCT Scanners
How long does one “rotation” take on an EBCT scanner?
1. 1 Second
2. Less than .2 seconds
3. Less than .02 seconds
4. 50 to 100 milliseconds
The speed of EBCT makes it the ideal scanner for doing what?
1. Imaging the Circle of Willis
2. Imaging the lungs for Pulmonary Emboli (PE)
3. Imaging the heart and coronary arteries
4. Trauma Imaging
What do we call the comparison of two imaging modalities yielding co-registered images?
What are the two most common modalities to fuse?
1. Ultrasound (US)
2. Magnet Resonance Imaging (MRI)
3. Computed Tomography (CT)
4. Nuclear Medicine (NM)
5. Positron Emition Tomography (PET)
What does PET stand for?
T/F: The radioactive pharmaceutical used in PET accumilates in tissues having higher rates of growth and metabolism after it is injected into the body.
1. True
2. False
T/F: Pet images are very sensitive to changes in metabolism associated with malignant tissues but have very poor resolution.
1. True
2. False